388 



ELECTRICAL MEASUREMENTS 



Suppose that no current flows through the detector at any 

 time. Then referring to Fig. 227 

 F.6 = V ad 

 Vi* = V dc 

 ix = IK 



IP = 1 B ix = IB 1>M 

 IN = in IM. 



I 

 FIG. 227. Mesh diagram for Maxwell bridge with four inductive arms 



Therefore, making no assumption as to the relation of i B to t 



(R M + R N )i M + (L M + L N ) 



dL 

 dt 



3 <) 



and 



- - /? y 



- riplB ~T 



(Rx ~h RP)IM ~h Cpx ~f" i'p) 



Eliminating i^ between (16) and (17) gives 

 din 

 dt 



di * 



~~17 



(17) 





[ RpL N + R N Lp 



(R M 



- (R x + R P )(L M 



(18) 





Eliminating -- between (16) and (17) gives 



~T 



~~TT [LtfLx LufLp] -j- ip [ 



-f- 



-f- 



- (R 





