LIN signal filter for EMC testing device and EMC testing device

Abstract

The utility model discloses an LIN signal filter for an EMC testing device, which relates to the field of EMC testing and comprises a filter circuit, an LIN signal receiving end, an LIN signal output end and a direct-current power line port. Wherein the filter circuit accesses an LIN signal through an LIN signal receiving end, and is connected with an artificial network LISN in the EMC test device through a direct current power line port; the artificial network LISN is used for simulating vehicle wire harness impedance; the filter circuit is used for processing an LIN signal accessed by the LIN signal receiving end and inputting the processed signal into a tested sample piece in the EMC testing device through the LIN signal output end; by introducing the filter circuit, the LIN signal is effectively pulled up and high-frequency noise is filtered out, so that the low-frequency LIN signal is kept pure in the transmission process, and the error rate and other communication problems caused by external electromagnetic interference or internal noise in the EMC test process are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of EMC test, especially a LIN signal filter for EMC test device and EMC test device. BACKGROUND

[0002] LIN signal plays a crucial role in automotive electronic systems, providing a low-cost, efficient low-speed serial communication method that ensures communication reliability and stability. The design of LIN protocol enables distributed control in vehicles without complex network structures, and its characteristics of easy integration and maintenance are widely used in various non-critical control systems with relatively low real-time and bandwidth requirements, such as window control, seat adjustment, light control, and air conditioning systems. With the development of automotive technology, LIN protocol will continue to provide basic support for emerging technologies such as intelligent vehicles and autonomous driving. Therefore, the present application has developed a LIN signal filter for EMC test device that can improve signal level stability and suppress noise. The circuit avoids errors or other faults caused by LIN signal quality problems (such as noise or distortion) when the DUT device receives or processes LIN signals, thereby ensuring that test results accurately reflect the true anti-interference ability of the DUT. SUMMARY

[0003] To improve the accuracy of EMC testing, the utility model provides a LIN signal filter for EMC test device, which comprises:

[0004] Filter circuit, LIN signal receiving end, LIN signal output end and DC power line port; wherein:

[0005] The filter circuit connects the LIN signal through the LIN signal receiving end, and connects with the artificial network LISN in the EMC test device through the DC power line port; the artificial network LISN is used for simulating vehicle wiring impedance;

[0006] The filter circuit is used for processing the LIN signal connected by the LIN signal receiving end, and inputting the processed signal into the measured sample in the EMC test device through the LIN signal output end.

[0007] Further, the artificial network LISN includes an anode artificial network LISN and a cathode artificial network LISN.

[0008] Further, the DC power line port includes: positive terminal and negative terminal;

[0009] The positive terminal connects the anode artificial network LISN, and the negative terminal connects the cathode artificial network LISN.

[0010] Further, the filter circuit comprises a first resistor R1 and a first capacitor C1.

[0011] The first resistor R1 is used to pull up the LIN signal.

[0012] The first capacitor C1 is used to filter the high-frequency noise of the LIN signal.

[0013] Further, one end of the first resistor R1 is connected with one end of the first capacitor C1, and the other end is connected with the anode artificial network LISN through the positive terminal of the DC power line port; the other end of the first capacitor C1 is connected with the cathode artificial network LISN through the negative terminal of the DC power line port; and the connection end of the first resistor R1 and the first capacitor C1 is connected with the LIN signal receiving end and the LIN signal output end.

[0014] The LIN signal received by the LIN signal receiving end is processed by the first resistor R1 and the first capacitor C1, and then input into the measured sample through the LIN signal output end.

[0015] The utility model also provides an EMC testing device, which comprises:

[0016] The host computer is used to send the LIN signal.

[0017] The reference plane further comprises a battery, an artificial network LISN, a LIN signal filter and a measured sample connected to the reference plane.

[0018] The battery is used to provide electric energy for the artificial network LISN.

[0019] The artificial network LISN is connected with the LIN signal filter and is used to simulate the impedance of the vehicle wire harness.

[0020] The LIN signal filter is used to receive and process the LIN signal sent by the host computer and input the processed signal into the measured sample.

[0021] Further, the EMC testing device further comprises a signal processor connected with the LIN signal filter and the measured sample connection line and used to amplify the LIN signal.

