Interference immunity test equipment for signal conversion devices

Abstract

The utility model discloses a kind of anti-interference detection equipment of signal conversion device, it is related to detection equipment technical field, solve the problem of low efficiency caused by repeated disassembly and connection instrument in existing detection. Scheme main point includes: integrated detection host computer built-in multi-protocol communication module and fault injection module;Switching unit connects the device port to be measured;Anti-interference generator output end connects switching unit interference input interface and input end is controlled;High-speed data recorder connects communication monitoring interface;Determination module compares state and criterion in real time. The utility model realizes multiple types of interference automatic switching and accurate application, avoids manual operation and improves test efficiency, for automatic execution anti-interference test and quantitative evaluation performance.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology. More specifically, this utility model relates to an immunity testing device for a signal conversion device. Background Technology

[0002] The signal conversion device is used for testing digital intelligent stations. It is a signal extender that enables the conversion device to form a high-resolution communication link with the communication card in the computer host, and expands the data of the fiber optic port, thereby improving the functional testing scale and performance of protocols such as IEC61850-9-2, GOOSE, and custom protocols.

[0003] The signal conversion device has a plug-in structure, consisting of a power module, a communication module, and an optical interface module, which can be easily configured according to user needs. The device can be configured with up to 3 communication modules, each with 2 transceiver fiber optic interfaces for communication with the host. Each communication module can be configured with 1 to 3 optical interface modules, each with 4 transceiver fiber optic interfaces.

[0004] Testing signal conversion devices includes four electromagnetic compatibility immunity tests: electrostatic discharge immunity test, electrical fast transient / burst immunity test, damped oscillation immunity test, and voltage variation immunity test. The existing testing method involves using different testing instruments to connect to the device under test for separate testing. This results in the signal lines of different devices having to be disconnected or reconnected to the device under test each time, which is a cumbersome process. Utility Model Content

[0005] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.

[0006] To achieve these objectives and other advantages according to the present invention, an immunity detection device for a signal conversion apparatus is provided, comprising:

[0007] An integrated testing host with a built-in multi-protocol communication module and fault injection module;

[0008] The switching unit is connected to the power port and communication port of the signal conversion device under test via a power bus and an optical fiber bus, respectively.

[0009] An immunity generator, whose output is connected to the interference input interface of the switching unit, and whose input is controlled by the fault injection module;

[0010] A high-speed data logger, whose input end is connected to the communication monitoring interface of the signal conversion device under test, and whose output end is connected to the judgment module;

[0011] The judgment module interconnects with the multi-protocol communication module to compare the communication status with preset performance criteria in real time.

[0012] Preferably, the switching unit includes:

[0013] The fiber channel switching submodule is connected to the LC interface of the signal conversion device under test via a fiber optic bus, and supports online reconfiguration of the multimode fiber channel;

[0014] The power disturbance coupling submodule is connected in series in the power supply circuit via the power bus to achieve programmable voltage fluctuations.

[0015] Preferably, the interference immunity generator is connected to the interference input interface of the switching unit via a coaxial cable, and the interference type switching is triggered by the fault injection module via a digital control bus.

[0016] Preferably, the high-speed data logger includes:

[0017] The optical signal decoding unit is directly connected to the optical fiber communication link of the signal conversion device under test.

[0018] A timestamp unit records communication interruption events at a preset duration resolution.

[0019] Preferably, it also includes an environmental simulation chamber, the signal conversion device to be tested is disposed inside the environmental simulation chamber, and a temperature and humidity sensor is also disposed inside the environmental simulation chamber, the temperature and humidity sensor being connected to the integrated detection host via a feedback cable.

[0020] Preferably, the immunity generator includes: an electrical fast transient / burst tester, a damped oscillating wave tester, and an electrostatic discharge tester, wherein the output terminals of the electrical fast transient / burst tester and the damped oscillating wave tester are connected in parallel to a programmable selector, and the programmable selector selects the interference type through relay switching logic.

