Testing device for acoustic signal transmitters, especially those of fire alarm systems

Abstract

Test device (1) for the functional testing, in particular in accordance with standards and / or standardization, of an acoustic signal generator (2), in particular an acoustic signal generator (2) of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator (2), wherein the test device (1) comprises: - a reverberation chamber (3), in particular a box-shaped reverberation chamber, in particular wherein the reverberation chamber (3) comprises a plurality of chamber walls (4), in particular six chamber walls (4), and / or is composed of a plurality of chamber walls (4), in particular six chamber walls (4), preferably wherein the reverberation chamber (3) is bounded and / or formed by the chamber walls (4), - a device arranged in the reverberation chamber (3),preferably pivotably and / or rotatably mounted and / or attached, microphone (5) for detecting and / or recording an acoustic signal (warning signal) generated by the acoustic signal generator (2), in particular for detecting and / or recording a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator (2), in particular wherein the microphone (5) is arranged and / or attached and / or mounted on a chamber wall (4) of the reverberation chamber (3) by means of a microphone holding device (6), in particular pivotably and / or rotatably, - a test specimen holder (7) arranged in the reverberation chamber (3) for holding and / or receiving an acoustic signal generator (test specimen) (2) to be tested, in particular wherein the test specimen holder (7) is attached to a chamber wall (4), preferably to a chamber wall (4) opposite the microphone (5),preferably arranged and / or attached to one of the chamber walls (4) opposite the microphone holding device (6) for the microphone (5); wherein at least one ventilation opening (8A, 8B), preferably a perforation, is arranged and / or provided on and / or in at least one chamber wall (4), in particular for the preferably defined and / or predetermined inlet and / or outlet of air, preferably test atmosphere, into and / or out of the reverberation chamber (3) and / or in particular for the preferably defined and / or predetermined setting of environmental stress conditions in the reverberation chamber (3).

