Application and Technical Analysis of Burst Pulse Generator in EMC Immunity Testing

Abstract
In the increasingly complex electromagnetic environment of electronic and electrical equipment, Electromagnetic Compatibility (EMC) performance has become a key indicator for measuring equipment reliability. Burst pulse interference, as a common form of electromagnetic interference in practical scenarios, may cause equipment malfunctions, performance degradation, or even damage. This paper takes the LISUN EFT61000-4 Burst Pulse Generator as the research object, and combines its technical parameters and application scenarios to conduct a detailed analysis of the core functions, compliance with standards, and practical testing value of the equipment. By interpreting the equipment’s hardware configuration, testing modes, and optional components, this paper expounds its application advantages in EMC compliance testing in fields such as consumer electronics, automotive electronics, industrial control, and medical devices, providing practical references for electromagnetic compatibility testing in related industries.

1. Introduction
With the rapid development of electronic technology, various types of electronic and electrical equipment are increasingly widely used in production, daily life, and industrial fields, and the electromagnetic interaction between devices has become increasingly complex. During processes such as power grid switching operations, relay contact bouncing, and motor starting and stopping, burst pulse interference with short duration, high frequency, and large amplitude will be generated. Although the single energy of such interference is relatively low, the dense pulse sequence may intrude into the interior of the equipment through conduction or radiation, interfering with the normal operation of the circuit and even causing serious problems such as data loss and control failure.

To ensure the stable operation of electronic and electrical equipment in complex electromagnetic environments, institutions such as the International Electrotechnical Commission (IEC) and the Standardization Administration of China have successively formulated burst pulse immunity testing standards. As the core equipment for conducting such tests, the burst pulse generator can accurately simulate burst pulse interference in practical scenarios, evaluate the equipment’s tolerance, and is a key tool for enterprises to achieve EMC compliance and improve product reliability. As a professional manufacturer of electromagnetic compatibility testing instruments, LISUN Group has launched the EFT61000-4 series burst pulse generators, which have been widely used in the industry due to their advantages of high precision, multi-scenario adaptation, and convenient operation. This paper will conduct a comprehensive analysis of the equipment from aspects of technical principles, equipment parameters, standard compliance, and application scenarios.

2. Working Principle and Core Functions of the Burst Pulse Generator
2.1 Working Principle
The core principle of the burst pulse generator is to generate a high-frequency pulse sequence that meets the requirements of standards through a high-voltage pulse generating circuit, and inject the pulse interference into the power port, signal port, or control port of the Equipment Under Test (EUT) through a coupling/decoupling network, so as to simulate the burst pulse interference encountered by the equipment in actual operation. Its working process mainly includes three stages: pulse generation, pulse coupling and interference injection, and test result monitoring.

In the pulse generation stage, the equipment generates high-frequency pulses with short rise time (usually at the ns level) and narrow pulse width through the internal oscillator and high-voltage module, and forms a pulse group according to the preset frequency and pulse train length; in the pulse coupling stage, the coupling/decoupling network is responsible for efficiently transmitting the pulse group interference to the EUT, while preventing the interference from feeding back to the power grid to ensure the stability of the test environment; after the interference injection, the tester judges the EUT’s tolerance to burst pulse interference by monitoring the working status of the EUT (such as whether the function is normal and whether the performance meets the standards).

2.2 Core Functions
As a high-precision testing equipment, the core functions of the LISUN EFT61000-4 Burst Pulse Generator focus on “accurate interference simulation, convenient test execution, and adaptation to multi-field needs”, which specifically include the following three points:
• High-Fidelity Interference Simulation: It can accurately simulate the burst pulse groups generated in scenarios such as power grid switching operations and relay contact bouncing. The pulse rise time can reach 5ns ±30%, and the pulse width (under 50Ω load) is 50ns ±30%, which conforms to the actual characteristics of high-frequency pulses and ensures the authenticity and reliability of test results.
• Standardized Test Process: It has built-in test procedures for mainstream domestic and foreign standards such as GB/T 17626.4-2018, IEC 61000-4-4:2012, and EN 61000-4-4:2012, and supports one-click calling of preset parameters, eliminating the need for complex manual settings, greatly improving test efficiency, and ensuring that the test process complies with industry specifications.
• Flexible Parameter Adjustment: The output voltage can be adjusted within the range of 0~5kV (some models can reach 0~6kV) according to test requirements, the pulse frequency supports continuous adjustment from 1kHz to 1000kHz, and the pulse polarity can be set to positive, negative, or automatic alternation of positive and negative, meeting the needs of different equipment and different test levels.

