Portable automatic calibrating device and method

Abstract

The invention discloses a portable automatic calibration device and method, relates to the technical field of calibration of acoustic measurement equipment, and solves the problem that a sound level meter automatic calibration system in the prior art cannot perform outdoor field calibration on an environmental noise automatic monitor. The device comprises a box body, an upper computer, an audio signal generator, a multifunctional sound calibrator and at least two cameras, the upper computer, the audio signal generator, the multifunctional sound calibrator and the at least two cameras are arranged in the box body, the audio signal generator and the multifunctional sound calibrator are both connected with serial ports of the upper computer, and the box body is provided with a plurality of interfaces; the system further comprises a cloud platform which communicates with the upper computer and the camera, and the upper computer, the audio signal generator and the multifunctional sound calibrator are arranged in the box body, so that the system is convenient to carry, and an outdoor noise detection instrument can be calibrated; and the camera is arranged to shoot operation pictures of the upper computer and workers and upload the operation pictures to the cloud platform, so that the accuracy and reliability of a verification result are ensured.

Description

Technical Field

[0001] The present application relates to the technical field of calibration of acoustic measurement equipment, and in particular to a portable automatic calibration device and method. Background Art

[0003] The calibration of noise detection instruments in the prior art is mainly completed manually, and its main components are as follows:

[0004] 1. If Figure 2 The figure shows the wiring for electrical signal verification. The electrical signal verification process is as follows: the system controls the AWA1651 signal generator through the USB to serial port line to generate a signal for the device to be verified; the system reads the data measured by the instrument to be verified through the USB or serial port; the measured data is recorded and judged whether it is qualified according to the required tolerance.

[0005] 2. If Figure 3 The figure shows the wiring for low-frequency sound signal verification. The verification process is as follows: the system controls the low-frequency coupling cavity through AWA1651 to emit a 104dB sound signal (10Hz - 400Hz); the system reads the AWA5812 indication and the data measured by the verified equipment respectively; records and calculates the difference; and determines whether it is qualified according to the tolerance range.

[0006] 3. If Figure 4 The figure shows the wiring for high-frequency acoustic signal verification. The process of high-frequency acoustic signal verification is as follows: the system controls the test sound source through AWA1651 to emit an 84dB (500Hz-20kHz) acoustic signal; the system reads the AWA5812 indication and the data measured by the verified equipment respectively; records and calculates the difference; and determines whether it is qualified according to the tolerance range.

[0007] From the above, it can be seen that the automatic calibration system of sound level meters in the prior art has solved the defects of manual calibration to a certain extent. However, if you want to complete the whole set of calibration of the sound level meter, you need to rely on the anechoic chamber, and there are many devices involved, especially the calibration of sound signals. The automatic environmental noise monitor is often arranged outdoors, which is inconvenient to disassemble. The calibration regulations require calibration once a year, and the automatic calibration system of sound level meters in the prior art cannot meet the demand for on-site calibration of the automatic environmental noise monitor, resulting in a large workload for calibration. Summary of the invention

[0008] The purpose of the present application is to overcome the problem that the automatic calibration system of the sound level meter in the prior art cannot perform outdoor on-site calibration on the automatic environmental noise monitoring instrument, and to provide a portable automatic calibration device and method.

[0009] In a first aspect, a portable automatic calibration device is provided, comprising: a box body and a host computer, an audio signal generator, a multifunctional sound calibrator and at least two cameras arranged in the box body, the audio signal generator and the multifunctional sound calibrator are both connected to the serial port of the host computer, and the box body has a plurality of interfaces;

[0010] It also includes a cloud platform that communicates with the host computer and the camera.

[0011] In some possible implementations, the interface includes a USB interface and a BNC interface, wherein the USB interface is electrically connected to a host computer, and the BNC interface is electrically connected to an audio signal generator through a connector, wherein the USB interface is used to connect to the device under test, and the host computer obtains the measurement value of the device under test through the USB interface, and the BNC interface is the output interface of the audio signal generator, and is used to connect to a preamplifier connected to the device under test.

