흡수 클램프

1. 장비에 대한 기본 이해

1.1 제품 개요

1.1.1 주요 매개변수

파라미터	표시	노트
주파수 범위	30MHz ~ 1000MHz	Rated Operating Frequency Band
출력 임피던스	50 Ω	Matched Coaxial System
Allowed Cable Diameter for Testing	≤20 mm	Exceeding the specifications may damage the equipment.
신호 커넥터	유형 N	출력 포트
Absorption Clamp Factor CF	-4dB ~ 4dB	That is, the correction factor K varies with frequency
Decoupling Factor (DF)	≥21 dB	Ensure isolation between the test terminal and the power supply terminal
분리 계수 DR	≥30 dB	Decoupling Capability of Coaxial Cable Shielding
크기	640mm (L) × 109mm (W) × 100mm (H)
중량(평량)	5의 kg

1.1.2 응용 시나리오

The AB-CLP Absorbing Clamp (ACA) is a specialized device used for disturbance power testing in the field of electromagnetic compatibility (EMC) and serves as an alternative measurement device for radiated emissions testing. By coupling and extracting common-mode disturbance power from the cable under test, it indirectly evaluates a device’s radiated emission level. Since it does not require a large anechoic chamber, it can significantly reduce testing costs and shorten testing cycles, making it widely used in product R& D debugging and pre-compliance testing scenarios.

1.2 Scope of Application and Basis for Standards

1.2.1 Equipment and Method Standards

The performance of this system’s equipment and the testing methods fully comply with the following international and national standards:

장비 사양: CISPR 16-1-3, GB/T 6113.103 (Specifications for Equipment for the Measurement of Radio Disturbance and Immunity—Part 3: Equipment for the Measurement of Disturbance Power)

시험 방법 표준: CISPR 16-2-2, GB/T 6113.202 (Methods for Measuring Radio Disturbance and Immunity—Part 2: Measurement of Disturbance Power)

1.2.2 Applicable Products and Test Frequency Bands

The absorption clamp method is primarily used to evaluate electromagnetic interference radiated by equipment through power and signal lines. The mandatory test frequency bands vary depending on the product standard:

The 30 MHz to 300 MHz frequency range (which provides complete coverage when used with the EMI-9KB)
is the mandatory compliance testing range for the vast majority of products. The corresponding product standards include:

CISPR 14-1 / GB 4343.1: Electromagnetic Compatibility—Emission Requirements for Household Appliances, Power Tools, and Similar Equipment; CISPR 15 / GB 17743: Radio Disturbance Characteristics of Electrical Lighting and Similar Equipment.

300 MHz to 1000 MHz (requires use with the EMI-9KC 리시버)
The AB-CLP Absorb ing Clamp has a rated frequency range of 30 MHz to 1000 MHz, while the EMI-9KC receiver has an upper frequency limit of 1000 MHz.
When testing products such as audio/video receivers and multimedia devices (in accordance with standards such as CISPR 13 and CISPR 32), the standards require evaluation of disturbance power across the entire 30 MHz to 1000 MHz frequency band.

1.3 Equipment Configuration Verification

1.3.1 포장 풀기

When unpacking the device, handle it gently to avoid scratching the outer casing with sharp tools. After unpacking, first inspect the exterior of the device to ensure there is no visible deformation or dents and that the buttons are not damaged or loose. If you notice any abnormalities with the device or its accessories, please contact us immediately.

1.3.2 Main Unit and Accessories

그림 1-1를 참조하세요.

번호	주의 사항
①	AB-CLP 흡수 클램프
②	동축 케이블
③	6dB 동축 감쇠기

1.3.3 Downloading Electronic Documents

Links to the digital user manual, warranty card, calibration certificate, and other documents have been sent via email. If you missed the email, please contact us to receive the links again.

2. 안전상의 주의

2.1 전기 안전

The device under test and the receiver must each be connected to the power grid via an appropriate-specification Isolation Transformer. Direct connection to the mains power supply is strictly prohibited to avoid power surges and the risk of electric shock.

