Power amplifier test system

Abstract

The utility model relates to the technical field of electronic equipment testing, and particularly discloses a power amplifier testing system which comprises a console, at least one RCA interface arranged on the console and used for being connected with an audio signal source, at least one PUSH interface used for being connected with external control or communication equipment, an AC output interface used for being connected with a power supply and a control module. The RCA interface, the PUSH interface, the AC output interface and external equipment form a test circuit used for power amplifier test, and the control module is electrically connected with the test circuit and used for controlling various parameters and performance in the power amplifier test; the system can effectively solve the problems of single function, inaccurate test, inconvenient use and maintenance and the like in the existing power amplifier test, is connected with various external devices through the interfaces to adapt to different test scenes, accurately regulates and controls the test process by utilizing the control module, can be widely applied to the links of research and development, production, quality detection and the like of the power amplifier, and has a wide application prospect. And the comprehensiveness, the accuracy and the convenience of the power amplifier test are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic equipment test technical field especially discloses a power amplifier test system. BACKGROUND

[0002] In the development, production quality control and performance evaluation process of power amplifier, it is very important to test the power amplifier comprehensively and accurately. However, the traditional power amplifier test equipment and method has many shortcomings. On the one hand, with the continuous development of audio technology, various audio signal sources emerge in the market, and their audio quality and format difference is huge. The traditional test system often only has a single audio interface, which cannot be compatible with multiple signal sources, limiting the comprehensive evaluation of the power amplifier processing different audio capabilities. On the other hand, in terms of control and communication, the early test equipment can only be operated locally, lacks an interface for effective connection with external devices, and cannot realize remote complex control and automatic test, resulting in low test efficiency and difficulty in meeting the rapid detection needs in large-scale production. At the same time, the power supply environment in different regions is complex and diverse, and the fixed power supply adaptation mode of the traditional test system cannot simulate different voltage and frequency power supply conditions, which may lead to the disconnection between test results and actual application, and cannot guarantee the reliable operation of power amplifier products in the global range. SUMMARY

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide a power amplifier test system.

[0004] In order to achieve the above purpose, the utility model provides a power amplifier test system, which comprises a control console, at least one RCA interface arranged on the control console for connecting an audio signal source, at least one PUSH interface for connecting external control or communication equipment, an AC output interface for connecting a power supply, and a control module. The RCA interface, the PUSH interface and the AC output interface form a test circuit for power amplifier test between the external equipment, and the control module is electrically connected with the test circuit for controlling various parameters and performance in the power amplifier test.

[0005] Further, the number of RCA interfaces, the number of PUSH interfaces and the number of AC output interfaces are all set to multiple; the multiple RCA interfaces are used to connect different test signal sources to receive single-channel or multi-channel test signals; the multiple PUSH interfaces are used to connect different control and / or communication equipment to adapt to the test needs of different test scenes; and the output parameters of the multiple AC output interfaces are different to adapt to the test needs under different power supply parameters.

[0006] Further, the control console is further provided with a display screen electrically connected with the test circuit, and the display screen is used to display the parameter data and parameter change trend in the power amplifier test process.

[0007] Further, the control module has a switch assembly for controlling the on-off, switching and working mode of the test circuit, a resistance adjusting knob for adjusting the resistance value in the test circuit, and a display for displaying the working parameters of the test circuit in the working of the switch assembly and the resistance adjusting knob; the switch assembly, the resistance adjusting knob and the display work together to realize the control of the test circuit in the power amplifier test process.

[0008] Further, the switch assembly includes a signal switch, a power switch and a load switch electrically connected with the test circuit, the signal switch is connected in series on the test circuit after the RCA interface to control the on-off of the audio signal; the power switch is connected in series on the test circuit after the AC output interface to control the on-off of the power supply; the load switch is connected in series on the test circuit after the AC output interface and is arranged between the power amplifier output end of the test circuit and the load to control the on-off of the load and the test circuit, the load is used to convert the audio signal through the power amplifier into an acoustic signal; the signal switch, the power switch and the load switch work together to switch the working mode of the test circuit.

[0009] Further, the switch assembly further has a high-low voltage switch connected in series on the test circuit after the AC output interface, the high-low voltage switch is located after the power switch to switch the power supply voltage of the test circuit to meet the test requirements of the power amplifier under different rated power supply voltages.

[0010] Further, the switch assembly further has a bridging switch connected between the power amplifier output end and the load and connected in parallel with the load switch, the switch assembly switches the output connection mode of the power amplifier through the closing of the bridging switch.

[0011] Further, the switch assembly further has a circuit breaker connected in series in the test circuit, the switch assembly realizes the cutting off of a specific line in the test circuit through the opening of the circuit breaker to realize the isolation or troubleshooting of the specific line.

[0012] Further, the control console is provided with a power amplifier for amplifying the input audio signal, the power amplifier is electrically connected with the test circuit and its signal acquisition end is located on the test circuit after the RCA interface, the power amplifier has a power adjusting knob for adjusting the power amplification factor to realize the accurate control of the audio signal intensity in the power amplifier test process.