[0012] In some possible implementations, the interface also includes a LEMO interface, the multifunctional sound calibrator includes a host and a coupling cavity, the host is connected to the serial port of the host computer, and the host is connected to the coupling cavity through the LEMO interface, wherein the LEMO interface is the differential signal output interface of the host, the host generates a signal of a specified frequency, and outputs the differential signal to the moving iron unit in the coupling cavity through the LEMO interface, and the moving iron unit emits an acoustic signal.

[0013] In some possible implementations, the host computer has a touch screen and a first wireless communication module, the first wireless communication module is used to realize communication between the host computer and the cloud platform, and the camera has a second wireless communication module, wherein the camera can communicate directly with the cloud platform, and the camera can also communicate with the cloud platform through the host computer.

[0014] In some possible implementations, the box body has at least one of the following: a pull rod, a handle, a roller and a shoulder strap, the box body includes a first box and a second box that can be covered with the first box, the host computer is embedded in the inner wall of the first box, the interface, the audio signal generator and the multi-functional sound calibrator are all embedded in the inner wall of the second box, and the combination of the pull rod, the handle, the roller and the shoulder strap can facilitate the carrying of the box body.

[0015] In some possible implementations, the first box body is provided with a first storage slot that is compatible with the camera holder, and the second box body is provided with a second storage slot that is compatible with the camera. By providing the first storage slot and the second storage slot, the camera and the camera holder can be easily stored, so that the camera and the camera holder can also be stored in the box body.

[0016] In some possible implementations, the second box has a rechargeable power supply, a power switch, a charging interface and a power display module, wherein the host computer, the audio signal generator and the multi-functional sound calibrator are all electrically connected to the rechargeable power supply so that power can be drawn from the rechargeable power supply, the power switch is used to control the power supply of the rechargeable power supply, the charging interface is used to charge the rechargeable power supply, and the power display module is used to display the power of the rechargeable power supply, wherein the power supply control of the rechargeable power supply can be achieved through the power switch, the rechargeable power supply can be charged through the charging interface, and the remaining power of the rechargeable power supply can be easily known through the power display module.

[0017] In some possible implementations, the first box body is hinged to the second box body, and a lock and a limiter are provided between the first box body and the second box body, wherein the locker can lock the first box body and the second box body together after the first box body and the second box body are closed to prevent the first box body and the second box body from opening during carrying, and the limiter can limit the opening and closing angle when the first box body and the second box body are opened, and can also play a role in fixing the opening and closing angle.

[0018] In a second aspect, an electrical signal verification method is provided, comprising the device as described in any one of the implementations of the first aspect, the electrical signal verification method comprising:

[0019] S101. The cloud platform obtains the monitoring video of the host computer and the inspector through the camera, and the inspector connects the inspected device to the BNC interface;

[0020] S102, the host computer issues a start verification instruction and sends a first specified parameter to the audio signal generator, wherein the first specified parameter includes a signal type, a signal amplitude, a signal frequency, an amplitude attenuation, and a frequency adjustment;

[0021] S103, the host computer obtains the measurement value of the device under inspection;

[0022] S104, the host computer calculates the deviation between the standard value of the output signal of the audio signal generator and the measured value of the device under test, and the deviation calculation formula is as follows:

[0023]

[0024] In the formula, is the deviation between the measured value and the standard value at the current frequency, is the measured value of the device under test at the current frequency, It is the standard value output by the audio signal generator at the current frequency;

[0025] S105, judgment Whether the value of is within the first preset tolerance range;

[0026] S106, changing the output parameters of the audio signal generator, repeating steps S103 to S105 until a preset number of repetitions is reached, to obtain electrical signal verification data of multiple frequencies;

[0027] S107. After the calibration is completed, the host computer automatically saves the electrical signal calibration data, generates a calibration report, and uploads the calibration report to the cloud platform.

[0028] In a third aspect, a method for detecting an acoustic signal is provided, comprising the device as described in any one of the implementations of the first aspect, wherein the method for detecting an acoustic signal comprises:

[0029] S201. The cloud platform obtains the monitoring video of the host computer and the calibration personnel through the camera. After installing the preamplifier and microphone for the device under inspection, the calibration personnel inserts the microphone into the coupling cavity of the multifunctional sound calibrator.