A separate and reliable grounding system must be installed; the lower the grounding resistance, the more accurate the test results will be. Sharing a grounding electrode with high-power electrical equipment is strictly prohibited, and the grounding terminals of all equipment must be securely connected to the grounding electrode.

Do not use the equipment if the power connections are loose or the cable sheath is damaged. During thunderstorms, disconnect all equipment from the power source and ground to prevent damage from lightning strikes.

The receiver’s RF input port is a sensitive RF interface; do not connect high-voltage or high-level signals directly to it, as this may damage the internal circuitry.

2.2 운영 안전

Strictly follow the sequence: “When turning on the system, power on the peripherals first, then the main unit; when turning off the system, power off the main unit first, then the peripherals.”

Before powering on or off the device under test, you must first disconnect the coaxial cable connected to the front end of the receiver to prevent switching transients from damaging the receiver’s internal circuitry; under no circumstances should you plug in or unplug the coaxial cable during testing.

When opening and closing the Absorbing Clamp, operate it smoothly to avoid pinching your hands; do not insert cables or hard metal objects with a diameter greater than 20 mm into the jaws to prevent the internal ferrite core from cracking.

During testing, move the absorption clamp by gently pushing and pulling it to avoid violent impacts with the slide rail, thereby preventing displacement of the internal components that could affect test accuracy.

Unless authorized by the manufacturer, do not disassemble the casing of the absorption clamp or the receiver unit; otherwise, your warranty will be void.

2.3 환경안전

The equipment’s operating environment temperature is 5–35°C, with relative humidity ≤80% and no condensation; flammable, explosive, or corrosive materials must not be stored in the test area.

It is recommended that formal testing be conducted in an electromagnetically shielded room; for preliminary testing, select a separate room located far from sources of strong electromagnetic interference—such as variable-frequency drives, arc welders, high-power chargers, and wireless transmitters—to minimize the impact of environmental background noise.

The test area must be at least 0.8 meters away from walls and other large conductive objects to prevent electromagnetic wave reflections from affecting the test results.

3. Introduction to Auxiliary Equipment and System Wiring

3.1 EMI-9KB 리시버

3.1.1 전면 패널

그림 3-1를 참조하세요.

번호	주의 사항
①	전원 스위치
②	RF 입력 포트는 다음과 연결됩니다. AB-CLP via a coaxial attenuator and coaxial cable

3.1.2 후면 패널

그림 3-2를 참조하세요.

번호	주의 사항
①	Power cord jack, connected to an Isolation Transformer
②	퓨즈
③	RS-232 통신 포트: RS-232 통신 케이블을 사용하여 컴퓨터에 연결하십시오. 컴퓨터에 RS-232 포트가 없는 경우 표준 RS-232-USB 어댑터 케이블을 사용하여 컴퓨터에 연결할 수 있습니다. 참고: 표준 규격이 아닌 통신 케이블이나 어댑터를 사용하면 통신 오류가 발생할 수 있으므로 사용하지 마십시오.

 

3.2 Test System Wiring Procedure

Please complete the system wiring in the following order to ensure reliable connections.

배선 방법	주의 사항
① Power Supply Circuit Wiring	Connect Isolation Transformer 1 to the mains power supply; use its output to power the circuit for the device under test. Connect Isolation Transformer 2 to the mains power supply; connect its output to the EMI-9KB receiver and the computer.
② Wiring the Absorber Clamp to the Receiver	Screw the 6 dB coaxial attenuator onto the N-type output port of the AB-CLP Absorbing Clamp; connect one end of the coaxial cable to the 6 dB attenuator and the other end to the RF input port of the EMI-9KB 수신기.
③ 통신 배선	사용 RS232 cable to connect one end to the RS232 port on the back panel of the receiver and the other end to the computer, either directly or via an RS232-to-USB adapter.
④ 접지 연결	Reliably connect the receiver’s ground terminal and the metal reference ground plate used for testing to a separate grounding electrode using a copper grounding wire.

