Verification method and apparatus for a test system

Abstract

This application discloses a verification method and apparatus for a testing system, belonging to the field of testing technology. The verification method includes: applying a preset current to a conductor through a current injection probe in a first preset frequency band; obtaining a first verification result corresponding to the first preset frequency band using a verification device; determining target verification parameters and a target verification frequency band based on the first verification result if the first verification result meets the first preset verification conditions; applying a preset current to the conductor in the target verification frequency band through a current injection probe; obtaining a second verification result corresponding to the target verification frequency band using the verification device; and determining the verification result of the testing system based on the target verification parameters, the second verification result, and the second preset verification conditions. This application provides a realistic testing environment for verification testing, including power-on and conductor testing, through the verification device, making the verification results more accurate.

Description

Technical Field

[0001] This application relates to the field of testing technology, specifically to verification methods and apparatus for testing systems. Background Technology

[0002] In the field of electromagnetic compatibility testing, in order to ensure the stability and measurement accuracy of the Bulk Current Injection (BCI) test system, it is necessary to perform periodic checks on the BCI test system.

[0003] The verification method for related technologies is to perform verification under a standard 50-ohm load condition. However, this method does not take into account the influence of powered-on test samples and wiring harnesses, deviating from the actual test scenario, thus resulting in low test accuracy. Summary of the Invention

[0004] A method and apparatus for verifying a testing system are provided to improve the accuracy of testing system verification.

[0005] Firstly, a verification method for a test system is provided, executed by a verification device of the test system, the verification device comprising: a wire; the test system comprising a current injection probe; the current injection probe being connected to the wire; the method comprising: A preset current is applied to the conductor in the first preset frequency band by a current injection probe; Obtain the first verification result of the verification device in the first preset frequency band; If the first verification result meets the first preset verification conditions, the target verification parameters and target verification frequency band are determined based on the first verification result; A preset current is applied to the conductor in the target verification frequency band using a current injection probe; Obtain the second verification result of the verification device in the target verification frequency band; The verification results of the test system are determined based on the target verification parameters, the second verification results, and the second preset verification conditions.

[0006] In some embodiments, the verification device of the test system further includes a first verification module and a second verification module, the first verification module being electrically connected to the second verification module via a wire; the test system further includes a directional coupler electrically connected to a current injection probe; the first preset frequency band includes multiple frequency test points; the first verification result includes the monitoring voltage of the first verification module corresponding to the first preset frequency band, and the first forward power of the directional coupler corresponding to the first preset frequency band; The first preset verification condition includes: the monitoring voltage corresponding to a frequency test point in the first preset frequency band exceeds the preset voltage range.

[0007] In some embodiments, determining the target verification parameters and target verification frequency band based on the first verification result includes: If the monitoring voltage corresponding to a frequency test point in the first preset frequency band exceeds the preset voltage range, the first forward power corresponding to the target verification frequency band is selected as the target verification parameter; wherein, the target verification frequency band includes all frequency test points whose monitoring voltage exceeds the preset voltage range.

[0008] In some embodiments, the second verification result is the second forward power of the directional coupler in the target verification frequency band; Based on the target verification parameters, the second verification result, and the second preset verification conditions, the verification result of the test system is determined, including: Determine the target deviation based on the target verification parameters and the second forward power; If the target deviation is less than the preset deviation, the verification result of the test system is determined to be a pass. If the target deviation is greater than or equal to the preset deviation, the verification result of the test system is determined to be a failure.

[0009] Secondly, embodiments of this application also provide a verification device for a testing system, comprising: a wire; the testing system includes a current injection probe; the current injection probe is connected to the wire; The current injection probe is used to apply a preset current to the conductor; The verification device is used to: obtain a first verification result corresponding to the first preset frequency band after the current injection probe applies a preset current to the conductor in the first preset frequency band; and determine the target verification parameters and the target verification frequency band based on the first verification result if the first verification result meets the first preset verification conditions. And after the current injection probe applies a preset current to the conductor in the target verification frequency band, the second verification result corresponding to the verification device in the target verification frequency band is obtained; And based on the target verification parameters, the second verification result, and the second preset verification conditions, the verification result of the test system is determined.

[0010] In some embodiments, the verification device of the test system further includes a first verification module and a second verification module, the first verification module being electrically connected to the second verification module via a wire; the test system further includes a directional coupler electrically connected to a current injection probe; the first preset frequency band includes multiple frequency test points; the first verification result includes the monitoring voltage of the first verification module corresponding to the first preset frequency band, and the first forward power of the directional coupler corresponding to the first preset frequency band; The first preset verification condition includes: the monitoring voltage corresponding to a frequency test point in the first preset frequency band exceeds the preset voltage range.