[0030] S202, the host computer issues a start calibration instruction and sends second specified parameters to the multifunctional sound calibrator, where the second specified parameters include signal type, signal amplitude, signal frequency and signal attenuation.

[0031] S203, the host computer obtains the measurement value of the device under inspection;

[0032] S204, the host computer calculates the deviation between the standard value of the output signal of the multifunctional sound calibrator and the measured value of the device under test, and the calculation formula is as follows:

[0033]

[0034] In the formula, is the deviation between the measured value and the standard value at the current frequency, is the measured value of the device under test at the current frequency, It is the standard value output by the multi-function sound calibrator at the current frequency. is the correction value of the free-field microphone used for the equipment under test;

[0035] S205, Judgment Whether the value of is within the second preset tolerance range;

[0036] S206, changing the output parameters of the multifunctional sound calibrator, repeating steps S203 to S205 until a preset number of repetitions is reached, so as to obtain sound signal verification data of multiple frequencies;

[0037] S207. After the calibration is completed, the host computer automatically saves the acoustic signal calibration data, generates a calibration report, and uploads the calibration report to the cloud platform.

[0038] The present application has the following beneficial effects: the present application includes a host computer, an audio signal generator and a multifunctional sound calibrator arranged in a box body, which can be easy to carry and can realize the calibration of the outdoor environmental noise automatic detector. The host computer can be used to control the audio signal generator and the multifunctional sound calibrator, and read the measurement data of the environmental noise automatic detector, so that the host computer can realize the automation of the entire calibration process after the staff completes the wiring. Secondly, by setting a camera, the operation screen of the host computer and the staff can be photographed and uploaded to the cloud platform to ensure the accuracy and reliability of the calibration results. In addition, the host computer can also save the calibration results and make a calibration report and upload it to the cloud platform, and can support the printing of the calibration report. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 is a structural block diagram of a portable automatic verification device according to Example 1 of the present application;

[0042] Figure 2 It is the wiring diagram of the electric signal verification of the noise detection instrument in the prior art;

[0043] Figure 3 It is a low-frequency sound signal verification wiring diagram of a noise detection instrument in the prior art;

[0044] Figure 4 It is a high-frequency sound signal verification wiring diagram of a noise detection instrument in the prior art;

[0045] Figure 5 is a schematic diagram of electrical signal verification in the portable automatic verification device of Example 1 of the present application;

[0046] Figure 6 is a schematic diagram of acoustic signal verification in the portable automatic verification device of Example 1 of the present application;

[0047] Figure 7 It is a schematic diagram of the structure of the portable automatic calibration device in Example 1 of the present application with the box body opened;

[0048] Figure 8is a top view of the portable automatic calibration device of Example 1 of the present application with the box body opened;

[0049] Fig. 9 is a top view of the portable automatic calibration device of Example 1 of the present application with the cover above the rechargeable power supply and the coupling cavity removed;

[0050] Fig.10 is a flow chart of the electrical signal detection method of Example 2 of the present application;

[0051] Fig.11 It is a flow chart of the acoustic signal detection method of Example 3 of the present application.

[0052] Reference numerals:

[0053] 100, box body; 101, first box; 102, second box; 103, first storage slot; 104, second storage slot; 105, rechargeable power supply; 106, power switch; 107, charging interface; 108, power display module; 109, lock; 110, limiter; 200, host computer; 201, touch screen; 202, first wireless communication module; 300, audio signal generator; 400, multi-function sound calibrator; 401, host; 402, coupling cavity; 403, coupling cavity cover; 500, camera; 501, camera bracket; 501, second communication module; 600, cloud platform; 700, interface; 701, USB interface; 702, BNC interface; 703, adapter; 704, LEMO interface; 800, device under test; 901, preamplifier; 902, microphone. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Example 1

[0056] A portable automatic calibration device involved in Example 1 of the present application includes: a box body and a host computer, an audio signal generator, a multifunctional sound calibrator and at least two cameras arranged in the box body, the audio signal generator and the multifunctional sound calibrator are both connected to the serial port of the host computer, and the box body has multiple interfaces; it also includes a cloud platform that communicates with the host computer and the camera.