Description

The present invention relates to the technical field of testing and / or evaluating acoustic signaling devices, in particular acoustic signaling devices of fire alarm systems, preferably for testing and / or evaluating acoustic signaling devices, in particular of fire alarm systems, in a manner that complies with standards and / or is standardized, by measuring and / or evaluating a sound pressure level of the acoustic signaling devices. In particular, the present invention relates to a test device for the functional testing of an acoustic signal generator, in particular an acoustic signal generator of a fire alarm system, in particular a test device for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator. Furthermore, the present invention also relates to the use of the test device according to the present invention in a method for the functional testing of an acoustic signal generator, in particular an acoustic signal generator of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator. Furthermore, the present invention also relates to the use of a test device according to the present invention for the functional testing of an acoustic signal generator, in particular an acoustic signal generator of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator. Finally, the present invention also relates to the use of a reverberation chamber for the functional testing of an acoustic signal generator, in particular an acoustic signal generator of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator. Fire alarm systems – hereinafter also referred to as "FAS" – are hazard detection systems used in preventive fire protection. They include a fire alarm control panel as a central component to receive and evaluate events from the various fire detectors within the FAS and to initiate responses, such as forwarding fire and fault messages to a control center to alert the local fire department or the responsible security service. Alternatively, internal alarms can also be triggered, particularly for preliminary checks to determine whether a false alarm has occurred, or for subsequent alerts for the purposes of evacuating buildings, opening smoke extraction systems, controlling elevators, closing fire doors, activating a building extinguishing system, such as a CO2 extinguishing system, etc. To detect fires, fire alarm systems can use various fire detectors (such as smoke, temperature, flames, etc.) that are calibrated or adapted to different parameters. The activation of a fire extinguishing system can also be used as a signal to detect a fire. Fire alarm systems are installed particularly in vulnerable or high-risk buildings, such as airports, train stations, universities, schools, office buildings, factories, retirement homes, hospitals, public buildings, and similar structures. The requirement to install fire alarm systems that communicate directly with local fire departments is regulated by building codes within the framework of special building regulations. For example, in Germany, the requirements of DIN 14675 are generally used for the planning and implementation of fire alarm systems. Systems accepted by building insurance companies must meet the requirements of the VdS guideline VdS 2095. Detailed specifications and mandatory functional requirements for the overall design and components of the fire alarm system are defined in the relevant regulations. The primary purpose of fire alarm systems is to detect fires early, regardless of whether anyone is present, and to automatically initiate appropriate measures. The signal from such a fire alarm system should reach all persons in or immediately adjacent to the building at risk, enabling the entire building to be evacuated quickly and safely, and allowing a fire to be extinguished or suppressed, potentially even in its initial stages. Therefore, the purpose of an audible alarm is to warn people in or near a building of a fire by means of a fire alarm signal. The European standard DIN EN 54-3 (current version: DIN EN 54-3: 2019-11) acknowledges and requires that the precise requirements for acoustic fire alarm signals differ, particularly with regard to the frequency range, the temporal shape or output level, the type of installation, the existing risk type, the corresponding measures to be taken, the emergency alarm signal (see, for example, EN ISO 7731), as well as national differences or circumstances, i.e., safety standards. The resulting standard therefore contains a fundamentally suitable and standardized procedure for testing the operational suitability of acoustic signaling devices based on the manufacturers' specifications, but not a list of general requirements. In some European countries, specific sound frequencies and sound waveforms are used. These may also be specified in national regulations or standards (see also Annex D to DIN EN 54-3). Attention is drawn to national safety regulations, which may define the maximum sound pressure level safe for building occupants. In this context, the international standard ISO 8201:87 “Acoustics-Audible emergency evacuation signal” should also be noted, in which the temporal patterns and the required sound pressure levels for acoustic emergency evacuation signals have been defined. The European standard DIN EN 54-3 specifies general requirements for acoustic signaling devices and their performance under climatic, mechanical, and electrical disturbance conditions that may occur in the operating environment. This European standard DIN EN 54-3 covers acoustic signaling devices for either indoor or outdoor use. In fire alarm systems, acoustic voice alarm devices are used as alarm systems to warn people inside a building in the event of a fire, employing a combination of warning signals and targeted voice announcements. The requirements, test methods, and performance criteria for acoustic signaling devices specified in the standard DIN EN 54-3 also apply to acoustic voice alarm devices. Additional requirements, test methods, and performance criteria specifically for acoustic voice alarm devices are also included in the relevant standard DIN EN 54-3. In fire alarm systems, acoustic signaling devices are therefore an essential component of the alarm system. They serve to alert people in or near a building to a fire or other hazardous situation. These signaling devices often need to be particularly loud and / or clearly audible to ensure that the alarm is heard even in large and / or noisy environments. Various types of acoustic signaling devices are used in fire alarm systems, such as sirens, horns or buzzers, combination acoustic-visual signaling devices, warning tones of varying frequencies, etc. As previously stated, acoustic signaling devices in fire alarm systems must comply with certain regulations and standards, as specified in particular in DIN EN 54-3, which defines the requirements for acoustic signaling devices for fire alarm systems. These include, among other things, that the volume must be sufficient to be heard even in noisy environments and that the sound must be clearly recognizable as a warning signal. For a reliable warning function and suitability of such acoustic signaling devices, it is essential that these devices can continue to function even during and after exposure to relevant environmental stresses. Such environmental stresses are further specified in DIN EN 54-3 and relate, for example, to various climatic requirements or stresses, such as humidity, temperature stresses like cold or heat, etc., but also other environmental stresses such as corrosion resistance, etc. For the purpose of conducting tests under environmental conditions that are as practical and realistic as possible, the DIN EN 54-3 standard in question prescribes the testing of the acoustic signal transmitter to be tested in a so-called reverberation chamber, in particular a reverberation test chamber. A "reverberation chamber" or "reverberation test chamber" is a specially designed room used to test or measure the sound of acoustic systems. In the reverberation chamber, especially the reverberation test chamber, the acoustic signals of acoustic signaling devices of fire alarm systems can be checked under controlled conditions, and various parameters can be measured for this purpose, such as the volume (sound pressure level), the frequency range and sound characteristics, the directness of the signal transmission, interference and distortion, etc. In order to implement the relevant environmental stress according to DIN EN 54-3 in accordance with the state of the art, i.e., to expose the acoustic signal transmitter to be tested to defined climatic conditions, such as temperatures and / or relative humidity, the relevant exposure of the reverberation chamber, in particular the reverberation test chamber, to the relevant environmental stress must be carried out accordingly.The relevant environmental stress conditions must be implemented by placing the entire reverberation chamber in a complex manner, particularly by inserting it into an air-conditioned chamber, and / or by first opening it there under the relevant environmental stress conditions by the personnel performing the test. This is necessary to apply and transfer the environmental stress conditions specified in DIN EN 54-3 to the reverberation chamber and the test specimen within it, while the chamber must then be closed again by the personnel for the actual measurement. Therefore, comparative sound pressure level measurements require multiple manual openings and closings of the reverberation chamber, repeatedly exposing the personnel performing the test to the specified environmental stress conditions. This is usually done because the sometimes massive or heavy side panels of the box-shaped Hall test chamber have to be removed or opened to allow access to the interior of the chamber, particularly with the aim of subjecting the interior of the chamber and the test specimen inside it to the environmental stress conditions to be set (e.g. cold or heat, humidity, corrosive conditions, etc.) and carrying out measurements, whereby the persons carrying out the test are exposed to the potentially very challenging environmental stress conditions for at least a certain period of time. A significant disadvantage of the testing devices used according to the state of the art for testing acoustic signaling devices of fire alarm systems according to DIN EN 54-3, in particular Hall effect test chambers, is that environmental stresses can only be implemented with considerable effort, especially in view of the occupational safety conditions that are difficult to comply with in this context with regard to the persons who carry out the test. For example, the persons who have to carry out the test with the state-of-the-art test equipment or reverberation chambers are often exposed to the relevant environmental stresses for a long time or, in extreme cases, even permanently, since they have to enter the climate-controlled room containing the test equipment, in particular the reverberation test chamber, for the purpose of adjusting the environmental stress conditions or opening the test equipment, in particular the reverberation test chamber (e.g., to remove the side walls of the test chamber, to apply the relevant environmental stress conditions, etc.). The above shortcomings and problems are all the more significant because acoustic testing, especially sound pressure level testing, is subject to a comparatively high sensitivity and even minor deviations can have a considerable impact on the measurement and test quality, particularly with the consequence that a standard-compliant or standardized and reproducible test is no longer possible or only possible to a limited extent. Against this background, there is an increased need in practice for testing concepts, in particular testing devices or testing procedures, which enable standard-compliant or standardized testing of acoustic signaling devices, especially acoustic signaling devices of fire alarm systems, in particular in accordance with the requirements of and / or in accordance with DIN EN 54-3, but are easy to implement and also meet the requirements of occupational health and safety. EP 1 798 699 A1 relates to a fire alarm device with a self-testing device for functional testing of the fire alarm device. The self-testing device comprises test equipment for generating test signals, a processor configured for performing the self-test, and a memory in which the results of the self-test can be stored. A transmitter is provided to send the results of the self-test to a receiver. However, this design lacks a generally applicable concept for testing acoustic signaling devices of fire alarms in general. Furthermore, the self-testing device does not meet the requirements of a standardized functional test, particularly not under the conditions of DIN EN 54-3. DE 10 2012 215 212 A1 relates to a fire alarm device for detecting and reporting a fire, comprising a sensor and a measuring range, wherein the sensor is designed to detect the fire based on a fire-specific environmental parameter in the measuring range, wherein the sensor is designed to output sensor signals based on the fire-specific environmental parameter, comprising a test unit designed to output a test gas into the measuring range, wherein the test gas simulates the fire-specific environmental parameter in the measuring range, comprising an evaluation unit designed to evaluate the sensor signals as measured values, wherein the evaluation unit is designed to evaluate the measured values ​​as a measured value trend over a defined period and thereby verify the functionality of the fire alarm device.This is also merely a self-test in the sense of an intrinsic functional test and not a generally applicable concept for conducting tests on acoustic signaling devices of fire alarm systems. In particular, the intended function does not meet the requirements of a standard-compliant or standardized functional test, especially not under the conditions of DIN EN 54-3. Against this background, there is therefore an increased need in practice for testing concepts or testing procedures that allow for a standard-compliant or standardized functional test of a signal transmitter, in particular according to the requirements of and / or in accordance with DIN EN 54-3, and also take into account the requirements of occupational health and safety. In particular, one object of the present invention is therefore to provide a technically efficient solution for a comprehensive testing concept (i.e., testing device and its use in a testing procedure) with which the disadvantages of the prior art or from practice described above are to be avoided as far as possible or at least mitigated. In particular, the present invention is based on the objective of providing a test concept (i.e., test device and its use in a test procedure) that can be implemented in particular in accordance with DIN EN 54-3 for the preferably standard-compliant or standardized functional testing of (acoustic) signal transmitters, especially of fire alarm systems, which enables a particularly practical or user-friendly and at the same time reproducible, preferably standard-compliant and / or standardized functional testing of signal transmitters. In this context, a particular object of the present invention is to provide a test device and its use in a corresponding test procedure, enabling a particularly practical and user-friendly, yet reliable and reproducible, and especially standard-compliant and / or standardized, functional test of (acoustic) signaling devices, particularly those of fire alarm systems, preferably for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3. In particular, the disadvantages of the prior art and practical experience described above should at least be largely avoided or mitigated. In a completely unexpected manner, the applicant has now found that, based on the inventive concept underlying the present invention – and in particular on the basis of a test device for the standard-compliant and / or standardized functional testing of a signal transmitter and a test procedure adapted to it, as well as uses adapted to it – a reliable or reproducible, in particular standard-compliant and / or standardized testing of signal transmitters is made possible, which also enables a simplified implementation while at least partially avoiding the disadvantages of the prior art and, moreover, takes into account the requirements of occupational health and safety. To solve the problem described above, the present invention proposes – according to a first and / or second aspect of the present invention – a test device for the functional testing, in particular in accordance with standards and / or in accordance with DIN EN 54-3, of an acoustic signal generator, especially an acoustic signal generator of a fire alarm system, and in particular for conformity testing according to the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator, according to claim 1 and the relevant independent claims. Advantageous further developments and embodiments of this aspect of the invention are the subject of the corresponding dependent claims. The test device according to the present invention is particularly suitable for use in a test procedure for the functional testing of an acoustic signal generator, especially an acoustic signal generator of a fire alarm system, in particular for conformity testing according to the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating the sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator. Advantageous further developments and embodiments of this aspect of the invention are described below. A further subject matter of the present invention – according to a third aspect of the present invention – is the use of a test device according to the invention for the functional testing, in particular in accordance with standards and / or standardization, of an acoustic signal generator, especially an acoustic signal generator of a fire alarm system, and in particular for conformity testing according to the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator, according to the independent use patent claim relating to this use. Advantageous further developments and embodiments of this aspect of the invention are the subject of the corresponding use claims. Finally, according to a fourth aspect of the present invention, the subject matter is the use of a reverberation chamber for the functional testing of an acoustic signal generator, particularly an acoustic signal generator of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, especially by measuring and / or evaluating the sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator, according to the independent use patent claim relating to this use. Advantageous further developments and embodiments of this aspect of the invention are the subject of the corresponding use claims. It goes without saying that any embodiments, designs, advantages and the like, which are listed below for the purpose of avoiding repetition only with regard to one aspect of the invention, naturally also apply to the other aspects of the invention without the need for separate mention. Furthermore, it goes without saying that the following specifications of values, numbers and ranges are not to be understood as limiting; it is self-evident to the person skilled in the art that deviations from the specified range or specifications are possible in individual cases or depending on the application, without leaving the scope of the present invention. Furthermore, it should be noted that all values ​​or parameters mentioned below, or the like, can generally be determined using standardized or explicitly specified determination methods, or using determination methods that are generally familiar to those skilled in the field. Furthermore, for the purposes of describing the present invention, the features of the present invention cited in connection with specific embodiments, configurations, advantages, examples, or the like are also considered disclosed in combination. Thus, higher-order combinations of individual or multiple features cited for specific embodiments, configurations, application examples, or the like are also considered disclosed. In particular, with regard to the features characterizing the invention, all possible combinations of these features shall be deemed disclosed, with embodiments of comparable or corresponding preference of the various features in their combination being preferred (e.g. quantities or quantity ranges of the relevant parameters of the same preference or the like). It is particularly important to note that for the following information relating to the various parameters of the test device or test method or uses according to the invention, where the same preference or level of preference is given, the respective combinations relating to the various parameters with the corresponding preference or level of preference are also disclosed. Likewise, all other combinations (i.e., combinations based on different preferences or levels of preference) are also disclosed. Having said that, the invention will now be described and explained in more detail, also with reference to drawings or figures illustrating preferred embodiments or exemplary embodiments. The subject matter of the present invention – according to a first aspect of the present invention – is thus a test device for the functional testing, in particular in accordance with standards and / or standardization, of an acoustic signal generator, in particular an acoustic signal generator of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator, wherein the test device comprises: - a reverberation chamber, in particular a box-shaped reverberation test chamber, in particular wherein the reverberation chamber has a plurality of chamber walls, in particular six chamber walls, and / or is composed of a plurality of chamber walls, in particular six chamber walls, preferably wherein the reverberation chamber is bounded and / or formed by the chamber walls.- a microphone arranged in the reverberation chamber, preferably pivotably and / or rotatably mounted and / or attached, for detecting and / or recording an acoustic signal (warning signal) generated by the acoustic signal generator, in particular for detecting and / or recording a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator, in particular wherein the microphone is arranged and / or attached and / or mounted on a chamber wall of the reverberation chamber, preferably by means of a microphone holding device, in particular pivotably and / or rotatably, - a test specimen holder arranged in the reverberation chamber for holding and / or receiving an acoustic signal generator (test specimen) to be tested, in particular wherein the test specimen holder is attached to a chamber wall, preferably to a chamber wall opposite the microphone, preferably to a chamber wall opposite the microphone holding device for the microphone,is arranged and / or attached; wherein at least one ventilation opening, preferably a perforation, is arranged and / or formed and / or provided on and / or in at least one chamber wall, in particular for the preferably defined and / or predetermined inlet and / or outlet of air, preferably test atmosphere, into and / or out of the reverberation chamber and / or in particular for the preferably defined and / or predetermined setting of environmental stress conditions in the reverberation chamber. The test device according to the invention thus comprises a reverberation chamber, in particular a reverberation test chamber, in particular wherein the reverberation chamber has a plurality of chamber walls, in particular six chamber walls, or is formed thereof or is bounded by them. In particular, a microphone is provided on at least one, preferably exactly one, chamber wall, preferably wherein this microphone is pivotably and / or rotatably mounted or attached; the microphone detects and / or records an acoustic signal (warning signal) generated by the acoustic signal generator, in particular wherein an acoustic signal generated by the acoustic signal generator is detected and / or recorded. The design provides that the microphone is arranged and / or attached and / or mounted on an associated chamber wall of the reverberation chamber, preferably by means of a microphone holding device, in particular in a swiveling and / or rotatable manner. Constructively, a test specimen holder is provided, particularly opposite the microphone (preferably on an opposite wall of the reverberation chamber), for holding and / or receiving the acoustic signal generator or test specimen under test. The term "test specimen holder" is to be understood broadly and also includes a preferably planar holding section within the reverberation chamber or on an associated chamber wall, on which the signal generator or test specimen can be arranged or held. In a particularly preferred embodiment, the test specimen holder is arranged and / or attached to a chamber wall, specifically to a chamber wall opposite the microphone or microphone holding device. The test device according to the invention has at least one ventilation opening, preferably a perforation, on and / or in at least one chamber wall, in particular for the preferably defined and / or predetermined inlet and / or outlet of air, preferably test atmosphere, into and / or out of the reverberation chamber, in particular for the preferably defined and / or predetermined setting of environmental stress conditions in the reverberation chamber. The shape of the ventilation opening is ultimately freely selectable. A central idea of ​​the present invention is therefore to provide at least one ventilation opening, preferably in the form of a perforation, in or on at least one chamber wall of a reverberation chamber for the purpose of testing an acoustic signal generator. This allows for a defined or predetermined setting of environmental stress conditions in the reverberation chamber, accompanied by a standard-compliant or ultimately reproducible and therefore reliable evaluation and / or measurement of the acoustic signal emitted by the acoustic signal generator within the reverberation chamber. In contrast to the solution known from practice or the prior art, according to which removing, loosening, or opening at least one chamber wall is required to adjust the test atmosphere or environmental stress conditions in the reverberation chamber (which usually involves positioning or placing the entire reverberation chamber and test device in a defined climate-controlled environment, such as a climate chamber), the solution according to the invention achieves the adjustment via the ventilation opening formed in the chamber wall, without requiring any relocation, manipulation, or opening of the chamber wall itself. In other words, the preferably defined and / or adjustable flooding or...The reverberation chamber is set to the test atmosphere, in particular environmental stress conditions, exclusively via the ventilation opening in the chamber wall, which is designed as a perforation, without it being necessary to place the reverberation chamber or test device as a whole in a defined climate-controlled environment, such as a climate chamber, since the test atmosphere is already set via the ventilation opening. In this context, the applicant has – quite surprisingly – recognized that the introduction of the ventilation opening does not lead to a deviation from the standard in the functional test or the standard-compliant use of the test device, in particular leaving the acoustics of the reverberation test chamber at least essentially unaffected, especially if the ventilation opening is dimensioned to a defined size. In particular, and quite surprisingly, the introduction of the ventilation opening or perforations does not result in any effects that significantly impair the acoustic properties of the reverberation chamber. This is also completely unexpected, as the introduction