[0021] Preferably, the switching unit includes:

[0022] Port adapter module, which provides LC fiber optic interface and power terminal;

[0023] A signal routing circuit that directionally couples the output of the immunity generator to the power supply terminal and / or the LC fiber optic interface.

[0024] This invention includes at least the following beneficial effects: the immunity testing device controls the injection of multiple types of interference through an integrated host, avoiding manual replacement of test equipment; the directional coupling mechanism of the switching unit enables precise application of power / communication port interference; high-resolution timestamp recording and real-time criterion comparison ensure the accuracy of quantitative evaluation of immunity performance.

[0025] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the network topology of the anti-interference detection device described in this utility model. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0028] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0029] like Figure 1 As shown, this utility model provides an immunity detection device for a signal conversion device, comprising:

[0030] An integrated testing host with a built-in multi-protocol communication module and fault injection module;

[0031] The switching unit is connected to the power port and communication port of the signal conversion device under test via a power bus and an optical fiber bus, respectively.

[0032] An immunity generator, whose output is connected to the interference input interface of the switching unit, and whose input is controlled by the fault injection module;

[0033] A high-speed data logger, whose input end is connected to the communication monitoring interface of the signal conversion device under test, and whose output end is connected to the judgment module;

[0034] The judgment module is interconnected with the multi-protocol communication module to compare the communication status with preset performance criteria in real time.

[0035] Specifically, the integrated testing host incorporates a multi-protocol communication module (optionally an industrial-grade communication card supporting IEC61850-9-2 / GOOSE protocol) and a fault injection module (which can be an FPGA programmable logic controller). The switching unit connects via a power bus (cross-sectional area ≥2.5mm²). 2The power supply port (DC 24V±10%) and LC communication port of the device under test are connected via a copper core cable and an optical fiber bus (OM3 multimode fiber). The input of the immunity generator receives commands from the fault injection module via an RS-485 digital control bus, and the output is connected to the BNC interference input interface of the switching unit via a 50Ω coaxial cable. The ESD-dedicated port of the immunity generator is connected to an electrostatic discharge gun head (compliant with IEC 61000-4-2 standard) via a coaxial cable. During assembly, the integrated testing host is placed on the upper layer of the equipment cabinet, the switching unit is installed on the test bench rail, and the coaxial cable length is ≤1m to reduce signal attenuation.

[0036] The high-speed data logger (sampling rate ≥ 1 GS / s) input is connected to the fiber optic communication monitoring interface of the device under test via an SFP+ optical module. Its optical signal decoding unit uses an NRZ decoding chip (such as MAX32690), and the timestamp unit records communication interruption events at a resolution of 10 μs. The judgment module (based on an ARM Cortex-M7 processor) is interconnected with the multi-protocol communication module via Ethernet. Real-time performance criteria for comparison include: a communication bit error rate threshold ≤ 10. -6 The interruption duration threshold is ≤100ms. During assembly, the data logger and decision module are integrated into a 19-inch chassis, and the fiber optic patch cord uses an LC-LC interface with a length ≤0.5m. During testing, the synchronization of interrupt recording and decision is verified by injecting EFT pulses with a duration of 15ns-300ns.

[0037] The internal signal routing circuit of the switching unit (based on an RF relay matrix) directionally couples the output of the immunity generator to two paths: ① power supply terminal (coupling capacitor 100pF); ② LC fiber optic interface (via an electro-optic conversion module). The fault injection module triggers four types of interference in a preset sequence: electrical fast transient bursts (repetition frequency 5kHz), damped oscillations (frequency 1MHz), electrostatic discharge (contact discharge 8kV), and voltage fluctuations (dropout amplitude 40%). During assembly, the power disturbance coupling submodule is connected in series in the power supply circuit, ≤20cm from the power port of the device under test; the fiber optic channel switching submodule achieves channel reconfiguration through hot-swappable SFP modules.