[0022] Further, the LIN signal filter comprises a filter circuit, a LIN signal receiving end, a LIN signal output end and a DC power line port.

[0023] The filter circuit receives the LIN signal sent by the host computer through the LIN signal receiving end and is connected with the artificial network LISN through the DC power line port.

[0024] The filter circuit is used for processing a LIN signal accessed by the LIN signal receiving end, and inputting the processed signal to a measured sample through the LIN signal output end.

[0025] Further, the artificial network LISN comprises an anode artificial network LISN and a cathode artificial network LISN.

[0026] The DC power line port comprises a positive terminal and a negative terminal; the positive terminal accesses the anode artificial network LISN, and the negative terminal accesses the cathode artificial network LISN.

[0027] The filter circuit comprises a first resistor R1 and a first capacitor C1; the first resistor R1 is used for pulling up the LIN signal; and the first capacitor C1 is used for filtering high-frequency noise of the LIN signal.

[0028] Further, one end of the first resistor R1 is connected with one end of the first capacitor C1, and the other end accesses the anode artificial network LISN through the positive terminal of the DC power line port; the other end of the first capacitor C1 accesses the cathode artificial network LISN through the negative terminal of the DC power line port; and the connection end of the first resistor R1 and the first capacitor C1 is connected with the LIN signal receiving end and the LIN signal output end simultaneously.

[0029] The LIN signal accessed by the LIN signal receiving end is processed by the first resistor R1 and the first capacitor C1, and then input to the measured sample through the LIN signal output end.

[0030] Compared with the prior art, the utility model has at least the following beneficial effects:

[0031] (1) The utility model discloses the filter circuit (including first resistor R1 and first capacitor C1) is introduced, and LIN signal is effectively pulled up and high-frequency noise is filtered out, and this ensures that low-frequency LIN signal keeps pure in the transmission process, and reduces the error rate and other communication problems caused by external electromagnetic interference or internal noise in the EMC test process.

[0032] (2) The filter processing avoids the DUT misoperation or failure caused by the problem (such as noise or distortion) of LIN signal itself, so that the test result can more accurately reflect the real performance of DUT when facing external electromagnetic interference. This helps manufacturers better understand the robustness and reliability of products.

[0033] (3) The LIN signal filter design considers the complex electromagnetic environment in the actual vehicle, and simulates the vehicle wire harness impedance by being connected with the artificial network LISN, and this close-to-real test condition improves the effectiveness and credibility of EMC test.

[0034] (4) The application applies the LIN signal filter in the EMC test device, improves the quality and transmission stability of the LIN signal, enhances the evaluation accuracy of the electromagnetic compatibility of the DUT, and brings significant technical progress for the development and test of the automotive electronic system. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a circuit structure diagram of the LIN signal filter for the EMC test device.

[0036] Figure 2 It is a structural schematic diagram of the EMC test device. DETAILED DESCRIPTION

[0037] The following is a specific embodiment of the application and further describes the technical scheme of the application in combination with the drawings, but the application is not limited to these embodiments.

[0038] Embodiment one

[0039] In order to improve the accuracy of EMC test, as shown in the background art, the application provides a LIN signal filter for an EMC test device, which comprises: Figure 1

[0040] The filter circuit, the LIN signal receiving end, the LIN signal output end and the DC power line port; wherein:

[0041] The filter circuit connects the LIN signal through the LIN signal receiving end, and connects the artificial network LISN in the EMC test device through the DC power line port; the artificial network LISN is used for simulating the impedance of the vehicle wiring harness;

[0042] The artificial network LISN comprises an anode artificial network LISN and a cathode artificial network LISN.

[0043] The DC power line port comprises a positive terminal and a negative terminal.

[0044] The positive terminal connects the anode artificial network LISN, and the negative terminal connects the cathode artificial network LISN.

[0045] The filter circuit is used for processing the LIN signal connected by the LIN signal receiving end, and inputs the processed signal into the measured sample in the EMC test device through the LIN signal output end.

[0046] The filter circuit comprises a first resistor R1 and a first capacitor C1.

[0047] The first resistor R1 is used for pulling up the LIN signal.

