1416 THE BELL SYSTEM TECHNICAL JOURNAL, NOVEMBER 1953 



MAGNETIZING S I ^, 

 WINDING 2S(cr>'^ 



MICRO- 

 AMMETER 



(a) 



C CLOSED 

 (b) 

 OPEN 



CLOSED 



OPEN 



CLOSED 



(c) 



(d) 



OPEN 



K= 



(e) 



(f) 



r 



E=Jiixio-8:=: 



I 



(? 



(Rc+Rm) (g) 



EQUIVALENT LINEARIZED CIRCUIT 



Fig. 1 — Fundamental operation of dynamic measuring set. 



