Automatic detection tool for communication module

Abstract

The utility model provides a communication module automatic detection frock, including frock casing, frock plate, control module, GPRS test antenna, switch power supply and a plurality of test interface, the frock plate is installed inside frock casing, the frock plate is equipped with the control module, the switch power supply is arranged on one side of frock plate, the control module is connected to the plurality of test interface respectively through the line, and the test interface is connected with the control module through the line. The test interface is also connected with the GPRS test antenna, and the tool housing is provided with a plurality of interface holes used for avoiding the test interface. The beneficial effects of the utility model are that the tool can realize the integration of multiple functions: the tool integrates multiple functions of test power supply, communication interaction, debugging interface collection, power consumption measurement, antenna supply and the like. The device not only can provide a stable 12V working power supply for eight sets of GPRS modules, but also can simulate the 101 protocol communication capability of a forwarding station, and achieves the comprehensive function test of the modules.

Description

Technical Field

[0001] This utility model belongs to the field of communication module testing, and in particular relates to an automatic testing fixture for communication modules. Background Technology

[0002] In power systems, wireless communication modules are crucial for devices such as fault indicators. Fault indicators need to monitor the status of distribution lines in real time, accurately identify faults such as short circuits and grounding faults, and promptly upload fault information to devices such as FTUs (Feeder Terminal Units) to achieve effective monitoring and management of distribution lines. The performance of the wireless communication module directly affects the normal operation of the fault indicator and the overall reliability of the power system.

[0003] For example, in long-distance external fault indicators, they need to work with FTUs to transmit detected fault signals to the monitoring center so that maintenance personnel can take timely measures. If the wireless communication module malfunctions, fault information may not be transmitted in a timely manner, affecting the normal operation of the power system and potentially even causing safety accidents.

[0004] Specifically, the shortcomings of existing GPRS module testing fixtures are as follows:

[0005] Functional limitations:

[0006] Traditional GPRS module testing fixtures have many functional limitations. Some fixtures can only provide simple power supply and basic communication testing functions, and are weak in complex protocol parsing and interaction capabilities. For example, when testing a GPRS module for a fault indicator, it cannot accurately simulate the 101 protocol communication capabilities of a relay station, making it difficult to comprehensively evaluate the module's performance in actual working scenarios.

[0007] Some tooling lacks the capability to accurately measure key indicators such as module power consumption. In power equipment, power consumption is a crucial parameter directly impacting operating efficiency and battery life. Existing tooling may not be able to accurately measure the power consumption of GPRS modules under different operating conditions, failing to meet the testing requirements for low-power designs.

[0008] Testing efficiency issues:

[0009] Existing tooling has low testing efficiency, making it difficult to meet the needs of mass production. During the production process, each tooling board provides a limited number of test interfaces, making it impossible to efficiently test multiple GPRS modules simultaneously. For example, some tooling can only test 1-2 modules at a time, leading to extended production cycles and increased costs.

[0010] The tooling is not highly automated during the testing process, requiring frequent manual intervention, such as manually setting parameters and changing modules. This can easily lead to human error and reduce the consistency and accuracy of the test.

[0011] Poor compatibility and scalability:

[0012] Different GPRS module models may differ in interfaces and protocols, but existing tooling has poor compatibility and is difficult to adapt to the testing requirements of various module models. This means that when testing different modules, it may be necessary to change the tooling or make complex adjustments, increasing testing costs and time.

[0013] The tooling lacks scalability in its design, making it difficult to expand its functionality as technology advances and products are upgraded. For example, when a GPRS module adds new functions or features, the existing tooling may not be able to support the corresponding tests in a timely manner, requiring redesign or modification of the tooling.

[0014] Lack of unified debugging procedures and standards:

[0015] The lack of unified debugging procedures and standards during the debugging process of GPRS modules leads to inconsistencies in the operating methods and processes used by different debugging personnel. This may affect the accuracy and reliability of the debugging results, increasing the uncertainty of product quality.

