Broadband multichannel self-adaptive non-reflection environment conducted emission test system and broadband multichannel self-adaptive non-reflection environment conducted emission test method

Abstract

The invention relates to a broadband multi-channel self-adaptive non-reflection environment conducted emission test system and a method thereof, and belongs to the technical field of electromagnetic compatibility test. The system comprises a central control unit, an EMI receiver, a multi-channel switching matrix and a plurality of measuring channels. And the central control unit automatically controls the switching matrix to gate the corresponding measurement channel and configure receiver parameters according to the selected test standard and the type of the port to be tested, so that the full-automatic test of the conducted emission of the power line, the signal line and the direct current port is realized. According to the invention, the problems of tedious manual operation, low efficiency and error proneness in traditional testing are solved, the testing accuracy, efficiency and automation degree are remarkably improved, and the method is suitable for electromagnetic compatibility authentication testing of various electronic devices.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic compatibility (EMC) testing technology, specifically relating to a conducted emission testing system and method for measuring the disturbance voltage or disturbance current of electronic and electrical equipment, and in particular a wideband multi-channel automated testing system and method that can adapt to different testing standards and port types of the device under test. Background Technology

[0002] Electromagnetic compatibility (EMC) refers to the ability of a device or system to function properly in its electromagnetic environment without causing unacceptable electromagnetic interference to anything in that environment. Conducted emission testing is a key component of EMC testing, designed to measure the magnitude of electromagnetic interference conducted from electronic and electrical products through power lines, signal lines, or control lines. Almost all products connected to power lines, including many DC-powered products, require conducted emission testing to ensure that the level of interference they generate is within the limits specified in relevant standards.

[0003] Existing conducted emission testing typically requires a complex set of instruments, including an electromagnetic interference (EMI) receiver, an impedance stabilization network (LISN, or Artificial Power Network), an impedance stabilization network (ISN), and various voltage and current probes. Different test accessories and connection methods are needed for different types of ports under test. For example, power ports are typically tested using an LISN; communication ports require selecting the appropriate ISN based on the cable type; and for some high-current devices or specific load ports, direct measurement with voltage probes may be necessary.

[0004] Currently, the level of automation in the testing process is generally low. Test engineers need to manually select appropriate test accessories and perform tedious physical wiring based on the specific characteristics of the device under test (EUT) and the test standards to be followed, such as CISPR 32, CISPR 14-1, or CISPR 11. The provided system diagram includes a switch that requires "manual switching," which is a typical example of manual operation in existing technology. This method not only consumes a significant amount of time and reduces testing efficiency, but is also highly susceptible to human error, such as selecting the wrong accessory or improper connection, leading to deviations in test results and affecting the accuracy and repeatability of the results. This is especially true for complex electronic devices with multiple port types, where pre-test preparation and switching between different ports become extremely cumbersome.

[0005] Therefore, how to automate, integrate, and intelligentize the conducted emission testing process to improve testing efficiency and ensure testing accuracy has become a pressing technical problem in this field. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a wideband multi-channel adaptive non-reflective environment conducted emission test system and method.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A wideband multi-channel adaptive reflection-free environment conducted emission test system includes: The central control unit is configured to store multiple test standards and control the test process; An electromagnetic interference (EMI) receiver, electrically connected to the central control unit, is configured to measure conducted transmitted signals; A multi-channel switching matrix is ​​electrically connected to the central control unit and the electromagnetic interference (EMI) receiver, respectively. Multiple measurement channels are connected to the input of the multi-channel switching matrix, and the multiple measurement channels include: At least one power line measurement channel, including a line impedance stabilization network (LISN) for coupling with the power port of the device under test (EUT); At least one signal line measurement channel, including an impedance stabilization network (ISN) for coupling with the signal port of the device under test (EUT); At least one DC probe measurement channel, including at least one of a voltage probe or a current probe for direct connection to the conductor of the device under test (EUT); The central control unit is configured to control the multi-channel switching matrix to automatically select one of the multiple measurement channels based on the selected test standard and the type of the port under test on the device under test (EUT) to electrically connect it to the electromagnetic interference (EMI) receiver.