[0011] In some embodiments, the verification device is also used for: If the monitoring voltage corresponding to a frequency test point in the first preset frequency band exceeds the preset voltage range, the first forward power corresponding to the target verification frequency band is selected as the target verification parameter; wherein, the target verification frequency band includes all frequency test points where the monitoring voltage exceeds the preset voltage range.

[0012] In some embodiments, the second verification result is the second forward power of the directional coupler in the target verification frequency band; The verification device is also used to: determine the target deviation based on the target verification parameters and the second forward power; If the target deviation is less than the preset deviation, the verification result of the test system is determined to be a pass. If the target deviation is greater than or equal to the preset deviation, the verification result of the test system is determined to be a failure.

[0013] In some embodiments, the first verification module includes: a voltage divider unit and a voltage follower; the voltage divider unit is electrically connected to the voltage follower; the voltage divider unit is used to divide the power supply to the target voltage when the verification device is powered on. A voltage follower is used to stably output a monitoring voltage based on a target voltage.

[0014] In some embodiments, the first verification module is the device under test for verification testing, and the second verification module is the load for verification testing.

[0015] Beneficial Effects: This application provides a verification method and apparatus for a testing system. The verification method includes: applying a preset current to a conductor in a first preset frequency band using a current injection probe; obtaining a first verification result corresponding to the first preset frequency band using a verification device; determining target verification parameters and a target verification frequency band based on the first verification result if the first verification result meets the first preset verification conditions; applying a preset current to the conductor in the target verification frequency band using a current injection probe; obtaining a second verification result corresponding to the target verification frequency band using the verification device; and determining the verification result of the testing system based on the target verification parameters, the second verification result, and the second preset verification conditions. The verification method provided by this application provides a realistic testing environment including power-on and conductors during the verification test. During the verification test, the target verification parameters and target verification frequency band are determined based on the first verification result and the first preset verification conditions. The verification result of the testing system is then determined based on the second verification result under the target verification frequency band test, the target verification parameters, and the second preset verification conditions. Therefore, by considering the influence of power-on and conductors during the verification test, the verification result is more accurate. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the principle structure of a BCI high current injection test system verification system provided in the embodiments of this application; Figure 2 This is a partial structural diagram of the verification device of the BCI high current injection test system provided in the embodiments of this application; Figure 3 This is a schematic diagram of a test setup provided in an embodiment of this application; Figure 4 This is a flowchart of a verification method for a testing system provided in the embodiments of this application; Figure 5 This is a schematic diagram of the overall process of a verification method for a testing system provided in the embodiments of this application; Figure 6 This is a flowchart of a verification and determination process provided in the embodiments of this application; Figure 7 This is a schematic diagram of a verification device for a testing system provided in an embodiment of this application; Figure 8 This is a schematic diagram of the circuit structure of a testing system verification device provided in the embodiments of this application; Figure 9 This is a schematic diagram of a verification result provided in an embodiment of this application. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application 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 this application. Furthermore, the terms "first" and "second" 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, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0021] The use of "applies to" or "configured to" in this application implies open and inclusive language, which does not exclude the applicability to or configuration to devices performing additional tasks or steps. Additionally, the use of "based on" implies openness and inclusivity, because processes, steps, calculations, or other actions "based on" one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0022] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0023] The applicant's research revealed that, in the field of electromagnetic compatibility testing, to ensure the stability and measurement accuracy of the BCI high current injection test system, it is necessary to conduct periodic checks on the BCI high current injection test system.

[0024] The verification method for related technologies is as follows: The current injection probe is clamped to a calibration fixture, with a 50Ω resistor connected to one end and a 20dB attenuator connected to the other. The power current injection probe is then connected to the 20dB attenuator. Next, electromagnetic compatibility testing software, such as EMC32, is opened, and the BCI calibration template is selected for calibration testing. The test frequency band is 0.1MHz-400MHz. After the test, the forward power value of the power current injection probe is obtained. By comparing the forward power value with the target power value, if it is within the allowable deviation range, the system verification is considered passed. However, this method is performed under a standard 50-ohm load condition and does not consider the addition of powered test samples and wiring harnesses. In actual testing, powered test samples and wiring harnesses are involved. Therefore, it is necessary to provide a verification method that takes into account actual test scenarios with powered samples and wiring harnesses.

[0025] In view of this, embodiments of this application provide a verification method and apparatus for a testing system. The verification method of the testing system provided by embodiments of this application provides a real test environment for verification testing, including power-on and wires, through a verification apparatus. During the verification test, target verification parameters and target verification frequency bands are determined based on a first verification result and a first preset verification condition. The verification result of the testing system is then determined based on a second verification result under the target verification frequency band test, the target verification parameters, and the second preset verification condition. Thus, by taking into account the influence of power-on and wires during the verification test, the verification result is more accurate.