 

4. EMI-9KB Software Installation and Overview

4.1 Software and Driver Installation

4.1.1 시스템 운영 요구사항

Operating System: Windows 7 / Windows 8 / Windows 10 / Windows 11; Windows 10 is recommended;

Hardware Requirements: Pentium or higher processor, ≥2 GB of RAM, ≥1 GB of free hard disk space, and at least one available USB port;

Screen resolution: 1024×768 or higher is recommended.

4.1.2 설치

그림 4-1를 참조하세요.

번호	주의 사항
①	EMI-9KB Receiver PC Software—Double-click to install
②	RS-232-USB 어댑터 드라이버: RS-232-USB 어댑터를 사용하는 경우 이 드라이버를 설치해야 합니다.

4.1.3 통신 포트 설정

When you open the software for the first time, you may see a communication error message, as shown in Figure 4-2.

Click OK to open the software’s initial interface, then click Test > Port Settings, as shown in Figure 4-3.

Simply select the correct communication port number manually, as shown in Figure 4-4.

그림 4-5에서 보는 것처럼 "내 컴퓨터" > "속성" > "장치 관리자"로 이동하여 장치가 사용하는 통신 포트를 확인할 수 있습니다.

The next time you open the software, you will be taken directly to the initial interface. Note: If the communication port changes, you will need to reselect the correct communication port.

4.2 Introduction to Software Interface Features

4.2.1 File Menu

4.2.1.1 Drop-down List

See Figures 4–6.

번호	주의 사항
①	Open the EMC file
②	Save the test results as an emc file. Note: emc files can only be opened using the LISUN EMI-9KB 소프트웨어.
③	Test Report Settings
④	Print a report that includes final test point data
⑤	Print a report that includes data on points of interest
⑥	소프트웨어를 종료합니다

4.2.1.2 Report Options Information

When saving or printing a test report, the following screen appears first, as shown in Figure 4-7.

번호	주의 사항
①	Save/Print Final Inspection Point/Focus Point Data?
②	Fill in the test-related information
③	Fill in the Laboratory Information

 

4.2.2 설정 메뉴

4.2.2.1 Drop-down List

See Figures 4–8.

번호	주의 사항
①	Test Standards: Select, Add, Modify, or Delete Standards
②	Test parameters: No changes are necessary; simply use the default settings.
③	System Calibration: Used by professional engineers when commissioning the equipment; this feature is not required during normal operation of the equipment.
④	Attenuators: Select based on actual conditions

4.2.2.2 테스트 표준 옵션

See Figures 4–9.

번호	주의 사항
①	선택 기준: 이전에 추가된 기준만 선택할 수 있으며, 기준의 매개변수는 수정할 수 없습니다.
②	표준을 추가, 수정 또는 삭제할 수 있습니다. 주의: 신중하게 진행하십시오. 모든 표준 및 한계 곡선은 제공된 표준에 따라 추가됩니다. 당사 소프트웨어에 포함되지 않은 다른 표준 데이터가 있는 경우 관련 표준을 보내주시면 추가해 드리겠습니다.
③	Absorbing Clamps, Voltage Probes, CDN network correction. Note: For use only by LISUN professional engineers when debugging software.

4.2.2.3 Attenuator Options

그림 4-10를 참조하세요.

번호	주의 사항
①	Do not use an attenuator
②	When using an attenuator, please select and enter the correct attenuation parameters in the software.

Note: When connecting the EMI-9KB 부터 AB-CLP, a 6 dB attenuator must also be connected; please set the correct attenuator parameters before use.

4.2.3 테스트 메뉴

그림 4-11를 참조하세요.

번호	주의 사항
①	For communication port settings, see 4.1.3
②	Scan: Perform a scan test according to the criteria and parameter settings selected at that time.
③	Spot Test: If you only want to view data for a specific frequency point, click here to manually enter the frequency and run the test.
④	Final Test: After the scan test is complete, if you want to test the specific data for certain points again, you can perform a final test.
⑤	자동 최종 테스트: 소프트웨어는 테스트 결과를 바탕으로 최종 테스트를 위한 대표적인 주파수 지점을 자동으로 선택합니다.
⑥	Manual Final Test: Users manually add the frequency points to be tested based on their own needs.

