1. The cause of EFT/burst immunity test (IEC/EN 61000-4-4)
Switching transients (to cut off inductive load, relay contact bounce, etc.) usually interferes with other electrical and electronic equipment in the same circuit. This type of interferences are high amplitude, short rise-time, high repetition rate and low energy.
2. The purpose of EFT/burst immunity test (IEC/EN 61000-4-4)
To establish a common assessment basis for evaluating the performance of electrical and electronic equipment power supply port, signal, control, and grounding ports when subjected to electrical fast transient burst interference.
3. Test levels for electrical fast transient test
4. Features of EFT/burst generator
Compliant with latest standard of IEC/EN 61000-4-4 and GB/T17626.4
User friendly 7” touch panel display
Support multi-language & facilitate users
Built-in environment self-test program
Programmable operation
Pre-programmed IEC/EN 61000-4-4 standard test levels
Wave shape of the pulse meet the requirements of 50ohm and 1000ohm load
The highest pulse frequency is up to 1.2MHz
RS232/USB Port, PC control operation & printable test report
5. IEC/EN 61000-4-4 EFT generator picture
6. Technical data of IEC/EN 61000-4-4 EFT/burst generator
Model | EFT S4 |
Compliant standard | IEC/EN61000-4-4, GB/T 17626.4 |
Operation | 7” touch panel display |
Output voltage | 0.2 ~5kV |
Frequency | 1kHz~1200kHz ±10%, continuously adjustable |
Polarity | Positive/negative/alternating |
Running time | 1~9999s, continuously adjustable |
Internal impedance | 50Ω ±10% |
Pulse rise time | 5ns ±30% |
Pulse width | 50ns ±30% (50Ω load) |
35ns~150ns (1kΩ load) | |
Output mode | IEC, user-defined, programmable |
Coupling-out | BNC, coupling/decoupling network |
Number of pulses | 1~255, continuously adjustable |
Phase | 0~359°synchronous, asynchronous, automatic |
Burst period | 150~9999ms, continuously adjustable |
Coupling/decoupling network | Built-in, single-phase three-line, 16A (Custom specific on demand) |
Power supply | AC 220V ±10% 50/60Hz |
Ambient temperature | 15℃~35℃ |
Coupling decoupling network technical parameters | |
Voltage | 0~6kV |
Attenuation ratio | <10% |
Coupling capacitor | 33nF |
Coupling mode | L, N, PE freely combined |
Capacity | AC 220V 16A |
7. Circuit diagram of the EFT generator
8. EFT test configuration: capacitive coupling clamp (optional)
The capacitive coupling clamp can couple EFT (fast transient)/burst to the test line without any electrical connection to the terminal of the device under test, the cable shield, or any other part of the device under test. It is used together with EFT/burst generator and used to do EFT/burst interference test of the I/O data signal line port. Its main purpose is coupling the EFT/burst interference to the I/O data signal line of the EUT. Product fully comply with standard IEC/EN 61000-4-4, GB/T 17626.4.
Specification:
Max coupling voltage | ±7KV |
Port | BNC |
Coupling capacity | 100~1000pF |
Specs of coupling plate | 140*1000mm |
9. Test setup
A test setup for laboratory type tests
A test setup using a floor standing system of two EUTs