[0038] When performing an electrostatic discharge (ESD) immunity test, the fault injection module sends a command to the immunity generator to activate the ESD tester. The ESD gun head contacts the preset discharge point of the device under test, and the ESD pulse is transmitted through the coaxial cable connected to the immunity generator. The switching unit isolates other interference paths (power / communication ports), the high-speed data logger monitors the communication link in real time, the optical signal decoding unit detects communication errors or interruptions, the timestamp unit records the interruption event, and the judgment module compares the communication status with the preset criteria and outputs an immunity level report.

[0039] During the electrical fast transient / burst immunity test, the fault injection module sends a command to the programmable selector to switch to the electrical fast transient / burst tester (EFT). The immunity generator outputs EFT pulses, and the signal routing circuit of the switching unit selects the coupling path. The power port is coupled to the power bus through a high-voltage ceramic capacitor (to achieve voltage transients). The communication port converts the electrical pulses into optical interference via an electro-optical conversion module and injects it into the fiber optic link. The high-speed data logger collects communication data and records communication frame loss events caused by EFT pulses. The timestamp unit records the start / end time of the interruption. The judgment module analyzes the communication bit error rate and interruption duration in real time, compares them with the threshold, and generates a test report.

[0040] During the damped oscillating wave immunity test, the fault injection module sends a command to trigger the programmable selector, switching to the damped oscillating wave tester. The immunity generator outputs an oscillating wave signal (amplitude set according to the standard). The signal routing circuit couples the oscillating wave to the power supply terminal and the LC fiber optic interface respectively. The power supply terminal is directly injected into the power supply circuit in series, and the LC fiber optic interface is injected into the optical communication link through the electro-optic conversion module. The high-speed data logger monitors communication anomalies, the optical signal decoding unit detects CRC errors or signal distortion, and the timestamp unit marks communication interruptions during the duration of the oscillating wave. The judgment module compares the communication performance in real time (such as protocol response timeout) and outputs a conclusion on whether the immunity requirements are met.

[0041] During voltage fluctuation immunity testing, the fault injection module sends a command to the power disturbance coupling submodule of the switching unit. The power disturbance coupling submodule directly adjusts the power supply circuit, generating voltage dips, short interruptions, or fluctuations. The high-speed data logger captures communication anomalies during voltage changes and records the communication interruption events caused by voltage drops and their duration. The judgment module generates a voltage immunity test report based on preset criteria.

[0042] All tests are centrally scheduled by the integrated testing host, and the fault injection module remotely switches interference types and paths, avoiding manual wiring. The high-speed data logger and the judgment module work together in real time to ensure data timeliness.

[0043] The immunity testing equipment uses an integrated host to uniformly control the injection of multiple types of interference, avoiding the need for manual replacement of test equipment; the directional coupling mechanism of the switching unit enables the precise application of power / communication port interference; high-resolution timestamp recording and real-time criterion comparison ensure the accuracy of quantitative evaluation of immunity performance.

[0044] Furthermore, the switching unit includes:

[0045] The fiber channel switching submodule is connected to the LC interface of the signal conversion device under test via a fiber optic bus, and supports online reconfiguration of the multimode fiber channel;

[0046] The power disturbance coupling submodule is connected in series in the power supply circuit via the power bus to achieve programmable voltage fluctuations.

[0047] Specifically, the fiber optic channel switching submodule is connected to the LC interface of the signal conversion device under test (compliant with IEC 61754-20 standard) via an OM4 multimode fiber optic bus, and the physical connection is achieved using an industrial-grade LC fiber optic adapter. The channel reconfiguration function is implemented by a programmable optical switch matrix, supporting online switching of 4 channels (switching delay ≤ 50ms). The control signals of the optical switch matrix receive commands from the host computer via an RS-232 bus. During assembly, the submodule is installed in an anti-static box on the test bench, with fiber optic patch cords ≤ 1m in length to reduce optical attenuation. During operation, when a communication channel needs to be switched, the fault injection module sends a command to cause the optical switch matrix to complete the path switching within 10ms, while maintaining normal communication on other channels. During testing, a 1550nm optical signal is injected to verify a channel isolation ≥ 40dB.