[0013] Further, the control console is provided with a spectrum analyzer for performing spectrum analysis on the audio signal in the power amplifier test process, the spectrum analyzer is electrically connected with the test circuit and its signal acquisition end is located on the test circuit after the RCA interface, the spectrum analyzer has a spectrum screen for directly displaying the spectrum characteristics of the audio signal and a parameter interface, the parameter interface is electrically connected with the control module or an external device to control the setting and adjustment of the analysis parameters of the spectrum analyzer.

[0014] The utility model discloses the beneficial effect of:

[0015] (1) the function of testing is rich and comprehensive: through a plurality of RCA interfaces can connect the signal source of different audio characteristics, and the processing capacity of power amplifier to various audio signals is comprehensively tested, a plurality of PUSH interfaces can connect different control and communication equipment, and the demand of various test scenes from simple to complex is satisfied, a plurality of AC output interfaces can adapt to different power parameters, simulate various power supply conditions to test the corresponding performance of power amplifier, and a variety of switches can switch different test modes, output connection mode and the like, and the power amplifier is carried out multidimensional performance detection.

[0016] (2) the test process is accurate and efficient: the resistance adjusting knob of control module can fine control test circuit resistance resistance value, simulates different circuit load, cooperates with the display that can show working parameter and the switch assembly that controls circuit on-off, switching and working mode, forms closed loop control system, so that test personnel can accurately set audio signal parameter, accurately measures the gain, distortion rate and other performance indexes of power amplifier, and guarantees the accuracy and comprehensiveness of test.

[0017] (3) the fault is convenient to troubleshoot and optimize performance: the circuit breaker switch can cut off specific line, and the line is isolated for targeted test and rapid troubleshooting, and the bridge switch can switch power amplifier output connection mode, and the performance difference under different output modes is compared and analyzed, and the optimization of power amplifier product is provided with clear direction. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 It is the overall structure schematic drawing of the utility model kind of power amplifier test system;

[0019] Fig. 2 It is the local structure schematic drawing of the utility model;

[0020] Fig. 3 It is the structure schematic drawing of control module of the utility model.

[0021] The reference signs include: 1, control console;11, fan;12, access door;2, RCA interface;3, PUSH interface;4, AC output interface;5, control module;51, switch assembly;511, signal switch;512, power switch;513, load switch;514, high-low voltage switch;515, bridge switch;516, circuit breaker switch;52, resistance adjusting knob;53, display;6, display screen;7, power amplifier;71, power adjusting knob;8, spectrum analyzer;81, spectrum screen;82, parameter interface. DETAILED DESCRIPTION

[0022] For the convenience of those skilled in the art to understand, the utility model is further explained below in combination with the embodiments and drawings, and the content mentioned in the implementation manner is not a limitation on the utility model.

[0023] Please refer to Figs. 1 to 3 As shown in the utility model, a power amplifier test system, including control cabinet 1, at least one RCA interface 2 for connecting audio signal source is arranged on control cabinet 1, at least one PUSH interface 3 for connecting external control or communication equipment, AC output interface 4 for connecting power supply and control module 5, RCA interface 2, PUSH interface 3 and AC output interface 4 and external equipment between constitute the test circuit for power amplifier test, control module 5 and test circuit electric connection are used for controlling each parameter and performance in power amplifier test.

[0024] Specifically, the number of RCA interface 2, the number of PUSH interface 3 and the number of AC output interface 4 are all set to multiple;Multiple RCA interface 2 is used to connect different test signal source to receive single-channel or multi-channel test signal;Multiple PUSH interface 3 is used to connect different control and / or communication equipment to adapt to the test requirement of different test scene;The output parameter of multiple AC output interface 4 is different to adapt to the test requirement under different power parameters.

[0025] Specifically, the control cabinet 1 is also provided with a display screen 6 electrically connected with the test circuit, and the display screen 6 is used to display the parameter data and parameter change trend in the power amplifier test process.

[0026] Specifically, the control module 5 has a switch assembly 51 for controlling the on-off, switching and working mode of the test circuit, a resistance adjusting knob 52 for adjusting the resistance value in the test circuit and a display 53 for displaying the working parameters of the test circuit in the working of the switch assembly 51 and the resistance adjusting knob 52;The switch assembly 51, the resistance adjusting knob 52 and the display 53 work cooperatively to realize the control of the test circuit in the power amplifier test process.

[0027] Specifically, the switch assembly 51 includes a signal switch 511, a power switch 512 and a load switch 513 electrically connected with the test circuit, the signal switch 511 is connected in series on the test circuit after RCA interface 2 to control the on-off of audio signal;The power switch 512 is connected in series on the test circuit after AC output interface 4 to control the on-off of power supply;The load switch 513 is connected in series on the test circuit after AC output interface 4 and is arranged between the power amplifier output end of the test circuit and the load to control the on-off of the load and the test circuit, and the load is used to convert the audio signal through the power amplifier into acoustic signal;The signal switch 511, the power switch 512 and the load switch 513 work cooperatively to switch the working mode of the test circuit.