[0048] ​The first capacitor C1 is used to filter high-frequency noise of the LIN signal.

[0049] One end of the first resistor R1 is connected with one end of the first capacitor C1, and the other end is connected with the anode artificial network LISN through the positive end of the DC power line port; the other end of the first capacitor C1 is connected with the cathode artificial network LISN through the negative end of the DC power line port; the connection end of the first resistor R1 and the first capacitor C1 is connected with the LIN signal receiving end and the LIN signal output end simultaneously.

[0050] The LIN signal received by the LIN signal receiving end is input into the measured sample through the LIN signal output end after being processed by the first resistor R1 and the first capacitor C1.

[0051] In the utility model, the LIN signal is connected to the anode artificial network LISN through the first resistor R1 (pull-up resistor), and the pull-up resistor helps to suppress noise. If there is no R1, the LIN bus may be easily disturbed by external electromagnetic noise in the idle state, leading to signal false touch and communication error. In addition, the LIN signal is also connected to the cathode artificial network LISN through the first capacitor C1 (filter capacitor). The capacitor C1 stores electric charge in the circuit and provides a discharge path for the signal; the capacitor with small capacitance value presents large impedance to low-frequency LIN signal, so that these signals can smoothly pass through the capacitor, ensuring that the input signal is approximately equal to the output signal, thereby improving the quality of the output LIN signal. This design ensures that the LIN signal remains stable and pure during transmission, reduces communication problems caused by external interference or internal noise, and improves the reliability and performance of EMC testing.

[0052] The utility model introduces the filter circuit (including the first resistor R1 and the first capacitor C1), effectively pulls up the LIN signal and filters out high-frequency noise, which ensures that the low-frequency LIN signal remains pure during transmission, reduces the bit error rate and other communication problems caused by external electromagnetic interference or internal noise during EMC testing.

[0053] Embodiment two

[0054] It should be noted in advance that the main purpose of EMC (Electromagnetic Compatibility) testing is to ensure that electronic devices can function normally in their intended electromagnetic environment, while not causing unacceptable electromagnetic interference to other devices. As for automotive electronic products, the purpose of EMC testing includes: immunity test: verify whether the device can maintain normal function in the presence of external electromagnetic interference. When performing these tests, the goal is to confirm that the product meets the requirements of relevant standards and regulations to ensure its safety and compliance in the market.

[0055] In addition, in the field of automotive electronics, the DUT refers to a single electronic control unit (ECU), a sensor, an actuator, or a more complex integrated system such as a node on a LIN network. In EMC (electromagnetic compatibility) testing, the DUT refers to an electronic device that is to be tested to ensure that it can work normally in the expected electromagnetic environment. For example, in the EMC test of LIN signal transmission, the DUT may be an automotive electronic component containing a LIN communication interface. The purpose of the test is to confirm that these devices not only operate correctly under various electromagnetic conditions, but also do not generate excessive electromagnetic interference that affects the operation of other devices.

[0056] As shown in Figure 2 The embodiment also provides an EMC testing device, which comprises:

[0057] The host computer is used to send a LIN signal.

[0058] The reference ground plane;

[0059] It should be noted that the reference ground plane is the basis of the entire test environment, and the reference ground plane, the LIN signal filter, the battery, the artificial network LISN and the measured sample are all connected to the reference ground plane.

[0060] The battery, the artificial network LISN, the LIN signal filter and the measured sample (DUT) connected to the reference ground plane are further included.

[0061] The battery is used to provide power to the artificial network LISN.

[0062] The artificial network LISN is connected with the LIN signal filter and is used to simulate the impedance of the vehicle wiring harness.

[0063] The LIN signal filter is used to access and process the LIN signal sent by the host computer, and input the processed signal into the measured sample (DUT).

[0064] The LIN signal filter comprises a filter circuit, a LIN signal receiving end, a LIN signal output end and a DC power line port.

[0065] The filter circuit accesses the LIN signal sent by the host computer through the LIN signal receiving end, and is connected with the artificial network LISN through the DC power line port.

[0066] The filter circuit is used to process the LIN signal accessed by the LIN signal receiving end, and input the processed signal into the measured sample (DUT) through the LIN signal output end.