[0016] For example, in the visual inspection of modules, there are no clear standards specifying which defects are acceptable and which are unacceptable, which can easily lead to some potential problems being overlooked. During software configuration and testing, different debugging personnel may use different parameter settings and judgment criteria, making it difficult to guarantee product consistency. Utility Model Content

[0017] In view of this, the present invention aims to provide an automatic detection fixture for communication modules to solve at least one of the problems existing in the prior art.

[0018] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0019] An automatic testing fixture for a communication module includes a fixture housing, a fixture plate, a control module, a GPRS test antenna, a switching power supply, and several test interfaces. The fixture plate is installed inside the fixture housing, and the control module is installed on the fixture plate. The switching power supply is located on one side of the fixture plate. The control module is connected to several test interfaces by circuitry. The test interfaces are also connected to the GPRS test antenna. Several interface holes are provided on the fixture housing to accommodate the test interfaces.

[0020] Furthermore, the control module includes a main control module, a communication module, an antenna interface module, a current sampling module, and a serial port server. The communication module, antenna interface module, current sampling module, and serial port server are all electrically connected to the main control module.

[0021] Furthermore, the main control module includes two main control chip circuits, one of which includes a main control chip U2A and resistors R11, R13, R15, R16, R18, R20, R35, R34, R44 and capacitor C21, all of which are connected to its pins.

[0022] Another main control chip circuit includes a main control chip U2B, a resistor R48, capacitors C31, C22, C23, C24, C25, C26, C27, C28, C29, C30, C32, an inductor L2, and a resistor R49. The VBAT pin of the main control chip U2B is connected to resistor R48 and capacitor C31 respectively. Resistor R48 and capacitor C31 are both connected to VCC 3.3. Capacitors C22, C23, C24, C25, C26, and C27 are connected in parallel and are all connected to VCC 3.3. Capacitors C28, C29, C30, and C32 are connected in parallel. Capacitors C28 and C29 are each connected to one end of resistor R49, and capacitors C29 and C32 are connected to the other end of resistor R49.

[0023] Furthermore, the circuit of the switching power supply includes power supply BAT1, diode D2, diode D4, resistor R5, capacitor C5, capacitor C6, electrolytic capacitor EC3, electrolytic capacitor EC4, electrolytic capacitor EC5, electrolytic capacitor EC6, capacitor C20, capacitor C17, capacitor C18, capacitor C19, capacitor C15, resistor R36, resistor R40, resistor R41, capacitor C13, chip U3, capacitor C16, resistor R37, resistor R38, capacitor E1, capacitor E2, capacitor C14, inductor L1, and diode D3. Power supply BAT1 is connected to diodes... Diodes D2 and D4 are connected to capacitors C5, C5, C5, C5, C6, EC3, EC4, EC5, and EC6 via resistor R5. Diode D4 is connected to capacitors C20, C17, C18, C19, C15, resistor R36, resistor R40, and chip U3. Chip U3 is also connected to resistor R41, capacitors C13 and C16, resistor R37, resistor R38, capacitors E1, E2, and C14, inductor L1, and diode D3.

[0024] Furthermore, the communication module includes three GPRS modules, which communicate with the main control module. The first GPRS module includes a chip N3 and capacitors C44, C45, resistor R12, C42, C43, C46, ​​EC9, and terminal P6, all of which are connected to its pins.

[0025] The second GPRS module includes chip N1 and capacitors C3, C4, R4, C1, C2, C7, EC8, XS1 and XS2, all of which are connected to its pins. Terminal XS1 is also connected to resistor R1 and terminal XS2 is also connected to resistor R3.

[0026] The third GPRS module includes chip N2 and capacitors C9, C11, R26, C8, C10, C12, EC7, XS3, and XS4, all of which are connected to its pins. Terminal XS3 is also connected to resistor R14, and terminal XS4 is also connected to resistor R21.

[0027] Furthermore, the current sampling module includes four sampling sub-units, wherein the first sampling sub-unit includes an amplifier U1A and resistors R6, R7, R10 and R9, which are all connected to its pins. Resistor R10 is also connected to capacitor C37, and resistor R9 is also connected to capacitor C33.

