This International standard specifies methods to measure the radio interference suppression
characteristics of passive EMC filtering devices used in power and signal lines, and in other
circuits.
The defined methods may also be applied to combinations of over-voltage protection devices
and EMC filtering devices.
The measurement method covers the frequency range from 9 kHz to several GHz depending
on the device and test circuit.
The standard describes procedures for laboratory tests (type tests) as well as factory tests.
Test methods with and without bias conditions are defined.
Measurement procedures are provided for unbiased and bias conditions. Measurements
under bias conditions are performed to determine potential non-linear behaviour of the EMC
filtering devices such as saturation effects in inductors with magnetic cores. This testing
serves to show the usability in a specific application (such as frequency converters that
produce high amplitudes of common mode pulse current and thus may drive inductors into
saturation). Measurement under bias conditions may be omitted if the non-linear behaviour
can be determined by other methods (e.g. separate saturation measurement of the inductors
used).