[0026] It should be noted that the test system in this application is a high current injection test system.

[0027] Figure 1 This is a schematic diagram of the principle structure of a BCI high current injection test system verification system provided in the embodiments of this application. (See also...) Figure 1 The BCI high current injection test system verification system includes the BCI high current injection test system (i.e., the test system), the BCI high current injection test system verification device (i.e., the test system verification device), and other auxiliary equipment.

[0028] The BCI (Browser Injection Computation) high-current injection test system is a conducted immunity test method used to evaluate the immunity of electronic devices in radio frequency electromagnetic environments. Its core principle is to non-invasively couple simulated radio frequency interference current directly into the wiring harness of the device under test (DUT) to reproduce the interference effects of spatial radiation coupled to cables in a real environment. The BCI high-current injection test system mainly includes a signal generator, power amplifier, directional coupler, power probes (including forward and reverse power probes), a power meter, and a high-current injection probe (i.e., current injection probe). The directional coupler can be integrated into the power amplifier.

[0029] The system comprises a signal generator that produces an RF signal with a specified frequency (e.g., 0.1MHz, 10MHz, etc.) and a specified amplitude (e.g., -10dBm, -20dBm, etc.). This RF signal covers the test frequency band (e.g., 0.1MHz–400MHz) and supports 1kHz, 80% AM modulation. A power amplifier amplifies the low-power signal output from the signal generator to the required test level. A directional coupler provides a channel for monitoring forward and reverse power. A power meter and power probe are used to monitor the output or feedback power. A current injection probe, the core coupling device, consists of a coupling clamp, which is a clamp-on current transformer. The cable of the device under test (e.g., the wire for the verification transfer) passes through the coupling clamp.

[0030] The verification device of the BCI high current injection test system includes BCI verification device 1 (i.e., the first verification module), BCI verification device 2 (i.e., the second verification module) and wire harness (i.e., wire).

[0031] Figure 2 This is a partial structural diagram of the verification device of the BCI high current injection test system provided in this application embodiment. BCI verification device 1 acts as a sample (i.e., the device under test), which is more consistent with actual testing scenarios. BCI verification device 2 acts as a load, which is also more consistent with actual testing scenarios. The wiring harness is 1.5m long and consists of 4 wires: 2 inputs and 2 outputs. The external schematic diagrams of BCI verification device 1, BCI verification device 2, and the wiring harness are shown below. Figure 2 As shown.

[0032] Figure 3 This is a schematic diagram of a test setup provided in an embodiment of this application. Exemplarily, the test method employs a substitution method. The substitution method refers to the practice of not monitoring the actual current injected into the tested wiring harness in real time during the test. Instead, a correspondence between "forward power" and "injected current" (calibration curve) is established during the calibration phase. During formal testing, the signal source is directly controlled to output a specific forward power based on this calibration curve, thereby "replacing" the closed-loop control of the actual current and indirectly achieving the required test current level.

[0033] Specifically, the test setup for the substitution method is performed according to standard ISO 11452-4:2020. A current injection probe is used to clamp the wire harness (i.e., the conductor) under test at points of 15cm, 45cm, and 75cm, respectively, ensuring it is centered within the current injection probe loop. A schematic diagram of the test setup is shown below. Figure 3As shown in the diagram. 1 is the Device Under Test (DUT), placed on a 5cm insulating foam board; 2 is the test harness (i.e., the harness under test); 3 is the simulated load (e.g., the second verification module), placed on the 5cm insulating foam board and grounded; 4 is the excitation and monitoring system; 5 is the power supply; 6 is the Artificial Network (AN); 7 is the optical fiber; 8 is the high-frequency equipment (including signal generator, amplifier, and measuring instruments); 10 is the injection probe (at three locations: 15cm, 45cm, and 75cm); 11 is the grounding plate (overlapping with the shielding housing); 12 is a low relative permittivity material support, with a dielectric constant of... ≤1.4; 13 is the shielding housing; 14 is a 50Ω load.

[0034] Other auxiliary equipment includes a test computer (containing test software, such as EMC32), a benchtop multimeter, a photoelectric converter, a DC power supply, and an artificial network.

[0035] For example, the parameter configuration of the BCI high current injection test system verification system is shown in Table 1.