[0048] The power disturbance coupling submodule is connected in series in the power supply circuit and uses a cross-sectional area of ​​4mm². 2 The device features a copper wire power bus (withstanding AC 300V) and a built-in programmable AC power disturbance. The disturbance can generate voltage fluctuations (range ±20% of rated voltage), short interruptions (duration 0.5 seconds), and voltage dips (amplitude 70% of rated value), with a control accuracy of ±1V. During assembly, the submodule should be placed in a shielded metal box, ≤20cm from the power port of the device under test, with a grounding resistance ≤0.1Ω. During operation, the fault injection module sends disturbance parameters (e.g., "voltage dips to 18V / lasts 100ms") via the CAN bus, and the IGBT power transistors within the disturbance adjust the output voltage according to the instructions. Testing was conducted using a resistive load (1kW power) to verify a voltage drop response time ≤5ms.

[0049] Furthermore, the interference immunity generator is connected to the interference input interface of the switching unit via a coaxial cable, and its interference type switching is triggered by the fault injection module via a digital control bus.

[0050] Specifically, the immunity generator is connected to the interference input interface of the switching unit via a coaxial cable. This coaxial cable can be a 50Ω impedance RG-58 type cable (copper core conductor, polyethylene insulation), with a length ≤1m to reduce signal attenuation. A BNC connector can be used for the interference input interface to ensure impedance matching. During assembly, one end of the coaxial cable is fixed to the output port of the immunity generator (located on the rear panel of the device), and the other end is connected to the interference input interface of the switching unit (mounted on the metal casing of the test bench). The cable bending radius should be ≥10 times the outer diameter to avoid damage. During operation, when interference signals (such as pulse groups or oscillations) are generated by the immunity generator, they are transmitted to the switching unit via the coaxial cable, with signal attenuation controlled within ≤3dB. During testing, a network analyzer is used to verify that the cable's voltage standing wave ratio (VSWR) at 100MHz is ≤1.5.

[0051] Specifically, the interference type switching is triggered by the fault injection module via a digital control bus. This bus can be an RS-485 standard (9600bps baud rate) using twisted-pair cable (copper conductor and PVC insulation). The fault injection module can be an FPGA-based programmable controller, sending hexadecimal instruction codes (e.g., "01" representing electrical fast transient / burst) via the bus. During assembly, the digital control bus cable is led out from the output terminal (internal slot) of the fault injection module of the integrated detection host and connected to the control interface of the immunity generator (located on the side of the device). The bus length is ≤2m and a ferrite core is added to suppress interference. During operation, the fault injection module sends switching commands according to a preset test sequence. The immunity generator responds and switches the interference type (e.g., from electrostatic discharge to damped oscillating wave) within ≤100ms. The test method includes monitoring the change in the interference output waveform with an oscilloscope after sending the command, with a delay ≤10ms.

[0052] The immunity generator ensures signal transmission integrity and reduces test errors through standardized coaxial cable connections; the digital control bus triggering mechanism enables rapid remote switching of interference types, avoiding manual operation and improving test consistency and reliability.

[0053] Furthermore, the high-speed data logger includes:

[0054] The optical signal decoding unit is directly connected to the optical fiber communication link of the signal conversion device under test.

[0055] A timestamp unit records communication interruption events at a preset duration resolution.

[0056] Specifically, the optical signal decoding unit is directly connected to the fiber optic communication link of the signal conversion device under test (SDD), and connected to OM3 multimode fiber (core diameter 50 / 125μm) via an LC interface. An SFP+ optical module can be used for photoelectric conversion (wavelength 1310nm, rate 1.25Gbps), and the decoding chip uses an NRZ encoder / decoder (compatible with IEC 62439-3 protocol). During assembly, the optical module is inserted into the SFP+ slot on the front panel of the high-speed data logger, and one end of a fiber optic patch cord (length ≤0.5m) is connected to the communication monitoring interface of the SDD device, and the other end is connected to the optical module. During operation, the optical signal, after photoelectric conversion, is parsed into Ethernet data frames in real time by the decoding chip, and the communication bit error rate detection threshold is set to ≤10. -9 During testing, optical power perturbations ranging from -5dBm to -10dBm were injected to verify decoding stability.