[0057] Specifically, Figure 1 and Figure 7The structure diagram of the portable automatic calibration device in Example 1 of the present application is shown, including a box body and a host computer, an audio signal generator, a multifunctional sound calibrator and at least two cameras arranged in the box body, the audio signal generator and the multifunctional sound calibrator are both connected to the serial port of the host computer, and the box body has a plurality of interfaces, wherein the interfaces include a USB interface, a BNC interface and a LEMO interface, wherein the USB interface is electrically connected to the host computer, and the BNC interface is electrically connected to the audio signal generator through a fitting device;

[0058] like Figure 1 As shown, the core components of the portable automatic calibration device are: a host computer, an audio signal generator, a multifunctional sound calibrator, a cloud platform and a camera. In this embodiment, an automatic environmental noise monitor is used as an example for explanation. The host computer is connected to the audio signal generator and the multifunctional sound calibrator through a serial port, and the host computer is used to control the output type and amplitude of the signal. The audio signal generator and the multifunctional sound calibrator are used for electrical signal calibration and sound signal calibration of the equipment to be tested, respectively.

[0059] In order to realize communication between the host computer and the camera and the cloud platform, the host computer has a touch screen and a first wireless communication module, the first wireless communication module is used to realize communication between the host computer and the cloud platform, and the camera has a second wireless communication module, wherein the host computer communicates with the cloud platform through the first wireless communication module, the first wireless communication module can be a 4G network module and a WIFI module, etc., and the camera can directly communicate with the cloud platform, for example: the second wireless communication module can also be a 4G network module and a WIFI module, etc., of course, the camera can also communicate with the host computer, and then use the first communication module as a transfer station to realize indirect communication with the cloud platform, for example: the first wireless communication module supports Bluetooth, 4G network and WIFI, and the second wireless communication module can be a Bluetooth module, 4G network or WIFI, etc.

[0060] like Figure 5 As shown, the verification of the electrical signal is mainly completed by the audio generator and the host computer. In this embodiment, the audio signal generator: the frequency range is 1Hz-80kHz, as a signal source, can be output through a BNC male connector;

[0061] Coordinator: It is an electrical signal conversion interface. One end of the coordinator is a BNC male connector, which is connected to the output end of the audio signal generator through a BNC cable. The other end of the coordinator is connected to the preamplifier of the automatic environmental noise monitoring instrument through a thread.

[0062] The audio signal generator is connected to the host computer through the COM serial port. The host computer controls the audio signal generator to output signals to the environmental noise automatic monitoring instrument through the specified protocol. The environmental noise automatic monitoring instrument transmits the measured signal information to the host computer through the COM serial port. The host computer processes the data of both and determines whether the electrical signal test is qualified.

[0063] like Figure 6 As shown, the calibration of the acoustic signal is mainly completed by a multifunctional acoustic calibrator and a host computer, wherein the multifunctional acoustic calibrator includes a host and a coupling cavity, the coupling cavity is embedded in the second box, a detachable coupling cavity cover is arranged above the coupling cavity, after the coupling cavity cover is removed, the microphone of the automatic environmental noise monitoring instrument can be inserted into the coupling cavity, the host is connected to the host computer COM serial port, and the host and the coupling cavity are connected through a LEMO interface.

[0064] In this embodiment, the multifunctional sound calibrator has a frequency range of 20Hz-16kHz and supports the output of pure tone signals, burst tone and repeated burst tone signals in the range of 90dB-114dB. The host generates a signal of a specified frequency and amplitude, and outputs the signal to the 8 moving iron units in the coupling cavity through the LEMO interface, and the moving iron units emit sound signals;

[0065] The multifunctional sound calibrator is connected to the host computer through the COM serial port. The host computer controls the multifunctional sound calibrator to output the sound signal of the specified frequency and sound pressure level through the specified protocol, inserts the microphone of the automatic environmental noise monitoring instrument into the coupling cavity, and measures the sound pressure level, and then transmits the sound pressure level of the measured signal to the host computer through the COM serial port. The host computer processes the data of both and determines whether the sound signal verification is qualified.