[0036] Table 1 Parameter Configuration Table

[0037] For example, the test frequency is set to 0.1MHz-400MHz, the modulation method is set to Continuous Wave (CW), the test level is set to Level 3 in standard ISO 11452-4:2020, the test step is set according to the requirements of ISO 11452-1:2015, and the test dwell time is set to 2s. The test step refers to the frequency interval between the signal generator jumping from one test frequency to the next during frequency scanning. The test step is set according to the requirements of ISO 11452-1:2015. For example, it can be set as follows: 0.1MHz-1MHz: 0.1MHz, 1MHz-10MHz: 1MHz, 10MHz-200MHz: 5MHz, 200MHz-400MHz: 10MHz, etc. Specific verification test settings requirements are as follows: (1) Test reference standard: ISO 11452-4:2020; (2) Test frequency range required: 0.1 MHz - 400 MHz; (3) Testing method: substitution method; (4) Dwell time: 2s; (5) Test level: Level 2 of ISO 11452-4:2020, as shown in Table 2.

[0038] Table 2 Examples of Test Severity Levels (BCI)

[0039] (6) Test steps: in accordance with ISO 11452-1:2015; (7) Test locations: 15cm, 45cm, 75cm; (8) Temperature requirement: 23℃±5℃; (9) Humidity requirements: 30%RH-60%RH.

[0040] Figure 4 This is a flowchart illustrating a verification method for a test system provided in an embodiment of this application. This application provides a verification method for a test system, applicable to test control systems, to accurately verify a high-current injection test system. This method can be executed by the controller or processor of the verification device for the test system (for example, the verification device for the test system can also be equipped with a control module, which can be a microcontroller or other control chip; specific configurations can be made according to actual conditions and are not specifically limited here). See also... Figure 4 The method includes the following steps: Step 110: Apply a preset current to the conductor in the first preset frequency band through the current injection probe.

[0041] The first preset frequency band can be any frequency band, such as the full band or a partial band, used for testing and verification. The specific settings can be configured according to actual conditions and are not limited here. For example, the first preset frequency band is 0.1MHz-400MHz.

[0042] The preset current is a high current, and the high current test level is ISO 11452-4:2020 Level 2. For example, 0.1MHz-1MHz: 33mA, 1MHz-3MHz: 100xf / 3 (f is in MHz)mA, 3MHz-200MHz: 100mA, 200MHz-400MHz: 100x200 / f (f is in MHz)mA, etc. The specific values ​​can be set according to the actual situation, and no specific limitation is made here.

[0043] The first preset frequency band includes multiple frequency test points. Applying a preset current to the conductor by the current injection probe within the first preset frequency band means that the current injection probe applies a preset current at each frequency test point within the first preset frequency band.

[0044] Step 120: Obtain the first verification result corresponding to the first preset frequency band of the verification device.

[0045] The first verification result is the first verification result detected by the current injection probe when the verification device is operating stably after injecting a preset current into the conductor in the first preset frequency band. The first verification result includes the verification result of the verification device detected at each frequency test point in the first preset frequency band.

[0046] Specifically, the first verification module, the wires, and the second verification module of the verification device are connected and powered on. When the current injection probe applies a preset current (i.e., injects a large current) to the wire in the first preset frequency band, the wire will experience the applied large current interference. Then, the first verification result of the verification device when it operates stably after being subjected to this large current interference is detected, so that the subsequent verification of the test system can be further checked based on the first verification result to verify whether the test system has passed the verification, so as to verify the stability and measurement accuracy of the test system.

[0047] Step 130: If the first verification result meets the first preset verification conditions, determine the target verification parameters and target verification frequency band based on the first verification result.

[0048] In some embodiments, the verification device of the test system further includes a first verification module and a second verification module, the first verification module being electrically connected to the second verification module via a wire; the test system further includes a directional coupler electrically connected to a current injection probe; the first preset frequency band includes multiple frequency test points; the first verification result includes the monitoring voltage of the first verification module corresponding to the first preset frequency band, and the first forward power of the directional coupler corresponding to the first preset frequency band; the first preset verification condition includes: the monitoring voltage corresponding to a frequency test point in the first preset frequency band exceeds a preset voltage range.

[0049] The preset voltage range is 2.54V ± 100mV, i.e., 2.44V-2.64V.

[0050] The monitoring voltage of the first verification module in the first preset frequency band includes the monitoring voltage corresponding to each frequency test point in the first preset frequency band. The monitoring voltage of the first verification module in the first preset frequency band can be obtained by detecting using a voltage sensor, benchtop multimeter, etc., and the specific settings can be configured according to actual conditions; no specific limitations are made here.

[0051] The first forward power of the directional coupler in the first preset frequency band includes the first forward power corresponding to each frequency test point in the first preset frequency band. The first forward power of the directional coupler in the first preset frequency band can be calculated using a power meter.

