EFT testing is an immunity standard used to test how electrical and electronic equipment operate under interference. It involves several tests to check the compatibility of a device with fast transients such as power line and data line transients.
EFT testing steps include: verifying operating conditions in the laboratory, EFT waveform verification, test execution, result evaluation, and test report preparation.
The following steps should be followed when executing an EFT test:
1. Verify the operating conditions in the lab. The EUT should be kept at the temperature and humidity listed in its manual. Electromagnetic conditions must be maintained so that the operation of the EUT is free from interference.
2. Verify the EFT waveform. Before the EFT waveform is applied to the EUT, it should be observed in an oscilloscope and documented to make sure that it complies with IEC/EN 61000-4-4 standard.
3. Conduct the test. EFT testing should be carried out at the normal operating conditions of the EUT. Under this step, a test plan, including functional testing and performance verification shall be carried out.
4. Evaluate results and prepare a test report. Any performance degradation or loss of functionality of the EUT shall be documented, relative to that defined before testing in the manufacturer’s catalog. The test report shall include a description, operating conditions of the EUT, test and performance of the EUT before and after testing, and observed effects of EFT testing on the EUT.