[0066] like Figure 7-Figure 9 As shown, the box body includes a first box body and a second box body that can be covered with the first box body. For example, the first box body is axially connected to the second box body, and the first box body and the second box body can be rotated along the axis to realize the opening and closing of the box body. The upper computer is embedded in the inner wall of the first box body, and the interface, audio signal generator and multi-functional sound calibrator are all embedded in the inner wall of the second box body. In order to facilitate the carrying of the box body, the box body can be provided with one or more of a pull rod, a handle, rollers and a shoulder strap. In order to store the camera and the camera bracket, the first box body is provided with a first storage groove that is compatible with the camera bracket, and the second box body is provided with a second storage groove that is compatible with the camera.

[0067] like Fig. 9As shown, in order to provide power to the box body, the second box body is provided with a rechargeable power supply, a power switch, a charging interface and a power display module, wherein the host computer, the audio signal generator and the multifunctional sound calibrator are all electrically connected to the rechargeable power supply so that power can be taken from the rechargeable power supply, the power switch is used to control the power supply of the rechargeable power supply, the charging interface is used to charge the rechargeable power supply, and the power display module is used to display the power of the rechargeable power supply, wherein the power supply control of the rechargeable power supply can be achieved through the power switch, the rechargeable power supply can be charged through the charging interface, and the remaining power of the rechargeable power supply can be easily known through the power display module. In addition, the camera can also be charged or powered by taking power from the USB interface through a USB cable.

[0068] like Figure 7 As shown, the first box body is hinged with the second box body, and a lock and a limiter are provided between the first box body and the second box body, wherein the locker can be any structure such as a mechanical lock, a password lock, a fingerprint lock, a lock structure or a zipper that can lock the first box body and the second box body together to prevent the first box body and the second box body from opening automatically, and the locker can lock the first box body and the second box body together after the first box body and the second box body are covered, so as to prevent the first box body and the second box body from opening during carrying, wherein the limiter can be a connecting rod, a slider and a slide groove, one end of the connecting rod is hinged with the second box body, and the other end of the connecting rod is fixedly connected to the slider, the slider is slidably arranged in the slide groove, and the slider can slide along the slide groove, and the first box body and the second box body are locked. When the box is opened, the slider slides to one end of the slide slot and uses the connecting rod to limit the opening and closing angle of the first box and the second box, so that the first box and the second box can maintain this angle. Usually, at this angle, the first box is tilted at a certain angle to facilitate the inspection personnel to watch and operate the touch screen of the host computer. Of course, the connecting rod mentioned above can also be flexible, or a rope can be used instead of the connecting rod, or the rope can be directly used as a limiter, one end of the rope is connected to the first box, and the other end is connected to the second box. It should be noted that the number of limiters can be customized according to needs. The limiter can limit the opening and closing angle when the first box and the second box are opened, and can also play a role in fixing the opening and closing angle.

[0069] In this embodiment, by arranging the host computer, audio signal generator and multi-function sound calibrator in a box, it is easy to carry and realize the calibration of outdoor noise detection instruments. The host computer can be used to control the audio signal generator and the multi-function sound calibrator, and read the measurement data of the noise detection instrument, so that the host computer can automate the entire calibration process after the staff completes the wiring. Secondly, by setting up a camera, the operation screen of the host computer and the staff can be photographed and uploaded to the cloud platform to ensure the accuracy and reliability of the calibration results. In addition, the host computer can also save the calibration results and make a calibration report and upload it to the cloud platform, and can support the printing of the calibration report.

