Technical Characteristics and EMC Immunity Test Application Analysis of Burst Generator

Abstract:

The burst generator is a high-precision device specially designed for electromagnetic compatibility (EMC) immunity testing. Its core function is to simulate high-frequency burst interference that electrical and electronic equipment may encounter during actual operation, such as fast transient pulses generated by grid switching operations, relay contact bounce, etc. It is used to evaluate the equipment’s ability to withstand such interference and ensure stable operation in complex electromagnetic environments. The LISUN EFT61000-4 series burst generator fully complies with domestic and international EMC test standards, integrating standardized test procedures and intelligent operation functions, and is suitable for testing in consumer electronics, industrial control, automotive electronics and other fields. Based on the test principle and industrial value of the burst generator, combined with the technical parameters, standard compliance and functional characteristics of the LISUN EFT61000-4, this paper analyzes its application advantages and industry adaptability in EMC immunity testing, providing a technical reference for EMC compliance testing of electrical and electronic products.

Core Test Principle and Industrial Application Value of the Burst Generator

The burst generator is a special device designed for electrical fast transient/burst (EFT/B) immunity testing. Its core test principle is to simulate high-frequency, short-duration, high-repetition-rate burst interference encountered by electrical and electronic equipment in actual operation, and inject standard-compliant pulse signals into the power, signal or ground ports of the equipment under test through coupling/decoupling networks or capacitive coupling clamps. The working status of the equipment under test is observed and evaluated to determine whether it meets EMC immunity standards.

Such burst interference mainly comes from daily electrical operations such as switching of inductive loads in the power grid, relay contact bounce, and switching of switching power supplies. Its typical characteristics are nanosecond-level rise time, microsecond-level pulse width, and MHz-level high frequency band. Although the energy is low, the repetition frequency is extremely high, which can easily be coupled into the equipment through cables, causing functional abnormalities such as CPU logic errors, data transmission garbled codes, and relay mis-triggering, and even breakdown of interface chips and filter components resulting in hardware damage. With the development of electrical and electronic products toward miniaturization, intelligence and high integration, the sensitivity of internal circuits to electromagnetic interference has increased significantly. As a core device for restoring such interference scenarios, the burst generator has become an indispensable EMC testing tool in product R&D, production quality control and market access certification.

The test results of the burst generator are directly related to the product’s market access qualifications. For example, EU CE certification and domestic 3C certification list EFT/B immunity testing as a key item. The test basis is mainly domestic and international standards such as GB/T 17626.4-2018 and IEC 61000-4-4:2012. Different industries and application scenarios have clear classifications for test voltage levels and pulse frequencies. A professional burst generator must accurately reproduce the pulse waveform parameters specified in the standards, and have flexible parameter adjustment and intelligent operation capabilities to meet the testing needs of various fields and types of products.

Technical Design and Standard Compliance of LISUN EFT61000-4 Burst Generator

The LISUN EFT61000-4 series burst generator is a high-precision device developed for EFT/B immunity testing. Its overall design strictly follows core domestic and international standards such as GB/T 17626.4-2018, IEC 61000-4-4:2012 and EN 61000-4-4:2012. From pulse waveform parameters and hardware configuration to functional design, all designs focus on the accuracy, standardization and intelligence of EMC testing, making it the preferred device for EFT/B immunity testing in various industries.

2.1 Standardized Pulse Waveform Parameter Control

The core performance of the burst generator depends on the accuracy of pulse waveform parameters. All parameters of LISUN EFT61000-4 fully meet the standard requirements: the pulse rise time is controlled at 5ns±30%, and the pulse width at 50Ω impedance is 50ns±30%, which is highly consistent with the waveform parameters specified in IEC 61000-4-4:2012; the output voltage covers multiple ranges of 0~5kV/0~6kV, and the pulse frequency is continuously adjustable from 1kHz to 1000kHz, which can meet different test level requirements from 1kV in residential environments to 4kV in power systems; it supports positive/negative pulse output and automatic positive/negative alternating mode, which can simulate bidirectional pulse interference in actual electromagnetic environments and comprehensively evaluate the immunity of the equipment under test.

At the same time, the internal resistance of the device can be switched between 50Ω±20% and 1000Ω±20%, adapting to different test impedance requirements of power ports and signal ports; the burst length (0.01ms~20ms) and burst period (100ms~500ms) are freely adjustable, and the test time is accurately set from 1s to 9999s. Test parameters can be flexibly configured according to the test standards of different products, effectively eliminating errors caused by manual adjustment.

2.2 Full-Scene Coupling Test Capability

To meet the EFT/B immunity test requirements of different ports, LISUN EFT61000-4 is equipped with various specifications of coupling/decoupling networks. The basic model has a built-in 16A, 3-phase/5-wire coupling/decoupling network, and models with built-in 32A and external 100A are also available, which can meet the power port testing of low-power consumer electronics and high-power industrial control equipment; for the testing of network signal lines such as RJ45, the device can be equipped with a special LISUN EFT-CLAMP capacitive coupling clamp to realize non-contact pulse injection, avoiding damage to signal lines caused by direct testing, fully complying with Clause 6.4 of IEC 61000-4-4:2012.

