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.NOTE Measurement methods in this standard may be applied up to 40 GHz.The standard describes procedures for laboratory tests (type tests) as well as factory tests.Test methods with and without bias conditions are defined.Measurement pro