This CDN is for use with shielded cables of 1 to 6 cores and unshielded cables of 1, 2, 3 and 6 cores. A general-purpose unit with particular application to low level sensors such as R/Ts and T/Cs, as well as to AC or DC power supplies up to 2amps at 250vac. Also to audio, security systems, RS232 and similar serial data circuits. Comes supplied with three alternative connecting cable sets: One 50Ω BNC for network S1, one user-configurable as S2- S6, and one user-configurable as M1-M3, or offering replacements for AF2, AF3, AF6, T2, T3 and T6. Also supplied are the 46ZZ calibration adaptors with each CDN. The whole system is supplied with a ground plane complete with spring clips to grip the CDN and an appropriate earth lead.