Section 4
4-5
Comparator
ControlledMicroprocessor
Windings Nx
X
P1
C1
Rx
Vx
C2
B(1)
P2
Nx
Controlled
Master PSU
Microprocessor
Ix
Ic
S
Vd
Rs
P1
VOLTMETER
Current
NANO-
-B(2)
nVd=a.Vd
ASSEMBLY
TOROID
P2
C1
C2
Vs
Demodulator
& Slave PSU
SERVO LOOP
Modulator
Magnetic
Detector
Flux
Nd Is
Ns
Figure 4-2 : Automatic DCC Bridge Balance
4.1.3. Automatic direct-current-comparator bridge balance.
With reference to Figure 4-2 , at the ampere-turn balance point, if:
Nx = number of turns in variable comparator winding
Ns = number of turns in slave fixed comparator winding
Is = current in the slave winding and Rs
Ix = current in the variable comparator winding and Rx
Vd = bridge voltage imbalance
Ic = core offset current
and:
Vos = the combined offset due to thermal voltage
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