[0008] Furthermore, the system also includes a horizontal ground reference plane and a vertical ground reference plane. The device under test (EUT) is placed on an insulated benchtop device above the horizontal ground reference plane. The line impedance stabilization network (LISN) and the impedance stabilization network (ISN) are both referenced to the ground reference plane.

[0009] Furthermore, the at least one power line measurement channel includes a single-phase line impedance stabilization network (LISN) and a three-phase line impedance stabilization network (LISN) to suit different power supply types of the device under test (EUT).

[0010] Furthermore, the at least one signal line measurement channel includes multiple impedance stabilization networks (ISNs) corresponding to CAT3, CAT5, S1, and S8 type communication cables, respectively.

[0011] Furthermore, the central control unit is also configured to automatically set the measurement parameters of the electromagnetic interference (EMI) receiver according to the selected test standard, the measurement parameters including frequency scanning range, detector type, and measurement bandwidth.

[0012] Furthermore, the central control unit is also configured to receive measurement data from the electromagnetic interference (EMI) receiver and compare the measurement data with the limits specified in the selected test standard to generate a test judgment result.

[0013] A broadband multi-channel adaptive conducted emission testing method in a reflection-free environment includes the following steps: A test system is provided, the test system including a central control unit, an electromagnetic interference (EMI) receiver, a multi-channel switching matrix, and multiple measurement channels connected to the multi-channel switching matrix, the multiple measurement channels including a power line measurement channel with a line impedance stabilization network (LISN), a signal line measurement channel with an impedance stabilization network (ISN), and a DC probe measurement channel; Determine the type of a port under test on the Equipment Under Test (EUT) and select the corresponding test standard; The central control unit controls the multi-channel switching matrix to automatically select the measurement channel corresponding to the determined port type in order to establish a measurement path to the electromagnetic interference (EMI) receiver. The central control unit configures the measurement parameters of the electromagnetic interference (EMI) receiver according to the selected test standard; Conducted emission measurements are performed on the device under test (EUT) using the established measurement path. The measurement data acquired from the electromagnetic interference (EMI) receiver is processed to generate test results.

[0014] Furthermore, the step of automatically selecting the measurement channel includes: If the determined port type is a power port, then select the power line measurement channel with the line impedance stabilization network LISN. If the determined port type is a signal port, then select the signal line measurement channel with the impedance stabilization network (ISN). If the determined port type is a load terminal or a high-current power supply terminal that is not suitable for use with a line impedance stabilization network (LISN), then the DC probe measurement channel is selected.

[0015] Furthermore, the step of configuring the measurement parameters includes setting a frequency scan range, which is in the range of 9 kHz to 30 MHz.

[0016] Furthermore, the step of configuring measurement parameters also includes setting the detector type of the electromagnetic interference (EMI) receiver, wherein the detector type includes a quasi-peak detector and an average value detector.

[0017] Furthermore, the step of processing the measurement data includes: comparing the measured conducted emission value with the preset quasi-peak limit and average limit in the selected test standard to determine whether the test passes or fails.

[0018] The beneficial effects of this invention are as follows: (1) The invention achieves automatic selection of test paths and automatic configuration of test parameters by combining a central control unit and a multi-channel switching matrix, which greatly reduces manual intervention, shortens test preparation and execution time, and significantly improves overall test efficiency.

[0019] (2) The automated process minimizes the errors that may be introduced by manual selection of accessories, manual wiring and parameter setting, ensuring the stability and consistency of test conditions, thereby improving the accuracy and repeatability of test results.

[0020] (3) This system integrates multiple testing functions for power lines, signal lines and special ports, and can adapt to various international and domestic standards and different types of devices under test. It has strong flexibility and wide applicability.