[0067] In the utility model:

[0068] The LIN signal filter is mainly used in cooperation with the artificial network LISN to simulate the real load condition and ensure the quality of the LIN signal.

[0069] The DUT is fixed by 5cm thick foam material to reduce the influence of mechanical vibration.

[0070] It should be noted that the reference ground plane, the LIN signal filter, the battery, the artificial network LISN and the DUT in the EMC test device are all placed in the test chamber to isolate external interference and ensure the accuracy of the test results.

[0071] The purpose of applying the LIN signal filter in the EMC test device in the embodiment is to:

[0072] 1. The LIN bus is a single-ended communication system, which is easily affected by external electromagnetic noise. Through the filter capacitor (C1), high-frequency noise components can be effectively removed, ensuring that low-frequency LIN signals are not disturbed, thereby maintaining the clarity and integrity of the signals.

[0073] 2. Without proper filtering measures, LIN communication may produce unnecessary voltage fluctuations due to external electromagnetic interference, leading to misjudgment or communication errors at the receiving end (DUT). The filter helps suppress these unwanted signal changes and ensures the reliability of data transmission.

[0074] 3. There are various electronic devices inside the car, which may interfere with LIN bus communication by generating electromagnetic radiation. By introducing a filter circuit in the test, the anti-interference ability of LIN communication is enhanced, ensuring normal communication function even in a harsh electromagnetic environment.

[0075] That is, the main purpose of filtering the LIN signal in the present application is to ensure that the DUT receives clean, undisturbed or low-disturbance LIN signals, thereby avoiding the occurrence of bit error rate or other faults in the DUT due to the quality problems (such as noise or distortion) of the LIN signal itself. This helps to ensure that the test results accurately reflect the true anti-interference ability of the DUT, rather than being affected by the accuracy of the test due to signal quality problems.

[0076] The artificial network LISN includes an anode artificial network LISN and a cathode artificial network LISN;

[0077] The DC power line port includes a positive terminal and a negative terminal; the positive terminal is connected to the anode artificial network LISN, and the negative terminal is connected to the cathode artificial network LISN;

[0078] The filter circuit comprises a first resistor R1 and a first capacitor C1; the first resistor R1 is used for pulling up the LIN signal; and the first capacitor C1 is used for filtering high-frequency noise of the LIN signal.

[0079] One end of the first resistor R1 is connected with one end of the first capacitor C1, and the other end is connected with an anode artificial network LISN through a positive electrode end of a direct-current power line port; the other end of the first capacitor C1 is connected with a cathode artificial network LISN through a negative electrode end of the direct-current power line port; and the connection end of the first resistor R1 and the first capacitor C1 is connected with a LIN signal receiving end and a LIN signal output end simultaneously.

[0080] The LIN signal received by the LIN signal receiving end is processed by the first resistor R1 and the first capacitor C1, and then input into a DUT (Device Under Test) through the LIN signal output end.

[0081] The performance of a DUT (Device Under Test) in electromagnetic compatibility (EMC) tests, especially for LIN signal transmission tests, is mainly evaluated based on the following key parameters:

[0082] Bit Error Rate (BER): Measures the proportion of incorrect data in LIN communication when the DUT is subjected to electromagnetic interference. A qualified DUT should maintain a very low bit error rate under specified electromagnetic interference levels.

[0083] Loss of Function or Degradation: Checks whether the DUT can work normally in an electromagnetic interference environment, including its LIN communication function. If the DUT's function is significantly affected, such as communication interruption, increased delay, or command execution failure, it is considered to have insufficient immunity.

[0084] Restart or Reset: Observes whether the DUT will unexpectedly restart or reset due to electromagnetic interference, indicating that the device may be too sensitive to certain types of interference.

[0085] The LIN signal filter of the utility model takes into account the complex electromagnetic environment in actual vehicles and simulates vehicle wiring impedance by connecting with an artificial network LISN, which improves the effectiveness and credibility of EMC tests in a more realistic test condition.

