Amplifier Card A13 Test Theory

TM 9-4931-363-14&P

contact 2 of S7-E to J9-9 and -23 to energize the

card will sense the difference between the two signal

noninverting input of AR5 and AR7. Setting S4 to position

amplitudes. With S9 set to position R3, the output of AR2

9 connects 5 volts ac, out of phase, through wiper 1 and

at J9-33 is connected to the meter for readout.

contact 10 of S4-G, and through wiper 2 and contact 8 of

S7-E to J9-11 and -25 to energize the inverting inputs of

(9) Refer to step 8 in figure 2-12 and in the A13 test

AR5 and AR7. As in the previous step, AR5 and AR7 will

table. Setting S9 to position R2 connects the output of

sense the difference between the two signal amplitudes.

AR4 on the A13 card at J9-27 to the meter for readout.

With S9 set to position R2, the output of AR8 at J9-3 is

Card operating power remains connected as previously

connected to the meter for readout.

discussed.

(11) Refer to step 10 in figure 2-12 and in the A13

test table. Setting S9 to position R3 connects the output of

(10) Refer to step 9 in figure 2-12 and in the A13

AR6 at J9-13 to the meter for readout. Card operating

test table. Setting S7 to position 1 connects 9 volts ac, out

power remains connected as previously discussed.

of phase, from the wiper of R8 through wiper 1 and

2-60