Figure 19. Detector and electrometer assembly, schematic diagram

Figure 19. Detector and electrometer assembly, schematic diagram

and maintained at a high level for

the t h e r m a l r e l a y s . U n d e r t h i s

c o n d i t i o n , the load resistors for

coupling to the metering circuit.

detectors V2A and V2B are re-

I n the CW AVERAGE position of

the function switch, thermal relays

t u r n e d to chassis ground by the

m u c h l o w e r resistance of the

K1 and K2 close. The closing of the

t h e r m a l relays is obtained by ap-

470,000-ohm resistors, R9 and

plying 6.3 volts ac power through

R 1 1 . Because of the considerably

function switch S702, terminal 7 of

l o w e r value of the time-constant

connector J2, and dropping re-

circuit, only average values of the

i n c o m i n g signal are detected and

s i s t o r s R14-R15 to the heaters of