[0021] (4) Testers only need to make simple selections and start operations on the software interface of the central control unit to complete complex conducted emission tests, which greatly reduces the skill requirements of operators and simplifies the test process.

[0022] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0023] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 A structural diagram illustrating a typical setup for conducted emission testing; Figure 2 This is a schematic diagram of the hardware architecture of a broadband multi-channel adaptive conducted emission test system according to a preferred embodiment of the present invention.

[0024] Figure reference numerals: Insulation test bench 52, Electromagnetic interference (EMI) receiver 77, Multi-channel switching matrix 80, Central control unit 82, Impedance stabilization network ISN 83, Vertical ground reference plane 87, Single-phase line impedance stabilization network LISN 93, Three-phase line impedance stabilization network LISN 94, Voltage probe 97, Current probe 98, Horizontal ground reference plane 100. Detailed Implementation

[0025] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0027] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0028] This invention provides a wideband multi-channel adaptive non-reflective environment conducted emission testing system. The system includes: a central control unit configured to store multiple test standards and control the test process; an electromagnetic interference (EMI) receiver electrically connected to the central control unit and configured to measure conducted emission signals; a multi-channel switching matrix electrically connected to both the central control unit and the EMI receiver; and multiple measurement channels connected to the input of the multi-channel switching matrix. The multiple measurement channels include: at least one power line measurement channel, including a line impedance stabilization network (LISN) for coupling with the power port of the device under test (EUT); at least one signal line measurement channel, including an impedance stabilization network (ISN) for coupling with the signal port of the EUT; and at least one DC probe measurement channel, including at least one voltage probe or current probe. The core feature is that the central control unit is configured to automatically control the multi-channel switching matrix to select the appropriate measurement channel to connect to the EMI receiver based on the selected test standard and the type of the port under test on the EUT.

[0029] Similarly, to achieve the above objectives, the present invention also provides a supporting testing method. This method includes: providing the aforementioned testing system; determining the type of a port under test on the device under test (EUT) and selecting the corresponding test standard; automatically controlling a multi-channel switching matrix by a central control unit to select a measurement channel corresponding to the port type and establish a measurement path to the electromagnetic interference (EMI) receiver; configuring the receiver's measurement parameters according to the selected standard by the central control unit; performing conducted emission measurements through the established path; and finally processing the measurement data to generate test results.

[0030] Reference Figure 2 This invention provides a wideband multi-channel adaptive non-reflective conducted emission test system. The system is constructed within an electromagnetically shielded environment comprising a horizontal ground reference plane 100 and a vertical ground reference plane 87, providing a foundation for accurate electromagnetic compatibility testing.

[0031] The core components of this system include: A central control unit 82, typically a personal computer (PC) with dedicated control software installed, serves as the command center for the entire system. It stores various conducted emission test standards, such as CISPR 32, CISPR 14-1, and GB9254, and provides a human-machine interface for the automated control of the test process.

[0032] An electromagnetic interference (EMI) receiver 77, such as the Rohde & Schwarz R&S ESR3 model, is a high-precision measuring device used to scan and measure the level of conducted interference signals from the device under test within a specified frequency range, such as 9 kHz to 30 MHz. The receiver connects to a central control unit 82 via a communication interface, receiving its commands and transmitting measurement data back.

[0033] A multi-channel switching matrix 80, embodied in this embodiment as a system interface SI-300-RE, is an RF signal switching device with multiple input ports and one output port. Its input ports are connected to the various measurement channels described below, while its output port is connected to the RF input of the EMI receiver 77. The central control unit 82 controls this matrix to achieve path switching between different measurement channels and the receiver.

[0034] Multiple measurement channels with different functions serve as the front end for sensing and coupling conducted disturbance signals.

[0035] Power line measurement channel: This channel includes at least one line impedance stabilization network (LISN). Figure 2 Two LISNs are shown: LISN 93, NNLK8121-RC, for single-phase equipment; and LISN 94, NSLK8122-RC 94, for three-phase equipment. The function of the LISN is to provide a stable operating power supply to the device under test (EUT) while coupling the common-mode and differential-mode interference voltages generated on the EUT's power line to the measurement receiver.