[0086] In EMC testing, the LIN signal filter of the present application ensures accurate and reliable test data by providing a load performance close to actual working conditions. For LIN signal transmission, the filter includes a filtering circuit, which includes a first resistor R1 and a first capacitor C1, for pulling up the LIN signal and effectively filtering out high-frequency noise. This design ensures a certain degree of signal integrity, preventing low-frequency LIN signals from being contaminated by other interference signals, thereby significantly improving the clarity and reliability of information transmission. Specifically, the pull-up resistor R1 helps suppress noise and avoid communication errors caused by external electromagnetic interference on the LIN bus in the idle state; while the filter capacitor C1 stores charge and provides a discharge path to ensure that low-frequency LIN signals can pass smoothly, maintaining their quality and stability. Therefore, this design not only improves the anti-interference ability of LIN signals in complex electromagnetic environments, but also provides more accurate test signals for evaluating the true performance of DUTs.

[0087] The EMC test device further comprises:

[0088] and a signal processor connected to the connection line between the LIN signal filter and the DUT, for amplifying the LIN signal.

[0089] An optical camera (Optical Camera) is used to record the state changes of the DUT during the test process for subsequent analysis.

[0090] The signal processor in this embodiment includes three probes, which are arranged in sequence on the connection line between the LIN signal filter and the DUT, and are respectively located at positions 150 mm, 450 mm and 750 mm away from the LIN signal filter, for measuring the electromagnetic field strength at different positions.

[0091] The use of the EMC test device for the large current injection method (BCI) of electromagnetic radiation immunity will be described in detail as follows:

[0092] 1. Test environment

[0093] Test site: The test is carried out in an electromagnetic shielding room or a semi-anechoic chamber. These environments can effectively isolate external electromagnetic interference, ensuring the accuracy and repeatability of test results.

[0094] 2. Test arrangement

[0095] Distance between DUT and LIN signal filter:

[0096] The distance between the DUT and the LIN signal filter of the present design is 1700 mm (allowable error +300 / -0 mm). This fixed distance is to ensure the consistency of test conditions and meet the requirements of relevant standards.

[0097] 3. Position of load simulator:

[0098] The LIN signal filter of the design is placed on the reference ground plane, and the DC power line port is connected to the artificial network LISN instead of the impedance of the vehicle wiring harness. The LIN signal output end is connected with the automotive electronic device DUT (i.e. the measured device) containing LIN communication, so as to ensure that the low-frequency LIN signal can maintain a certain degree of signal integrity during signal transmission.

[0099] 4. Injection mode

[0100] The test arrangement distinguishes two injection modes: differential bulk current injection (DBCI) and common mode bulk current injection (CBCI), and selects the corresponding injection mode according to different frequency ranges.

[0101] (1) Differential bulk current injection (DBCI)

[0102] Applicable frequency range: 0.1 MHz ~ 30 MHz;

[0103] Probe position: The current injection probe is placed at a distance of 150 mm and 450 mm from the DUT connector for testing;

[0104] Wiring harness position: The DUT power return line is placed outside the bulk current injection probe;

[0105] Other DUT wiring harnesses (including LIN communication lines) are placed inside the injection probe.

[0106] (2) Common mode bulk current injection (CBCI)

[0107] Applicable frequency range: 30 MHz ~ 400 MHz;

[0108] Probe position: The current injection probe is placed at a distance of 450 mm and 750 mm from the DUT connector for testing;

[0109] Wiring harness position: All DUT wiring harnesses (including power lines and LIN communication lines) are placed inside the bulk current injection probe.

[0110] Multiple connector handling:

[0111] If the DUT has multiple independent connectors, the wiring harness of each connector needs to be tested separately according to the above arrangement. This ensures that all possible electromagnetic coupling paths are fully evaluated.

[0112] 5. Test purpose

[0113] With this arrangement, the test aims to verify whether the DUT can function normally under the condition of different intensity and frequency of electromagnetic interference, especially focusing on the integrity and reliability of the LIN signal. Specifically, the test checks the DUT's performance, error rate, signal quality, and overall stability when facing external electromagnetic interference, to ensure that it meets the stringent requirements of automotive electronic systems.

[0114] The present application applies a LIN signal filter in the EMC test device, not only improves the quality and transmission stability of the LIN signal, but also enhances the evaluation accuracy of the electromagnetic compatibility of the DUT, bringing significant technical progress for the development and testing of automotive electronic systems.