of perforations in a reverberation chamber is physically and usually associated with an impairment of sound absorption or acoustic properties. Nevertheless, the applicant surprisingly discovered that, according to the invention, such an impairment does not occur, and consequently, the upper limit for sound absorption specified in DIN EN 54-3 is not exceeded. Therefore, the reverberation chamber, equipped with one or more ventilation openings, in particular perforations, remains practically available for carrying out the functional test in question. Consequently, departing from the previously established practice of manually repositioning or opening the chamber wall, it is now possible to adjust the test atmosphere and conditions, particularly environmental stress conditions, inside the reverberation chamber without requiring the person conducting the test to open it. Instead, adjustments can be made solely via the ventilation opening(s) while the chamber remains otherwise closed and sealed. This approach also ensures reliable compliance with occupational safety and health regulations, as the person performing the test no longer needs to be exposed to the test atmosphere or conditions, even temporarily.Furthermore, from the perspectives of occupational safety and health, the opening and closing of the sometimes very heavy and spatially bulky chamber walls of the reverberation chamber is eliminated. It is also possible to set time-varying test atmospheres or test conditions, especially more reliably and reproducibly than according to the state of the art (especially since checking the tightness or the tight seal of the reverberation chamber walls is equally unnecessary, as these remain in the closed state). In other words, the adjustment or implementation of the test atmosphere, particularly the environmental stress conditions, in the reverberation chamber can only be carried out via the ventilation opening(s) when the chamber is closed, so that a person commissioned with the test is not directly exposed to the test atmosphere introduced into the chamber. The test atmosphere is introduced into the interior of the reverberation chamber via the ventilation opening(s) or perforation(s) in the chamber wall, without requiring any further manual manipulation or manual opening of the chamber by the person commissioned with the test. The adjustment or exposure of the reverberation chamber to the test atmosphere or environmental stress conditions, including the test specimens, is preferably carried out exclusively via the ventilation opening(s), in particular by means of at least one air conveying device. A particularly advantageous method, for example, during functional testing, is to place the closed reverberation chamber in a defined, climate-controlled environment, such as a climate chamber, initially under normal conditions or atmosphere. Once the person performing the test has left the climate-controlled environment, the test atmosphere or environmental stress condition can be created and applied to the reverberation chamber, ensuring that the person performing the test is not exposed to any environmental stress conditions during the functional test. Furthermore, changing test atmospheres can be easily set without requiring any modifications to the reverberation chamber or its walls. Against this background, the solution according to the invention not only allows for functional testing that is compliant with standards and / or standardization, but also for functional testing that complies with occupational safety measures and conditions, particularly since – unlike in the prior art – undesirable exposure of the person performing the functional test to potentially problematic environmental stress conditions is avoided or at least significantly reduced. Furthermore, the solution according to the invention eliminates the need for the strenuous and potentially hazardous opening and / or closing of the reverberation chamber for the purpose of subjecting it to the environmental stress conditions. According to the invention, a test device is provided which enables a defined and user-friendly conformity test of an acoustic signal transmitter that is in line with occupational safety measures, and at the same time standardized or norm-compliant and ultimately reproducible. Moreover, the solution according to the invention provides the possibility of a particularly reproducible or precise and ultimately standard-compliant and / or standardized adjustment of the environmental stress conditions in the reverberation chamber, in particular since the ventilation opening(s) enable a defined or predetermined inlet and / or outlet of test atmosphere into or out of the reverberation chamber, especially with a reduced adjustment or exposure time until the predetermined test atmosphere inside the reverberation chamber is completely adjusted. This finding has proven particularly advantageous because – despite the ventilation opening(s) provided in the chamber wall according to the invention – the acoustic conditions in the reverberation chamber do not change to an extent outside the relevant standard or continue to allow a standard-compliant or standardized functional test of the acoustic signal generator within the reverberation chamber. In particular, based on this finding, the applicant was able to implement a structurally reliable, easy-to-implement, and at the same time user-friendly, especially safe and compliant with occupational safety regulations, technical implementation of a particularly efficient testing device, based on the ventilation opening(s) provided according to the invention, by means of which test atmosphere or environmental stress conditions can be defined and / or admitted into or released from the reverberation chamber to a predetermined extent, in particular for the defined or predetermined setting of environmental stress conditions in the reverberation chamber. In other words, the test device provided according to the invention enables precise compliance with the test requirements specified in particular in DIN EN 54-3 for simulating environmental stress conditions in a hall chamber. This applies especially to the required stress tests with regard to temperature stresses, such as heat and / or cold, humidity stresses, pressure stresses, etc., while it is equally possible to precisely control the test atmosphere in the hall chamber, for example, for the purpose of corrosion stress. At the same time, the test device according to the invention also provides a particularly safe and / or user-friendly or robust implementation of the functional test of an acoustic signal transmitter, whereby the occupational safety conditions to be observed can also be fully complied with or fulfilled. As a result of the adjustment of environmental stress conditions via the ventilation opening(s) in the chamber wall, manual or force-intensive relocation, for example lifting and / or pivoting, of a chamber wall by a person commissioned with the inspection is avoided or at least circumvented in such a way that no significant force or manual activity associated with a high risk of injury is necessary on the part of the personnel commissioned with the inspection. Within the scope of the present invention, a comprehensive technical solution is provided by means of which functional tests of an acoustic signal transmitter can be carried out in accordance with standards and / or in a standardized manner, in particular for conformity testing according to the requirements of and / or in accordance with DIN EN 54-3. This is primarily due to the use of a purposefully designed reverberation chamber or test device, the chamber wall of which has at least one ventilation opening, preferably a perforation, for the inlet and / or outlet of air, preferably a test atmosphere, into and / or out of the reverberation chamber and / or for the preferably defined and / or predetermined setting of environmental stress conditions in the reverberation chamber. The subject matter of the present invention – according to a first aspect of the present invention – is thus a test device for the functional testing, in particular in accordance with standards and / or standardization, of an acoustic signal generator, in particular an acoustic signal generator of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator, wherein the test device comprises: - a reverberation chamber, in particular a box-shaped reverberation test chamber, in particular wherein the reverberation chamber has a plurality of chamber walls, in particular six chamber walls, and / or is composed of a plurality of chamber walls, in particular six chamber walls, preferably wherein the reverberation chamber is bounded and / or formed by the chamber walls.- a microphone arranged in the reverberation chamber, preferably pivotably and / or rotatably mounted and / or attached, for detecting and / or recording an acoustic signal (warning signal) generated by the acoustic signal generator, in particular for detecting and / or recording a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator, in particular wherein the microphone is arranged and / or attached and / or mounted on a chamber wall of the reverberation chamber, preferably by means of a microphone holding device, in particular pivotably and / or rotatably, - a test specimen holder arranged in the reverberation chamber for holding and / or receiving an acoustic signal generator (test specimen) to be tested, in particular wherein the test specimen holder is attached to a chamber wall, preferably to a chamber wall opposite the microphone, preferably to a chamber wall opposite the microphone holding device for the microphone,is arranged and / or attached; wherein at least one ventilation opening, preferably a perforation, is arranged and / or formed and / or provided on and / or in at least one chamber wall, in particular for the preferably defined and / or predetermined inlet and / or outlet of air, preferably test atmosphere, into and / or out of the reverberation chamber and / or in particular for the preferably defined and / or predetermined setting of environmental stress conditions in the reverberation chamber. Of particular importance with regard to the present invention is the German version DIN EN 54-3:2014+A1:2019, which was developed as a replacement for DIN EN 54-3:2014-09. In this context, the term "acoustic signal generator" according to the invention preferably refers to a sound-generating device of a fire alarm system for acoustically warning persons in a building of fire. Preferably, according to the invention, the ventilation opening(s), in particular the cross-sectional area(s) of the ventilation opening(s), is / are dimensioned such that the acoustic properties, in particular the sound absorption area, of the reverberation chamber are at least substantially unchanged and / or that the acoustic properties, in particular the sound absorption area, of the reverberation chamber conform to standards and / or meet the requirements of DIN EN 54-3, in particular wherein the ventilation opening(s), in particular the cross-sectional area(s) of the ventilation opening(s), is / are dimensioned such that the sound absorption coefficient of the inside of the chamber wall(s) provided with the ventilation opening(s) is at most 0.06, in particular within the test frequency band, preferably in the range of 450 Hz (Hertz) to 3,150 Hz. In particular, according to the invention, the ventilation opening(s), especially the cross-sectional area(s) of the ventilation opening(s), is / are dimensioned such that the perforation ratio, calculated as the ratio of the cross-sectional area(s) of the ventilation opening(s) to the sum of the inner surfaces of all chamber walls, is at most 0.05, preferably wherein the perforation ratio, calculated as the ratio of the cross-sectional area(s) of the ventilation opening(s) to the sum of the inner surfaces of all chamber walls, varies in the range of 0.001 to 0.05, in particular in the range of 0.002 to 0.05, preferably in the range of 0.003 to 0.05. With regard to the above dimensions or adjustments of the ventilation opening(s), an optimal compromise can be achieved between defined or efficient adjustment of environmental stress conditions inside the reverberation chamber while simultaneously adhering to the maximum permissible sound absorption coefficient of the reverberation chamber. Furthermore, it has proven advantageous according to the invention if the ventilation opening(s) is / are provided and / or equipped with an air conveying device, in particular with a fan and / or blower, especially for the preferably defined and / or predetermined inlet and / or outlet of air, preferably test atmosphere, into and / or out of the reverberation chamber and / or especially for the preferably defined and / or predetermined adjustment of environmental stress conditions in the reverberation chamber. This enables a particularly reliable and rapid adjustment of the test atmosphere or the supply of the test atmosphere, in particular the environmental stress conditions, to the reverberation chamber. In particular, the air conveying device according to the invention is designed such that an air volume flow rate in the range of 0.1 to 10 times, particularly in the range of 0.2 to 5 times, preferably in the range of 0.5 to 3 times, the volume of the reverberation chamber can be conveyed per minute, in particular into and / or out of the reverberation chamber. This enables a particularly efficient and / or defined adjustment of environmental stress conditions inside the reverberation chamber, especially with a fast reaction time. This allows for a particularly reliable and rapid adjustment of the test atmosphere or the impregnation of the reverberation chamber with the test atmosphere, in particular the environmental stress conditions. Furthermore, according to the invention, it can be provided that at least one first ventilation opening, preferably a first opening, in particular for the preferably defined and / or predetermined inlet of air, preferably test atmosphere, into the reverberation chamber is arranged and / or formed and / or provided on and / or in a first chamber wall, and that at least one second ventilation opening, preferably a second opening, in particular for the preferably defined and / or predetermined outlet of air, preferably test atmosphere, from the reverberation chamber is arranged and / or formed and / or provided on and / or in a second chamber wall, in particular different from the first chamber wall and / or preferably opposite the first chamber wall.The provision of at least one first and at least one second ventilation opening, especially when arranged opposite each other, enables a particularly reliable and rapid adjustment of the test atmosphere or exposure of the reverberation chamber to the test atmosphere, especially the environmental stress conditions. In particular, according to the invention, the first ventilation opening and the second ventilation opening are arranged and / or designed for the preferably defined and / or predetermined setting of environmental stress conditions in the hall chamber. A further object of the present invention – according to a second aspect of the present invention – is, according to a particular embodiment of the present invention, a test device for the functional testing, in particular in accordance with standards and / or standardization, of an acoustic signal generator, in particular an acoustic signal generator of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator, in particular a test device according to one of the preceding claims, wherein the test device comprises: - a reverberation chamber, in particular a box-shaped reverberation test chamber, in particular wherein the reverberation chamber has a plurality of chamber walls, in particular six chamber walls, and / or consists of a plurality of chamber walls,in particular six chamber walls, is composed, preferably wherein the reverberation chamber is bounded and / or formed by the chamber walls, - a microphone arranged in the reverberation chamber, preferably pivotably and / or rotatably mounted and / or attached, for detecting and / or recording an acoustic signal (warning signal) generated by the acoustic signal generator, in particular for detecting and / or recording a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator, in particular wherein the microphone is arranged and / or attached and / or mounted on a chamber wall of the reverberation chamber, preferably by means of a microphone holding device, in particular pivotably and / or rotatably, - a test specimen holder arranged in the reverberation chamber for holding and / or receiving an acoustic signal generator (test specimen) to be tested, in particular wherein the test specimen holder is attached to a chamber wall,preferably arranged and / or attached to a chamber wall opposite the microphone, preferably to a chamber wall opposite the microphone holding device for the microphone; wherein at least one first ventilation opening, preferably a first opening, in particular for the preferably defined and / or predetermined inlet of air, preferably test atmosphere, into the reverberation chamber is arranged and / or formed and / or provided on and / or in a first chamber wall, and wherein at least one second ventilation opening, preferably a second opening, in particular for the preferably defined and / or predetermined outlet of air, preferably test atmosphere, is arranged and / or formed and / or provided on and / or in a second chamber wall, in particular different from the first chamber wall and / or preferably opposite the first chamber wall.from the reverberation chamber, arranged and / or designed and / or provided; in particular, wherein the first ventilation opening and the second ventilation opening are arranged and / or designed and / or interact for the preferably defined and / or predetermined setting of environmental stress conditions in the reverberation chamber. The provision of at least one first and at least one second ventilation opening, especially when arranged opposite each other, enables a particularly reliable and rapid adjustment of the test atmosphere or exposure of the reverberation chamber to the test atmosphere, especially the environmental stress conditions. Regarding further details, embodiments, configurations, advantages and special features of the subject matter of the present invention according to the second aspect of the present invention, reference can also be made to the above and subsequent explanations concerning the first aspect of the invention, which apply accordingly to the second aspect of the invention, in order to avoid unnecessary repetition. The following statements refer to both the first and the second aspect of the present invention. According to the invention, it is particularly advantageous if the first and second ventilation openings, in particular the (sum) cross-sectional areas of the first and second ventilation openings, are dimensioned such that the acoustic properties, in particular the sound absorption (area), of the reverberation chamber are at least substantially unchanged and / or that the acoustic properties, in particular the sound absorption (area), of the reverberation chamber are compliant with standards and / or meet the requirements of DIN EN 54-3. It is also particularly advantageous if the first and second ventilation openings, especially the (sum) cross-sectional areas of the first and second ventilation openings, are dimensioned such that the sound absorption coefficient of the inside of the chamber walls provided with the first and second ventilation openings is at most 0.06, especially within the test frequency band, preferably in the range from 450 Hz (Hertz) to 3,150 Hz, and / or if the first and second ventilation openings, especially the (sum) cross-sectional areas of the first and second ventilation openings, are dimensioned such that the perforation ratio, calculated as the ratio of the (sum) cross-sectional areas of the first and second ventilation openings to the sum of the inner surfaces of all chamber walls, is at most 0.05.In this way, according to the invention, it is particularly ensured that the acoustic properties, in particular the sound absorption area, of the reverberation chamber are at least substantially unchanged and / or that the acoustic properties, in particular the sound absorption area, of the reverberation chamber are compliant with standards and / or meet the requirements of DIN EN 54-3. Preferably, the perforation ratio, calculated as the ratio of the (sum) cross-sectional areas of the first and second ventilation openings to the sum of the inner surfaces of all chamber walls, varies in the range of 0.001 to 0.05, particularly in the range of 0.002 to 0.05, preferably in the range of 0.003 to 0.05. According to the invention, this also ensures in particular that the acoustic properties, especially the sound absorption area, of the reverberation chamber are at least substantially unchanged and / or that the acoustic properties, especially the sound absorption area, of the reverberation chamber conform to standards and / or meet the requirements of DIN EN 54-3. It is particularly preferred if the first ventilation opening is provided and / or equipped with a first air conveying device, in particular with a fan and / or blower, for the preferably defined and / or predetermined inlet of air, preferably test atmosphere, and / or, preferably, if the second ventilation opening is provided and / or equipped with a second air conveying device, in particular with a fan and / or blower, for the preferably defined and / or predetermined outlet of air, preferably test atmosphere, from the reverberation chamber, in particular wherein the first and / or second air conveying device is / are designed such that an air volume flow in the range of 0.1 to 10 times, in particular in the range of 0.2 to 5 times, preferably in the range of 0.5 to 3 times, of the volume of the reverberation chamber can be conveyed per minute.This allows for particularly rapid and reliable adjustment of the environmental stress conditions within the reverberation chamber. In particular, it has proven advantageous if the first ventilation opening and the second ventilation opening are arranged and / or aligned vertically and / or horizontally offset from each other, preferably vertically and horizontally offset from each other, preferably diagonally offset from each other, preferably on two opposite chamber walls, preferably on two opposite end chamber walls (end faces), and especially wherein the first ventilation opening and the second ventilation opening preferably have at least substantially the same cross-sectional area and / or the same cross-sectional shape. This enables particularly efficient adaptation to the specified environmental stress conditions. In addition, this ensures particularly fast and reliable exposure to the test atmosphere. Preferably, the chamber walls are connected to each other in a soundproof manner and / or in an airtight manner, and define the reverberation chamber. In particular, the reverberation chamber has two opposing end chamber walls (end walls) as first and second chamber walls and preferably four base chamber walls connecting the end chamber walls as chamber walls. According to a particularly preferred embodiment, it is also provided according to the invention that the ventilation opening(s) is / are arranged and / or formed on and / or in at least one end chamber wall (end wall) and / or that the first ventilation opening is arranged and / or formed on a first chamber wall, preferably end chamber wall (end wall), and the second ventilation opening is arranged and / or formed on a second chamber wall, preferably opposite the first end chamber wall (end wall), preferably end chamber wall (end wall). In general, according to the invention, it can be advantageously provided that the reverberation chamber has a chamber volume, in particular an internal chamber volume, in cubic meters (m3) in the range of 0.5 m3 to 5 m3, particularly in the range of 0.6 m3 to 3 m3, preferably in the range of 0.7 m3 to 2 m3, and / or that the chamber volume, in particular an internal chamber volume, of the reverberation chamber in cubic meters (m3) is selected such that the volume of the test specimen is at most 5% of the chamber volume of the reverberation chamber. The chamber volume, in particular the internal chamber volume, of the reverberation chamber in cubic meters (m3) is advantageously not less than 0.5 or not less than 125 x 106 / f3, wherein 90% of the sound power in the reverberation chamber is at frequencies above f, whichever is the larger value. According to the invention, it is particularly advantageous if the reverberation chamber is designed to be reversibly opened and closed on at least one side, in particular for inserting and / or removing an acoustic signal generator (test specimen) to be tested into and / or from the reverberation chamber; and / or if the reverberation chamber has at least one reversibly closable chamber wall, in particular an end chamber wall (end wall), in particular for inserting and / or removing an acoustic signal generator (test specimen) to be tested into and / or from the reverberation chamber; and / or if at least one chamber wall, in particular an end chamber wall (end wall), is removable and / or pivotable, in particular pivotable, for opening and / or closing the reverberation chamber, in particular for inserting and / or removing an acoustic signal generator (test specimen) to be tested into and / or from the reverberation chamber; and / or if two, preferably opposing, chamber walls,in particular two opposing end chamber walls (end walls), which are removable and / or pivotable, in particular pivotable, arranged and / or designed for opening and / or closing the reverberation chamber, in particular for inserting and / or removing an acoustic signal transmitter (test specimen) to be tested into and / or out of the reverberation chamber. Alternatively or additionally, it can also be provided according to the invention that at least one chamber wall, in particular an end chamber wall (end wall), is preferably at least substantially soundproof and / or preferably at least substantially airtight, and is closable; in particular wherein the closable chamber wall, in particular end chamber wall (end wall), has at least one releasable closure device, preferably for at least substantially soundproof and / or preferably for at least substantially airtight closure of the reverberation chamber;preferably wherein the locking device is designed as a, in particular, one- or multi-part clamping locking system, preferably consisting of a plurality of similar locking devices and / or preferably wherein the locking device comprises a plurality of locking devices distributed, in particular, on the edge, preferably circumferentially, on the chamber wall, in particular the end chamber wall (end wall). This will ensure quick, easy and reliable opening and, in particular, sealing (re-)closing of the reverberation chamber. According to the invention, it has further proven advantageous if the microphone and / or the microphone holding device is / are arranged on a chamber wall, preferably the first end chamber wall (end wall); and / or if the test specimen holder is / are arranged and / or formed on a second chamber wall, preferably the second end chamber wall; and / or if the microphone and / or the microphone holding device on the one hand and the test specimen holder on the other hand are arranged and / or formed on opposite chamber walls, in particular opposite end chamber walls (end walls). In this context, it is advantageous according to the invention if the microphone is pivotably and / or rotatably arranged and / or attached and / or mounted on a chamber wall, preferably end chamber wall (end wall), of the reverberation chamber on a circular path with a diameter of at least 100 mm, preferably at