[0057] The timestamp marking unit records communication interruption events at a resolution of 10μs, using an FPGA processor (main frequency ≥200MHz) with a built-in high-precision clock source (error ±1ppm). The interruption judgment threshold is ≥3 consecutive frame losses or signal loss duration ≥100μs. During assembly, this unit is integrated into the internal circuit board of the high-speed data logger (PCB material is FR-4), and the clock source uses a temperature-controlled crystal oscillator (temperature stability ±0.5ppm). During operation: when the optical signal decoding unit detects a communication abnormality, the FPGA immediately records the current timestamp (format in UTC microseconds) and marks the abnormality type (such as frame loss, CRC error). The testing method includes injecting EFT pulses with a duration of 15ns-300ns and synchronously verifying the timestamp recording error using an oscilloscope.

[0058] The optical signal decoding unit enables real-time signal parsing of the optical fiber link, ensuring the integrity of the original data; the 10μs-level timestamp marking unit accurately quantifies the communication interruption delay, providing traceable quantitative data for the anti-interference performance, which helps to improve the reliability of the detection results.

[0059] Furthermore, it also includes an environmental simulation chamber, in which the signal conversion device to be tested is installed. The environmental simulation chamber is also equipped with a temperature and humidity sensor, which is connected to the integrated detection host via a feedback cable.

[0060] Specifically, the environmental simulation chamber uses a cold-rolled steel plate welded enclosure (1.5m × 1.5m × 1.8m in size), with a 10mm thick flame-retardant polyurethane insulation layer on the inner wall. The integrated testing host is installed outside the chamber, and the signal conversion device under test is fixed to the insulation testing platform in the middle of the chamber (platform size 0.6m × 0.6m). During operation, the temperature inside the chamber can be adjusted within the range of -20℃ to +70℃, the humidity can be controlled within the range of 30%RH to 95%RH, and the temperature change rate is 1℃ / min.

[0061] The temperature and humidity sensor (a composite probe combining a PT100 platinum resistance temperature sensor and a capacitive humidity sensor can be selected) is installed 0.3m directly above the device under test. The probe has an IP67 protection rating. The sensor is connected via a four-core shielded feedback cable (0.75mm diameter). 2 The cable (made of tin-plated copper wire with a PVC sheath) connects to the AI ​​module (16-bit resolution) of the integrated testing host. During assembly, the cable is laid along the inner side of the cabin, with a bending radius ≥ 8 times the wire diameter, and the connector uses a crimp-type aviation plug. During operation: the sensor collects data every 5 seconds, and the host automatically adjusts the temperature control device according to preset thresholds (e.g., temperature exceeding the limit ±2℃ or humidity exceeding the limit ±5%RH). During testing, it runs continuously for 24 hours under 40℃ / 85%RH conditions, verifying data drift ≤0.1℃.

[0062] The integrated testing unit has a built-in PID controller. After receiving sensor data via a feedback cable, it: ① outputs a 0-10V signal to drive the compressor for cooling or the resistance wire for heating for temperature control; ② outputs a PWM wave to adjust the ultrasonic atomization of the humidifier for humidity control. During assembly, the actuators (compressor / heater / humidifier) ​​are placed in a separate compartment at the bottom of the chamber, and the feedback cable and actuator cable are laid in separate channels to avoid interference. During operation, when the set temperature is 55℃, the unit automatically starts the heater and heats up at a rate of 1℃ / min. After reaching the target value, it switches to a constant temperature mode (fluctuation ±0.5℃). The testing method includes setting a step humidity change (50%RH→80%RH) and recording the response time ≤3min.

[0063] The environmental simulation chamber provides controllable temperature and humidity testing conditions, expanding the scenarios for immunity testing; real-time feedback from temperature and humidity sensors and closed-loop control of the host ensure accurate and stable environmental parameters, eliminating errors caused by human intervention.