4.2.4 디스플레이 메뉴

그림 4-12를 참조하세요.

번호	주의 사항
①	The graph shows both the default PK and AV lines.
②	Add a monitoring point; this feature works the same as in the final test in version 4.2.3, and you can manually set the frequency points.
③	Display data that falls outside the limit curve
④	Display the data for the final test point
⑤	After performing two consecutive scan tests, you can click to compare the results of the two tests.

4.2.5 Introduction to Navigation Bar Shortcut Keys

그림 4-13를 참조하세요.

번호	주의 사항
①	Open the EMC file
②	Save as an emc file
③	스캔 테스트
④	테스트 일시 중지
⑤	테스트 중지
⑥	Spot Measurement
⑦	자동화된 최종 테스트
⑧	수동 최종 테스트
⑨	Display Curves: PK, AV, PK+AV
⑩	Display data that falls outside the limit curve
⑪	최종 체크포인트에 대한 표시 데이터
⑫	겹치는 데이터 포인트를 표시하거나 숨깁니다(겹치는 데이터 포인트를 숨기면 곡선이 더 명확해집니다).
⑬	Zoom In/Out: You can zoom in on the curve for easier viewing. After clicking, scroll the middle mouse button wheel in the curve display area to zoom in or out.
⑭	Test Report Settings
⑮	Print a report that includes final test point data
⑯	Print a report that includes data on points of interest
⑰	소프트웨어를 종료합니다
⑱	Displays the parameters of the device’s internal modules; intended solely for use by professional engineers during debugging.

5. Pre-Test Preparation and System Setup

5.1 테스트 환경 요구 사항

Shielded Room Solution (Compliance Testing): Formal conformity assessment testing must be conducted in a standard-compliant electromagnetic shielded room that completely isolates the test subject from external interference, ensuring the authority of the test results.

Standard Room Specifications (Preliminary Testing): A separate room with an area of at least 15 square meters and free of other equipment that causes strong electromagnetic interference may be used for R& D preliminary testing; priority should be given to rooms on the first floor to facilitate grounding and reduce grounding resistance.

Sufficient space must be reserved in the test area to accommodate the length of the slide rails and the spacing requirements for equipment layout.

5.2 Requirements for Standard Test Setups

The test setup strictly complies with the requirements of the CISPR 16-2-2 / GB/T 6113.202 standard and is divided into two configurations—desktop and floor-standing—based on the type of equipment under test.

5.2.1 Layout of Benchtop Equipment Under Test (EUT)

See Figure 5-1 (taken from CISPR 16-2-2, Figure 8).

Place the insulation test bench above the ground reference plane, with the bench top at a height of 0.8 m; place the equipment under test securely on the test bench, with the rear of the equipment 0.4 m away from the metal wall or ground reference plane.

Place an insulated slide rail that is 0.8 m high horizontally; the rail must be at least 6 m long and located on the same horizontal plane as the equipment under test.

The lead under test (LUT) must be straightened and placed horizontally, with one end connected to the device under test and the other end extending along the slide rail and hanging naturally to the ground, where it is connected to a power source; The total length of the test lead shall be no less than 7.5 m (including a 6 m section on the slide rail, a 1 m hanging section, and a 0.5 m allowance). If the length of the equipment’s original power cord is insufficient, it must be extended using a replacement cord of the same type and construction.

Open the Absorbing Clamp, insert the wire under test into the center hole of the clamp, close the clamp, and secure the latch; place the Absorbing Clamp on the slide rail, where it can slide freely along the rail.

The initial distance between the slide rail reference point (SRP) and the clamp reference point (CRP) is set to 10 ± 1 cm. This distance has a significant impact on the test results and must be strictly controlled.

Connect an attenuator, coaxial cable, and the EMI-9KB receiver to the output of the absorption clamp as specified in Chapter 3. Place the receiver on the outer side of the end of the slide rail to avoid interfering with the test area.

5.2.2 Floor-Standing Equipment Under Test (EUT) Layout

See Figure 5-2 (taken from CISPR 16-2-2, Figure 9).