least 200 mm, in particular at least 300 mm. As regards the microphone, according to the invention it has proven particularly advantageous if the microphone is arranged and / or attached and / or mounted in a pivot plane on the chamber wall, preferably the end wall, of the reverberation chamber, in the reverberation chamber, in particular by means of a microphone holding device, preferably by means of a microphone traverse of the microphone holding device; in particular wherein the pivot plane is inclined to at least one chamber wall, preferably to at least two opposite end walls, in particular inclined at an angle of inclination of more than 10°;and / or, in particular, wherein the microphone holding device comprises a microphone traverse (in which the microphone is arranged and / or held and / or attached to the microphone traverse, preferably wherein the microphone traverse is inclined to at least one chamber wall, preferably to two opposing end chamber walls (end walls), in particular inclined by more than 10°; and / or, in particular, wherein no point of the microphone traverse is closer than λ / 4 (lambda / 4) to at least one, preferably each, chamber wall, preferably wherein λ (lambda) is the wavelength of the lowest frequency range to be examined of the acoustic signal generated by the signal generator. Advantageously, the distance between the microphone, particularly with respect to any swivel position of the microphone in the reverberation chamber, and the test specimen holder is more than 0.2 V1 / 3, particularly more than 0.25 V1 / 3, preferably more than 0.3 V1 / 3, where V corresponds to the (internal) volume of the reverberation chamber (m3). Furthermore, according to the invention, it has proven advantageous if the test device comprises at least one signal processing device connected to and / or associated with the microphone, in particular a sound (pressure) level measuring device, especially for measuring the sound pressure level picked up by the microphone using the acoustic signal generated by the signal transmitter. The sound (pressure) level measuring device can be designed either as a separate device or as a device integrated into the microphone. Particularly preferred in this context is the provision that the microphone and / or the microphone holding device is automatically and / or automatically swivelle and / or rotatable, especially during functional testing, and / or that the microphone and / or the microphone holding device is automatically and / or automatically swivelle and / or rotated, especially during functional testing, preferably by means of a microphone swivel device connected to and / or associated with the microphone and / or the microphone holding device; in particular wherein the microphone swivel device is controlled and / or controllable by means of a control device. It has further proven advantageous if the reverberation chamber has six chamber walls which are designed and / or aligned in such a way that either no surfaces of the chamber walls run parallel, preferably wherein the angles of inclination between adjacent chamber walls are designed so that resonances are reduced to a minimum and the maximum length, width and height of the chamber walls are the same, or that the reverberation chamber is rectangular and / or cuboid in shape, in particular with three different side lengths x, y and z;in particular wherein the ratio of the side length y / x is in the range of 0.6 to 1.0, particularly in the range of 0.7 to 0.9, preferably in the range of 0.75 to 0.85, particularly preferably in the range of 0.79 to 0.83, and the ratio of the side length z / x is in the range of 0.3 to 0.7, preferably in the range of 0.4 to 0.7, particularly in the range of 0.45 to 0.65, particularly preferably in the range of 0.47 to 0.63. Advantageously, according to the invention, the chamber walls have at least substantially the same sound reflection and / or at least substantially the same sound absorption coefficient, in particular a sound absorption coefficient of at most 0.06, in particular wherein each chamber wall has a sound absorption coefficient of at most 0.06. Furthermore, according to the invention, it has proven advantageous if the chamber wall(s) has / have or consist of at least a laminated material and / or a wood material, in particular a wood-based laminated material; in particular wherein at least one chamber wall, preferably each chamber wall, has or consists of a laminated material and / or a wood material, in particular a wood-based laminated material. In this context, it is preferably provided according to the invention if the chamber wall(s), preferably each chamber wall, has a thickness of at least 15 mm, in particular at least 20 mm, preferably at least 25 mm; and / or if the chamber wall(s), preferably each chamber wall, has a thickness in the range of 10 V1 / 3 to 30 V1 / 3, in particular in the range of 15 V1 / 3 to 25 V1 / 3, in particular in the range of 20 V1 / 3 to 25 V1 / 3, where V corresponds to the (internal) volume of the reverberation chamber (m3). Furthermore, according to the invention, it has proven advantageous if the environmental stress conditions are selected from the group of temperature, (air) humidity, pressure, corrosion stress and their combinations, in particular from the group of temperature, (air) humidity, pressure and their combinations. Particularly preferred are the environmental stress conditions selected from the group of (i) thermal testing conditions, wherein the temperature in the reverberation chamber during the thermal testing condition is set to a defined temperature from the range of 38 °C to 90 °C, preferably to 40 °C to 80 °C, particularly to 45 °C to 70 °C; and / or (ii) cold testing conditions, wherein the temperature in the reverberation chamber during the cold testing condition is set to a defined temperature from the range of -40 °C to 0 °C, preferably to -30 °C to -5 °C, particularly to -25 °C to -10 °C; and / or (iii) humidity conditions, wherein the (air) humidity in the reverberation chamber during the humidity test is set to a defined humidity from the range of 80% to 98%, preferably to 85% to 95%, particularly to 90% to 95%.and / or (iv) corrosion resistance test conditions, wherein the sulfur dioxide content in the Hall chamber during the corrosion resistance test is adjusted to a value in the range of 10 µl / l to 50 µl / l, in particular to 15 µl / l to 40 µl / l, preferably to 20 µl / l to 30 µl / l; and any combination thereof. In general, environmental stress conditions can include a combination of predetermined and / or defined values ​​of temperature and (air) humidity, and possibly pressure. In particular, the test device is designed such that a functional test can be carried out within a test frequency band in the range of 450 Hz (Hertz) to 3,150 Hz; and / or that a functional test can be carried out within a test frequency band, in particular in the range of 450 Hz (Hertz) to 3,150 Hz, with an accuracy and / or reliability of at least ± 2 dB (decibels), in particular with an accuracy and / or reliability of at least ± 1.5 dB, preferably with an accuracy and / or reliability in the range of ± (0.5 to 2) dB, in particular with regard to a single value measurement. The test device according to the invention is particularly suitable for use in a test method for the functional testing of an acoustic signal generator, in particular an acoustic signal generator of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator, wherein the following process steps are carried out, in particular in the (temporal) sequence of process steps specified below: A) Provision of a reverberation chamber, in particular a box-shaped reverberation test chamber, in particular wherein the reverberation chamber has a plurality of chamber walls, in particular six chamber walls, and / or is composed of a plurality of chamber walls, in particular six chamber walls,preferably wherein the reverberation chamber is bounded and / or formed by the chamber walls, comprising: - a microphone arranged in the reverberation chamber, preferably pivotably and / or rotatably mounted and / or attached, for detecting and / or recording an acoustic signal (warning signal) generated by the acoustic signal generator, in particular for detecting and / or recording a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator; in particular wherein the microphone is arranged and / or attached and / or mounted on a chamber wall of the reverberation chamber, preferably by means of a microphone holding device, in particular pivotably and / or rotatably; - a test specimen holder arranged in the reverberation chamber for holding and / or receiving an acoustic signal generator (test specimen) to be tested; in particular wherein the test specimen holder is attached to a chamber wall, preferably to a chamber wall opposite the microphone,preferably arranged and / or attached to a chamber wall opposite the microphone holder for the microphone; - at least one ventilation opening, preferably a perforation, arranged and / or provided on and / or in at least one chamber wall, preferably for the preferably defined and / or predetermined inlet and / or outlet of air, preferably test atmosphere, into and / or out of the reverberation chamber and / or preferably for the preferably defined and / or predetermined setting of environmental stress conditions in the reverberation chamber; B) Arrangement of an acoustic signal transmitter (test specimen) to be tested in the reverberation chamber, preferably on the test specimen holder; C) Setting of first environmental stress conditions, in particular normal and / or standard conditions, in the reverberation chamber to generate a first test atmosphere via the ventilation opening,wherein the acoustic signal generator is exposed to the first test atmosphere for a defined period of time, and subsequent triggering of a first acoustic signal (warning signal) generated by the acoustic signal generator with a first sound pressure level under the first test atmosphere, and detection and / or recording of the first acoustic signal (warning signal) generated by the acoustic signal generator, in particular the first sound pressure level of the first acoustic signal (warning signal) generated by the acoustic signal generator, via the microphone, in particular wherein the microphone is pivoted and / or rotated at least temporarily during detection and / or recording in the reverberation chamber; preferably wherein process step C) or the triggering of the first acoustic signal (warning signal) with the detection and / or recording of the first acoustic signal, in particular the first sound pressure level, is repeated.in particular for generating a (statistical) mean value for the first sound pressure level measurement; D) setting of second environmental stress conditions, preferably different from the first environmental stress conditions, in particular load conditions, in the reverberation chamber to generate a second test atmosphere via the ventilation opening, wherein the acoustic signal generator is exposed to the second test atmosphere for a defined period of time, and subsequently (i) either triggering a second acoustic signal (warning signal) generated by the acoustic signal generator with a second sound pressure level under the second test atmosphere and detecting and / or recording the second acoustic signal (warning signal) generated by the acoustic signal generator, in particular the second sound pressure level of the second acoustic signal (warning signal) generated by the acoustic signal generator, via the microphone,in particular wherein the microphone is swiveled and / or rotated at least temporarily during the detection and / or recording in the reverberation chamber; (ii) or (re-)setting of initial environmental stress conditions in the reverberation chamber to generate a first test atmosphere via the ventilation opening, wherein the acoustic signal generator is exposed to the first test atmosphere for a defined period of time, and subsequent triggering of a second acoustic signal (warning signal) generated by the acoustic signal generator with a second sound pressure level below the first test atmosphere and detection and / or recording of the second acoustic signal (warning signal) generated by the acoustic signal generator, in particular the second sound pressure level of the second acoustic signal (warning signal) generated by the acoustic signal generator, via the microphone,in particular wherein the microphone is swiveled and / or rotated at least temporarily during the acquisition and / or recording in the reverberation chamber; preferably wherein process step D) or the triggering of the second acoustic signal (warning signal) is repeated with the acquisition and / or recording of the second acoustic signal, in particular the second sound pressure level, in particular to generate a (statistical) mean value for the second sound pressure level measurement; E) comparison and / or alignment of the measured values ​​determined in process steps C) and D), in particular acoustic, in particular sound pressure level measurements, preferably in correlation with the specified requirements. Regarding further details, embodiments, configurations, advantages and special features, reference can also be made to the above statements on the first and second aspects of the invention and to the statements that follow, which apply accordingly, in order to avoid unnecessary repetition. Furthermore, the test device according to the invention is particularly suitable for use in a test method for the functional testing of an acoustic signal generator, in particular an acoustic signal generator of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator, with and / or using a test device according to the present invention as described above, wherein the following method steps are carried out, in particular in the (temporal) sequence of the method steps specified below: A) Provision of a test device according to the present invention as described above;B) Arranging an acoustic signal generator (test object) to be tested in the reverberation chamber, preferably on the test object holder;C) Setting initial environmental stress conditions, in particular normal and / or standard conditions, in the reverberation chamber to generate a first test atmosphere via the ventilation opening, wherein the acoustic signal generator is exposed to the first test atmosphere for a defined period of time, and subsequent triggering of a first acoustic signal (warning signal) generated by the acoustic signal generator with a first sound pressure level below the first test atmosphere and detection and / or recording of the first acoustic signal (warning signal) generated by the acoustic signal generator, in particular the first sound pressure level of the first acoustic signal (warning signal) generated by the acoustic signal generator, via the microphone, in particular wherein the microphone is swiveled and / or rotated at least temporarily during detection and / or recording in the reverberation chamber;preferably wherein process step C) or the triggering of the first acoustic signal (warning signal) is repeated with the detection and / or recording of the first acoustic signal, in particular the first sound pressure level, especially to generate a (statistical) mean value for the first sound pressure level measurement;D) Setting a second environmental stress condition, preferably different from the first environmental stress conditions, in particular stress conditions, in the reverberation chamber to generate a second test atmosphere via the ventilation opening, wherein the acoustic signal generator is exposed to the second test atmosphere for a defined period of time, and subsequently (i) either triggering a second acoustic signal (warning signal) generated by the acoustic signal generator with a second sound pressure level under the second test atmosphere and detecting and / or recording the second acoustic signal (warning signal) generated by the acoustic signal generator, in particular the second sound pressure level of the second acoustic signal (warning signal) generated by the acoustic signal generator, via the microphone, in particular wherein the microphone is swiveled and / or rotated at least temporarily during the detection and / or recording in the reverberation chamber;(ii) or (re-)setting initial environmental stress conditions in the reverberation chamber to generate a first test atmosphere via the ventilation opening, wherein the acoustic signal generator is exposed to the first test atmosphere for a defined period of time, and subsequent triggering of a second acoustic signal (warning signal) generated by the acoustic signal generator with a second sound pressure level below the first test atmosphere and detection and / or recording of the second acoustic signal (warning signal) generated by the acoustic signal generator, in particular the second sound pressure level of the second acoustic signal (warning signal) generated by the acoustic signal generator, via the microphone, in particular wherein the microphone is swiveled and / or rotated at least temporarily during detection and / or recording in the reverberation chamber;preferably wherein process step D) or the triggering of the second acoustic signal (warning signal) is repeatedly carried out with the detection and / or recording of the second acoustic signal, in particular the second sound pressure level, especially to generate a (statistical) mean value for the second sound pressure level measurement; E) comparison and / or alignment of the measured values ​​determined in process steps C) and D), in particular acoustic, in particular sound pressure level measurements, preferably in correlation with the specified requirements.; In particular, the first environmental stress conditions are normal and / or standard conditions, normal climate conditions according to EN 60068-1:1994. Particularly preferred are the first environmental exposure conditions, especially normal and / or standard conditions, selected as follows: (i) temperature in the range of 15 °C to 35 °C, (ii) relative (air) humidity in the range of 25 % to 75 %, (iii) (air) pressure in the range of 86 kPa to 106 kPa. According to a preferred method, the second environmental stress conditions, in particular load conditions, are different from the first environmental stress conditions. Particularly preferred in this context is the provision if the second environmental stress conditions, in particular loading conditions, differ from the first environmental stress conditions, especially with regard to temperature, preferably wherein the temperature of the second environmental stress conditions is above the temperatures of the first environmental stress conditions, in particular above 35 °C, or preferably wherein the temperature of the second environmental stress conditions is below the temperatures of the first environmental stress conditions, in particular below 35 °C. Alternatively or additionally, it may be provided that the second environmental stress conditions, in particular stress conditions, are selected as follows: (i) temperature in the range below 15 °C, in particular in the range of -40 °C to 0 °C, or temperature in the range above 35 °C, in particular in the range of 38 °C to 90 °C, (ii) relative (air) humidity in the range of 25 % to 98 %, (iii) (air) pressure in the range of 86 kPa to 106 kPa. In this context, it has also proven advantageous if the second environmental stress conditions, in particular load conditions, differ from the first environmental stress conditions, wherein the second environmental stress conditions are selected from the group of (i) thermal testing conditions, wherein the temperature in the Hall chamber during the thermal testing condition is set to a defined temperature from the range of 38 °C to 90 °C, preferably to 40 °C to 80 °C, particularly to 45 °C to 70 °C; and / or (ii) cold testing conditions, wherein the temperature in the Hall chamber during the cold testing condition is set to a defined temperature from the range of -40 °C to 0 °C, preferably to -30 °C to -5 °C, particularly to -25 °C to -10 °C;and / or (iii) humidity conditions, wherein the (air) humidity in the Hall chamber during the humidity test is adjusted to a defined humidity from the range of 80% to 98%, preferably to 85% to 95%, particularly to 90% to 95%; and / or (iv) corrosion resistance test conditions, wherein the sulfur dioxide content in the Hall chamber during the corrosion resistance test is adjusted to a value from the range of 10 µl / l to 50 µl / l, particularly to 15 µl / l to 40 µl / l, preferably to 20 µl / l to 30 µl / l; and any combinations thereof. According to the invention, it is preferably provided that the comparison and / or adjustment carried out in step E) is performed in such a way that, upon reaching and / or falling below a defined and / or predetermined limit value, in particular a defined and / or predetermined limit value with regard to the difference and / or deviation of the measured values ​​determined in process steps C) and D), in particular acoustic, especially sound pressure level measured values, a fulfillment or non-fulfillment of the functional test of the acoustic signal transmitter is determined. Alternatively or additionally, it may also be provided in this context that the comparison and / or adjustment carried out in step E) is performed in such a way that, upon reaching and / or falling below a defined and / or specified limit value, in particular a defined and / or specified limit value for a differential acoustic signal, in particular for a differential sound pressure level measurement (delta sound pressure level), the measured values ​​determined in the process steps C) and D), in particular acoustic, in particular sound pressure level measurements, a fulfillment or non-fulfillment of the functional test of the acoustic signal transmitter is determined;in particular wherein, at a limit value, in particular a defined and / or predetermined limit value with regard to the difference and / or deviation of the measured values ​​determined in process steps C) and D), in particular acoustic, in particular sound pressure level measurements, preferably at a differential acoustic signal, in particular differential sound pressure level measurement (delta sound pressure level), of at most 10 dB, preferably at most 8 dB, in particular at most 6 dB, a fulfillment of the functional test of the acoustic signal transmitter is determined, and if this limit value is exceeded by more than 10 dB, preferably more than 8 dB, in particular more than 6 dB, a failure of the functional test of the acoustic signal transmitter is determined. Advantageously, the first and second environmental stress conditions for generating the first and second test atmospheres are set via the at least one ventilation opening, preferably by means of an air conveying device, a preferably defined and / or predetermined airflow; in particular, an air volume flow, especially the air volume flow of the test atmosphere, in the range of 0.1 to 10 times, especially in the range of 0.2 to 5 times, preferably in the range of 0.5 to 3 times, of the volume of the reverberation chamber per minute is conveyed, especially into and / or out of the reverberation chamber. Furthermore, at least one first ventilation opening, preferably a first opening, in particular for the preferably defined and / or predetermined inlet of air, preferably test atmosphere, into the reverberation chamber can advantageously be arranged and / or formed and / or provided on and / or in a first chamber wall, wherein at least one second ventilation opening, preferably a second opening, in particular for the preferably defined and / or predetermined outlet of air, preferably test atmosphere, from the reverberation chamber can be arranged and / or formed and / or provided on and / or in a second chamber wall, in particular different from the first chamber wall and / or preferably opposite the first chamber wall;in particular wherein the first ventilation opening and the second ventilation opening are arranged and / or designed and / or interact for the preferably defined and / or predetermined setting of environmental stress conditions in the hall chamber. The environmental stress conditions are most preferably set for a stress period of at least 2 hours, preferably at least 5 hours, particularly at least 10 hours, most preferably at least 15 hours, and most preferably about 16 hours. Regarding further details, embodiments, configurations, advantages and special features of the subject matter of the present invention according to this aspect of the present invention, reference may also be made to the above statements and to the statements that follow, which apply accordingly, in order to avoid unnecessary repetition. Furthermore, a third aspect of the present invention relates to the use of a test device as described above for the functional testing of an acoustic signal generator, in particular an acoustic signal generator of a fire alarm system, in particular for conformity testing in accordance with and / or standards according to DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator. Regarding further details, embodiments, configurations, advantages and special features of the subject matter of the present invention according to the fifth aspect of the present invention, reference may also be made to the above statements on the first and second aspects of the invention and to the subsequent statements on the fourth aspect of the invention, which apply accordingly to the third aspect of the invention, in order to avoid unnecessary repetition. In particular, the test device according to the invention is used to carry out the method described above. Finally, a further object of the present invention – according to a fourth aspect of the present invention – is also an inventive use of a reverberation chamber for the in particular standard-compliant and / or standardized functional testing of an acoustic signal generator, in particular an acoustic signal generator of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator;in particular wherein different environmental stress conditions, in particular as defined above, are preferably defined and / or predetermined in the reverberation chamber before and / or during the measurements, in particular by introducing and / or releasing air, preferably test atmosphere, into and / or out of the reverberation chamber via at least one ventilation opening, preferably a perforation, arranged and / or formed and / or provided, in particular in the chamber wall. In particular, a preferably defined and / or predetermined airflow, preferably a test atmosphere, is admitted into and / or discharged from the reverberation chamber via ventilation opening(s), preferably by means of an air conveying device, in particular by means of a fan and / or blower, especially for the preferably defined and / or predetermined setting of environmental stress conditions in the reverberation chamber. Furthermore, it has proven advantageous if at least one first ventilation opening, preferably a first opening, in particular for the preferably defined and / or predetermined inlet of air, preferably test atmosphere, into the reverberation chamber is arranged and / or formed and / or provided on and / or in a first chamber wall, and wherein at least one second ventilation opening, preferably a second opening, in particular for the preferably defined and / or predetermined outlet of air, preferably test atmosphere, from the reverberation chamber is arranged and / or formed and / or provided on and / or in a second chamber wall, in particular different from the first chamber wall and / or preferably opposite the first chamber wall. In particular, the first ventilation opening and the second ventilation opening are arranged and / or designed for the preferably defined and / or predetermined setting of environmental stress