[0028] Specifically, the switch assembly 51 further has a high-low voltage switch 514 connected in series on the test circuit after the AC output interface 4, which is located after the power switch 512 to switch the power voltage of the test circuit to meet the test requirements of the power amplifier under different rated power voltages.

[0029] Specifically, the switch assembly 51 further has a bridge switch 515 connected between the power amplifier output end and the load and connected in parallel with the load switch 513, and the switch assembly 51 switches the output connection mode of the power amplifier through the closing of the bridge switch 515.

[0030] Specifically, the switch assembly 51 further has a circuit breaker 516 connected in series in the test circuit, and the switch assembly 51 realizes the cutting off of a specific line in the test circuit through the opening of the circuit breaker 516 to realize the isolation or troubleshooting of the specific line.

[0031] Please refer to the drawings, a power amplifier test system of the utility model, including control console 1, at least one RCA interface 2 for connecting audio signal source set in control console 1, at least one PUSH interface 3 for connecting external control or communication equipment, AC output interface 4 for connecting power supply and control module 5, the RCA interface 2, PUSH interface 3 and AC output interface 4 and external equipment between constitute the test circuit for power amplifier test, control module 5 and test circuit electric connection are used for controlling each parameter and performance in power amplifier test.

[0032] In actual use, at least one RCA interface 2 is provided for connecting an audio signal source. RCA interface 2 is a common audio interface widely used in various audio devices such as CD players, MP players, etc. The existence of this interface enables the power amplifier test system to be compatible with a variety of different types of audio signal sources, making it convenient for test personnel to select appropriate audio input devices according to test requirements, so that the processing capacity of the power amplifier for different audio quality, format, etc. Audio signals can be tested. At the same time, at least one PUSH interface 3 is used to connect external control or communication equipment. This interface allows the system to communicate with external devices, such as connecting a computer or other control device. Through this connection, test personnel can perform more complex control operations on the power amplifier test system on the external device, such as remotely setting test parameters, recording test data, etc., greatly improving the flexibility and convenience of testing. The AC output interface 4 is used to connect the power supply, which ensures that the system can stably obtain power supply. Moreover, different power amplifier devices may have different power requirements, and this interface can be easily connected to appropriate power supply devices, such as AC power supplies of different voltages and frequencies, providing the possibility of testing power amplifiers with different power requirements.

[0033] The control module 5 is electrically connected with the test circuit, and is used for controlling various parameters and performances in the power amplifier test. This enables the test process to achieve high precision. For example, the tester can accurately set the strength, frequency and other parameters of the audio signal through the control module 5, simulate the audio input conditions in various actual use scenarios, and test the amplification effect and fidelity of the power amplifier to different audio parameters. For the performance test of the power amplifier, such as the gain, distortion rate, signal-to-noise ratio and other key performance indicators, the control module 5 can accurately measure and record according to the preset standards and procedures. This helps to comprehensively and objectively evaluate the performance of the power amplifier device, and can easily compare the performance differences of different power amplifier devices, providing reliable data support for the research and development, production quality control and other links of the power amplifier. The RCA interface 2, the PUSH interface 3 and the AC output interface 4 form a test circuit for power amplifier test with external devices. This integrated test circuit design enables the various interfaces and external devices to work cooperatively during the test process. The tester only needs to connect the corresponding external devices to the corresponding interfaces, and a complete test environment can be quickly set up, without the need for complex wiring and additional circuit building work, thereby improving the test efficiency.

[0034] Specifically, the number of RCA interfaces 2, the number of PUSH interfaces 3 and the number of AC output interfaces 4 are all set to multiple; the multiple RCA interfaces 2 are used to connect different test signal sources to receive single-channel or multi-channel test signals; the multiple PUSH interfaces 3 are used to connect different control and / or communication devices to adapt to the test requirements of different test scenarios; and the multiple AC output interfaces 4 have different output parameters to adapt to the test requirements under different power supplies.

[0035] In actual use, different test signal sources often have different audio characteristics, for example, some signal sources have a wide range of audio frequencies, and some focus on low or high frequency parts. By connecting these different signal sources through multiple RCA interfaces 2, the range of audio signal types involved in testing is greatly expanded. This enables the power amplifier test system to simulate a wider variety of audio input situations in actual use, ensuring more comprehensive testing of power amplifiers and identifying potential performance defects in various possible audio input scenarios. Multiple PUSH interfaces 3 are provided for connecting different control and / or communication devices, which means that appropriate external devices can be connected according to different test scenarios. For example, in an automated test scenario, professional automated test control equipment can be connected to automatically adjust test parameters, automatically record test data, and automatically generate test reports according to a pre-set program, improving test efficiency and accuracy. In a test scenario that requires manual fine-tuning, control equipment with a visual operation interface can be connected to facilitate real-time manual adjustment of parameters and observation of test dynamics by the test personnel. Different control and communication devices can also intervene and monitor the test process from different angles, allowing the test system to adapt to a variety of different test requirements from simple to complex. Since the output parameters of the multiple AC output interfaces 4 are different, they can adapt to test requirements under different power supplies. In practical applications, power amplifier equipment may be used in different regions and different power supply environments, with differences in power supply voltage, frequency, and other parameters. With multiple AC output interfaces 4 with different output parameters, these different power supply conditions can be simulated to accurately test the stability, safety, and tolerance to power fluctuations of power amplifier equipment in the corresponding power supply environment. For example, it can be tested whether the power amplifier can work normally under different standard voltages and different frequency power supplies, and whether the performance indicators still meet the requirements, thereby ensuring that the power amplifier product can operate reliably in different power supply environments around the world.