[0052] In some embodiments, determining the target verification parameter and the target verification frequency band based on the first verification result includes: if the monitoring voltage corresponding to a frequency test point in the first preset frequency band exceeds a preset voltage range, selecting the first forward power corresponding to the target verification frequency band as the target verification parameter; wherein, the target verification frequency band includes all frequency test points whose monitoring voltage exceeds the preset voltage range.

[0053] Specifically, the first verification module, wires, and second verification module of the verification device are connected and powered on. When the current injection probe applies a preset current (i.e., injects a large current) to the wire in the first preset frequency band, the wire will experience the applied large current interference. Then, the first verification result of the verification device when it operates stably after being subjected to this large current interference is detected. The first verification result includes the monitoring voltage corresponding to each frequency test point of the first verification module in the first preset frequency band, and the first forward power corresponding to each frequency test point of the directional coupler in the first preset frequency band. When the monitoring voltage corresponding to a frequency test point in the first preset frequency band exceeds the preset voltage range, it indicates that the first verification result fails. In this case, the first forward power corresponding to the frequency test point whose monitoring voltage exceeds the preset voltage range is selected as the target verification parameter (i.e., target forward power), and the frequency test point whose monitoring voltage exceeds the preset voltage range is designated as the target verification frequency band. This allows for further verification of whether the test system passes the verification based on the target verification frequency band and target verification parameter, thereby verifying the stability and measurement accuracy of the test system.

[0054] Step 140: Apply a preset current to the conductor in the target verification frequency band using a current injection probe.

[0055] The phrase "the current injection probe applies a preset current to the conductor in the target verification frequency band" means that the current injection probe applies a preset current at each frequency test point in the target verification frequency band (i.e., at each frequency test point where the monitored voltage exceeds the preset voltage range).

[0056] Step 150: Obtain the second verification result of the verification device in the target verification frequency band.

[0057] The second verification result is the result detected by the current injection probe when the verification device is operating stably after injecting a preset current into the conductor in the target verification frequency band. The second verification result includes the verification results detected by the verification device at each frequency test point in the target verification frequency band.

[0058] Step 160: Determine the verification result of the test system based on the target verification parameters, the second verification result, and the second preset verification conditions.

[0059] The target verification parameter is the target forward power, and the second preset verification condition is that the deviation between the target forward power and the second forward power is less than the preset deviation. The preset deviation can be 3dB, or other values, and can be set according to actual conditions; no specific limitations are made here.

[0060] In some embodiments, the second verification result is the second forward power of the directional coupler in the target verification frequency band; determining the verification result of the test system based on the target verification parameters, the second verification result, and the second preset verification conditions includes: determining the target deviation based on the target verification parameters and the second forward power; determining the verification result of the test system as passed if the target deviation is less than the preset deviation; and determining the verification result of the test system as failed if the target deviation is greater than or equal to the preset deviation.

[0061] The target deviation is the difference between the target verification parameter (target forward power) and the second forward power.

[0062] Specifically, the working principle of the verification method of this testing system is as follows: The first verification module, the wire, and the second verification module of the verification device are connected and powered on. When the current injection probe applies a preset current (i.e., injects a large current) to the wire in the first preset frequency band, the wire will feel the applied large current interference. Then, the first verification result of the verification device when it operates stably after being subjected to this large current interference is detected. The first verification result includes the monitoring voltage corresponding to each frequency test point of the first verification module in the first preset frequency band, and the first forward power corresponding to each frequency test point of the directional coupler in the first preset frequency band. When the monitoring voltage corresponding to a frequency test point in the first preset frequency band exceeds the preset voltage range, it indicates that the first verification result fails. Then, the first forward power corresponding to the frequency test point whose monitoring voltage exceeds the preset voltage range is selected as the target verification parameter (i.e., target forward power), and the frequency test point whose monitoring voltage exceeds the preset voltage range is designated as the target verification frequency band. Then, the preset current is applied to the wire in the target verification frequency band through the current injection probe, and the second verification result of the verification device in the target verification frequency band is obtained. Finally, based on the target verification parameters and the second forward power, the target deviation is determined. When the target deviation is less than the preset deviation, the verification result of the test system is considered passed; when the target deviation is greater than or equal to the preset deviation, the verification result of the test system is considered failed. Thus, by setting up a first verification module, wires, and a second verification module in the verification device, a realistic test environment including power-on and wires is provided. In this realistic test environment, the verification method uses the two verification criteria of monitored voltage and forward power to accurately verify the high-current injection test system, thereby determining whether the high-current injection test system has passed the verification and verifying its stability and accuracy.

