Maintenance of publications: IEC 61000-4-13: Electromagnetic compatibility (EMC) - Testing and measurement techniques - Harmonics and interharmonics including mains signalling at a.c. power port, low frequency immunity tests and IEC 61000-4-16: Electromagnetic compatibility (EMC) -Testing and measurement techniques - Test for immunity to conducted, common mode disturbances in the frequency range 0 Hz to 150 kHz