[0036] Specifically, the console 1 is also provided with a display screen 6 electrically connected to the test circuit, which is used to display parameter data and parameter change trends during power amplifier testing.

[0037] In actual use, in the power amplifier test process, there are various parameter data, which are numerous and complex, such as the intensity and frequency of the audio signal, the gain, distortion rate and signal-to-noise ratio of the power amplifier. These parameter data are directly displayed on the display screen 6, so that the tester can see the specific values of various parameters in real time without the help of other additional complex detection equipment or tedious data query operation. This enables the tester to master the current working state of the power amplifier at the first time, discover whether the parameters exceed the normal range or appear abnormal fluctuations in time, and help to quickly locate possible problems and improve the timeliness of the test. The display screen 6 can present the parameter change trend, which is of great significance for in-depth analysis of the performance characteristics of the power amplifier. For example, as the intensity of the audio signal gradually increases, how does the gain of the power amplifier change? By observing the change trend curve, the tester can understand the linear amplification capability of the power amplifier and judge its stability under different input intensities. For another example, by observing the trend of the distortion rate changing with the frequency, whether the power amplifier has prominent distortion problems in different frequency bands can be analyzed, and the frequency response characteristics of the power amplifier are evaluated, which helps to fully understand the performance of the power amplifier and provides strong data support for subsequent product optimization and debugging.

[0038] Specifically, the control module 5 has a switch assembly 51 for controlling the on-off, switching and working mode of the test circuit, a resistance adjusting knob 52 for adjusting the resistance value in the test circuit, and a display 53 for displaying the working parameters of the test circuit in the working of the switch assembly 51 and the resistance adjusting knob 52; the switch assembly 51, the resistance adjusting knob 52 and the display 53 work cooperatively to realize the control of the test circuit in the power amplifier test process.

[0039] In actual use, the switch assembly 51 can control the on-off, switching and working mode of the test circuit, which provides great flexibility for the test process. By controlling the on-off of the circuit, the tester can conveniently operate when starting or pausing the test, such as starting the test after connecting all the devices, quickly cutting off the circuit when encountering unexpected situations or needing to replace the test sample, etc., to ensure the safety of the test operation and the normal use of the equipment. The switching function allows quick conversion between different test circuit connection modes or different functional sub-circuits according to different test requirements, such as switching from a single-channel test circuit to a multi-channel test circuit to adapt to diversified power amplifier test scenarios. The working mode switching allows selection of different test modes, such as a regular performance test mode, an overload test mode, etc., to comprehensively examine the performance of the power amplifier under various working conditions. For specific power amplifier test items and requirements, the switch assembly 51 can be used to accurately select the appropriate working mode and circuit state, avoiding unnecessary test procedures and time waste. For example, for a power amplifier that has passed the basic performance test, it only needs to be switched to a specific advanced performance test mode for further detection, without the need to rebuild the entire test environment or start the complete test process from the beginning, thereby enabling more efficient completion of power amplifier tests at different stages and with different focuses, speeding up the test progress and improving the overall test efficiency.

[0040] The resistance adjustment knob 52 is used to adjust the resistance value in the test circuit, which is an important means of fine control of the test circuit. In the power amplifier test, the resistance value in the circuit will affect many electrical parameters such as current size, voltage distribution, etc., and then affect the input and output characteristics of the power amplifier. By rotating the resistance adjustment knob 52, the tester can change the resistance value in a more accurate way according to the test requirements, simulate different circuit load conditions, and accurately test the adaptability of the power amplifier to different load conditions, such as detecting the stability and distortion of the power amplifier output power under different loads, so that the test results are closer to the various complex circuit environments that may be encountered in actual use. The display 53 is used to display the working parameters of the test circuit during the operation of the switch assembly 51 and the resistance adjustment knob 52, which enables the tester to see the corresponding working parameter changes of the test circuit in real time during the process of operating the switch assembly 51 to turn on and off the circuit, switching, and adjusting the resistance adjustment knob 52 to change the resistance value. For example, the real-time numerical changes of the circuit voltage and current caused by switching or changing the resistance value can be seen, and the influence of each operation on the overall state of the circuit can be clearly understood, just like having an intuitive "dashboard" to facilitate timely detection of whether the operation achieves the expected effect and whether it causes abnormal parameter changes, thereby ensuring the accuracy of the test operation and the stability of the test process. The switch assembly 51, the resistance adjustment knob 52, and the display 53 work together to achieve comprehensive and accurate control of the test circuit during the power amplifier test process. The switch assembly 51 controls the overall circuit working state and mode selection, the resistance adjustment knob 52 finely adjusts the key parameters of the circuit, and the display 53 real-time feedbacks the circuit working parameter situation after operation, forming an organic closed-loop control system. Based on the information of the display 53, the tester can continuously adjust the test circuit using the switch assembly 51 and the resistance adjustment knob 52 to keep it in the most suitable state for the current power amplifier test project, whether it is basic performance testing or complex special working condition testing. The test process can be carried out in an orderly manner under precise control, improving the accuracy and comprehensiveness of the test.

