Test Technology of EFT Pulse Generator

Core Test Principle and Functional Value of EFT Pulse Generator

The core function of the EFT pulse generator is to simulate high-frequency electrical fast transient pulse burst interference generated by switching of inductive loads on power grids, relay bounce and switch actions. Such pulses feature an extremely fast rising edge of 5ns, high repetition frequency and continuous release of pulse clusters. Although single pulse energy is low, accumulated continuous charge will break down chip logic and trigger system disorder. In accordance with GB/T 17626.4 and IEC 61000-4-4 standards, the equipment outputs standard pulse waveforms, injects pulses into power lines and communication signal lines of equipment under test (EUT) through coupling decoupling networks or capacitive coupling clamps, and observes the operation status of the equipment throughout the process, so as to evaluate the product’s ability to withstand pulse interference and optimize filtering, grounding and protection circuits in advance.

As a standard EFT pulse generator, LISUN EFT61000-4 is equipped with an Android Chinese & English touch control system with a full set of built-in standard test programs for one-click recall. The pulse frequency is continuously adjustable from 1kHz to 1000kHz, supporting automatic alternating output of positive and negative pulses, and free switching between dual internal resistances of 50Ω/1000Ω. It fully covers all test severity levels from civil to industrial products, suitable for enterprise R&D debugging and compliance testing of third-party laboratories.

EFT61000-4_EFT Tester

Parameter Comparison of Full Series LISUN EFT61000-4 EFT Pulse Generators

Table 1 Specification Comparison of LISUN EFT61000-4 Series EFT Pulse Generators

The full series of EFT pulse generator adopts unified standard waveform parameters: pulse rise time 5ns±30%, pulse width 50ns under 50Ω load, pulse train length 0.01~20ms, and test duration programmable from 1~9999s. The standard EFT61000-4 features compact size with built-in 16A coupling decoupling network without extra accessories. It can be matched with EFT-CLAMP capacitive coupling clamp to complete communication line tests such as RJ45, EFT-CAL calibration kit to ensure accurate waveform measurement, and EFT-DESK standard test bench to build a compliant test environment.

Standard Complete Test Procedure of EFT Pulse Generator

Based on the interference simulation mechanism of the EFT pulse generator, EFT61000-4 forms a standardized reproducible test process:

• Test Environment Setup: Equip with special test bench and isolated power supply, calibrate equipment waveform, and connect corresponding coupling network or capacitive coupling clamp;
• Standard Parameter Recall: Select output voltage from 0.5kV~6kV according to product certification grade, set pulse frequency, pulse train period and positive-negative alternating mode;
• EUT Power-on Operation: The EUT operates under full load, and pulses are continuously injected into power ports or signal cables through coupling devices;
• Automatic Pulse Impact: The equipment outputs electrical fast transient pulse bursts cyclically for the set duration, and monitors equipment screen, data transmission and operating status throughout the test;
• Test Result Judgment: After the test cycle, the product passes immunity test without restart, crash, data disorder or function failure; if abnormality occurs, locate weak circuit points for rectification.

Applicable Industries and Standard Compliance Advantages

LISUN EFT61000-4 EFT pulse generator supports testing of all types of electrical and electronic products, covering household appliances, industrial automation, medical devices, automotive electronics, communication security, photovoltaic energy storage and other fields. The equipment fully complies with domestic and international authoritative standards including GB/T 17626.4-2018, IEC 61000-4-4:2012, EN 61000-4-4 and ANSI/IEEE C62.41. Test data is recognized by CNAS and CMA laboratories.

Compared with simple pulse burst equipment, this model features wider frequency adjustment range and dual internal resistance switching to adapt to both power supply and signal line tests. The Android large screen displays operating parameters intuitively, and built-in standard programs eliminate manual parameter calculation. The full series with graded current covers low-power to 100A high-power equipment, realizing multi-scenario application with one machine and reducing laboratory equipment procurement costs.

Conclusion

The EFT pulse generator is the core EMC instrument to verify the operational reliability of electronic equipment under complex power grid environments. It reproduces transient disturbance generated by relays and switches through standardized high-frequency pulses to quantify the anti-pulse interference level of products. With adjustable wide voltage & frequency range, graded coupling networks, complete supporting tooling and full standard compatibility, LISUN EFT61000-4 series EFT pulse generators balance test accuracy, easy operation and scenario versatility. It can efficiently support early-stage R&D rectification and mandatory EMC certification before product launch, serving as essential standardized test equipment for enterprise laboratories and third-party testing institutions.