The scope of SANS / IEC 61000-4-3 is to establish a common reference for evaluating the immunity of electrical and electronic equipment when subjected to radiated, radio-frequency electromagnetic fields. The test method of SANS / IEC 61000-4-3 describes a consistent method to assess the immunity of an equipment or system against a defined phenomenon.
SANS / IEC 61000-4-3 deals with immunity tests related to the protection against RF electromagnetic fields from any source. Particular considerations are devoted to the protection against radio-frequency emissions from digital radiotelephones and other RF emitting devices.
Most electronic equipment is, in some manner, affected by electromagnetic radiation. This radiation is frequently generated by such general purpose sources as the small hand-held radio transceivers that are used by operating, maintenance and security personnel, fixed station radio and television transmitters, vehicle radio transmitters, and various industrial electromagnetic sources.
In addition to electromagnetic energy deliberately generated, there are also radiation caused by devices such as welders, fluorescent lights and switches operating inductive loads to name but a few.