[0041] Specifically, the switch assembly 51 includes a signal switch 511, a power switch 512, and a load switch 513 electrically connected to the test circuit. The signal switch 511 is connected in series to the test circuit after the RCA interface 2 to control the on-off of the audio signal; the power switch 512 is connected in series to the test circuit after the AC output interface 4 to control the on-off of the power supply; the load switch 513 is connected in series to the test circuit after the AC output interface 4 and is arranged between the power amplifier output end of the test circuit and the load to control the on-off of the load and the test circuit, and the load is used to convert the audio signal passing through the power amplifier into an acoustic signal; the signal switch 511, the power switch 512, and the load switch 513 work together to switch the working mode of the test circuit.

[0042] In actual use, the signal switch 511 is connected in series with the test circuit after the RCA interface 2, and is used to control the on-off of the audio signal. During the power amplifier test process, this design can enable the tester to accurately determine when to allow the audio signal to enter the test circuit according to the test stage and requirements. For example, in the preparation stage, when it is necessary to connect and adjust other equipment, set test parameters, etc., the signal switch 511 can be closed first to avoid unnecessary audio signal interference. When the test is formally started, the signal switch 511 is opened again to accurately and correctly allow the audio signal to enter the test circuit and be transmitted to the power amplifier for processing, thereby ensuring the orderliness and accuracy of the test process. If it is found during the test process that the audio output by the power amplifier is abnormal, such as having noise, sound interruption, etc., the on-off of the audio signal can be controlled by operating the signal switch 511 to quickly determine whether the problem is in the audio signal source itself or in the signal transmission link. The power switch 512 is connected in series with the test circuit after the AC output interface 4 and is used to control the on-off of the power supply. This is an important link for ensuring the safe and stable operation of the entire test system. When connecting, disassembling or adjusting the test circuit, etc., the power switch 512 can be closed to cut off the power supply, thereby avoiding the risk of electric shock due to misoperation and damage to the test equipment. Moreover, after the test is completed, the power switch 512 is closed in time, which can prevent potential problems such as overheating of the equipment, aging of the circuit, etc. that may be caused by long-time power-on, thereby prolonging the service life of the equipment and ensuring the safety of the test environment. The load switch 513 is connected in series with the test circuit after the AC output interface 4 and is arranged between the power amplifier output end of the test circuit and the load, and is used to control the on-off of the load and the test circuit. The load is used to convert the audio signal processed by the power amplifier into an acoustic signal. Through the load switch 513, the tester can decide whether to allow the audio signal processed by the power amplifier to be transmitted to the load for acoustic signal conversion.

[0043] The signal switch 511, the power switch 512 and the load switch 513 work cooperatively to switch the working mode of the test circuit, which enables the test system to adapt to various complex test requirements. For example, when performing basic power amplifier performance tests, the power switch 512 can be opened first to ensure power supply, the signal switch 511 can be opened to input the audio signal, and the load switch 513 can be closed to detect only the electrical performance indicators. After completing this stage of testing, the three switches are operated cooperatively to switch to a test mode for examining the sound production effect of the power amplifier, i.e., the load switch 513 is opened to realize the conversion from electrical performance test to acoustic performance test. For another example, when simulating complex test scenarios of different power sources, different audio inputs and different load combinations, the working mode of the test circuit can be quickly and accurately adjusted through the cooperative operation of the three switches, thereby fully covering various working conditions that the power amplifier may face and improving the comprehensiveness and effectiveness of the test.

[0044] Specifically, the switch assembly 51 further has a high-low voltage switch 514 in series on the test circuit after the AC output interface 4, which is located after the power switch 512 to switch the power voltage of the test circuit to meet the test requirements of the power amplifier under different rated power voltages.