[0063] Figure 5 This is a schematic diagram of the overall process of a verification method for a testing system provided in this application embodiment. For example, see [link to relevant documentation]. Figure 5 The overall process of the verification method for this testing system includes: First, a first system verification test is conducted to obtain the monitoring voltage value V1 and the first forward power value P1 across the entire frequency band (0.1MHz–400MHz). Then, it is determined whether the monitoring voltage value V1 across the entire frequency band (0.1MHz–400MHz) is within the monitoring range (i.e., the preset voltage range) to obtain the first verification result. Second, if the first verification result fails, the first forward power value P1 exceeding the frequency band of the monitoring range is selected as the target forward power value. Next, a second system verification test is conducted to obtain the second forward power value P2 exceeding the frequency band of the monitoring range. It is determined whether the deviation between the second forward power value P2 and the first forward power value P1 exceeding the frequency band of the monitoring range is less than 3dB to obtain the second verification result. If the deviation between the second forward power value P2 and the first forward power value P1 exceeding the frequency band of the monitoring range is less than 3dB, the verification result of the testing system is determined to be passed. Therefore, the first verification result is obtained by applying a large current interference to the tested wire harness (e.g., at 15cm, 45cm, and 75cm) using a current injection probe, and then monitoring whether the voltage output by the verification device is within the monitoring range using a benchtop multimeter. Simultaneously, the forward power of the directional coupler is monitored in real time using a power probe and power meter. The difference in forward power between the first and second verification results is used to determine the difference in forward power, thus obtaining the second verification result. Furthermore, the verification results of the test system are judged based on the first verification criterion (i.e., the DC voltage output by the verification device when operating stably is 2.54V, with an acceptable range of ±100mV) and the second verification criterion (i.e., the forward power deviation of the current injection clamp is less than 3dB).

[0064] Figure 6 This is a flowchart illustrating a verification and determination process provided in an embodiment of this application. For example, see [link to relevant documentation]. Figure 6 The verification and judgment process includes: verifying whether the test monitoring voltage value V1 is within the monitoring range to obtain the first verification result; determining whether the first verification result passes; if it passes, the verification result of the test system is determined to be passed; if the first verification result fails, the forward power value P1 exceeding the corresponding frequency band of the monitoring range is selected as the target forward power value; then, determining whether the deviation between the forward power value P2 and the forward power value P1 is less than 3dB; if so, the verification result of the test system is determined to be passed; if not, the verification result of the test system is determined to be failed.

[0065] Figure 7This is a schematic diagram of a verification device for a testing system provided in an embodiment of this application. This application provides a verification device for a testing system, see below. Figure 7 The verification device of the testing system includes a wire; the testing system includes a current injection probe; the current injection probe is connected to the wire; wherein, the current injection probe is used to apply a preset current to the wire; the verification device is used to: obtain a first verification result corresponding to the first preset frequency band after the current injection probe applies a preset current to the wire in the first preset frequency band; and, if the first verification result meets the first preset verification condition, determine a target verification parameter and a target verification frequency band based on the first verification result; and, after the current injection probe applies a preset current to the wire in the target verification frequency band, obtain a second verification result corresponding to the target verification frequency band; and determine the verification result of the testing system based on the target verification parameter, the second verification result, and the second preset verification condition.

[0066] The current injection probe includes a coupling clamp. The wire is connected to the current injection probe by passing through the coupling clamp.

[0067] The technical solution of this application provides a verification device for a testing system. This verification device provides a realistic testing environment including power-on and wires during the verification test. During the verification test, it determines the target verification parameters and target verification frequency band based on a first verification result and a first preset verification condition. Then, it determines the verification result of the testing system based on a second verification result under the target verification frequency band test, the target verification parameters, and the second preset verification condition. Therefore, by taking into account the influence of power-on and wires during the verification test, the verification result is more accurate.

[0068] In some embodiments, the verification device of the test system further includes a first verification module (i.e., BCI verification device 1) and a second verification module (i.e., BCI verification device 2), wherein the first verification module is electrically connected to the second verification module via a wire; the test system further includes a directional coupler electrically connected to the current injection probe; the first preset frequency band includes multiple frequency test points; the first verification result includes the monitoring voltage of the first verification module corresponding to the first preset frequency band, and the first forward power of the directional coupler corresponding to the first preset frequency band; The first preset verification condition includes: the monitoring voltage corresponding to a frequency test point in the first preset frequency band exceeds the preset voltage range.

[0069] In some embodiments, the verification device is further configured to: when there is a frequency test point in the first preset frequency band whose corresponding monitoring voltage exceeds a preset voltage range, select the first forward power corresponding to the target verification frequency band as the target verification parameter; wherein, the target verification frequency band includes all frequency test points whose monitoring voltage exceeds the preset voltage range.