conditions in the hall chamber and / or interact accordingly. Regarding further details, embodiments and configurations, advantages and special features of the subject matter of the present invention according to the fourth aspect of the present invention, reference can also be made to the above statements on the other aspects of the invention, which apply accordingly with regard to the fourth aspect of the invention, in order to avoid unnecessary repetition. The present invention is described below with reference to preferred embodiments and illustrative drawings and figures, the descriptions of which apply to all aspects of the invention and in which the corresponding preferred embodiments and configurations of the present invention are in no way limiting; further advantages, properties, aspects and features of the present invention are also shown in the description of the figures. The figures show: Fig. 1A schematic sectional views of a test device for the functional testing of an acoustic signal transmitter, in particular in accordance with standards and / or standardised, comprising a reverberation chamber, in particular box-shaped, a microphone arranged in the reverberation chamber, in particular pivotably mounted, and a test specimen holder arranged in the reverberation chamber, on which the acoustic signal transmitter to be tested is held, according to a particular, first embodiment of the present invention (cuboid shape of the reverberation chamber); Fig.Figure 1B shows a schematic sectional view of a test device for the functional testing of an acoustic signal generator, in particular in accordance with standards and / or standardization, comprising a reverberation chamber, in particular a box-shaped one, a microphone arranged in the reverberation chamber, in particular a pivotable microphone, and a test specimen holder arranged in the reverberation chamber, on which the acoustic signal generator to be tested is held, according to a particular, second embodiment of the present invention (reverberation chamber without right angles); Figure 2 shows a schematic sectional view of the test device according to the invention for the functional testing of an acoustic signal generator, in particular an acoustic signal generator of a fire alarm system, in particular for conformity testing according to the requirements of and / or in accordance with DIN EN 54-3 according to a particular, third embodiment of the present invention; Figure 2 shows a schematic sectional view of the test device according to the invention for the functional testing of an acoustic signal generator, in particular an acoustic signal generator of a fire alarm system, in particular for conformity testing according to the requirements of and / or in accordance with DIN EN 54-3, according to a particular, third embodiment of the present invention; Figure 3 shows a schematic sectional view of the test device according to the invention for the functional testing of an acoustic signal generator, in particular an acoustic signal generator of a fire alarm system, in particular for conformity testing according to the requirements of and / or in accordance with DIN EN 54-3, according to a particular, third embodiment of the present invention.Fig. 3 a perspective view of a test device according to the invention for the functional testing of an acoustic signal generator, in particular an acoustic signal generator of a fire alarm system according to a particular embodiment of the present invention, in a manner that complies with standards and / or standardises; Fig. 4 a further view of the test device according to Fig. 3, with the end wall of the chamber opened to show a test chamber inside the reverberation chamber; and Fig. 5 a schematic representation of a procedure sequence provided according to the invention, in particular using the test device according to the invention. In the figures shown in Fig. 1A, Fig. 1B, Fig. 2, Fig. 3 and Fig. 4, a test device 1 according to the invention is shown schematically in various embodiments. The test device 1 according to these figures is designed in particular for the standard-compliant and / or standardized functional testing of an acoustic signal generator 2 of a fire alarm system, in particular for conformity testing according to the requirements of and / or in accordance with DIN EN 54-3, in particular wherein a measurement or evaluation of a sound pressure level of an acoustic signal or warning signal generated by the acoustic signal generator 2 is carried out. The test device 1 according to Fig. 1A, Fig. 1B, Fig. 2, Fig. 3 and Fig. 4 comprises: - a reverberation chamber 3, in particular a reverberation test chamber, in particular wherein the reverberation chamber 3 has a plurality of chamber walls 4, in particular six chamber walls 4, and / or is composed of a plurality of chamber walls 4, in particular six chamber walls 4, preferably wherein the reverberation chamber 3 is bounded and / or formed by the chamber walls 4, - a microphone 5 arranged in the reverberation chamber 3, preferably pivotably and / or rotatably mounted and / or attached, for detecting and / or recording an acoustic signal (warning signal) generated by the acoustic signal generator 2, in particular for detecting and / or recording a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator 2, in particular wherein the microphone 5 is preferably mounted by means of a microphone holding device 6,in particular pivotable and / or rotatable, arranged and / or attached and / or mounted on a chamber wall 4 of the reverberation chamber 3, - a test specimen holder 7 arranged in the reverberation chamber 3 for holding and / or receiving an acoustic signal transmitter (test specimen) 2 to be tested, in particular wherein the test specimen holder 7 is arranged and / or attached to a chamber wall 4, preferably to a chamber wall 4 opposite the microphone 5, preferably to a chamber wall 4 opposite the microphone holding device 6 for the microphone 5; wherein at least one ventilation opening 8A, 8B, preferably a perforation, in particular for the preferably defined and / or predetermined inlet and / or outlet of air, preferably test atmosphere, is provided on and / or in at least one chamber wall 4.into and / or out of the hall chamber 3 and / or in particular for the preferably defined and / or predetermined setting of environmental stress conditions in the hall chamber 3, arranged and / or designed and / or provided. The test device 1 according to the invention, in the illustrated and preferred embodiments according to Fig. 1A, Fig. 1B, Fig. 2, Fig. 3 and Fig. 4, therefore has two ventilation openings 8A and 8B on and / or in at least one chamber wall 4, in particular on two opposing chamber walls 4A and 4B, which are preferably designed as openings. Air, preferably a test atmosphere, is then supplied and / or discharged via the ventilation openings 8A and 8B into and / or out of the reverberation chamber 3, in particular wherein a defined and / or predetermined setting of environmental stress conditions is provided in the reverberation chamber 3. The first ventilation opening 8A is provided and / or equipped with a first air conveying device 9A, in particular with a fan and / or blower, for the preferably defined and / or predetermined inlet of air, preferably test atmosphere. The second ventilation opening 8B is provided and / or equipped with a second air conveying device 9B, in particular with a fan and / or blower, for the preferably defined and / or predetermined discharge of air, preferably test atmosphere, from the hall chamber 3. In the illustrated and preferred embodiment, the first ventilation opening 8A and the second ventilation opening 8B are arranged and / or aligned vertically and / or horizontally, preferably vertically and horizontally offset from each other, preferably diagonally offset from each other, in particular wherein corresponding ventilation openings 8A and 8B with associated air conveying devices 9A, 9B are provided on two opposite chamber walls 4A, 4B, preferably on two opposite end chamber walls (end faces). In the embodiment shown in Fig. 1A, the reverberation chamber is rectangular or cuboid in shape, such that, with reference to the cross-section, adjacent side or chamber walls 4 are aligned at least substantially at right angles or orthogonally to each other with respect to x, y, z. In the embodiment shown in Fig. 1B, however, the reverberation chamber 4 is not cuboid in shape, and the angles of inclination between the adjacent chamber walls 4 are designed in such a way that resonances are reduced to a minimum and at the same time no surfaces of the chamber walls 4 run parallel to each other. In particular, the test device 1 also has at least one lockable chamber wall 4, in this case at least one end chamber wall 4A, 4B. For this purpose, at least one releasable locking device 10 is provided for sealing the reverberation chamber 3 in a way that is at least substantially soundproof and preferably at least substantially airtight, in particular wherein the locking device 10 is a multi-part tension locking system comprising a plurality of similar locking mechanisms, namely quick-release locking mechanisms. One possible configuration of the locking device 10 as a multi-part tension locking system, or with a plurality of locking devices, particularly of the same type, is shown in the embodiment illustrated in Figs. 2, 3, and 4. In this embodiment, a first air conveying device 9A is arranged on a first chamber wall 4A in the form of an end chamber wall, whereas the second air conveying device 9B is arranged on a base chamber wall, in the illustrated example on the upper base chamber wall or on the top of the chamber 3. The microphone 5 is preferably arranged or held in a pivoting plane on an end wall 4A, preferably by means of a microphone traverse 11. The pivot plane is preferably inclined to at least one chamber wall 4, preferably to two opposing end chamber walls (end walls), or has an angle of inclination of at least 10° or more than 10°, preferably more than 10°. Preferably, the microphone holding device 6 has a microphone traverse 11, wherein the microphone 5 is arranged and / or held and / or attached to the microphone traverse 11 and the microphone traverse 11 is inclined to at least one chamber wall 4, preferably to two opposing end chamber walls 4A or 4B, in particular inclined at an angle of inclination of more than 10°. The test device 1 further comprises at least one signal processing device 12 connected to and / or associated with the microphone 5. Furthermore, the microphone 5 and / or the microphone holding device 6 has a microphone swivel device 13, particularly during functional testing, so that the microphone 5 can be swivelled and / or rotated automatically and / or automatically, preferably wherein the microphone 5 or the microphone holding device 6 is swivelled and / or rotated automatically and / or automatically, preferably by means of the microphone swivel device 13 connected to and / or associated with the microphone 5 and / or the microphone holding device 6. Particularly preferably, the test device 1 has a control device 14 by means of which the microphone swivel device 13 is controlled and / or controllable. The following section explains the procedure for carrying out the method provided according to the invention, in particular using the test device 1 according to the invention, with reference to Fig. 5. The present invention also relates to the use of the test device 1 in a test method for the functional testing, in particular in accordance with standards and / or standardization, of an acoustic signal generator 2, in particular an acoustic signal generator 2 of a fire alarm system, in particular for conformity testing according to the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator 2, in particular with and / or using a test device 1 of the type according to the invention or previously described, wherein the following method steps are carried out, in particular in the (temporal) sequence of the method steps specified below: A) Provision of a reverberation chamber 3, in particular a box-shaped reverberation test chamber, in particular wherein the reverberation chamber 3 has a plurality of chamber walls 4,in particular six chamber walls 4, and / or is composed of a plurality of chamber walls 4, in particular six chamber walls 4, preferably wherein the reverberation chamber 3 is bounded and / or formed by the chamber walls 4, Step A. B) Arranging an acoustic signal generator (test specimen) 2 to be tested in the reverberation chamber 3, preferably on the test specimen holder 7, Step B. C) Setting first environmental stress conditions, in particular normal and / or standard conditions, in the reverberation chamber 3 to generate a first test atmosphere via the ventilation opening 8A, 8B, wherein the acoustic signal generator 2 is exposed to the first test atmosphere for a defined period of time,and subsequent triggering of a first acoustic signal (warning signal) generated by the acoustic signal generator 2 with a first sound pressure level under the first test atmosphere and detection and / or recording of the first acoustic signal (warning signal) generated by the acoustic signal generator 2, in particular the first sound pressure level of the first acoustic signal (warning signal) generated by the acoustic signal generator 2, via the microphone 5, in particular wherein the microphone 5 is pivoted and / or rotated at least temporarily during detection and / or recording in the reverberation chamber; preferably wherein process step C) or the triggering of the first acoustic signal (warning signal) with the detection and / or recording of the first acoustic signal, in particular the first sound pressure level, is repeated, in particular to generate a (statistical) mean value for the first sound pressure level measurement value, step C. D) Setting of second,preferably environmental stress conditions different from the first environmental stress conditions, in particular stress conditions, in the reverberation chamber 3 to generate a second test atmosphere via the ventilation opening 8A, 8B, wherein the acoustic signal generator 2 is exposed to the second test atmosphere for a defined period of time, and subsequently (i) either triggering a second acoustic signal (warning signal) generated by the acoustic signal generator 2 with a second sound pressure level under the second test atmosphere and detecting and / or recording the second acoustic signal (warning signal) generated by the acoustic signal generator 2, in particular the second sound pressure level of the second acoustic signal (warning signal) generated by the acoustic signal generator 2, via the microphone 5,in particular wherein the microphone 5 is pivoted and / or rotated at least temporarily during the detection and / or recording in the reverberation chamber; (ii) or (re-)setting of initial environmental stress conditions in the reverberation chamber 3 to generate a first test atmosphere via the ventilation opening 8A, 8B, wherein the acoustic signal generator 2 is exposed to the first test atmosphere for a defined period of time, and subsequent triggering of a second acoustic signal (warning signal) generated by the acoustic signal generator 2 with a second sound pressure level below the first test atmosphere and detection and / or recording of the second acoustic signal (warning signal) generated by the acoustic signal generator 2, in particular the second sound pressure level of the second acoustic signal (warning signal) generated by the acoustic signal generator 2, via the microphone 5,in particular wherein the microphone 5 is pivoted and / or rotated at least temporarily during the acquisition and / or recording in the reverberation chamber; preferably wherein process step D) or the triggering of the second acoustic signal (warning signal) is repeatedly carried out with the acquisition and / or recording of the second acoustic signal, in particular the second sound pressure level, in particular to generate a (statistical) mean value for the second sound pressure level measurement value, step DE) comparison and / or alignment of the measured values ​​determined in process steps C) and D), in particular acoustic, in particular sound pressure level measurements, preferably in correlation with the specified requirements, step E., Overall, the present invention provides an efficient concept for a functional test of an acoustic signal generator 2, in particular in accordance with standards and / or in a standardized manner, wherein the concept according to the invention particularly comprises a test device 1 for the functional test of an acoustic signal generator, in particular in accordance with standards and / or in a standardized manner, wherein its uses or applications in this regard as well as a corresponding method or test method are also provided. Further embodiments, modifications, variations, special features and advantages of the present invention are readily apparent and achievable for the person skilled in the art when reading the description, without the person skilled in the art having to leave the scope of the invention. The present invention is further illustrated by the following exemplary embodiments, which, however, are not intended to limit the present invention in any way. EXAMPLES OF EXECUTION: 1. Design of the reverberation chamber For the construction of the reverberation chamber, wooden panels (wood composite) are joined together to form a box-shaped chamber using recognized carpentry joints, supplemented by a suitable waterproof adhesive or appropriate screws. The screw connections must not damage the functional surfaces in the form of splintering, warping, or holes. The reverberation chamber can be opened and closed via doors on two sides or end walls. The end walls of the reverberation chamber are each equipped with a ventilation opening with a cutout of 100 mm in diameter and a fan behind it for automated ventilation. The sound absorption coefficient of the composite panels or chamber walls according to DIN EN ISO 10534-2 is α = 0.01% (1%). LAMIPLEX® Birch Multiplex 30 mm is used as the composite panels or chamber walls. The most relevant properties of the reverberation chamber or test setup are summarized in the following table: a100 mm hole diameter σ0.20 % perforation ratio l031.6 mm material thickness c343.2 m / s air (conveyor) velocity S7849 mm 2-hole surface / hole cutout V1.4335 m³ Internal volume of the hall chamber ρ1.2041 kg / m³ Density of air Z0412 Ns / m 3 Acoustic impedance air Furthermore, dimensions of x = 1.385 m, y = 0.9 m and z = 1.15 m are chosen for the reverberation chamber, with a cuboid design. The test device according to the invention of the exemplary embodiment is shown schematically in the figures shown in Fig. 1A, Fig. 2, Fig. 3 and Fig. 4 and has been previously described in connection with these figures. The procedure carried out within the framework of the test according to the invention is shown schematically in Fig. 5 and has been previously described in connection with this figure. The advantages and special features associated with the device and method according to the invention have been described in detail in the general description, so that reference can be made to these explanations to avoid repetition. 2. Sound absorption coefficient of the test device or reverberation chamber according to the invention Assuming the maximum permissible absorption coefficient according to the standard of 0.06 (6%) and the areas of the respective chamber walls, a maximum equivalent absorption area of ​​0.4649 m2 results. 3. Testing of acoustic signal transmitters with the test device according to the invention or according to the test method provided according to the invention. The following describes, by way of example, the testing of acoustic signal transmitters using the test device according to the invention or according to the test method provided for in the invention. The test is preferably carried out in a standardized manner or in accordance with standards, in particular according to DIN EN 54-3. Assuming that the perforated sections absorb 100% of the sound energy and that the surface of the chamber walls otherwise has an absorption coefficient of 0.01, an equivalent absorption area of ​​0.0930 m² results with two perforated sections, each having a diameter of 100 mm. Taking into account the equivalent absorption area with six walls without cutouts, the maximum permissible absorption area for six walls with two holes is 0.3874 m2. As a result, the reverberation chamber according to the invention thus meets the upper limit of the percentage absorption coefficient of 6% specified in the standard. 3.1 Test setup First, it is checked that the volume of the test object or the acoustic signal generator does not occupy a certain volume fraction of the total internal volume of the reverberation chamber. The signal generator to be tested is then mounted on an end wall inside the reverberation chamber and connected to a power supply. A temperature sensor is attached to the signal generator at a suitable location so that the sound output is not affected. The desired tone is then set according to the signal generator's data sheet. The microphone is attached to a chamber wall opposite the test specimen. The minimum distance between the test specimen and the microphone or microphone assembly must not exceed a certain value, in this case 0.755 m. The microphone is connected to a stepper motor with planetary gears and a stepper motor controller. A sound level meter (2260 Investigator) is also used. To facilitate air exchange between the reverberation chamber and the environment, air inside the chamber is exchanged with the surroundings during temperature stress testing using two fans. The fans used are type 9GT0924P1 M001, with a volume flow rate of 3.27 m³ per minute per fan and a circulation rate of 2.28 m³ per minute of the chamber's internal volume. 3.2 Test procedure The microphone is calibrated with a Class 1 calibrator - 4 dB / 1 kHz and 114 dB / 1 kHz. In addition, it is checked that the stepper motor or microphone swivel device makes a complete 360° rotation and returns to the home position. In addition, the power supply is prepared and the supply voltage or current limit is set on the power supply unit and measured with multimeters. The end walls are then brought into a closed position using snap fasteners so that the installation of the lid is not hindered. For this purpose, an end wall is held by carrying handles and inserted into a groove. The test device is then placed in a climate chamber. Within the climate chamber, the environmental stress conditions or test atmosphere to be tested are established. Additionally, air supply systems (fans) located on the reverberation chamber are activated, so that the interior of the reverberation chamber is supplied with the test atmosphere present in the climate chamber. Once the stress temperature is reached, the temperature of the test specimen is measured. The environmental stress condition for dry heat testing of a Type A signal transmitter is set to a temperature of (55 ± 2) °C for a duration of 60 hours. Type A signal transmitters can be used indoors and are designed accordingly. Except during the last 15 minutes of use, the equipment requiring a power supply while in standby mode is monitored to check for any malfunctions, including alarms or fault messages, during the usage period. The sound pressure level is measured during the last 15 minutes of the stress. The sound pressure level of the acoustic signaling device is then measured again after the recovery period specified in DIN EN 60068-2:200 7. The acoustic signaling device meets the requirements of this section if: - no faulty operating procedures are detected during the stress period and - the delta sound pressure level between the measurements during the stress period and after the recovery period and the measurements during the sample variation test for one and the same test specimen is at most 6 decibels. 3.3 Sample variation For the purpose of sample variation, it is checked whether the sound output values ​​of the acoustic signal transmitters do not vary impermissibly from one test specimen to another; furthermore, sound output data are recorded for comparison with sound levels measured during and / or after the environmental tests specified in the standard DIN EN 54-3. For this purpose, A-weighted sound pressure levels of all test specimens are measured in the reverberation chamber. Standard climate conditions according to DIN EN 60068-1:1994 are established in the reverberation chamber. For each test object, the measurement result is recorded in decibels, and the sound pressure level of the loudest and quietest test object is denoted as Lx and Ly, respectively. The acoustic signal generator meets the requirements if the difference between Lx and Ly is less than 6 decibels. For the purpose of determining sample variation, eight test specimens of acoustic signal transmitters of type A are measured. 4. Comparison to the test with manual displacement of the chamber wall for the purpose of adjusting environmental stress Instead of the test device according to the invention, comparative tests are carried out in a test device with a reverberation chamber without ventilation openings, such that the reverberation chamber must be moved into the climate chamber by a person commissioned with the test to subject it to the environmental stress conditions. During the setting of the environmental stress conditions, at least one chamber wall of the reverberation chamber is kept open to adjust the test atmosphere inside the chamber. The chamber wall is only closed by the tester during the final 15 minutes of the stress test. For this purpose, the tester slowly opens the door to the climate chamber and immediately closes it again after entering. After a further 5 minutes in the climate chamber, the reverberation chamber is closed again (by carefully sealing the chamber wall) and the sound level measurement is carried out again. On this basis it is not possible to implement the environmental stress conditions specified in DIN EN 54-3 in a user-friendly manner and in compliance with occupational safety requirements. Furthermore, it has proven problematic to precisely adjust the test atmosphere inside the reverberation chamber to prevent any deviations between the chamber's interior and the ambient air. Opening and closing the chamber itself introduces fluctuations in the test atmosphere, making precise adjustment difficult. This can potentially distort the environmental conditions inside the chamber, which can affect sound pressure level measurements. A further problem has been found to be that the person performing the test, who has to open and close the reverberation chamber wall for the purpose of adjusting the environmental stress conditions, has to take very careful care to ensure that there is no collision with the swiveling microphone when opening or closing, and that the positioning is exact and sealed in relation to the adjacent chamber walls. Testing signal type B under dry heat and cold conditions has proven particularly problematic, as the standard requires environmental stress conditions of 70 °C and -25 °C, respectively. The resulting strain on the tester inside the climate chamber is often impossible, or only achievable with considerable effort, to comply with occupational safety requirements. REFERENCE MARK LIST: 1 Test device 2 Signal transmitter 3 Reverberation chamber 4 Chamber wall 4A First chamber wall 4B Second chamber wall 5 Microphone 6 Microphone holder 7 Test specimen holder 8 Air opening 8A First air opening 8B Second air opening 9 Air supply unit 9A First air supply unit 9B Second air supply unit 10 Shut-off device 11 Microphone traverse 12 Signal processing unit 13 Microphone swivel device 14 Control unit QUOTES INCLUDED IN THE DESCRIPTION This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature EP 1 798 699 A1