[0064] Furthermore, the immunity generator includes: an electrical fast transient / burst tester, a damped oscillating wave tester, and an electrostatic discharge tester, wherein the output terminals of the electrical fast transient / burst tester and the damped oscillating wave tester are connected in parallel to a programmable selector, and the programmable selector selects the interference type through relay switching logic.

[0065] Specifically, the immunity generator includes three types of testing instruments: an electrical fast transient / burst tester (output pulse 5 / 50ns, repetition frequency 5kHz), a damped oscillatory wave tester (frequency 1MHz / 100kHz), and an electrostatic discharge tester (voltage range 0.1kV-30kV). The outputs of the electrical fast transient / burst tester and the damped oscillatory wave tester are connected in parallel to the input port of the programmable selector via a 50Ω coaxial cable. The electrostatic discharge tester is connected to the electrostatic discharge gun head via a separate coaxial cable.

[0066] The programmable selector uses a 4-input / 1-output RF relay matrix (isolation ≥60dB). Its input terminals are connected in parallel to the output terminals of the electrical fast transient / burst tester and the damped oscillation tester (via T-type BNC connectors). The relay switching logic is controlled by the TTL level signal (high level >2.4V trigger) of the fault injection module. During assembly, the programmable selector is fixed in the middle of the immunity generator cabinet, and the input and output terminals are connected using coaxial cables (model RG-316) with a length ≤0.5m. Example of operation: When the fault injection module sends a "01" command, the relay matrix switches the path to the electrical fast transient / burst tester within ≤10ms, and the output pulse is transmitted to the switching unit via the main output port.

[0067] The relay switching logic is based on dual-redundant control: the main control circuit receives RS-232 commands (115200bps baud rate) from the fault injection module, and the backup circuit receives emergency stop signals via hardwired connection. Single-pole double-throw relays (silver-nickel alloy contact material, 5A current carrying capacity) can be selected. During assembly, the control board is installed in the slot at the rear of the programmable selector, and the signal lines use shielded twisted-pair cable (0.5mm diameter). 2 During operation: When the fault injection module sends the hexadecimal command "02", the main control circuit drives the relay to switch to the damped oscillation wave tester path, and simultaneously monitors the output voltage standing wave ratio (VSWR) to be ≤1.5 (if it exceeds the limit, the backup circuit is triggered to switch). The test method includes continuously sending 100 switching commands, and the success rate of the operation is statistically ≥99.9%.

[0068] The parallel connection of multiple types of interference sources can reduce redundant wiring; the relay switching mechanism of the programmable selector enables millisecond-level switching of interference types, ensuring the automated execution of the immunity test sequence.

[0069] Furthermore, the switching unit further includes:

[0070] Port adapter module, which provides LC fiber optic interface and power terminal;

[0071] The signal routing circuit directionally couples the output of the immunity generator to the power supply terminal and the LC fiber optic interface.

[0072] Specifically, the port adapter module provides an LC fiber optic interface (compliant with IEC 61754-20 standard) and power terminals (rated current 10A / withstand voltage 300V). The fiber optic interface uses a phosphor bronze ferrule (insertion loss ≤0.2dB), and the power terminals are copper alloy screw-type (contact resistance ≤5mΩ). During assembly, the module is mounted on the test bench rail, with the fiber optic interface facing forward for easy insertion and removal. The power terminals have a 4mm² cross-sectional area at the rear. 2The power bus (made of oxygen-free copper) is used. During operation: the LC fiber optic patch cord of the device under test is inserted into the module interface, the power cord is connected to the terminal and tightened to a torque of 0.6 N·m. A 5 N axial tensile force is applied during testing to verify connection stability.