[0036] Signal line measurement channel: This channel includes multiple impedance stabilization networks ISN 83. Figure 2 The diagram schematically illustrates various ISN 83 types, such as one for connecting CAT3 type cables, two for connecting S1 and S8 type cables respectively, one for connecting CAT5 type cables, and two NTFM8158 models. Each ISN is designed for a specific type of signal cable to provide a standard 150-ohm common-mode termination impedance over the test frequency range and to extract common-mode interference signals.

[0037] DC Probe Measurement Channel: This channel includes probes for direct measurement, such as the voltage probe 97 TK 9420+VT942 and the current probe 98 9123-IN. These probes can be used for contact measurements when the rated current of the device under test exceeds the LISN's carrying capacity, or when it is necessary to directly measure the disturbance voltage on a specific terminal.

[0038] Reference Figure 1During testing, the device under test (EUT) is typically placed on an insulated test bench 52, which is 0.8 meters high, with a horizontal ground reference plane 100 below it. The distance between the EUT and the vertical ground reference plane 87, as well as the cable arrangement, must comply with the requirements of the relevant testing standards.

[0039] Example 1: Automated continuous testing of power and communication ports of information technology equipment This embodiment aims to illustrate the automated testing process of the present invention when testing a complex device that has both a power port and a network communication port, such as a router.

[0040] The workflow is as follows: Test Preparation: The test engineer placed the router EUT on an insulated test bench in a shielded room. The router's power adapter was connected to the EUT port of the Single-Phase Line Impedance Stabilized Network (LISN 93). Simultaneously, a CAT5 Ethernet cable was used, connecting one end to the router's LAN port and the other end to the CAT5 ISN. The RF output ports of both the LISN 93 and the CAT5 ISN were pre-connected to two different input ports of the multi-channel switching matrix SI-300-RE 80.

[0041] Initiating the test procedure: On the software interface of the central control unit 82, the engineer selects CISPR32 Class B as the test standard. The software interface will display a list of ports connected to the EUT. The engineer selects "AC power port" and "CAT5 communication port" to perform continuous testing.

[0042] Automatic power port test: After the engineer clicks "Start Test", the central control unit 82 first performs a test on the power port.

[0043] Path selection: The central control unit 82 recognizes that the current test task is "AC power port" and immediately sends a command to the multi-channel switching matrix 80, causing it to automatically switch to the channel connected to the single-phase line impedance stabilization network LISN 93. At this point, a complete measurement path from LISN to EMI receiver 77 is established.

[0044] Parameter configuration: The central control unit 82 automatically configures the parameters for the EMI receiver 77 according to the built-in CISPR 32 standard database: the scanning frequency range is set to 150kHz to 30MHz, the detector is set to two modes: quasi-peak QP and average AV, and the intermediate frequency bandwidth specified by the standard is set.

[0045] Measurement Execution: After configuration, the central control unit 82 commands the EMI receiver 77 to begin scanning. The receiver sequentially measures the interference voltage of the power supply line (L line) and the neutral line (N line) to ground, and transmits the data back to the central control unit 82 in real time.

[0046] Result Determination: The software interface will display the interference level spectrum in real time, along with the CISPR 32 Class B QP and AV limit lines. After the scan is complete, the system will automatically compare the measured peak value with the limit lines and provide a preliminary judgment of "pass" or "fail".

[0047] Automatic communication port testing: After the power port test is completed, the system seamlessly connects and automatically starts testing the communication ports.

[0048] Path switching: The central control unit 82 identifies the next test task as "CAT5 communication port" and sends a command to the multi-channel switching matrix 80 again, causing it to automatically switch to the channel connected to CAT5 ISN 91. The entire switching process is completed within milliseconds without any manual intervention.