Place a metal grounding reference plate measuring at least 2 m × 2 m on the floor. Place an insulating mat 0.1 m high on top of the metal plate, and place the device under test securely on the insulating mat.

The insulated slide rail remains at a height of 0.8 m and is positioned horizontally next to the equipment under test; the layout of the remaining wires, the installation of the absorption clamps, and the spacing requirements are all consistent with those for the benchtop equipment setup.

All surfaces of the device under test must be at least 50 cm from the edge of any metal plate and at least 80 cm from any surrounding conductive objects.

6. Procedure for Interference Power Testing

6.1 Powering On and Warm-up

First, turn on the Isolation Transformer, then turn on the EMI-9KB receiver, and finally turn on the computer and launch the test software;

After turning on the receiver, let it warm up for 10 minutes; wait until the internal circuitry has stabilized before beginning the test;

Turn on the power to the device under test to bring it into normal operating mode, and allow it to warm up to a stable operating state in accordance with the standard requirements (typically 15 to 30 minutes).

6.2 Confirmation of Test Parameters

6.2.1 표준 선정

Refer to Section 4.2.2.2. Go to the standard selection menu and choose the standard labeled “Power”; this is the standard for Absorbing Clamps. See Figure 6-1.

6.2.2 감쇠기 설정

Refer to Section 4.2.2.3 and select a 6 dB attenuator, as shown in Figure 6-2.

6.4 스캔 테스트

Click “Scan Test,” wait for the scan to complete. If an error occurs, click “Stop Test,” make the necessary adjustments, and then restart the test. Once the scan is complete, see Figure 6-3.

붉은 선: 준정점(QP) 한계선;

Blue line: Average (AV) limit line;

Green curve: Peak (PK) test curve;

파란색 곡선: 평균(AV) 검사 곡선.

6.5 기말 고사

If the average values (AV) of the test results are all below the limit curve, and the peak values (PK) are all below the quasi-peak (QP) limit curve, then the EUT meets the standard requirements, because the actual quasi-peak (QP) value measured during testing will not exceed the peak (PK) value. If the tested peak value (PK) exceeds the quasi-peak (QP) limit curve, the EUT is not necessarily non-compliant with the standard; a final test must be conducted.

6.5.1 Automatic Final Testing

Enter the number of frequency points to be tested, and the software will automatically select frequency points based on the test curve to perform the final test, as shown in Figure 6-4.

6.5.2 Manual Final Testing

In the software test curve area, right-click on the point where the final test is to be performed, as shown in Figure 6-5.

번호	주의 사항
①	엔드포인트 추가
②	끝점 삭제
③	After adding all the required final test points, click “Start Final Test.”
④	If you no longer wish to participate in the final test, click “Cancel Final Test.”
⑤	The blue diamonds indicate the locations of the added final test points

6.5.3 관심 지점 추가

그림 6-6를 참조하세요.

번호	주의 사항
①	Click to clear all frequency points and data from the current screen.
②	Tap to edit the frequency point status; tap again to exit the frequency point edit mode.
③	Frequency points to be edited; you can manually enter each frequency point
④	You can directly load the frequency point file you edited earlier.
⑤	You can save the frequency point data file you are currently editing so that it can be directly loaded during the final test.
⑥	Click “Create Data” to directly read the test data for the corresponding frequency points from the current test report.
⑦	Read the test data for the corresponding frequency points from the current test report
⑧	Click “Clear Data” to clear the data that has been read.
⑨	현재 초점 위치 데이터를 테스트 보고서에 저장하려면 확인을 클릭하십시오.
⑩	Click EXIT to exit immediately without saving the current screen’s focus point data.

6.5.4 Interpretation of Final Test Data

See Figures 6–7. The red X marks the quasi-peak (QP) values from the final test. If all quasi-peak (QP) values from the final test are below the quasi-peak (QP) limit curve, the EUT meets the standard requirements. Otherwise, it does not meet the standard requirements.

6.6 Save and Print the Test Report

See Section 4.2.1 to save or print the test report.