[0028] The second sampling subunit includes amplifier U1B and resistors R17, R19, R23 and R22, all of which are connected to its pins. Resistor R23 is also connected to capacitor C38, and resistor R22 is also connected to capacitor C34.

[0029] The third sampling subunit includes amplifier U1C and resistors R27, R28, R32 and R30, all connected to its pins. Resistor R32 is also connected to capacitor C39, and resistor R30 is also connected to capacitor C35.

[0030] The fourth sampling subunit includes amplifier U1D and resistors R39, R42, R46 and R45, all connected to its pins. Resistor R46 is also connected to capacitor C40, and resistor R45 is also connected to capacitor C36.

[0031] Compared with existing technologies, the automatic detection fixture for communication modules described in this utility model has the following advantages:

[0032] (1) The automatic testing fixture for communication modules described in this utility model can achieve multi-functional integration: the fixture integrates multiple functions such as test power supply, communication interaction, debugging interface aggregation, power consumption measurement, and antenna provision. For example, it can provide a stable 12V working power supply for 8 GPRS modules at the same time, and can also simulate the 101 protocol communication capability of the repeater station to realize comprehensive functional testing of the modules.

[0033] (2) The automatic testing fixture for communication modules described in this utility model can achieve high-precision power consumption measurement: it adopts a rail-to-rail input / output precision operational amplifier (such as AD8604A) and a specific current sampling resistor (0.05R precision resistor) and circuit design to accurately measure the power consumption of the module. At the same time, it has a coefficient adjustment function, which can correct the error of the sampling resistor and the operational amplifier amplification factor adjustment resistor to ensure the accuracy of power consumption measurement, which is crucial for evaluating the energy consumption performance of GPRS modules in power equipment.

[0034] (3) The automatic testing fixture for communication modules described in this utility model can achieve parallel testing capability for multiple devices: the fixture testing software can test 8 sets of devices simultaneously, display various key information (network access information, power consumption, signal strength, etc.) and determine whether the module is qualified, which greatly improves the testing efficiency and meets the testing needs of mass production. At the same time, the software supports configuration information import, multi-device settings and individual control, which enhances the flexibility of testing. Attached Figure Description

[0035] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0036] Figure 1 This is a schematic diagram of the detection tooling structure described in an embodiment of the present utility model;

[0037] Figure 2 This is a schematic diagram of the detection tooling principle described in an embodiment of the present utility model;

[0038] Figure 3 This is a circuit diagram of the main control module according to an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the main control module two circuit according to an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of the GPRS test antenna interface circuit according to an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the communication module circuit according to an embodiment of the present utility model;

[0042] Figure 7 This is a schematic diagram of the switching power supply circuit described in an embodiment of the present invention;

[0043] Figure 8 This is a schematic diagram of the current sampling module circuit according to an embodiment of the present invention;

[0044] Figure 9 This is a schematic diagram of the serial port server connection described in an embodiment of the present invention.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Tooling housing; 2. Test interface. Detailed Implementation

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0048] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0051] like Figures 1 to 9 As shown, an automatic testing fixture for a communication module includes a fixture housing 1, a fixture plate, a control module, a GPRS test antenna, a switching power supply, and several test interfaces 2. The fixture plate is installed inside the fixture housing 1, and the control module is installed on the fixture plate. The switching power supply is set on one side of the fixture plate. The control module is connected to several test interfaces 2 by lines. The test interfaces 2 are also connected to the GPRS test antenna. Several interface holes are opened on the fixture housing 1 to accommodate the test interfaces 2.

[0052] In this embodiment, test interface 2 includes terminals for connecting GPRS modules (for repeater stations with compatible specifications and wiring), power input terminals (for repeater stations with compatible specifications and wiring), a serial port for connecting to a computer (for communication), and debugging interfaces and power and communication interfaces (4 sets in total) for connecting individual modules.

