This work presents a wholly automated high impedance system working in
the frequency range 1 mHz-10 kHz and conceived to measure complex imp
edances (R-p // C-p) up to 10(12)Omega. Therefore we have built, surro
unding a gain phase analyser, a high impedance programmable electromet
er working on shunt mode. This apparatus using high resistances and lo
w leakage capacitors, resorts to the high impedance electronics, the c
omponents are selected by the way of very high insulating Reed switche
s drived by a VXI bus.