6.7 Procedure for Shutting Down the System at the End of the Test

Ensure the equipment is in the “Test Stop” state → Disconnect the coaxial cable from the EMI-9KB receiver → Turn off the EUT’s power → Turn off the receiver and the computer → Turn off the Isolation Transformer.

7. Daily Maintenance and Care of Equipment

7.1 일상적인 유지 보수

7.1.1 Absorbing Clamp

After each use, wipe the surface of the pliers with a dry, soft cloth to remove dust and stains; Do not use highly corrosive solvents such as gasoline, acetone, or thinners for cleaning. To remove stubborn stains, use a lint-free cloth dipped in a small amount of anhydrous ethanol to wipe the surface quickly, then dry it immediately.

Check the latch and hinge of the pliers monthly to ensure they open and close smoothly; you may apply a small amount of silicone grease for lubrication. Inspect the N-type output connector, remove any oxidation, and cover it with the protective cap when not in use to prevent dust from entering.

Handle the equipment with care; do not drop or subject it to impact, to prevent the internal ferrite magnetic rings from breaking. Do not use the pliers to grip hard objects or apply excessive force when opening or closing them.

Do not disassemble the clamp body on your own. The internal magnetic ring and structural alignment have been calibrated before leaving the factory; disassembly will result in a loss of testing accuracy.

7.1.2 Coaxial Cables and Attenuators

동축 케이블을 심하게 구부리거나, 밟거나, 무거운 물체로 압력을 가하지 마십시오. 보관할 때는 내부 도체가 손상되지 않도록 느슨하게 감아 두십시오.

감쇠기 및 커넥터와 같은 정밀 액세서리는 떨어뜨려 내부 손상을 방지하기 위해 조심스럽게 다루십시오.

7.2 보관 사양

7.2.1 Storage Environment Requirements

Temperature: 5°C to 35°C; relative humidity: ≤65% RH; dry, dust-free environment free of corrosive gases.

7.2.2 Long-Term Storage Operations

Turn off the power and unplug all cables; clean the equipment and wrap it in dust-proof film.

7.3 Calibration Interval Requirements

To ensure the measurement accuracy and operational reliability of the equipment, it is recommended that it be sent periodically to a qualified third-party metrology organization for calibration. The recommended calibration interval is 12 months. Users may determine the specific calibration interval based on frequency of use, environmental conditions, and quality system requirements.

8. 문제 해결 및 일반적인 문제 해결 방법

8.1 Absorbing Clamps

결함 증상	순서
The suction forceps do not open and close smoothly, and the latch does not secure tightly	Clean the pivot shaft and apply a small amount of silicone grease for lubrication; remove any foreign objects from inside the jaws and verify that the magnetic ring is undamaged; ensure the diameter of the cable being tested is ≤20 mm, and replace it with a suitable cable.

8.2 EMI-9KB 리시버

결함 증상	순서
Various error messages may appear while using the software, such as the software failing to open or errors occurring during scanning.	Make sure you’re logged in to your computer with an administrator account, and make sure the software is running with administrator privileges.
The software worked normally during the scan test, but froze during the final test.	The final test has stricter communication requirements than the scan test. Please ensure that you are using only our original communication cable and no other communication cables or extension cords; please ensure that you are using the communication port on the back of the desktop computer (USB ports on laptops and those on the front of desktop computers typically do not provide sufficient power, which may interfere with communication); if that still does not work, please try adding an RS232 port to your computer and use only an RS232 cable for communication—do not use an RS232-to-USB adapter.
검사 결과는 일반적으로 예상보다 낮거나 높습니다.	Please verify that the software attenuator settings match the actual conditions.
Test results are consistently close to background noise, and the EMI receiver cannot detect any signals.	동축 케이블 연결 상태를 확인하고, 동축 케이블을 교체한 후 다시 시도해 보세요.
과도하게 높은 배경 소음과 테스트 데이터의 상당한 변동	Verify that all equipment in the system uses Isolation Transformers; optimize the grounding system to reduce ground resistance; turn off other electrical equipment in the laboratory or conduct testing inside a shielded room.