[0026] DE 10 2012 215 212 A1

[0027] Cited non-patent literature DIN EN 54-3 [0002, 0003, 0004, 0005, 0010, 0011, 0013, 0014, 0016, 0017, 0018, 0020, 0022, 0025, 0026, 0027, 0028, 0030, 0031, 0033, 0034, 0035, 0036, 0044, 0052, 0063, 0066, 0067, 0070, 0077, 0081, 0082, 0083, 0108, 0110, 0123, 0126, 0132, 0134, 0152, 0166, 0185, 0191]DIN EN 54-3: 2019-11

[0010] ISO 7731

[0010] ISO 8201:87

[0012] DIN EN 54-3

[0020] DIN EN 54-3:2014+A1:2019

[0068] DIN EN 54-3:2014-09

[0068] DIN EN ISO 10534-2

[0159] DIN EN 60068-2:200

[0183] DIN EN 60068-1:1994

[0186]

Claims

Test device (1) for the functional testing, in particular in accordance with standards and / or standards, of an acoustic signal generator (2), in particular an acoustic signal generator (2) of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator (2), wherein the test device (1) comprises: - a reverberation chamber (3), in particular a box-shaped reverberation chamber, in particular wherein the reverberation chamber (3) comprises a plurality of chamber walls (4), in particular six chamber walls (4), and / or is composed of a plurality of chamber walls (4), in particular six chamber walls (4), preferably wherein the reverberation chamber (3) is bounded and / or formed by the chamber walls (4), - a device arranged in the reverberation chamber (3),preferably pivotably and / or rotatably mounted and / or attached, microphone (5) for detecting and / or recording an acoustic signal (warning signal) generated by the acoustic signal generator (2), in particular for detecting and / or recording a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator (2), in particular wherein the microphone (5) is arranged and / or attached and / or mounted on a chamber wall (4) of the reverberation chamber (3) by means of a microphone holding device (6), in particular pivotably and / or rotatably, - a test specimen holder (7) arranged in the reverberation chamber (3) for holding and / or receiving an acoustic signal generator (test specimen) (2) to be tested, in particular wherein the test specimen holder (7) is attached to a chamber wall (4), preferably to a chamber wall (4) opposite the microphone (5),preferably arranged and / or attached to one of the chamber walls (4) opposite the microphone holding device (6) for the microphone (5); wherein at least one ventilation opening (8A, 8B), preferably a perforation, is arranged and / or provided on and / or in at least one chamber wall (4), in particular for the preferably defined and / or predetermined inlet and / or outlet of air, preferably test atmosphere, into and / or out of the reverberation chamber (3) and / or in particular for the preferably defined and / or predetermined setting of environmental stress conditions in the reverberation chamber (3). Test device according to claim 1, wherein the ventilation opening(s) (8A, 8B), in particular the cross-sectional area(s) of the ventilation opening(s) (8A, 8B), is / are dimensioned such that the acoustic properties, in particular the sound absorption area, of the reverberation chamber (3) are at least substantially unchanged and / or that the acoustic properties, in particular the sound absorption area, of the reverberation chamber (3) are compliant with standards and / or meet the requirements according to DIN EN 54-3; and / or wherein the ventilation opening(s) (8A, 8B), in particular the cross-sectional area(s) of the ventilation opening(s) (8A, 8B), is / are dimensioned such that the sound absorption coefficient of the inside of the chamber wall(s) (4) provided with the ventilation opening(s) (8A, 8B) is at most 0.06, in particular within the test frequency band, preferably in the range of 450 Hz (Hertz) to 3.150 Hz; and / or wherein the ventilation opening(s) (8A, 8B), in particular the cross-sectional area(s) of the ventilation opening(s) (8A, 8B), is / are dimensioned such that the perforation ratio, calculated as the ratio of the cross-sectional area(s) of the ventilation opening(s) (8A, 8B) to the sum of the inner surfaces of all chamber walls (4), is at most 0.05 and / or that the perforation ratio, calculated as the ratio of the cross-sectional area(s) of the ventilation opening(s) (8A, 8B) to the sum of the inner surfaces of all chamber walls (4), varies in the range of 0.001 to 0.05, in particular in the range of 0.002 to 0.05, preferably in the range of 0.003 to 0.

05. Test apparatus according to claim 1 or claim 2, wherein the ventilation opening(s) (8A, 8B) is / are provided and / or equipped with an air conveying device (9), in particular with a fan and / or blower, in particular for the preferably defined and / or predetermined inlet and / or outlet of air, preferably test atmosphere, into and / or out of the reverberation chamber (3) and / or in particular for the preferably defined and / or predetermined setting of environmental stress conditions in the reverberation chamber (3); in particular wherein the air conveying device (9) is designed such that an air volume flow in the range of 0.1 times to 10 times, in particular in the range of 0.2 times to 5 times, preferably in the range of 0.5 times to 3 times, of the volume of the reverberation chamber (3) can be conveyed per minute, in particular into and / or out of the reverberation chamber (3). Test apparatus according to one of the preceding claims, wherein at least one first ventilation opening (8A), preferably a first opening, in particular for the preferably defined and / or predetermined inlet of air, preferably test atmosphere, into the reverberation chamber (3) is arranged and / or formed and / or provided on and / or in a first chamber wall (4A), and wherein at least one second ventilation opening (8B), preferably a second opening, in particular for the preferably defined and / or predetermined outlet of air, preferably test atmosphere, from the reverberation chamber (3) is arranged and / or formed and / or provided on and / or in a second chamber wall (4B), in particular different from the first chamber wall (4A) and / or preferably opposite the first chamber wall (4A);in particular wherein the first ventilation opening (8A) and the second ventilation opening (8B) are arranged and / or designed and / or interact for the preferably defined and / or predetermined setting of environmental stress conditions in the hall chamber (3). Test device (1) for the functional testing, in particular in accordance with standards and / or standards, of an acoustic signal generator (2), in particular an acoustic signal generator (2) of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator (2), in particular test device (1) according to one of the preceding claims, wherein the test device (1) comprises: - a reverberation chamber (3), in particular a box-shaped reverberation chamber, in particular wherein the reverberation chamber (3) comprises a plurality of chamber walls (4), in particular six chamber walls (4), and / or is composed of a plurality of chamber walls (4), in particular six chamber walls (4), preferably wherein the reverberation chamber (3) is bounded and / or formed by the chamber walls (4),- a microphone (5) arranged in the reverberation chamber (3), preferably pivotably and / or rotatably mounted and / or attached, for detecting and / or recording an acoustic signal (warning signal) generated by the acoustic signal generator (2), in particular for detecting and / or recording a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator (2), in particular wherein the microphone (5) is arranged and / or attached and / or mounted on a chamber wall (4) of the reverberation chamber (3), preferably by means of a microphone holding device (6), in particular pivotably and / or rotatably, - a test specimen holder (7) arranged in the reverberation chamber (3) for holding and / or receiving an acoustic signal generator (test specimen) (2) to be tested, in particular wherein the test specimen holder (7) is attached to a chamber wall (4), preferably to a chamber wall (4) opposite the microphone (5),preferably arranged and / or attached to a chamber wall (4) opposite the microphone holding device (6) for the microphone (5); wherein at least one first ventilation opening (8A), preferably a first opening, in particular for the preferably defined and / or predetermined inlet of air, preferably test atmosphere, into the reverberation chamber (3), is arranged and / or formed and / or provided on and / or in a first chamber wall (4A); and wherein at least one second ventilation opening (8B), preferably a second opening, in particular for the preferably defined and / or predetermined outlet of air, preferably test atmosphere, is arranged and / or formed and / or provided on and / or in a second chamber wall (4B), in particular different from the first chamber wall and / or preferably opposite the first chamber wall (4A).from the reverberation chamber (3) arranged and / or designed and / or provided; in particular wherein the first ventilation opening (8A) and the second ventilation opening (8B) are arranged and / or designed and / or interact for the preferably defined and / or predetermined setting of environmental stress conditions in the reverberation chamber (3). Test apparatus according to claim 4 or claim 5, wherein the first and second ventilation openings (8A, 8B), in particular the (summed) cross-sectional areas of the first and second ventilation openings (8A, 8B), are dimensioned such that the acoustic properties, in particular the sound absorption area, of the reverberation chamber (3) are at least substantially unchanged and / or that the acoustic properties, in particular the sound absorption area, of the reverberation chamber (3) are compliant with standards and / or meet the requirements according to DIN EN 54-3; and / or wherein the first and second ventilation openings (8A, 8B), in particular the (sum) cross-sectional areas of the first and second ventilation openings (8A, 8B), are dimensioned such that the sound absorption coefficient of the inside of the chamber walls (4A, 4B) provided with the first and second ventilation openings (8A, 8B) is at most 0.06, in particular within the test frequency band, preferably in the range of 450 Hz (Hertz) to 3.150 Hz; and / or wherein the first and second ventilation openings (8A, 8B), in particular the (sum) cross-sectional areas of the first and second ventilation openings (8A, 8B), are dimensioned such that the perforation ratio, calculated as the ratio of the (sum) cross-sectional areas of the first and second ventilation openings (8A, 8B) to the sum of the inner surfaces of all chamber walls (4), is at most 0.05 and / or that the perforation ratio, calculated as the ratio of the (sum) cross-sectional areas of the first and second ventilation openings (8A, 8B) to the sum of the inner surfaces of all chamber walls (4), varies in the range of 0.001 to 0.05, in particular in the range of 0.002 to 0.05, preferably in the range of 0.003 to 0.