[0053] In this embodiment, the GPRS test antenna is used for signal testing of the GPRS module. It is easy to replace and has a mounting bracket, preventing damage to other components due to antenna problems.

[0054] Advantages of this tooling:

[0055] Multifunctional integration: The fixture integrates multiple functions such as test power supply, communication interaction, debugging interface aggregation, power consumption measurement, and antenna provision. For example, it can provide a stable 12V operating power to 8 GPRS modules simultaneously, and can also simulate the 101 protocol communication capability of a repeater station, enabling comprehensive functional testing of the modules.

[0056] High-precision power consumption measurement: Employing rail-to-rail input / output precision operational amplifiers (such as the AD8604A) and specific current sampling resistors (0.05R precision resistors) and circuit design, the module's power consumption is accurately measured. Simultaneously, a coefficient adjustment function is provided to correct for errors in the sampling resistors and operational amplifier amplification factor adjustment resistors, ensuring the accuracy of power consumption measurement. This is crucial for evaluating the energy consumption performance of GPRS modules in power equipment.

[0057] Multi-device parallel testing capability: The tooling testing software can test up to 8 sets of devices simultaneously, displaying various key information (network access information, power consumption, signal strength, etc.) and determining whether the modules are qualified, greatly improving testing efficiency and meeting the needs of mass production testing. At the same time, the software supports configuration information import, multi-device settings, and individual control, enhancing testing flexibility.

[0058] In a preferred embodiment of this utility model, the control module includes a main control module, a communication module, an antenna interface module, a current sampling module, and a serial port server. The communication module, antenna interface module, current sampling module, and serial port server are all electrically connected to the main control module. The main control module includes two main control chip circuits. One of the main control chip circuits includes a main control chip U2A and resistors R11, R13, R15, R16, R18, R20, R35, R34, R44, and capacitor C21, all of which are connected to its pins.

[0059] Another main control chip circuit includes a main control chip U2B, a resistor R48, capacitors C31, C22, C23, C24, C25, C26, C27, C28, C29, C30, C32, an inductor L2, and a resistor R49. The VBAT pin of the main control chip U2B is connected to resistor R48 and capacitor C31 respectively. Resistor R48 and capacitor C31 are both connected to VCC 3.3. Capacitors C22, C23, C24, C25, C26, and C27 are connected in parallel and are all connected to VCC 3.3. Capacitors C28, C29, C30, and C32 are connected in parallel. Capacitors C28 and C29 are each connected to one end of resistor R49, and capacitors C29 and C32 are connected to the other end of resistor R49.

[0060] In this embodiment, the main control module includes a main control chip (STM32L476): as the control core of the tooling, it coordinates the implementation of various functions, and is responsible for controlling data acquisition, processing and transmission, as well as interaction with computer software.

[0061] In this embodiment, the control module on the tooling board includes a main control chip, a power chip, and a communication chip. Each tooling board can provide four power supplies and test interfaces simultaneously. Two boards connected in parallel can provide eight power supplies, meeting the simultaneous testing needs of eight sets of equipment.

[0062] In a preferred embodiment of this utility model, the circuit of the switching power supply includes power supply BAT1, diode D2, diode D4, resistor R5, capacitor C5, capacitor C6, electrolytic capacitor EC3, electrolytic capacitor EC4, electrolytic capacitor EC5, electrolytic capacitor EC6, capacitor C20, capacitor C17, capacitor C18, capacitor C19, capacitor C15, resistor R36, resistor R40, resistor R41, capacitor C13, chip U3, capacitor C16, resistor R37, resistor R38, capacitor E1, capacitor E2, capacitor C14, inductor L1, and diode D3. The power supply BAT1... Diodes D2 and D4 are connected to resistor R5, which in turn connects to capacitors C5, C5, C5, C5, C6, electrolytic capacitors EC3, EC4, EC5, and EC6. Diode D4 is connected to capacitors C20, C17, C18, C19, C15, resistors R36 and R40, and chip U3. Chip U3 is also connected to resistor R41, capacitors C13 and C16, resistors R37 and R38, capacitors E1 and E2, capacitor C14, inductor L1, and diode D3.