[0070] In some embodiments, the second verification result is the second forward power of the directional coupler in the target verification frequency band; the verification device is further configured to: determine the target deviation based on the target verification parameters and the second forward power; if the target deviation is less than a preset deviation, determine that the verification result of the test system is a pass verification; if the target deviation is greater than or equal to the preset deviation, determine that the verification result of the test system is a fail verification.

[0071] Figure 8 This is a schematic diagram of the circuit structure of a test system verification device provided in an embodiment of this application. In some embodiments, see [reference needed]. Figure 8 The first verification module includes a voltage divider unit and a voltage follower; the voltage divider unit is electrically connected to the voltage follower; the voltage divider unit is used to divide the power supply to the target voltage when the verification device is powered on; the voltage follower is used to stably output the monitoring voltage according to the target voltage.

[0072] See Figure 8 The voltage divider unit includes a first resistor R1 and a second resistor R2.

[0073] The voltage follower consists of an operational amplifier AMP and a variable resistor VR1. The operational amplifier AMP has its first pin (Pin1) connected to +Vcc (e.g., +12.7V), its second pin (Pin2) connected to GND, its third pin (Pin3) connected to the voltage divider point (2.54V), its fourth pin (Pin4) connected to the output (Pin5), forming the voltage follower, and its fifth pin (Pin5) as the output terminal, ultimately outputting a voltage of 2.54V.

[0074] In some embodiments, the circuit of the first verification module further includes a filtering unit and a reverse protection diode D1. The filtering unit is an RC filter circuit, including a third resistor R3, a first capacitor C1, a second capacitor C2, and a third capacitor C3. For example, the circuit parameter table of the test system verification device is shown in Table 3.

[0075] Table 3 Circuit Parameter Table of Test System Verification Device

[0076] Specifically, based on the circuit calculation of the testing system's verification device, the first verification criterion is: Stable output DC voltage: 2.54V, with an acceptable range of ±100mV. The specific calculation is as follows: the first resistor R1 and the second resistor R2 participate in voltage division to obtain the target voltage V3, where V3 is... Figure 8 The voltage at point 3 of the operational amplifier; V3=12.7V×(R1 / (R1+ R2))=2.54V; The operational amplifier AMP (LF411) has excellent voltage temperature drift, resulting in higher input voltage stability. At the same time, it forms a voltage follower structure with the variable resistor VR1, which can ensure low output impedance (gain=1), so that load changes do not affect the 2.54V accuracy, and the monitored voltage V5=V3=2.54V.

[0077] The second verification criterion is that the forward power deviation of the current injection clamp is less than 3dB. Specifically, the signal generator produces an RF signal of 0.1MHz–400MHz. The power amplifier amplifies the low-power signal output by the signal generator to the required test level, and outputs it to the current injection probe through a directional coupler. The cable of the device under test (i.e., the first verification module) passes through the current injection probe. Since the current injection probe is essentially a clamp-on current transformer, the cable of the device under test will sense a large current interference. At the same time, the directional coupler provides a channel for monitoring forward and reverse power, so a power meter and power probe can be used to monitor the forward and feedback power values.

[0078] In summary, the verification device of the testing system provided in this application takes into account the powered sample and the wiring harness, making the verification test environment more consistent with the actual test scenario. When the powered sample and the wiring harness are placed in the current injection probe, the impedance of the internal circuit of the sample and the wiring harness will change at different positions. Since the verification device provided in this application takes into account the powered sample and the wiring harness, it can verify whether the testing system can accurately measure under this actual test scenario.

[0079] In some embodiments, the first verification module is the device under test for verification testing, and the second verification module is the load for verification testing.

[0080] Figure 9 This is a schematic diagram of a verification result provided in an embodiment of this application. For example, when the verification device is operating stably, its output DC voltage is 2.54V. The upper and lower limits are set according to an acceptable range of ±100mV, and the verification result is obtained using the verification method of the test system provided in this embodiment of the application. Figure 9 The verification results are shown. Figure 9 The curve Upperlimit represents the upper limit of the output DC voltage (2.64V), and the curve Lower limit represents the lower limit of the output DC voltage (2.44V). The stable value of the output DC voltage V0 is 2.54V. Figure 9As shown, a step-scan test was performed across the entire frequency band from 0.1MHz to 400MHz, obtaining the output DC voltage monitoring values ​​for all test frequency points (a total of 77 frequency points according to the test steps), recorded as V1. A line graph was plotted with the 77 test frequency points corresponding to the frequency range of 0.1MHz-400MHz on the horizontal axis and V1 on the vertical axis. This demonstrates that setting upper and lower limits can better determine the test verification results. The relevant data table corresponding to the verification results is shown in Table 4.