In addition, the device can be optionally equipped with an EFT-DESK standard test table, which can quickly build a standard-compliant test environment including a ground reference plane and insulating supports, ensuring that the coupling effect of pulse signals during testing is consistent with actual working conditions and guaranteeing the reliability and repeatability of test results.

2.3 Intelligent Operation and Calibration System

LISUN EFT61000-4 is equipped with a large Android touch screen in Chinese and English, with built-in preset test programs of GB/T 17626.4 and IEC/EN 61000-4-4 and other standards, supporting one-key parameter calling without tedious manual configuration, greatly improving test efficiency; the device supports arbitrary setting of test modes or IEC levels, and can customize test schemes according to personalized customer needs, adapting to different scenarios such as scientific research and batch testing.

To ensure the long-term accuracy of pulse waveforms, the device can be equipped with an EFT-CAL calibration kit including 50Ω and 1000Ω high-frequency attenuators, which can complete pulse waveform calibration in accordance with Clause 6.2.3 and Appendix B of GB/T 17626.4-2018, ensuring that the device still maintains standard waveform parameters after long-term use, meeting the requirements of laboratory metrological calibration and test result traceability.

2.4 Wide Power Adaptation and Safety Design

The device adopts a wide-voltage working power supply of AC220V (110V optional) ±10%, 50/60Hz, which can adapt to power grid environments in different regions at home and abroad, facilitating cross-regional use in laboratories; at the same time, it has a complete safety protection design, effectively preventing overvoltage and overcurrent damage during high-frequency pulse output, ensuring the safety of testers and equipment, and meeting the needs of long-term continuous testing in laboratories.

Model Specifications and Test Adaptability of LISUN EFT61000-4 Series Burst Generator

According to the EFT/B immunity test requirements of products with different powers and scenarios, LISUN has launched six models of the EFT61000-4 series burst generator. Each model features differentiated design in output voltage and coupling/decoupling network specifications, fully covering testing needs in consumer electronics, industrial control, automotive electronics, medical devices and other fields. The specific parameters and applicable scenarios are shown in the table below:

Model	Output Voltage	Coupling/Decoupling Network	Application Scenarios
EFT61000-4	0~5kV	Built-in 16A, 3-phase/5-wire	Consumer electronics, small household appliances, low-power sensors
EFT61000-4A	0~6kV	Built-in 16A, 3-phase/5-wire	Low-power automotive electronics, portable medical devices, smart home
EFT61000-4-32A	0~5kV	Built-in 32A, 3-phase/5-wire	Industrial PLC, medium-power inverters, car navigation equipment
EFT61000-4A-32A	0~6kV	Built-in 32A, 3-phase/5-wire	High-power industrial motors, core medical modules, low-voltage NEV parts
EFT61000-4-100A	0~5kV	External 100A, 3-phase/5-wire	Power system equipment, large industrial cabinets, high-voltage inverters
EFT61000-4A-100A	0~6kV	External 100A, 3-phase/5-wire	Substation auxiliary equipment, heavy machinery electrical systems, high-voltage NEV parts

All models retain the core characteristics of the LISUN EFT61000-4 burst generator: standard pulse waveform parameters, intelligent operation interface, and multi-polarity pulse output. Only targeted designs are made in power and coupling networks, which can meet the full range of EFT/B immunity testing from low-power civil products to high-power industrial equipment. All models support optional accessories such as capacitive coupling clamps and calibration kits to expand and upgrade test functions.

Industry Applications of LISUN EFT61000-4 Burst Generator

With accurate pulse waveform control, comprehensive standard compliance and flexible model selection, the LISUN EFT61000-4 burst generator has become core equipment for EFT/B immunity testing in consumer electronics, industrial control, automotive electronics, medical devices and other fields. It can effectively simulate actual electromagnetic interference scenarios and provide scientific and reliable test data for product EMC design optimization and compliance certification.

4.1 Consumer Electronics Industry

Consumer electronics such as mobile phones, chargers and smart home devices are mostly used in ordinary electromagnetic environments such as residences and offices, and their EFT/B immunity testing mainly requires a voltage level of 1kV~2kV. LISUN EFT61000-4 and EFT61000-4A models can test the power ports and signal ports such as USB/Bluetooth of such products, simulate pulse interference generated by grid switching operations, verify whether the equipment crashes, loses data or malfunctions during daily use, and ensure that the products meet Class 2 requirements of GB/T 17626.4-2018 and 3C certification market access standards.