[0063] In this embodiment, the switching power supply converts AC220V mains power to DC12V / 5A DC power to power the tooling board and GPRS module. The current must reach at least 5A to ensure stable power supply. Ideally, the mains power supplied to the switching power supply should be shared with the computer and serial server via a single power strip.

[0064] In a preferred embodiment of this utility model, the communication module includes three GPRS modules, which communicate with the main control module. The first GPRS module includes a chip N3 and capacitors C44, C45, resistor R12, C42, C43, C46, ​​EC9, and terminal P6, all of which are connected to its pins.

[0065] The second GPRS module includes chip N1 and capacitors C3, C4, R4, C1, C2, C7, EC8, XS1 and XS2, all of which are connected to its pins. Terminal XS1 is also connected to resistor R1 and terminal XS2 is also connected to resistor R3.

[0066] The third GPRS module includes chip N2 and capacitors C9, C11, R26, C8, C10, C12, EC7, XS3, and XS4, all of which are connected to its pins. Terminal XS3 is also connected to resistor R14, and terminal XS4 is also connected to resistor R21.

[0067] In this embodiment, the communication module includes:

[0068] Communication with GPRS module: RS232 communication is achieved through the SPX3223EEY chip, transmitting the 101 protocol to complete data interaction with the GPRS module, including providing 101 protocol communication capability through the analog repeater station, and realizing functions such as initialization and general access.

[0069] In a preferred embodiment of this utility model, a serial port server is connected: the debugging interfaces of multiple GPRS modules are aggregated and connected to the serial port server, which facilitates the computer to receive and process data using software, thereby realizing data transmission between the tooling and the computer.

[0070] In a preferred embodiment of the present invention, the current sampling module includes four sampling sub-units, wherein the first sampling sub-unit includes an amplifier U1A and resistors R6, R7, R10 and R9, which are all connected to its pins. Resistor R10 is also connected to capacitor C37 and resistor R9 is also connected to capacitor C33.

[0071] The second sampling subunit includes amplifier U1B and resistors R17, R19, R23 and R22, all of which are connected to its pins. Resistor R23 is also connected to capacitor C38, and resistor R22 is also connected to capacitor C34.

[0072] The third sampling subunit includes amplifier U1C and resistors R27, R28, R32 and R30, all connected to its pins. Resistor R32 is also connected to capacitor C39, and resistor R30 is also connected to capacitor C35.

[0073] The fourth sampling subunit includes amplifier U1D and resistors R39, R42, R46 and R45, all connected to its pins. Resistor R46 is also connected to capacitor C40, and resistor R45 is also connected to capacitor C36.

[0074] In this embodiment, the current sampling module uses a 0.05R precision resistor to convert the current into voltage, which is then amplified by the AD8604 precision operational amplifier and connected to the ADC inside the MCU chip. This is used to measure the power supply current of the GPRS module to determine whether its power consumption is qualified. At the same time, it is necessary to ensure that the sampling resistor does not affect the normal use of the power supply.

[0075] In a preferred embodiment of this utility model, the GPRS test antenna is provided by the tooling. The antenna needs to be easy to replace and its base needs to be fixed to avoid burning out the repeater station or module due to the metal end of the antenna accidentally touching the power supply.

[0076] This fixture can solve the power supply problem for testing:

[0077] 1. Multiple power supply requirements: The fixture needs to provide a stable power supply for multiple GPRS modules at the same time. For example, the document requires that each fixture board can provide 12V power to 4 modules at the same time. After two boards are connected in parallel, they need to meet the requirements of 8 sets of equipment for simultaneous testing. This requires solving the power distribution and stability issues to ensure that each module can obtain sufficient and stable voltage and avoid affecting the module test results due to insufficient power supply or fluctuations.

