The scope of IEC 61000-4-4 relates to the immunity of electrical and electronic equipment to repetitive electrical fast transients. IEC 61000-4-4 gives immunity requirements and test procedures related to electrical fast transients/bursts. IEC 61000-4-4 additionally defines ranges of test levels and establishes test procedures.
The object of IEC 61000-4-4 is to establish a common and reproducible reference for evaluating the immunity of electrical and electronic equipment when subjected to electrical fast transient/bursts on supply, signal, control and earth ports. The test method documented in IEC 61000-4-4 describes a consistent method to assess the immunity of an equipment or system against a defined phenomenon.
IEC 61000-4-4 gives specifications for laboratory and post-installation tests.The repetitive fast transient test is a test with bursts consisting of a number of fast transients, coupled into power supply, control, signal and earth ports of electrical and electronic equipment. Significant for the test are the high amplitude, the short rise time, the high repetition rate, and the low energy of the transients.
The test is intended to demonstrate the immunity of electrical and electronic equipment when subjected to types of transient disturbances such as those originating from switching transients (interruption of inductive loads, relay contact bounce, etc.)..