4.2 Industrial Control Industry

Industrial control equipment such as PLCs, inverters and industrial control cabinets operate in complex industrial electromagnetic environments and are easily affected by burst interference generated by relay actions and motor start-stop, with test voltage levels requiring 2kV~4kV. Medium and high-power models such as LISUN EFT61000-4-32A and EFT61000-4A-32A can inject high-voltage pulses into their power ports, and cooperate with capacitive coupling clamps to test industrial communication ports such as RS485 and CAN, verifying the control accuracy and communication stability of the equipment under interference, avoiding production accidents caused by electromagnetic interference, and meeting EMC standards for industrial equipment such as EN 61326-1.

4.3 Automotive Electronics Industry

Automotive electronic equipment such as vehicle ECUs, sensors, low-voltage/high-voltage components of new energy vehicles need to withstand strong burst interference generated by vehicle startup and relay switching, with higher requirements for EFT/B immunity. The LISUN EFT61000-4A series can output high-voltage pulses of 0~6kV, adapting to the high-level test requirements of automotive electronics. It can also simulate the complex electromagnetic environment of the vehicle power grid and conduct comprehensive tests on the power and signal ports of on-board equipment to ensure stable operation during driving, complying with automotive electronics EMC standards such as ISO 16750-2 and ISO 7637-2.

4.4 Medical Device Industry

Medical devices such as patient monitors and portable diagnostic equipment are highly sensitive to electromagnetic interference. Burst interference can easily lead to detection data errors, equipment misoperation and even endanger patient safety. The LISUN EFT61000-4 series burst generator can realize low-voltage and high-precision pulse testing, and cooperate with a standard test table to build a shielded test environment to avoid external interference affecting test results, verifying the immunity of medical devices in complex hospital electromagnetic environments and ensuring compliance with medical device EMC standards such as YY 0505.

4.5 Third-Party Testing and Certification Field

As the core link of product EMC compliance certification, third-party testing institutions such as SGS and CQC have extremely high requirements for the standard compliance and data accuracy of the burst generator. The LISUN EFT61000-4 series fully covers core domestic and international EMC standards, with authoritative and mutually recognizable test data. It can complete EFT/B immunity testing for international and domestic certifications such as CE, 3C and UL, providing efficient and accurate test solutions for testing institutions and helping enterprises quickly pass market access certification.

Core Competitive Advantages of LISUN EFT61000-4 Burst Generator

Compared with traditional burst generators, LISUN EFT61000-4 has significant advantages in test accuracy, operation convenience and industry adaptability, further improving the efficiency and reliability of EFT/B immunity testing and becoming a benchmark device in the EMC testing field:

• Accurate Waveform Parameters: Core parameters such as pulse rise time, pulse width and voltage strictly comply with IEC/GB standards, with deviations controlled within the standard allowable range, ensuring the accuracy and repeatability of test results that can be directly used for product compliance certification;

• Intelligent Operation Functions: Equipped with a Chinese and English Android touch screen, built-in standardized test programs, supporting one-key parameter calling, greatly reducing the manual operation threshold and improving batch test efficiency. It also supports custom test modes to meet personalized needs of scientific research and development;

• Full Coverage of Test Scenarios: Six models in the series cover output voltages of 0~6kV and coupling power of 16A~100A. It can be equipped with accessories such as capacitive coupling clamps and calibration kits to realize full-port testing of power, signal and ground ports, adapting to testing needs of various industries and types of products;

• Full Compatibility with Standard Systems: Fully complies with domestic and international standards such as GB/T 17626.4-2018, IEC 61000-4-4:2012 and EN 61000-4-4:2012, and is compatible with North American standards such as ANSI/IEEE C62.41-1991, realizing full coverage of certification testing in major global markets;

• Professional After-Sales Support: The device has been sold on the market for more than 10 years. LISUN’s engineer team has summarized a complete after-sales solution, and provides professional services such as equipment calibration and maintenance to ensure long-term stable operation.

Conclusion

As the core equipment for EMC immunity testing, the test accuracy of the burst generator is directly related to the operational reliability and market access qualifications of electrical and electronic products in complex electromagnetic environments. With standardized pulse waveform control, intelligent operation design and full-scenario testing capabilities, the LISUN EFT61000-4 series burst generator has become a professional device for EFT/B immunity testing in various industries. It can effectively simulate high-frequency pulse interference generated by grid switching, relay operation and other conditions, providing scientific and reliable test data for product EMC design optimization, quality control and compliance certification.

Driven by 5G, artificial intelligence, new energy and other technologies, the electromagnetic environment of electrical and electronic products has become increasingly complex, and the requirements for EMC immunity testing have become stricter. The technical value of the burst generator will become more prominent. The development and application of the LISUN EFT61000-4 series burst generator not only meet the EFT/B testing needs of multi-field and multi-power products, but also provide technical support for enterprises to improve product EMC performance and reduce the risk of electromagnetic interference failures. In the future, with the continuous updating of EMC standards and the continuous development of testing technology, burst generators with higher accuracy, more intelligent functions and wider adaptability will become the industry trend. LISUN EFT61000-4 will also continue to upgrade and optimize to provide better solutions for EMC immunity testing in various industries.

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