[0045] In actual use, the high-low voltage switch 514 is located after the power switch 512 and in series on the test circuit after the AC output interface 4, and is used to switch the power voltage of the test circuit. In actual application, power amplifier products have different rated power voltage requirements, some of which are suitable for low voltage environments, and some of which need to work under high voltage conditions. Through the high-low voltage switch 514, the test system can flexibly simulate different power voltage conditions, whether it is a low voltage environment of V or a high voltage environment of V or even higher, which can be switched as needed. In this way, it greatly broadens the range of testable power amplifiers, whether it is a power amplifier product for the domestic market or for different voltage standard regions abroad, and can perform performance tests under the corresponding voltage conditions in the test system, ensuring the comprehensiveness of the test. Without the high-low voltage switch 514, using a fixed voltage to test power amplifiers with different rated power voltages may result in a mismatch in voltage. Either the voltage is too high, causing the internal circuit components of the power amplifier to bear excessive pressure, resulting in overload, damage, and other situations, affecting the normal progress of the test, or the voltage is too low, causing the power amplifier to fail to start normally or fail to perform as expected, resulting in inaccurate test results. The high-low voltage switch 514 can accurately switch to a voltage gear that matches the rated power voltage of the power amplifier under test, providing the appropriate power supply conditions for the power amplifier, ensuring that the power amplifier operates in a normal voltage environment, and making the measurement results of various test indicators such as power, distortion rate, and efficiency more accurate and reliable, which helps to truly evaluate the performance of the power amplifier.

[0046] Specifically, the switch assembly 51 further has a bridge switch 515 connected between the power amplifier output end and the load and in parallel with the load switch 513, and the switch assembly 51 switches the output connection mode of the power amplifier through the closing of the bridge switch 515.

[0047] In actual use, the bridge switch 515 is connected between the power amplifier output end and the load and is connected in parallel with the load switch 513, and by closing the bridge switch 515, the output connection mode of the power amplifier can be switched. In the actual application and test scene of the power amplifier, different output connection modes have different characteristics and purposes. For example, there are many common modes such as single-channel output, stereo output, and bridge output. The presence of the bridge switch 515 enables the test system to conveniently switch between these different output connection modes, so that the performance of the power amplifier in various output modes can be detected respectively. This greatly expands the functionality of the test, allowing the test personnel to fully understand the performance of the power amplifier in different output connection conditions, such as the power boost and spatial positioning effect of the sound when the output is bridged, and provides a richer dimension for evaluating the overall performance of the power amplifier. With the help of the bridge switch 515 to switch the output connection mode of the power amplifier, the test personnel can easily compare and analyze various performance indicators of the same power amplifier in different output connection modes. For example, compare the power output, distortion rate, sound clarity, and level difference when the output is bridged and when the output is ordinary stereo. Through such comparison, the advantages and disadvantages of each output connection mode can be clearly understood, and then a clear direction for optimizing the power amplifier product can be provided. If it is found that the bridge output increases the power while increasing the distortion rate, then the R&D personnel can improve the power amplifier circuit to better control the distortion while improving the power, thereby improving the overall quality of the product.

[0048] Specifically, the switch assembly 51 also has a circuit breaker 516 connected in series in the test circuit, and the switch assembly 51 realizes the cutting off of a specific line in the test circuit by disconnecting the circuit breaker 516, so as to realize the isolation or troubleshooting of the specific line.

[0049] In actual use, the circuit breaker 516 is connected in series in the test circuit, and the opening of the circuit breaker 516 can realize the disconnection of a specific line in the test circuit, thereby achieving the isolation of the specific line. During the test of the power amplifier, the entire test circuit is often complex and contains multiple lines with different functions, such as lines for transmitting audio signals, lines for supplying power to the power amplifier, and related lines for connecting loads. When it is necessary to focus on the function or performance of a part of the line and do not want other lines to interfere with it, the circuit breaker 516 can be used to disconnect the specific line to test the part of the line separately. For example, if only the electrical performance indicators of the power amplifier itself under the influence of no external load are to be detected, the line connected to the load can be disconnected by the circuit breaker 516 to isolate the line connected to the power amplifier, so that the test is more targeted and the range and object of the test are accurately controlled. When a fault occurs in the entire test circuit during the test, such as abnormal signal transmission or abnormal operation of the power amplifier, the circuit breaker 516 becomes an effective troubleshooting tool. By disconnecting different specific lines in turn, and then observing whether the fault phenomenon disappears or changes, the line on which the problem occurs can be quickly determined. For example, if the noise problem is solved after disconnecting a certain audio signal transmission line, the focus of troubleshooting can be focused on this line and the devices, interfaces, etc. connected thereto, greatly reducing the scope of troubleshooting, avoiding blind full inspection of the entire circuit, improving the efficiency of troubleshooting, and enabling the problem to be located and repaired more timely and accurately.

[0050] Specifically, the console 1 is provided with a power amplifier 7 for amplifying the input audio signal. The power amplifier 7 is electrically connected to the test circuit and has a signal collection end on the test circuit after the RCA interface 2. The power amplifier 7 has a power adjustment knob 71 for adjusting the power amplification factor, so as to accurately control the strength of the audio signal during the test of the power amplifier.