[0073] The signal routing circuit, based on an RF relay matrix (isolation ≥60dB), directionally couples the output (impedance 50Ω) of the immunity generator to two paths: ① Power terminal: coupled via a 100pF high-voltage ceramic capacitor (withstand voltage 4kV); ② LC fiber optic interface: injecting optical interference via an electro-optic conversion module (wavelength 1310nm, modulation bandwidth ≥100MHz). During assembly, the circuit board is placed in an internal shielded box within the module, with the coupling capacitor ≤3cm from the power terminal, and the heatsink of the electro-optic conversion module exposed. Example of operation: When the power coupling path is selected, the relay couples the EFT pulse to the power circuit via the capacitor, while simultaneously isolating other paths.

[0074] The fault injection module controls the signal routing circuit via a CAN bus (500kbps baud rate) and sends command codes to select the coupling path (e.g., "01" for the power terminal, "10" for the fiber optic interface). The relay drive voltage is 24VDC (action time ≤5ms), and the contact material is silver tin oxide (electrical life ≥10). 5 (Times). During assembly, the CAN bus is led out from the integrated testing host and connected to the DB9 interface at the rear of the module. The bus length is ≤2m and a ferrite core is added. During operation: when selecting the electrostatic discharge path, the relay switches to directly connect the electrostatic discharge gun head to the immunity generator, while disconnecting other paths; when switching the fiber optic path, the bias current of the electro-optic conversion module is activated. The testing method includes injecting a 2kV pulse into the power supply terminal and verifying the coupling efficiency ≥90% using a current probe.

[0075] The port adapter module uses a unified physical interface to reduce test preparation time; the directional coupling mechanism of the signal routing circuit enables precise selection of the application path for interference types, avoids manual wiring switching, and improves test repeatability.

[0076] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An immunity detection device for a signal conversion apparatus, characterized in that, include: An integrated testing host with a built-in multi-protocol communication module and fault injection module; The switching unit is connected to the power port and communication port of the signal conversion device under test via a power bus and an optical fiber bus, respectively. An immunity generator, whose output is connected to the interference input interface of the switching unit, and whose input is controlled by the fault injection module; A high-speed data logger, whose input end is connected to the communication monitoring interface of the signal conversion device under test, and whose output end is connected to the judgment module; The judgment module interconnects with the multi-protocol communication module to compare the communication status with preset performance criteria in real time.

2. The interference immunity detection device for the signal conversion apparatus as described in claim 1, characterized in that, The switching unit includes: The fiber channel switching submodule is connected to the LC interface of the signal conversion device under test via a fiber optic bus, and supports online reconfiguration of the multimode fiber channel; The power disturbance coupling submodule is connected in series in the power supply circuit via the power bus to achieve programmable voltage fluctuations.

3. The interference immunity detection device for the signal conversion apparatus as described in claim 1, characterized in that, The immunity generator is connected to the interference input interface of the switching unit via a coaxial cable, and its interference type switching is triggered by the fault injection module through the digital control bus.

4. The interference immunity detection device for the signal conversion apparatus as described in claim 1, characterized in that, The high-speed data logger includes: The optical signal decoding unit is directly connected to the optical fiber communication link of the signal conversion device under test. A timestamp unit records communication interruption events at a preset duration resolution.

5. The interference immunity detection device for the signal conversion apparatus as described in claim 1, characterized in that, It also includes an environmental simulation chamber, in which the signal conversion device to be tested is installed. The environmental simulation chamber is also equipped with a temperature and humidity sensor, which is connected to the integrated detection host via a feedback cable.

6. The interference immunity detection device for the signal conversion apparatus as described in claim 2, characterized in that, The immunity generator includes: an electrical fast transient / burst tester, a damped oscillating wave tester, and an electrostatic discharge tester. The outputs of the electrical fast transient / burst tester and the damped oscillating wave tester are connected in parallel to a programmable selector. The programmable selector selects the interference type through relay switching logic.

7. The interference immunity detection device for the signal conversion apparatus as described in claim 6, characterized in that, The switching unit includes: Port adapter module, which provides LC fiber optic interface and power terminal; A signal routing circuit that directionally couples the output of the immunity generator to the power supply terminal and / or the LC fiber optic interface.

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