3. Technical Parameters and Standard Compliance of the LISUN EFT61000-4 Burst Pulse Generator
3.1 Detailed Technical Parameters
The LISUN EFT61000-4 series burst pulse generators include multiple models, which are suitable for different test scenarios. Their core technical parameters are shown in Table 1. The differences between different models mainly lie in the upper limit of output voltage and the current-carrying capacity of the coupling/decoupling network. For example, the EFT61000-4-32A has a built-in 32A, 3-phase/5-wire coupling/decoupling network, which is suitable for testing high-current equipment; the EFT61000-4-100A adopts an external 100A coupling/decoupling network to meet the testing needs of industrial-grade high-power equipment.
Table 1 Core Technical Parameters of LISUN EFT61000-4 Series Burst Pulse Generators

4. Application Scenarios and Optional Component Recommendations for the LISUN EFT61000-4 Burst Pulse Generator
4.1 Main Application Scenarios
With its flexible parameter adjustment and strong compatibility, the LISUN EFT61000-4 Burst Pulse Generator is widely used in fields such as consumer electronics, automotive electronics, industrial control, and medical devices. The specific application scenarios are as follows:
• Consumer Electronics Field: It is used for EMC testing of smartphones, laptops, and household appliances (such as refrigerators and washing machines). For example, during the production process of washing machines, this equipment is needed to simulate the pulse group interference generated by power grid switching operations, test whether the control circuit of the washing machine will have malfunctions (such as sudden shutdown and program disorder), and ensure the stability of the product in the home electricity environment.
• Automotive Electronics Field: It is used for immunity testing of on-board navigation systems, on-board entertainment systems, engine control systems, and other equipment. During the driving process of a car, a large number of burst pulses will be generated by relay contact bouncing, motor starting, etc. By simulating such interference with this equipment, it is possible to evaluate whether the on-board equipment will have problems such as signal interruption and functional failure, so as to ensure driving safety.
• Industrial Control Field: It is suitable for testing industrial equipment such as PLCs (Programmable Logic Controllers), frequency converters, and sensors. The power grid environment in industrial sites is complex, and frequent equipment start-stop will generate strong pulse group interference. Testing with this equipment can ensure that industrial control equipment can still accurately control the production process in an interference environment, and avoid production stagnation caused by equipment failures.
Medical Device Field: It is used for EMC testing of medical devices such as ECG monitors, ventilators, and ultrasonic diagnostic equipment. Medical devices have extremely high requirements for stability. Burst pulse interference may cause problems such as equipment data acquisition errors and alarm failure. Testing with this equipment can ensure that medical devices operate reliably in the complex electromagnetic environment of hospitals and protect patients’ lives.

4.2 Recommendations for Optional Components
To build a test environment that meets standard requirements and expand the test range of the equipment, LISUN Group provides targeted optional components. The specific recommendations are as follows:
• EFT-CLAMP Capacitive Coupling Clip: If it is necessary to test network signal lines (such as RJ45 Ethernet interfaces and USB interfaces), it is recommended to select this capacitive coupling clip. The traditional coupling method mainly targets power ports, while the capacitive coupling clip can inject pulse group interference into the signal lines through capacitive coupling, simulating the radiation interference encountered by the signal lines in actual use, and meeting the requirements for signal port testing in GB/T 17626.4-2018.
• EFT-DESK Standard Test Bench: To ensure the consistency and stability of the test environment, it is recommended to select this standard test bench. The test bench is made of insulating materials, and the tabletop grounding meets the standard requirements, which can avoid the interference of the external environment (such as ground stray current) on the test results. At the same time, it provides a standardized equipment placement space to ensure that the connection between the EUT, the coupling/decoupling network, and the generator conforms to the standard layout, thereby improving the accuracy of the test results.

5. After-Sales Support and Advantages of the LISUN EFT61000-4 Burst Pulse Generator
5.1 Comprehensive After-Sales Support
The LISUN EFT61000-4 Burst Pulse Generator has been sold in the market for more than 10 years, accumulating rich application experience. Its after-sales team has summarized a large number of Frequently Asked Questions (FAQ), which are continuously updated through the official website (https://www.lisungroup.cn/products/2143.html). Users can query solutions to problems related to equipment operation and troubleshooting through this link, and quickly solve the problems encountered during use. In addition, LISUN Group also provides equipment calibration services, and can issue calibration certificates that comply with standards such as EN 61000-4-4 and IEC 61000-4-4, ensuring that the equipment maintains high-precision testing performance for a long time.

5.2 Core Advantages of the Equipment
Compared with similar products, the LISUN EFT61000-4 Burst Pulse Generator has the following three major advantages:
• Convenient Operation: Equipped with a large Chinese-English Android touch screen, the interface is concise and intuitive, supporting touch operation, so that even non-professional testers can quickly master the use method of the equipment; it has built-in preset test procedures, and the test can be started with one-click calling, which greatly reduces the operation complexity.
• High Reliability: The equipment adopts high-quality components and rigorous circuit design, with stable pulse output. The error of key parameters such as internal resistance and rise time is controlled within ±30%, ensuring the repeatability and accuracy of test results; the working power supply supports AC220V/110V switching, adapting to the power grid environments in different regions and improving the versatility of the equipment.
• Scenario Adaptability: Multiple models are available for selection, and the current-carrying capacity of the coupling/decoupling network ranges from 16A to 100A, meeting the testing needs of low-power consumer electronics to high-power industrial equipment; it supports the selection of capacitive coupling clips and standard test benches, which can expand the test range and adapt to different test objects such as power ports and signal ports.

EFT61000-4_EFT Burst tester

6. Conclusion
Burst pulse interference is one of the main electromagnetic interferences faced by electronic and electrical equipment in actual operation. As a core tool for evaluating the immunity of equipment, the burst pulse generator is of great significance for improving the EMC performance of products and ensuring the stable operation of equipment. With its accurate interference simulation capability, complete standard compliance, wide scenario adaptability, and convenient operation experience, the LISUN EFT61000-4 Burst Pulse Generator has become an ideal choice for EMC compliance testing in fields such as consumer electronics, automotive electronics, industrial control, and medical devices.