[0051] In actual use, the power amplifier 7 can amplify the power of the input audio signal, so that the audio signal has enough energy to drive the subsequent devices such as loudspeakers, etc., thereby generating a large enough volume. Under the condition of a given distortion rate, the input audio signal is reconstructed as faithfully, effectively and with low distortion as possible, and the sound quality closer to the original sound is restored, and the details and dynamic range of the sound are enriched. The audio signal in the test circuit can be acquired in real time so as to monitor and analyze various parameters of the signal and understand the transmission and processing of the audio signal in the entire system. The power amplifier 7 can amplify the audio signal according to the requirements of the test circuit, cooperate with the test circuit, and jointly complete the processing and testing tasks of the audio signal, thereby ensuring the normal operation of the entire system. The RCA interface 2 is usually a key node in the transmission of the audio signal, and the signal collected after the RCA interface 2 can ensure that the audio signal after a certain processing and stable transmission is acquired, thereby reducing the influence of possible signal interference and unstable factors in the front end.

[0052] Specifically, the console 1 is provided with a spectrum analyzer 8 for performing spectrum analysis on the audio signal in the power amplifier test process. The spectrum analyzer 8 is electrically connected with the test circuit and its signal acquisition end is located on the test circuit after the RCA interface 2. The spectrum analyzer 8 has a spectrum screen 81 for directly displaying the spectrum characteristics of the audio signal and a parameter interface 82 electrically connected with the control module 5 or an external device for controlling the setting and adjustment of the analysis parameters of the spectrum analyzer 8.

[0053] In actual use, the settings of the spectrum analyzer 8 can conduct in-depth spectral analysis on the audio signal during the power amplifier test process. This helps to comprehensively understand the frequency composition, energy distribution and other characteristics of the audio signal, which is crucial for evaluating the performance of the power amplifier and the quality of the audio signal. Through electrical connection with the test circuit, the spectrum analyzer 8 can obtain the audio signal in real time, so that it can dynamically monitor the spectral changes of the audio signal during the operation of the power amplifier. For example, when the load of the power amplifier changes or the frequency of the input audio signal changes, the spectrum analyzer 8 can timely capture these changes, providing a basis for timely adjustment and optimization of the performance of the power amplifier. The signal acquisition end is located on the test circuit after the RCA interface 2, ensuring that the acquired audio signal has undergone preliminary transmission and processing. The RCA interface 2 is a common interface for audio signal transmission, and acquiring the signal after it can avoid the influence of unstable front-end signals or interference factors on spectral analysis. For example, the signal may be subject to electromagnetic interference during transmission from the signal source to the RCA interface 2, and acquiring it after the RCA interface 2 can reduce the influence of such interference on the spectral analysis results to some extent, thereby obtaining more accurate spectral characteristics. The spectrum screen 81 can intuitively display the spectral characteristics of the audio signal. This is very convenient for test personnel, who can directly see the frequency distribution, relative intensity of each frequency component and other information of the audio signal from the screen. For example, by observing the peaks on the spectrum screen 81, the main frequency components of the audio signal can be quickly determined, and the bandwidth of the signal can be understood by observing the width of the spectrum. The parameter interface 82 is electrically connected with the control module 5 or external devices, used to control the setting and adjustment of the analysis parameters of the spectrum analyzer 8. This allows test personnel to flexibly change the parameters of the spectrum analyzer 8 according to specific test requirements. For example, they can adjust the frequency resolution to observe the spectrum of the audio signal more finely, or adjust the scanning range to focus on the spectral characteristics of a specific frequency band.

[0054] In this embodiment, the control console 1 is also provided with a fan 11 for ventilation and heat dissipation of internal electrical equipment.

[0055] In actual use, inside the control console 1 of the power amplifier test system, there are many electrical equipment such as control module 5, various interface circuits, etc. These devices will generate heat during long-time operation. The presence of the fan 11 can timely remove these heat through continuous air flow, so that the internal electrical equipment is always within the appropriate working temperature range. For example, the electronic components in the control module 5 may experience performance degradation, shortened life or even damage in a high-temperature environment, while the fan 11 continuously dissipates heat for them, so that the control module 5 can stably and efficiently operate, accurately control various parameters and performance in the power amplifier test, avoid equipment failures caused by overheating affecting the test work, and ensure the normal operation of the entire test system.

[0056] In the embodiment, the console 1 is further provided with a maintenance door 12 rotatably and / or slidably arranged on the console 1 for maintenance of the electrical equipment inside the console 1.

[0057] In actual use, the maintenance door 12 is rotatably or slidably arranged on the console 1. When the electrical equipment inside the console 1 needs to be maintained, repaired or troubleshooted, the maintenance door 12 can be easily opened by rotation or sliding to quickly provide an operation channel directly to the internal equipment. Compared with the fixed and closed console 1 structure, the design avoids the cumbersome disassembly process, and the tester can quickly access the internal control module 5, interface circuit, power circuit and other electrical equipment, which facilitates the viewing, detection and corresponding maintenance operation of the electrical equipment, greatly saving the time and effort spent on the preparation work before maintenance. The two opening modes of rotation and sliding have their own advantages. The rotary maintenance door 12 can flexibly adjust the opening angle according to the needs, and in the case of limited space, the appropriate angle is selected for opening, which will not occupy too much surrounding space. The sliding maintenance door 12 is suitable for the scene where the space around the console 1 is relatively cramped and it is not convenient to have a large amplitude rotation door opening action. Through sliding, the maintenance door 12 can be smoothly opened or closed to provide convenience for the maintenance work. Whether the console 1 is used in a relatively spacious laboratory environment or a relatively narrow machine room, the flexible opening mode of the maintenance door 12 can well adapt to different space conditions and meet the maintenance operation requirements.