[0081] Table 4. Relevant data table corresponding to the verification results

[0082] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0083] The verification method and apparatus of the test system provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A verification method for a testing system, characterized in that, The verification is performed by a verification device of a testing system, the verification device of which includes: a wire; the testing system includes a current injection probe; the current injection probe is connected to the wire; the method includes: A preset current is applied to the conductor in a first preset frequency band through the current injection probe; Obtain the first verification result of the verification device in the first preset frequency band; If the first verification result meets the first preset verification conditions, the target verification parameters and target verification frequency band are determined based on the first verification result; The preset current is applied to the conductor in the target verification frequency band by the current injection probe; Obtain the second verification result of the verification device corresponding to the target verification frequency band; The verification result of the test system is determined based on the target verification parameters, the second verification result, and the second preset verification conditions.

2. The method according to claim 1, characterized in that, The verification device of the test system further includes a first verification module and a second verification module, wherein the first verification module is electrically connected to the second verification module via the wire; the test system further includes a directional coupler electrically connected to the current injection probe; the first preset frequency band includes multiple frequency test points; the first verification result includes the monitoring voltage of the first verification module in the first preset frequency band, and the first forward power of the directional coupler in the first preset frequency band; The first preset verification condition includes: the monitoring voltage corresponding to a frequency test point in the first preset frequency band exceeds the preset voltage range.

3. The method according to claim 2, characterized in that, The step of determining the target verification parameters and target verification frequency band based on the first verification result includes: If the monitored voltage of a frequency test point in the first preset frequency band exceeds the preset voltage range, the first forward power corresponding to the target verification frequency band is selected as the target verification parameter; wherein, the target verification frequency band includes all frequency test points where the monitored voltage exceeds the preset voltage range.

4. The method according to claim 2, characterized in that, The second verification result is the second forward power of the directional coupler in the target verification frequency band; The step of determining the verification result of the test system based on the target verification parameters, the second verification result, and the second preset verification conditions includes: The target deviation is determined based on the target verification parameters and the second forward power; If the target deviation is less than the preset deviation, the verification result of the test system is determined to be a pass. If the target deviation is greater than or equal to the preset deviation, the verification result of the test system is determined to be a failure.

5. A verification device for a testing system, characterized in that, include: wire; The testing system includes a current injection probe; the current injection probe is connected to the wire. The current injection probe is used to apply a preset current to the conductor; The verification device is used to: obtain a first verification result corresponding to the first preset frequency band after the current injection probe applies a preset current to the conductor in the first preset frequency band; and determine the target verification parameters and the target verification frequency band based on the first verification result when the first verification result meets the first preset verification conditions. And after the current injection probe applies the preset current to the conductor in the target verification frequency band, the verification device obtains the second verification result corresponding to the target verification frequency band. And based on the target verification parameters, the second verification result, and the second preset verification conditions, the verification result of the test system is determined.

6. The apparatus according to claim 5, characterized in that, The verification device of the test system further includes a first verification module and a second verification module, wherein the first verification module is electrically connected to the second verification module via the wire; the test system further includes a directional coupler electrically connected to the current injection probe; the first preset frequency band includes multiple frequency test points; the first verification result includes the monitoring voltage of the first verification module in the first preset frequency band, and the first forward power of the directional coupler in the first preset frequency band; The first preset verification condition includes: the monitoring voltage corresponding to a frequency test point in the first preset frequency band exceeds the preset voltage range.

7. The apparatus according to claim 6, characterized in that, The verification device is also used for: If the monitored voltage of a frequency test point in the first preset frequency band exceeds the preset voltage range, the first forward power corresponding to the target verification frequency band is selected as the target verification parameter; wherein, the target verification frequency band includes all frequency test points where the monitored voltage exceeds the preset voltage range.

8. The apparatus according to claim 6, characterized in that, The second verification result is the second forward power of the directional coupler in the target verification frequency band; The verification device is further configured to: determine the target deviation based on the target verification parameters and the second forward power; If the target deviation is less than the preset deviation, the verification result of the test system is determined to be a pass. If the target deviation is greater than or equal to the preset deviation, the verification result of the test system is determined to be a failure.

9. The apparatus according to claim 6, characterized in that, The first verification module includes: a voltage divider unit and a voltage follower; the voltage divider unit is electrically connected to the voltage follower; the voltage divider unit is used to divide the power supply to output the target voltage when the verification device is powered on; The voltage follower is used to stably output the monitoring voltage according to the target voltage.

10. The apparatus according to claim 6, characterized in that, The first verification module is the device under test for verification testing, and the second verification module is the load for verification testing.

Images