[0115] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0116] In addition, in the present application, the description of "first", "second", "one" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0117] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be broadly understood, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be internal communication of two elements or interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0118] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

Claims

1. A LIN signal filter for an EMC test device, characterized in that It includes: Filter circuit, LIN signal receiving end, LIN signal output end and DC power line port; wherein: The filter circuit accesses the LIN signal through the LIN signal receiving end, and connects with the artificial network LISN in the EMC test device through the DC power line port; the artificial network LISN is used for simulating the impedance of vehicle wiring harness; The filter circuit is used for processing the LIN signal accessed by the LIN signal receiving end, and inputting the processed signal to the measured sample in the EMC test device through the LIN signal output end.

2. A LIN signal filter for an EMC test device according to claim 1, characterized in that The artificial network LISN includes an anode artificial network LISN and a cathode artificial network LISN.

3. A LIN signal filter for an EMC test device according to claim 2, characterized in that The DC power line port includes: positive end and negative end; The positive end accesses the anode artificial network LISN, and the negative end accesses the cathode artificial network LISN.

4. A LIN signal filter for an EMC test device according to claim 3, characterized in that The filter circuit includes: first resistor R1 and first capacitor C1; The first resistor R1 is used for pulling up the LIN signal; The first capacitor C1 is used for filtering the high-frequency noise of the LIN signal.

5. A LIN signal filter for an EMC test device according to claim 4, characterized in that One end of the first resistor R1 and one end of the first capacitor C1 are connected, and the other end of the first resistor R1 accesses the anode artificial network LISN through the positive end of the DC power line port; the other end of the first capacitor C1 accesses the cathode artificial network LISN through the negative end of the DC power line port; the connection end of the first resistor R1 and the first capacitor C1 is connected with the LIN signal receiving end and the LIN signal output end at the same time; The LIN signal accessed by the LIN signal receiving end is processed by the first resistor R1 and the first capacitor C1, and then input to the measured sample through the LIN signal output end.

6. An EMC test apparatus characterised in that, It includes: Host computer, used for sending LIN signal; Reference ground plane; further comprising connected on the reference ground plane: battery, artificial network LISN, LIN signal filter and measured sample; The battery is used for providing power for the artificial network LISN; The artificial network LISN is connected with the LIN signal filter, and is used for simulating the impedance of vehicle wiring harness; The LIN signal filter is used for accessing and processing the LIN signal sent by the host computer, and inputting the processed signal to the measured sample.

7. An EMC test apparatus as claimed in claim 6, characterised in that, The EMC test device further includes: signal processor connected with the connection line of the LIN signal filter and the measured sample, used for amplifying the LIN signal.

8. An EMC test apparatus as claimed in claim 6, characterised in that, The LIN signal filter includes: filter circuit, LIN signal receiving end, LIN signal output end and DC power line port; wherein: The filter circuit accesses the LIN signal sent by the host computer through the LIN signal receiving end, and connects with the artificial network LISN through the DC power line port; The filter circuit is used for processing the LIN signal accessed by the LIN signal receiving end, and inputting the processed signal to the measured sample through the LIN signal output end.

9. An EMC test apparatus as claimed in claim 8, characterised in that, The artificial network LISN includes an anode artificial network LISN and a cathode artificial network LISN; The DC power line port includes: positive end and negative end; the positive end accesses the anode artificial network LISN, and the negative end accesses the cathode artificial network LISN; The filter circuit comprises a first resistor R1 and a first capacitor C1; the first resistor R1 is used for pulling up the LIN signal; and the first capacitor C1 is used for filtering high-frequency noise of the LIN signal.

10. The EMC test device according to claim 9, characterized in that, one end of the first resistor R1 is connected with one end of the first capacitor C1, and the other end is connected with the anode artificial network LISN through the positive terminal of the DC power line port; the other end of the first capacitor C1 is connected with the cathode artificial network LISN through the negative terminal of the DC power line port; and the connection end of the first resistor R1 and the first capacitor C1 is connected with the LIN signal receiving end and the LIN signal output end simultaneously; the LIN signal received by the LIN signal receiving end is input into the measured sample through the LIN signal output end after being processed by the first resistor R1 and the first capacitor C1.

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