[0058] The above is only a preferred embodiment of the present application. For those skilled in the art, according to the idea of the present application, the specific implementation and application range can be changed, and the content of the specification should not be understood as a limitation of the present application.

Claims

1. A power amplifier test system, characterized by: The power amplifier test device comprises a console (1), at least one RCA interface (2) arranged on the console (1) and used for connecting an audio signal source, at least one PUSH interface (3) used for connecting an external control or communication device, an AC output interface (4) used for connecting a power supply, and a control module (5), wherein the RCA interface (2), the PUSH interface (3) and the AC output interface (4) form a test circuit for power amplifier test between the external device and the test circuit, and the control module (5) is electrically connected with the test circuit and used for controlling various parameters and performances in the power amplifier test.

2. The power amplifier test system of claim 1, wherein: The number of the RCA interfaces (2), the number of the PUSH interfaces (3) and the number of the AC output interfaces (4) are all set to be multiple; the multiple RCA interfaces (2) are used for connecting different test signal sources to receive single-channel or multi-channel test signals; the multiple PUSH interfaces (3) are used for connecting different control and / or communication devices to adapt to the test requirements of different test scenes. The output parameters of the multiple AC output interfaces (4) are different to adapt to the test requirements under different power supply parameters.

3. The power amplifier test system of claim 1, wherein: The console (1) is further provided with a display screen (6) electrically connected with the test circuit, and the display screen (6) is used for displaying parameter data and parameter change trend in the power amplifier test process.

4. The power amplifier test system of claim 1, wherein: The control module (5) has a switch assembly (51) used for controlling the on-off, switching and working mode of the test circuit, a resistance adjusting knob (52) used for adjusting the resistance value in the test circuit, and a display (53) used for displaying the working parameters of the test circuit in the working process of the switch assembly (51) and the resistance adjusting knob (52); the switch assembly (51), the resistance adjusting knob (52) and the display (53) work cooperatively to realize the control of the test circuit in the power amplifier test process.

5. The power amplifier test system of claim 4, wherein: The switch assembly (51) comprises a signal switch (511), a power supply switch (512) and a load switch (513) electrically connected with the test circuit, the signal switch (511) is connected in series on the test circuit after the RCA interface (2) to control the on-off of the audio signal, the power supply switch (512) is connected in series on the test circuit after the AC output interface (4) to control the on-off of the power supply, and the load switch (513) is connected in series on the test circuit after the AC output interface (4) and arranged between the power amplifier output end of the test circuit and a load to control the on-off of the load and the test circuit, and the load is used for converting the audio signal through the power amplifier into an acoustic signal; the signal switch (511), the power supply switch (512) and the load switch (513) work cooperatively to switch the working mode of the test circuit.

6. The power amplifier test system of claim 5, wherein: The switch assembly (51) further has a high-low voltage switch (514) connected in series on the test circuit after the AC output interface (4), and the high-low voltage switch (514) is arranged after the power supply switch (512) to switch the power supply voltage of the test circuit to meet the test requirements of the power amplifier under different rated power supply voltages.

7. The power amplifier test system of claim 5, wherein: The switch assembly (51) further has a bridge switch (515) connected between the output end of the power amplifier and the load in parallel with the load switch (513), and the switch assembly (51) switches the output connection mode of the power amplifier via the closing of the bridge switch (515).

8. The power amplifier test system of claim 4, wherein: The switch assembly (51) further has a circuit breaker (516) connected in series in the test circuit, and the switch assembly (51) realizes the cutting off of a specific line in the test circuit via the opening of the circuit breaker (516), so as to realize the isolation or troubleshooting of the specific line.

9. The power amplifier test system of claim 1, wherein: The control console (1) is provided with a power amplifier (7) for amplifying the input audio signal, the power amplifier (7) is electrically connected with the test circuit and its signal acquisition end is located on the test circuit after the RCA interface (2), the power amplifier (7) has a power adjustment knob (71) for adjusting the power amplification multiple, so as to realize the accurate control of the audio signal strength in the power amplifier test process.

10. The power amplifier test system of claim 1, wherein: The control console (1) is provided with a spectrum analyzer (8) for performing spectrum analysis on the audio signal in the power amplifier test process, the spectrum analyzer (8) is electrically connected with the test circuit and its signal acquisition end is located on the test circuit after the RCA interface (2), the spectrum analyzer (8) has a spectrum screen (81) for directly displaying the spectrum characteristics of the audio signal and a parameter interface (82) electrically connected with the control module (5) or external equipment for controlling the setting and adjustment of the analysis parameters of the spectrum analyzer (8).

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