[0049] Parameter configuration and measurement: The central control unit 82 loads the test parameters of the communication port according to the standard requirements and commands the EMI receiver 77 to scan under the new path to measure the common mode interference current.

[0050] Result Processing and Judgment: The measured disturbance current data dBuA is transmitted back to the central control unit 82. The system converts it to disturbance voltage dBuV using a 150-ohm conversion relationship for display and judgment. Finally, the result is compared with the limit of the communication port in the CISPR32 standard.

[0051] Report generation: After all selected test tasks are completed, the central control unit 82 will automatically summarize the test data, graphs and judgment results of all ports and generate a complete test report.

[0052] Example 2: Adaptability testing of power ports for high-current industrial equipment This embodiment aims to illustrate how the present invention can adapt to and complete testing of special devices under test, such as a three-phase industrial motor with a rated current of 100A. The current of this motor exceeds the carrying capacity of a conventional LISN.

[0053] The workflow is as follows: Test Preparation: The engineer properly placed the industrial motor EUT on the floor of the shielded room and ensured proper insulation. Since a suitable LISN was unavailable, the motor's three-phase power supply was directly connected to the power supply system. The RF output of the voltage probe 97 TK 9420 was connected to one input port of the multichannel switching matrix 80.

[0054] Initiating the test procedure: On the software interface of the central control unit 82, the engineer selects the test standard as CISPR11 Group 1 Class A. In the port type selection, the engineer specifies "three-phase power port" and specifically notes the test method as "voltage probe method".

[0055] Adaptability testing process: Path selection: Based on the engineer's input, the central control unit 82 identifies the channel that needs to be measured using a DC probe. The system then sends a command to the multi-channel switching matrix 80 to connect the channel to the voltage probe 97.

[0056] Manual assistance: At this time, the software interface will pop up a prompt to guide the engineer to safely connect the probe end of a voltage probe 97 to one of the power phase lines of the motor, and connect the ground end of the probe to the nearest horizontal ground reference plane 100.

[0057] Parameter Configuration and Measurement: After confirming the connection is correct, the engineer clicks "Continue" on the software. The central control unit 82 configures the EMI receiver 77 according to the CISPR 11 standard, sets the frequency range to 150kHz to 30MHz, and starts scanning.

[0058] Cyclic Measurement and Data Processing: After one scan is completed, the software will prompt the engineer to switch the probe to the other two phase lines in sequence and repeat the measurement process. After all phase lines have been measured, the system will integrate the data from the three measurements and take the maximum value as the final result.

[0059] Result determination: The system compares the final disturbance voltage measurement result with the limit of CISPR 11 Group 1 Class A and generates a test report.

[0060] As can be seen from the above embodiments, the system and method proposed in this invention, by connecting various test front-ends and EMI receivers through a programmable multi-channel switching matrix and uniformly scheduling them by an intelligent central control unit, successfully integrates multiple originally independent, cumbersome, and manual test steps into an automated, intelligent, and unified test process. This not only greatly improves the efficiency and reliability of conducted emission testing but also provides strong technical support for meeting the increasingly complex electromagnetic compatibility testing needs of electronic products.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A wideband multi-channel adaptive non-reflective environment conducted emission test system, characterized in that: include: The central control unit is configured to store multiple test standards and control the test process; An electromagnetic interference (EMI) receiver, electrically connected to the central control unit, is configured to measure conducted transmitted signals; A multi-channel switching matrix is ​​electrically connected to the central control unit and the electromagnetic interference (EMI) receiver, respectively. Multiple measurement channels are connected to the input of the multi-channel switching matrix, and the multiple measurement channels include: At least one power line measurement channel, including a line impedance stabilization network (LISN) for coupling to the power port of the device under test (EUT); At least one signal line measurement channel, including an impedance stabilization network (ISN) for coupling with the signal port of the device under test (EUT); At least one DC probe measurement channel, including at least one of a voltage probe or a current probe for direct connection to the conductor of the device under test (EUT); The central control unit is configured to control the multi-channel switching matrix to automatically select one of the multiple measurement channels based on the selected test standard and the type of the port under test on the device under test (EUT) to electrically connect it to the electromagnetic interference (EMI) receiver.

