EFT refers to electric fast transients, high-voltage bursts a transient immunity generator emits when testing an electrical device’s conducted susceptibility. A transient generator with EFT/burst capabilities will operate with a short rise time, high rate of repetition and generate relatively low energy transients, with the intention of emulating the switching of inductive loads. The switching of inductive loads in the field can be the toggling of an electric switch, a motor and relay system or adjacent bundles of cables.
An EFT is caused by a spark in the air or another gaseous discharge. Commonly, the opening of a switch through which current is flowing through does the trick. Arcing occurs between the contacts as the switch is opened. Initially, while the contacts remain close together, arcing commences at a low voltage and high frequency, and afterwards at a high voltage and low frequency as the contacts separate.
EFT/Burst Test Standards
- IEC 61000-4-4 | EFT/Burst immunity on supply, signal, control & earth ports