[0070] Example 2

[0071] like Fig.10 As shown, an electrical signal verification method involved in Example 2 of the present application includes a device as described in any one of the implementation methods in Example 1, and the electrical signal verification method includes:

[0072] S101. The cloud platform obtains the monitoring video of the host computer and the inspector through the camera, and the inspector connects the inspected device to the BNC interface;

[0073] S102, the host computer issues a start verification instruction and sends a first specified parameter to the audio signal generator, wherein the first specified parameter includes a signal type, a signal amplitude, a signal frequency, an amplitude attenuation, and a frequency adjustment;

[0074] S103, the host computer obtains the measurement value of the device under test;

[0075] S104, the host computer calculates the deviation between the standard value of the output signal of the audio signal generator and the measured value of the device under test, and the deviation calculation formula is as follows:

[0076]

[0077] In the formula, is the deviation between the measured value and the standard value at the current frequency, is the measured value of the device under test at the current frequency, It is the standard value output by the audio signal generator at the current frequency;

[0078] S105, judgment Whether the value of is within the first preset tolerance range;

[0079] S106, the host computer changes the output parameters of the audio signal generator, and repeats steps S103 to S105 until a preset number of repetitions is reached to obtain electrical signal verification data of multiple frequencies;

[0080] S107. After the calibration is completed, the host computer automatically saves the electrical signal calibration data, generates a calibration report, and uploads the calibration report to the cloud platform.

[0081] It should be noted that the calibration personnel can also choose whether to print the calibration report according to needs, where the calibration report can include calibration reports of electrical signals and acoustic signals, or can only include calibration reports of electrical signals or acoustic signals. If the calibration report is printed at the inspection site, it is necessary to set a printing device in the box body or connect the printing device through a USB interface or other interface to print a paper report. The electronic version of the report can also be exported through a USB interface or wireless transmission technology. For other specific implementation methods of the portable automatic calibration method in this embodiment, please refer to the specific implementation methods of the above-mentioned portable automatic calibration device. To avoid redundancy, they will not be repeated here.

[0082] Example 3

[0083] like Fig.11 As shown, a sound signal detection method involved in Example 2 of the present application includes a device as described in any one of the implementation methods in Example 1, and the sound signal detection method includes:

[0084] S201. The cloud platform obtains the monitoring video of the host computer and the calibration personnel through the camera. After installing the preamplifier and microphone for the device under inspection, the calibration personnel inserts the microphone into the coupling cavity of the multifunctional sound calibrator.

[0085] S202, the host computer issues a start calibration instruction and sends second specified parameters to the multifunctional sound calibrator, where the second specified parameters include signal type, signal amplitude, signal frequency and signal attenuation.

[0086] S203, the host computer obtains the measurement value of the device under inspection;

[0087] S204, the host computer calculates the deviation between the standard value of the output signal of the multifunctional sound calibrator and the measured value of the device under test, and the calculation formula is as follows:

[0088]

[0089] In the formula, is the deviation between the measured value and the standard value at the current frequency, is the measured value of the device under test at the current frequency, It is the standard value output by the multi-function sound calibrator at the current frequency. is the correction value of the free-field microphone used for the equipment under test;

[0090] S205, Judgment Whether the value of is within the second preset tolerance range;

[0091] S206, changing the output parameters of the multifunctional sound calibrator, repeating steps S203 to S205 until a preset number of repetitions is reached, so as to obtain sound signal verification data of multiple frequencies;

[0092] S207. After the calibration is completed, the host computer automatically saves the acoustic signal calibration data, generates a calibration report, and uploads the calibration report to the cloud platform.

[0093] It should be noted that the calibration personnel can also choose whether to print the calibration report according to needs. For other specific implementations of the portable automatic calibration method in this embodiment, please refer to the specific implementations of the portable automatic calibration device mentioned above. To avoid redundancy, they will not be repeated here.

[0094] The above are only preferred specific implementations of the present application; however, the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved ideas of the present application within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A portable automatic calibration device, characterized in that: It includes a box body and a host computer, an audio signal generator, a multifunctional sound calibrator and at least two cameras arranged in the box body, the audio signal generator and the multifunctional sound calibrator are both connected to the serial port of the host computer, and the box body has multiple interfaces; It also includes a cloud platform that communicates with the host computer and the camera.

2. The portable automatic calibration device according to claim 1, characterized in that: The interface includes a USB interface and a BNC interface, wherein the USB interface is electrically connected to a host computer, and the BNC interface is electrically connected to an audio signal generator through a fitting device.