05. Test device according to one of claims 4 to 6, wherein the first ventilation opening (8A) is provided and / or equipped with a first air conveying device (9A), in particular with a fan and / or blower, for the preferably defined and / or predetermined inlet of air, preferably test atmosphere, and / or, preferably, and, wherein the second ventilation opening (8B) is provided and / or equipped with a second air conveying device (9B), in particular with a fan and / or blower, for the preferably defined and / or predetermined outlet of air, preferably test atmosphere, from the reverberation chamber (3);in particular wherein the first and / or second air conveying device (9A, 9B) is / are designed such that an air volume flow in the range of 0.1 to 10 times, in particular in the range of 0.2 to 5 times, preferably in the range of 0.5 to 3 times, the volume of the reverberation chamber (3) can be conveyed per minute, in particular into and / or out of the reverberation chamber (3). Test device according to one of claims 4 to 7, wherein the first ventilation opening (8A) and the second ventilation opening (8B) are arranged and / or aligned vertically and / or horizontally offset from each other, preferably vertically and horizontally offset from each other, preferably diagonally offset from each other, preferably on two opposite chamber walls (4A, 4B), preferably on two opposite end chamber walls (end faces); and / or wherein the first ventilation opening (8A) and the second ventilation opening (8B) preferably have at least substantially the same cross-sectional area and / or the same cross-sectional shape. Test apparatus according to one of the preceding claims, wherein the chamber walls (4) are connected to each other at least substantially in a soundproof manner and / or at least substantially in an airtight manner and form and / or limit the reverberation chamber (3). Test apparatus according to one of the preceding claims, wherein the Hall chamber (3) has two opposing end chamber walls (end walls) as first and second chamber walls (4A, 4B) and preferably four base chamber walls connecting the end chamber walls as chamber walls (4) and / or is formed therefrom. Test device according to one of the preceding claims, wherein the ventilation opening(s) (8A, 8B) is / are arranged and / or formed on and / or in at least one end chamber wall (end wall); and / or wherein the first ventilation opening (8A) is arranged and / or formed on a first chamber wall (4A), preferably end chamber wall (end wall), and the second ventilation opening (8B) is arranged and / or formed on a second chamber wall (4B), preferably opposite the first end chamber wall (end wall). Test apparatus according to one of the preceding claims, wherein the reverberation chamber (3) has a chamber volume, in particular chamber internal volume, in cubic meters (m3) in the range of 0.5 m3 to 5 m3, in particular in the range of 0.6 m3 to 3 m3, preferably in the range of 0.7 m3 to 2 m3; and / or wherein the chamber volume, in particular chamber internal volume, of the reverberation chamber (3) in cubic meters (m3) is selected such that the volume of the test specimen is at most 5% of the chamber volume of the reverberation chamber (3); and / or wherein the chamber volume, in particular chamber internal volume, of the reverberation chamber (3) in cubic meters (m3) is not less than 0.5 or not less than 125 × 106 / f3, wherein 90% of the sound power in the reverberation chamber (3) lies at frequencies above f, the larger value being selected. Test device according to one of the preceding claims, wherein the reverberation chamber (3) is designed to be reversibly openable and closeable on at least one side, in particular for inserting and / or removing an acoustic signal generator (test object) (2) to be tested into and / or from the reverberation chamber (3); and / or wherein the reverberation chamber (3) has at least one reversibly closable chamber wall (4), in particular an end chamber wall (end wall), in particular for inserting and / or removing an acoustic signal generator (test object) (2) to be tested into and / or from the reverberation chamber (3); and / or wherein at least one chamber wall (4), in particular an end chamber wall (end wall), is arranged and / or designed to be removable and / or pivotable, in particular pivotable, for opening and / or closing the reverberation chamber (3), in particular for inserting and / or removing an acoustic signal transmitter (test specimen) (2) to be tested into and / or out of the reverberation chamber (3);and / or wherein two, preferably opposing, chamber walls (4A, 4B), in particular two opposing end chamber walls (end walls), are arranged and / or designed to be removable and / or pivotable, in particular pivotable, for opening and / or closing the reverberation chamber (3), in particular for inserting and / or removing an acoustic signal transmitter (test specimen) (2) to be tested into and / or from the reverberation chamber (3). Test device according to one of the preceding claims, wherein at least one chamber wall (4), in particular an end chamber wall (end wall), is preferably at least substantially soundproof and / or preferably at least substantially airtight, and is closable; in particular wherein the closable chamber wall (4), in particular end chamber wall (end wall), has at least one releasable closure device (10), preferably for at least substantially soundproof and / or preferably for at least substantially airtight closure of the reverberation chamber (3);preferably wherein the locking device (10) is designed as a, in particular, one- or multi-part clamping locking system, preferably consisting of a plurality of similar locking devices and / or preferably wherein the locking device (10) comprises a plurality of locking devices distributed, in particular, on the periphery, preferably circumferentially, on the chamber wall (4), in particular the end chamber wall (end wall) (4A, 4B). Test device according to one of the preceding claims, wherein the microphone (5) and / or the microphone holding device (6) is / are arranged on a chamber wall (4A), preferably a first end chamber wall (end wall); and / or wherein the test specimen holder (7) is / are arranged and / or formed on a second chamber wall (4B), preferably a second end chamber wall; and / or wherein the microphone (5) and / or the microphone holding device (6) on the one hand and the test specimen holder (7) on the other hand are arranged and / or formed on opposite chamber walls (4), in particular opposite end chamber walls (end walls) (4A, 4B). Test device according to one of the preceding claims, wherein the microphone (5) is pivotably and / or rotatably arranged and / or attached and / or mounted on a chamber wall (4), preferably end chamber wall (end wall), of the reverberation chamber (3) on a circular path with a diameter of at least 100 mm, preferably at least 200 mm, in particular at least 300 mm. Test device according to one of the preceding claims, wherein the microphone (5) is arranged and / or attached and / or mounted in the reverberation chamber (3) in a pivot plane on the chamber wall (4), preferably end wall (front wall), of the reverberation chamber (3), in particular by means of a microphone holding device (6), preferably by means of a microphone traverse (11) of the microphone holding device (6); in particular wherein the pivot plane is inclined to at least one chamber wall (4), preferably to at least two opposite end walls (front walls), in particular inclined by an angle of inclination of more than 10°;and / or, in particular, wherein the microphone holding device (6) comprises a microphone traverse (11), wherein the microphone (5) is arranged and / or held and / or attached to the microphone traverse (11), preferably wherein the microphone traverse (11) is inclined towards at least one chamber wall (4), preferably towards two opposing end chamber walls (end walls), in particular inclined by more than 10°; and / or, in particular, wherein no point of the microphone traverse (11) is closer than λ / 4 (lambda / 4) to at least one, preferably each, chamber wall, preferably wherein λ (lambda) is the wavelength of the lowest frequency range to be examined of the acoustic signal generated by the signal generator. Test device according to one of the preceding claims, wherein the distance between the microphone (5), in particular with respect to each pivot position of the microphone (5) in the reverberation chamber (3), and the test specimen holder (7) is more than 0.2 V1 / 3, in particular more than 0.25 V1 / 3, preferably more than 0.3 V1 / 3, where V corresponds to the (internal) volume of the reverberation chamber (3) (m3). Test device according to one of the preceding claims, wherein the test device (1) comprises at least one signal processing device (12) connected to and / or associated with the microphone (5), in particular a sound (pressure) level measuring device, in particular for measuring the sound pressure level recorded by the microphone (5) by means of the acoustic signal generated by the signal transmitter. Test device according to one of the preceding claims, wherein the microphone (5) and / or the microphone holding device (6) is automatically and / or automatically pivotable and / or rotatable, particularly during the functional test, and / or wherein the microphone (5) and / or the microphone holding device (6) is automatically and / or automatically pivoted and / or rotated, particularly during the functional test, preferably by means of a microphone swivel device (13) connected to and / or associated with the microphone (5) and / or the microphone holding device (6); in particular wherein the microphone swivel device (13) is controlled and / or controllable by means of a control device (14). Test apparatus according to one of the preceding claims, wherein the reverberation chamber (3) has six chamber walls (4) which are designed and / or aligned with each other such that either no surfaces of the chamber walls (4) run parallel, preferably wherein the angles of inclination between adjacent chamber walls (4) are designed such that resonances are reduced to a minimum and the maximum length, width and height of the chamber walls are the same, or wherein the reverberation chamber (4) is designed in a rectangular and / or cuboid shape, in particular with three different side lengths x, y and z;in particular wherein the ratio of the side length y / x is in the range of 0.6 to 1.0, particularly in the range of 0.7 to 0.9, preferably in the range of 0.75 to 0.85, particularly preferably in the range of 0.79 to 0.83, and the ratio of the side length z / x is in the range of 0.3 to 0.7, preferably in the range of 0.4 to 0.7, particularly in the range of 0.45 to 0.65, particularly preferably in the range of 0.47 to 0.

63. Test apparatus according to one of the preceding claims, wherein the chamber walls (4) have at least substantially the same sound reflection and / or at least substantially the same sound absorption coefficient, in particular a sound absorption coefficient of at most 0.06; and / or wherein each chamber wall (4) has a sound absorption coefficient of at most 0.