2. The wideband multi-channel adaptive reflection-free environment conducted emission test system according to claim 1, characterized in that: The system also includes a horizontal ground reference plane and a vertical ground reference plane. The device under test (EUT) is placed on an insulated benchtop device above the horizontal ground reference plane. The line impedance stabilization network (LISN) and the impedance stabilization network (ISN) are both referenced to the ground reference plane.

3. The wideband multi-channel adaptive reflection-free environment conducted emission test system according to claim 1, characterized in that: The at least one power line measurement channel includes a single-phase line impedance stabilization network (LISN) and a three-phase line impedance stabilization network (LISN) to suit different power supply types of the device under test (EUT).

4. The wideband multi-channel adaptive reflection-free environment conducted emission test system according to claim 1, characterized in that: The at least one signal line measurement channel includes multiple impedance stabilization networks (ISNs) corresponding to CAT3, CAT5, S1, and S8 type communication cables, respectively.

5. The wideband multi-channel adaptive reflection-free environment conducted emission test system according to claim 1, characterized in that: The central control unit is also configured to automatically set the measurement parameters of the electromagnetic interference (EMI) receiver according to the selected test standard. The measurement parameters include the frequency scanning range, detector type, and measurement bandwidth.

6. The wideband multi-channel adaptive reflection-free environment conducted emission test system according to claim 5, characterized in that: The central control unit is also configured to receive measurement data from the electromagnetic interference (EMI) receiver and compare the measurement data with the limits specified in the selected test standard to generate a test judgment result.

7. A broadband multi-channel adaptive conducted emission testing method in a reflection-free environment, characterized in that: Includes the following steps: A test system is provided, the test system including a central control unit, an electromagnetic interference (EMI) receiver, a multi-channel switching matrix, and multiple measurement channels connected to the multi-channel switching matrix, the multiple measurement channels including a power line measurement channel with a line impedance stabilization network (LISN), a signal line measurement channel with an impedance stabilization network (ISN), and a DC probe measurement channel. Determine the type of a port under test on the device under test (EUT) and select the corresponding test standard; The central control unit controls the multi-channel switching matrix to automatically select the measurement channel corresponding to the determined port type in order to establish a measurement path to the electromagnetic interference (EMI) receiver. The central control unit configures the measurement parameters of the electromagnetic interference (EMI) receiver according to the selected test standard; Conducted emission measurements are performed on the device under test (EUT) using the established measurement path. The measurement data acquired from the electromagnetic interference (EMI) receiver is processed to generate test results.

8. The broadband multi-channel adaptive reflection-free environment conducted emission test method according to claim 7, characterized in that: The step of automatically selecting the measurement channel includes: If the determined port type is a power port, then select the power line measurement channel with the line impedance stabilization network LISN. If the determined port type is a signal port, then select the signal line measurement channel with the impedance stabilization network (ISN). If the determined port type is a load terminal or a high-current power supply terminal that is not suitable for use with a line impedance stabilization network (LISN), then the DC probe measurement channel is selected.

9. The broadband multi-channel adaptive reflection-free environment conducted emission test method according to claim 7, characterized in that: The step of configuring the measurement parameters includes setting a frequency scan range, which is in the range of 9 kHz to 30 MHz.

10. The broadband multi-channel adaptive reflection-free environment conducted emission test method according to claim 7, characterized in that: The step of configuring measurement parameters also includes setting the detector type of the electromagnetic interference (EMI) receiver, wherein the detector type includes a quasi-peak detector and an average value detector.

11. The broadband multi-channel adaptive reflection-free environment conducted emission testing method according to claim 7, characterized in that: The steps for processing the measurement data include: comparing the measured conducted emission value with the preset quasi-peak limit and average limit in the selected test standard to determine whether the test passes or fails.

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