Issues on AC Mains Cable Termination by CMAD

A common mode absorption device (CMAD) is listed in CISPR16-1-4 for use in terminating the mains cable of equipment under test (EUT) to improve measurement reproducibility in radiated disturbance tests. However, there are several issues in the termination of CMAD, such as differences in terminating impedance from that in real-world conditions, the need to maximize disturbance levels, and invalidation of CMAD characteristics due to cable type. This paper addresses these issues and suggests specifying termination impedance using a Very High-Frequency line impedance stabilization network (VHF-LISN) as a termination device for AC mains cable in lieu of CMAD.