3. The portable automatic calibration device according to claim 2, characterized in that: The interface also includes a LEMO interface. The multifunctional sound calibrator includes a host and a coupling cavity. The host is connected to the serial port of the host computer, and the host is connected to the coupling cavity through the LEMO interface.

4. The portable automatic calibration device according to claim 1, characterized in that: The host computer has a touch screen and a first wireless communication module, the first wireless communication module is used to realize communication between the host computer and the cloud platform, and the camera has a second wireless communication module.

5. The portable automatic calibration device according to any one of claims 1 to 4, characterized in that: The box body includes a first box and a second box that can cover the first box. The host computer is embedded in the inner wall of the first box, and the interface, audio signal generator and multifunctional sound calibrator are all embedded in the inner wall of the second box.

6. The portable automatic calibration device according to claim 5, characterized in that: The first box body is provided with a first storage slot adapted to the camera bracket, and the second box body is provided with a second storage slot adapted to the camera.

7. The portable automatic calibration device according to claim 5, characterized in that: The second box has a rechargeable power supply, a power switch, a charging interface and a power display module, the power switch is used to control the power supply of the rechargeable power supply, the charging interface is used to charge the rechargeable power supply, and the power display module is used to display the power of the rechargeable power supply.

8. The portable automatic calibration device according to claim 5, characterized in that: The first box body is hinged to the second box body, and a locking member and a limiting member are arranged between the first box body and the second box body.

9. An electrical signal detection method, characterized in that: The device according to any one of claims 2 to 8, wherein the electrical signal detection method comprises: S101. The cloud platform obtains the monitoring video of the host computer and the inspector through the camera, and the inspector connects the inspected device to the BNC interface; S102, the host computer issues a start verification instruction and sends a first specified parameter to the audio signal generator, wherein the first specified parameter includes a signal type, a signal amplitude, a signal frequency, an amplitude attenuation, and a frequency adjustment; S103, the host computer obtains the measurement value of the device under test; S104, the host computer calculates the deviation between the standard value of the output signal of the audio signal generator and the measured value of the device under test, and the deviation calculation formula is as follows: ； In the formula, is the deviation between the measured value and the standard value at the current frequency, is the measured value of the device under test at the current frequency, It is the standard value output by the audio signal generator at the current frequency; S105, judgment Whether the value of is within the first preset tolerance range; S106, changing the output parameters of the audio signal generator, repeating steps S103 to S105 until a preset number of repetitions is reached, to obtain electrical signal verification data of multiple frequencies; S107. After the calibration is completed, the host computer automatically saves the electrical signal calibration data, generates a calibration report, and uploads the calibration report to the cloud platform.

10. A method for detecting an acoustic signal, characterized in that: The device according to any one of claims 3 to 8, wherein the acoustic signal detection method comprises: S201. The cloud platform obtains the monitoring video of the host computer and the calibration personnel through the camera. After installing the preamplifier and microphone for the device under inspection, the calibration personnel inserts the microphone into the coupling cavity of the multifunctional sound calibrator. S202, the host computer issues a start calibration instruction and sends second specified parameters to the multifunctional sound calibrator, wherein the second specified parameters include signal type, signal amplitude, signal frequency and signal attenuation; S203, the host computer obtains the measurement value of the device under inspection; S204, the host computer calculates the deviation between the standard value of the output signal of the multifunctional sound calibrator and the measured value of the device under test, and the calculation formula is as follows: ； In the formula, is the deviation between the measured value and the standard value at the current frequency, is the measured value of the device under test at the current frequency, It is the standard value output by the multi-function sound calibrator at the current frequency. is the correction value of the free-field microphone used for the equipment under test; S205, Judgment Whether the value of is within the second preset tolerance range; S206, changing the output parameters of the multifunctional sound calibrator, repeating steps S203 to S205 until a preset number of repetitions is reached, so as to obtain sound signal verification data of multiple frequencies; S207. After the calibration is completed, the host computer automatically saves the acoustic signal calibration data, generates a calibration report, and uploads the calibration report to the cloud platform.

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