(a) 



SWITCH 

 P05 1 

 REF 



IMPEDANCE 1 



MPEDANCE 2 



(b) 



SWITCH Zy 

 POS 2 

 MAG 



I DET I 



c — ^smj 



\r 



OSC I 



I DET I 









OSC I 



Cd) 



SWITCH 



POS 4 



RL 



I DET I 



I OSC I 



3 4 



(f) 



SENSE KEY 

 POS -, 



I DET j 



2 13 4 



I OSC I 



Fig. 27 — Sequence of impedance measurements. 

 1090 