[0078] 2. Power compatibility and safety: Ensure that the terminal specifications and wiring sequence of the power input are compatible with the relay station, and at the same time ensure the safety of the 220V mains power connection to prevent damage to the module or tooling itself due to power problems. For example, avoid power short circuits, overvoltage and other situations that may damage the equipment.

[0079] This tooling can solve the problem of test communication and interaction:

[0080] 1. Simulated forwarding station capability: It must be able to simulate a forwarding station to provide 101 protocol communication capabilities, including accurate parsing, initialization, and general routing functions. Furthermore, the modified forwarding station program must be able to adapt to the testing requirements of the tooling for multiple sets of equipment (e.g., 4 sets) at the same time, ensuring the accuracy and stability of communication, so as to comprehensively test the communication performance of the GPRS module in actual working scenarios.

[0081] 2. Communication and debugging interface processing: On the one hand, the communication interface of the tooling board must be compatible with the communication interfaces of the GPRS module and the relay station to ensure smooth data transmission; on the other hand, the debugging interfaces of multiple communication modules must be aggregated to the serial port server to facilitate the computer software to receive and process data, and realize the effective collection and monitoring of module debugging information.

[0082] This fixture can solve the problem of power consumption measurement and judgment:

[0083] 1. Precise measurement of module current: It can accurately measure the power supply current of the GPRS module. By using appropriate circuit design and components, such as using a 0.05R precision resistor to convert the current into voltage, amplifying it through an AD8604 precision operational amplifier, and then connecting it to the ADC inside the MCU, an accurate current value can be obtained, providing a reliable basis for power consumption calculation.

[0084] 2. Power Consumption Judgment and Display: The measured power consumption is displayed on the test fixture software, and the power consumption is accurately judged to be qualified according to the set standard. At the same time, the possible errors of different modules should be taken into account, and the accuracy of the judgment is improved by using the coefficient adjustment function. For example, the coefficients are adjusted for the error of the current sampling resistor of the 4-channel module itself and the resistor error of adjusting the operational amplifier amplification factor. The coefficients are written to the internal flash memory of the MCU through the interface software.

[0085] This tooling can solve the functional problems of tooling testing software:

[0086] 1. Simultaneous testing and information display of multiple devices: The tooling testing software should be able to test 8 sets of devices simultaneously and comprehensively display various information such as network access information, power consumption, signal strength, and IP port settings, so that testers can intuitively understand the working status of each module and quickly determine whether the module is working properly.

[0087] 2. Configuration and control functions: The software should have the function of importing configuration information tables and setting up information for 8 sets of devices at the same time. It should also be able to control each GPRS module individually, such as restarting the device and modifying communication parameters, to meet different testing needs and improve the flexibility and efficiency of testing.

[0088] This tooling can solve interface and connection problems:

[0089] 1. Display Interface Design: Design a suitable display interface, such as using high-brightness, long-life LEDs as indicator lights, and specifying their flashing frequency during normal operation (e.g., 1Hz). The indicator lights can intuitively display the operating status of the tooling and modules, making it convenient for testers to quickly observe the equipment status during the test.

[0090] 2. Terminal Blocks and Connection Stability: Ensure that the terminal block specifications and wiring sequence of the GPRS module are compatible with the repeater station, guarantee the stability of the connection, and prevent test interruption or data transmission errors due to loose connections during testing. At the same time, it should facilitate the plugging and unplugging of the module to improve testing efficiency.

[0091] It should be noted that this application only improves the structure of the testing fixture and does not improve the control program. The control program and electrical components involved are all existing technologies.

[0092] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic testing fixture for communication modules, characterized in that: The device includes a fixture housing, a fixture plate, a control module, a GPRS test antenna, a switching power supply, and several test interfaces. The fixture plate is installed inside the fixture housing, and the control module is installed on the fixture plate. The switching power supply is located on one side of the fixture plate. The control module is connected to several test interfaces by circuitry. The test interfaces are also connected to the GPRS test antenna. Several interface holes are provided on the fixture housing to accommodate the test interfaces.