06. Test apparatus according to one of the preceding claims, wherein the chamber wall(s) comprises or consist of at least a laminated material and / or a wood material, in particular a wood-based laminated material; in particular wherein at least one chamber wall (4), preferably each chamber wall (4), comprises or consists of a laminated material and / or a wood material, in particular a wood-based laminated material. Test device according to one of the preceding claims, wherein the chamber wall(s) (4), preferably each chamber wall (4), has a thickness of at least 15 mm, in particular at least 20 mm, preferably at least 25 mm; and / or wherein the chamber wall(s) (4), preferably each chamber wall (4), has a thickness in the range of 10 V1 / 3 to 30 V1 / 3, in particular in the range of 15 V1 / 3 to 25 V1 / 3, in particular in the range of 20 V1 / 3 to 25 V1 / 3, wherein V corresponds to the (internal) volume of the reverberation chamber (3) (m3). Test device according to one of the preceding claims, wherein the environmental stress conditions are selected from the group consisting of temperature, (air) humidity, pressure, corrosion stress and their combinations, in particular from the group consisting of temperature, (air) humidity, pressure and their combinations. Test apparatus according to any one of the preceding claims, wherein the environmental stress conditions are selected from the group consisting of (i) thermal test conditions, wherein the temperature in the reverberation chamber during the thermal test condition is set to a defined temperature from the range of 38 °C to 90 °C, preferably to 40 °C to 80 °C, particularly to 45 °C to 70 °C; and / or (ii) cold test conditions, wherein the temperature in the reverberation chamber during the cold test condition is set to a defined temperature from the range of -40 °C to 0 °C, preferably to -30 °C to -5 °C, particularly to -25 °C to -10 °C; and / or (iii) humidity conditions, wherein the (air) humidity in the reverberation chamber during the humidity test is set to a defined humidity from the range of 80% to 98%, preferably to 85% to 95%, particularly to 90% to 95%;and / or (iv) corrosion resistance test conditions, wherein the sulfur dioxide content in the Hall chamber during the corrosion resistance test is adjusted to a value in the range of 10 µl / l to 50 µl / l, in particular to 15 µl / l to 40 µl / l, preferably to 20 µl / l to 30 µl / l; and any combination thereof. Test apparatus according to one of the preceding claims, wherein the environmental stress conditions comprise a combination of predetermined and / or defined values ​​of temperature and (air) humidity and, optionally, pressure. Test device according to one of the preceding claims, wherein the test device (1) is configured such that a functional test can be performed within a test frequency band in the range of 450 Hz (Hertz) to 3,150 Hz; and / or wherein the test device (1) is configured such that a functional test can be performed within a test frequency band, in particular in the range of 450 Hz (Hertz) to 3,150 Hz, with an accuracy and / or reliability of at least ± 2 dB (decibels), in particular with an accuracy and / or reliability of at least ± 1.5 dB, preferably with an accuracy and / or reliability in the range of ± (0.5 to 2) dB, in particular with regard to a single value measurement. Test device according to one of the preceding claims, wherein the test device (1) is configured for carrying out a test procedure for the functional testing of an acoustic signal generator (2), in particular an acoustic signal generator (2) of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator (2), in particular with and / or using a test device (1) according to one of the preceding claims, wherein the following procedure steps are carried out, in particular in the (temporal) sequence of procedure steps specified below: A) Provision of a reverberation chamber (3), in particular a reverberation test chamber, in particular a box-shaped reverberation chamber,in particular wherein the reverberation chamber (3) has a plurality of chamber walls (4), in particular six chamber walls (4), and / or is composed of a plurality of chamber walls (4), in particular six chamber walls (4), preferably wherein the reverberation chamber (3) is bounded and / or formed by the chamber walls (4), with a microphone (5) arranged in the reverberation chamber (3), preferably pivotably and / or rotatably mounted and / or attached, for detecting and / or recording an acoustic signal (warning signal) generated by the acoustic signal generator (2), in particular for detecting and / or recording a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator (2); in particular wherein the microphone (5) is preferably pivotably and / or rotatably mounted by means of a microphone holding device (6),a chamber wall (4) of the reverberation chamber (3) and / or attached and / or mounted; - a test specimen holder (7) arranged in the reverberation chamber (3) for holding and / or receiving an acoustic signal transmitter (test specimen) (2) to be tested; in particular wherein the test specimen holder (7) is arranged and / or attached to a chamber wall (4), preferably to a chamber wall (4) opposite the microphone (5), preferably to a chamber wall (4) opposite the microphone holding device (6) for the microphone (5); - at least one ventilation opening (8A, 8B), preferably a perforation, in particular for the preferably defined and / or predetermined inlet and / or outlet of air, preferably test atmosphere, arranged and / or formed and / or provided on and / or in at least one chamber wall (4).into and / or out of the reverberation chamber (3) and / or, in particular, for the preferably defined and / or predetermined setting of environmental stress conditions in the reverberation chamber (3); arranged and / or designed and / or provided; B) Arranging an acoustic signal generator (test specimen) (2) to be tested in the reverberation chamber (3), preferably on the test specimen holder (7); C) Setting of first environmental stress conditions, in particular normal and / or standard conditions, in the reverberation chamber (3) to generate a first test atmosphere via the ventilation opening (8A, 8B), wherein the acoustic signal generator (2) is exposed to the first test atmosphere for a defined period of time, and subsequent triggering of a first acoustic signal (warning signal) generated by the acoustic signal generator (2) with a first sound pressure level below the first test atmosphere and detection and / or recording of the first acoustic signal (warning signal) generated by the acoustic signal generator (2),in particular the first sound pressure level of the first acoustic signal (warning signal) generated by the acoustic signal generator (2), via the microphone (5), in particular wherein the microphone (5) is pivoted and / or rotated at least temporarily during the detection and / or recording in the reverberation chamber; preferably wherein process step C) or the triggering of the first acoustic signal (warning signal) is carried out repeatedly with the detection and / or recording of the first acoustic signal, in particular the first sound pressure level, in particular to generate a (statistical) mean value for the first sound pressure level measurement; D) setting of second environmental stress conditions, preferably different from the first environmental stress conditions, in particular load conditions, in the reverberation chamber (3) to generate a second test atmosphere via the ventilation opening (8A, 8B),wherein the acoustic signal generator (2) is exposed to the second test atmosphere for a defined period of time, and subsequently (i) either triggering a second acoustic signal (warning signal) generated by the acoustic signal generator (2) with a second sound pressure level under the second test atmosphere and detecting and / or recording the second acoustic signal (warning signal) generated by the acoustic signal generator (2), in particular the second sound pressure level of the second acoustic signal (warning signal) generated by the acoustic signal generator (2), via the microphone (5), in particular wherein the microphone (5) is pivoted and / or rotated at least temporarily during detection and / or recording in the reverberation chamber; (ii) or (re-)setting first environmental stress conditions in the reverberation chamber (3) to generate a first test atmosphere via the ventilation opening (8A, 8B),wherein the acoustic signal generator (2) is exposed to the first test atmosphere for a defined period of time, and subsequently triggering a second acoustic signal (warning signal) generated by the acoustic signal generator (2) with a second sound pressure level under the first test atmosphere, and capturing and / or recording the second acoustic signal (warning signal) generated by the acoustic signal generator (2), in particular the second sound pressure level of the second acoustic signal (warning signal) generated by the acoustic signal generator (2), via the microphone (5), in particular wherein the microphone (5) is pivoted and / or rotated at least temporarily during the capture and / or recording in the reverberation chamber; preferably wherein process step D) or the triggering of the second acoustic signal (warning signal) with the capture and / or recording of the second acoustic signal, in particular the second sound pressure level, is repeated.in particular for generating a (statistical) mean value for the second sound pressure level measurement; E) Comparison and / or alignment of the measured values ​​determined in process steps C) and D), in particular acoustic, especially sound pressure level measurements, preferably in correlation with the specified requirements. Test device according to one of the preceding claims, wherein the test device (1) is configured for carrying out a test procedure for the functional testing of an acoustic signal generator (2), in particular an acoustic signal generator (2) of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator (2), with and / or using a test device (1) according to one of the preceding claims, wherein the following procedure steps are carried out, in particular in the (temporal) sequence of procedure steps specified below: A) Provision of a test device (1) according to one of the preceding claims;B) Arranging an acoustic signal generator (test object) (2) to be tested in the reverberation chamber (3), preferably on the test object holder (7);C) Setting initial environmental stress conditions, in particular normal and / or standard conditions, in the reverberation chamber (3) to generate a first test atmosphere via the ventilation opening (8A, 8B), wherein the acoustic signal generator (2) is exposed to the first test atmosphere for a defined period of time, and subsequent triggering of a first acoustic signal (warning signal) generated by the acoustic signal generator (2) with a first sound pressure level below the first test atmosphere and detection and / or recording of the first acoustic signal (warning signal) generated by the acoustic signal generator (2), in particular the first sound pressure level of the first acoustic signal (warning signal) generated by the acoustic signal generator (2), via the microphone (5), in particular wherein the microphone (5) is pivoted and / or rotated at least temporarily during detection and / or recording in the reverberation chamber (3);preferably wherein process step C) or the triggering of the first acoustic signal (warning signal) is repeated with the detection and / or recording of the first acoustic signal, in particular the first sound pressure level, especially to generate a (statistical) mean value for the first sound pressure level measurement;D) Setting a second environmental stress condition, preferably different from the first environmental stress conditions, in particular stress conditions, in the reverberation chamber (3) to generate a second test atmosphere via the ventilation opening (8A, 8B), wherein the acoustic signal generator (2) is exposed to the second test atmosphere for a defined period of time, and subsequently (i) either triggering a second acoustic signal (warning signal) generated by the acoustic signal generator (2) with a second sound pressure level under the second test atmosphere and detecting and / or recording the second acoustic signal (warning signal) generated by the acoustic signal generator (2), in particular the second sound pressure level of the second acoustic signal (warning signal) generated by the acoustic signal generator (2), via the microphone (5), in particular wherein the microphone (5) is pivoted and / or rotated at least temporarily during the detection and / or recording in the reverberation chamber;(ii) or (re-)setting of initial environmental stress conditions in the reverberation chamber (3) to generate a first test atmosphere via the ventilation opening (8A, 8B), wherein the acoustic signal generator (2) is exposed to the first test atmosphere for a defined period of time, and subsequent triggering of a second acoustic signal (warning signal) generated by the acoustic signal generator (2) with a second sound pressure level below the first test atmosphere and detection and / or recording of the second acoustic signal (warning signal) generated by the acoustic signal generator (2), in particular the second sound pressure level of the second acoustic signal (warning signal) generated by the acoustic signal generator (2), via the microphone (5), in particular wherein the microphone (5) is swiveled and / or rotated at least temporarily during detection and / or recording in the reverberation chamber;preferably wherein process step D) or the triggering of the second acoustic signal (warning signal) is repeatedly carried out with the detection and / or recording of the second acoustic signal, in particular the second sound pressure level, especially to generate a (statistical) mean value for the second sound pressure level measurement; E) comparison and / or alignment of the measured values ​​determined in process steps C) and D), in particular acoustic, in particular sound pressure level measurements, preferably in correlation with the specified requirements.; Test apparatus according to one of the preceding claims, wherein the first environmental stress conditions, in particular normal and / or standard conditions, are normal climatic conditions according to EN 60068-1:1994; and / or wherein the first environmental stress conditions, in particular normal and / or standard conditions, are selected as follows: (i) temperature in the range of 15 °C to 35 °C, (ii) relative (air) humidity in the range of 25 % to 75 %, (iii) (air) pressure in the range of 86 kPa to 106 kPa. Test device according to one of the preceding claims, wherein the second environmental stress conditions, in particular load conditions, are different from the first environmental stress conditions; and / or wherein the second environmental stress conditions, in particular load conditions, are different from the first environmental stress conditions, in particular with regard to temperature, preferably wherein the temperature of the second environmental stress conditions is above the temperatures of the first environmental stress conditions, in particular above 35 °C, or preferably wherein the temperature of the second environmental stress conditions is below the temperatures of the first environmental stress conditions, in particular below 35 °C;and / or wherein the second environmental stress conditions, in particular stress conditions, are selected as follows: (i) temperature in the range below 15 °C, in particular in the range of -40 °C to 0 °C, or temperature in the range above 35 °C, in particular in the range of 38 °C to 90 °C, (ii) relative (air) humidity in the range of 25 % to 98 %, (iii) (air) pressure in the range of 86 kPa to 106 kPa.; Test apparatus according to one of the preceding claims, wherein the second environmental stress conditions, in particular stress conditions, differ from the first environmental stress conditions, wherein the second environmental stress conditions are selected from the group of (i) thermal test conditions, wherein the temperature in the Hall chamber during the thermal test condition is set to a defined temperature from the range of 38 °C to 90 °C, preferably to 40 °C to 80 °C, in particular to 45 °C to 70 °C; and / or (ii) cold test conditions, wherein the temperature in the Hall chamber during the cold test condition is set to a defined temperature from the range of -40 °C to 0 °C, preferably to -30 °C to -5 °C, in particular to -25 °C to -10 °C;and / or (iii) humidity conditions, wherein the (air) humidity in the Hall chamber during the humidity test is adjusted to a defined humidity from the range of 80% to 98%, preferably to 85% to 95%, particularly to 90% to 95%; and / or (iv) corrosion resistance test conditions, wherein the sulfur dioxide content in the Hall chamber during the corrosion resistance test is adjusted to a value from the range of 10 µl / l to 50 µl / l, particularly to 15 µl / l to 40 µl / l, preferably to 20 µl / l to 30 µl / l; and any combinations thereof. Test device according to one of the preceding claims, wherein the comparison and / or adjustment carried out in step E) is performed in such a way that, upon reaching and / or falling below a defined and / or predetermined limit value, in particular a defined and / or predetermined limit value with regard to the difference and / or deviation of the measured values ​​determined in the process steps C) and D), in particular acoustic, in particular sound pressure level measured values, a fulfillment or non-fulfillment of the functional test of the acoustic signal generator is determined;and / or wherein the comparison and / or adjustment carried out in step E) is performed in such a way that, upon reaching and / or falling below a defined and / or predetermined limit value, in particular a defined and / or predetermined limit value for a differential acoustic signal, in particular for a differential sound pressure level measurement (delta sound pressure level), the measured values ​​determined in the process steps C) and D), in particular acoustic, in particular sound pressure level measurements, a fulfillment or non-fulfillment of the functional test of the acoustic signal transmitter is determined;in particular wherein, at a limit value, in particular a defined and / or predetermined limit value with regard to the difference and / or deviation of the measured values ​​determined in process steps C) and D), in particular acoustic, in particular sound pressure level measurements, preferably at a differential acoustic signal, in particular differential sound pressure level measurement (delta sound pressure level), of at most 10 dB, preferably at most 8 dB, in particular at most 6 dB, a fulfillment of the functional test of the acoustic signal transmitter is determined, and if this limit value is exceeded by more than 10 dB, preferably more than 8 dB, in particular more than 6 dB, a failure of the functional test of the acoustic signal transmitter is determined. Test apparatus according to one of the preceding claims, wherein the setting of the first and second environmental stress conditions for generating the first and second test atmosphere is carried out via the at least one ventilation opening (8A, 8B), preferably by means of an air conveying device (9), a preferably defined and / or predetermined airflow; in particular wherein an air volume flow, in particular air volume flow of the test atmosphere, in the range of 0.1 to 10 times, in particular in the range of 0.2 to 5 times, preferably in the range of 0.5 to 3 times, of the volume of the reverberation chamber (3) is conveyed per minute, in particular into and / or out of the reverberation chamber (3). Test apparatus according to one of the preceding claims, wherein at least one first ventilation opening (8A), preferably a first opening, in particular for the preferably defined and / or predetermined inlet of air, preferably test atmosphere, into the reverberation chamber (3) is arranged and / or formed and / or provided on and / or in a first chamber wall (4), and wherein at least one second ventilation opening (8B), preferably a second opening, in particular for the preferably defined and / or predetermined outlet of air, preferably test atmosphere, from the reverberation chamber (3) is arranged and / or formed and / or provided on and / or in a second chamber wall (4B), in particular different from the first chamber wall (4A) and / or preferably opposite the first chamber wall (4A);in particular wherein the first ventilation opening (8A) and the second ventilation opening (8B) are arranged and / or designed and / or interact for the preferably defined and / or predetermined setting of environmental stress conditions in the hall chamber (3). Test apparatus according to one of the preceding claims, wherein the environmental stress conditions are set for a stress period of at least 2 hours, preferably at least 5 hours, in particular at least 10 hours, particularly preferably at least 15 hours, most preferably about 16 hours. Test device according to one of the preceding claims, wherein the method is carried out with a test device (1) which has one or more features of the test device (1) according to one of claims 1 to 27. Testing device according to one of the preceding claims, each characterized by one or more of the features of claims 1 to 28. Use of a test device (1) according to one of the preceding claims for the functional testing of an acoustic signal generator (2), in particular an acoustic signal generator (2) of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator (2). Use according to claim 40, wherein the test device (1) has one or more features of the test device (1) according to any one of claims 1 to 27. Use of a test device (1) according to one of claims 1 to 28 for carrying out a method according to one of claims 29 to 39.Use of a reverberation chamber (3), in particular as defined in one of claims 1 to 28, for the particularly standard-compliant and / or standardized functional testing of an acoustic signal generator (2), in particular an acoustic signal generator (2) of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator (2);in particular wherein different environmental stress conditions, in particular as defined above, are preferably defined and / or predetermined in the reverberation chamber (3) before and / or during the measurements, in particular by introducing and / or releasing air, preferably test atmosphere, into and / or out of the reverberation chamber (3) via at least one ventilation opening (8A, 8B), preferably a perforation, arranged and / or formed and / or provided, in particular in the chamber wall (4). Use according to claim 43, wherein a preferably defined and / or predetermined airflow, preferably test atmosphere, is admitted into and / or discharged from the reverberation chamber (3) via ventilation opening(s) (8A, 8B), preferably by means of an air conveying device (9), in particular by means of a fan and / or blower, in particular for the preferably defined and / or predetermined setting of environmental stress conditions in the reverberation chamber (3). Use according to claim 43 or 44, wherein at least one first ventilation opening (8A), preferably a first opening, in particular for the preferably defined and / or predetermined inlet of air, preferably test atmosphere, into the reverberation chamber (3) is arranged and / or formed and / or provided on and / or in a first chamber wall (4A), and wherein at least one second ventilation opening (8B), preferably a second opening, in particular for the preferably defined and / or predetermined outlet of air, preferably test atmosphere, from the reverberation chamber (3) is arranged and / or formed and / or provided on and / or in a second chamber wall (4B), in particular different from the first chamber wall (4A) and / or preferably opposite the first chamber wall (4A);in particular wherein the first ventilation opening (8A) and the second ventilation opening (8B) are arranged and / or designed and / or interact for the preferably defined and / or predetermined setting of environmental stress conditions in the hall chamber (3). Use according to one of claims 43 to 45, wherein the Hall chamber (3) is provided and / or arranged in a test device (1) according to one of the preceding claims. Uses according to any of the preceding claims, each characterized by one or more of the features of claims 1 to 39.

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