2. The automatic testing fixture for a communication module according to claim 1, characterized in that: The control module includes a main control module, a communication module, an antenna interface module, a current sampling module, and a serial port server. The communication module, antenna interface module, current sampling module, and serial port server are all electrically connected to the main control module.

3. The automatic detection fixture for a communication module according to claim 2, characterized in that: The main control module includes two main control chip circuits. One of the main control chip circuits includes a main control chip U2A and resistors R11, R13, R15, R16, R18, R20, R35, R34, R44 and capacitor C21, all of which are connected to its pins. Another main control chip circuit includes a main control chip U2B, a resistor R48, capacitors C31, C22, C23, C24, C25, C26, C27, C28, C29, C30, C32, an inductor L2, and a resistor R49. The VBAT pin of the main control chip U2B is connected to resistor R48 and capacitor C31 respectively. Resistor R48 and capacitor C31 are both connected to VCC 3.

3. Capacitors C22, C23, C24, C25, C26, and C27 are connected in parallel and are all connected to VCC 3.

3. Capacitors C28, C29, C30, and C32 are connected in parallel. Capacitors C28 and C29 are each connected to one end of resistor R49, and capacitors C29 and C32 are connected to the other end of resistor R49.

4. The automatic testing fixture for a communication module according to claim 1, characterized in that: The switching power supply circuit includes power supply BAT1, diode D2, diode D4, resistor R5, capacitor C5, capacitor C6, electrolytic capacitor EC3, electrolytic capacitor EC4, electrolytic capacitor EC5, electrolytic capacitor EC6, capacitor C20, capacitor C17, capacitor C18, capacitor C19, capacitor C15, resistor R36, resistor R40, resistor R41, capacitor C13, chip U3, capacitor C16, resistor R37, resistor R38, capacitor E1, capacitor E2, capacitor C14, inductor L1, and diode D3. Power supply BAT1 is connected to diode D2, ... Diodes D4 and D2 are connected to capacitors C5, C5, C5, C5, C6, EC3, EC4, EC5, and EC6 via resistor R5. Diode D4 is connected to capacitors C20, C17, C18, C19, and C15, resistors R36 and R40, and chip U3. Chip U3 is also connected to resistor R41, capacitors C13 and C16, resistors R37 and R38, capacitors E1 and E2, capacitor C14, inductor L1, and diode D3.

5. The automatic testing fixture for a communication module according to claim 2, characterized in that: The communication module includes three GPRS modules, which communicate with the main control module. The first GPRS module includes a chip N3 and capacitors C44, C45, resistor R12, C42, C43, C46, ​​EC9, and terminal P6, all of which are connected to its pins. The second GPRS module includes chip N1 and capacitors C3, C4, R4, C1, C2, C7, EC8, XS1 and XS2, all of which are connected to its pins. Terminal XS1 is also connected to resistor R1 and terminal XS2 is also connected to resistor R3. The third GPRS module includes chip N2 and capacitors C9, C11, R26, C8, C10, C12, EC7, XS3, and XS4, all of which are connected to its pins. Terminal XS3 is also connected to resistor R14, and terminal XS4 is also connected to resistor R21.

6. The automatic testing fixture for a communication module according to claim 2, characterized in that: The current sampling module includes four sampling sub-units. The first sampling sub-unit includes an amplifier U1A and resistors R6, R7, R10 and R9, which are all connected to its pins. Resistor R10 is also connected to capacitor C37, and resistor R9 is also connected to capacitor C33. The second sampling subunit includes amplifier U1B and resistors R17, R19, R23 and R22, all of which are connected to its pins. Resistor R23 is also connected to capacitor C38, and resistor R22 is also connected to capacitor C34. The third sampling subunit includes amplifier U1C and resistors R27, R28, R32 and R30, all connected to its pins. Resistor R32 is also connected to capacitor C39, and resistor R30 is also connected to capacitor C35. The fourth sampling subunit includes amplifier U1D and resistors R39, R42, R46 and R45, all connected to its pins. Resistor R46 is also connected to capacitor C40, and resistor R45 is also connected to capacitor C36.

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