TB 9-6625-862-24
(3) While maintaining OUTPUT LEVEL meter indication recorded in (2) above, set
FREQUENCY RANGE switch and FREQUENCY dial for 40 Hz, 200 Hz, 2 kHz, and 20 kHz.
Multimeter indication will be between 23.12 and 32.66 V.
(4) Adjust AMPLITUDE (OUTPUT) control to 0.
b. Adjustments. No adjustments can be made.
12. Input Level Meter
a. Performance Check
(1) Connect INPUT connector to INPUT ground connector.
(2) Adjust zero adjustment screw on INPUT LEVEL meter for a 0 V indication.
(3) Remove test lead from INPUT connectors.
(4) Position controls as listed in (a) through (g) below:
INPUT ATTENUATOR (DB) (INPUT DB) switch to 0.
(a)
OUTPUT ATTENUATOR (DB) (OUTPUT DB) 0 to 100 switch to 30.
(b)
OUTPUT ATTENUATOR (DB) (OUTPUT DB) 0 to 10 switch to 6.
(c)
LOAD switch to OFF.
(d)
IMPEDANCE switch 5000.
(e)
FREQUENCY RANGE switch to X10.
(f)
FREQUENCY dial to 40.
(g)
(5) Connect multimeter between INPUT connector and INPUT ground connector.
(6) Connect upper INPUT connector to upper OUTPUT connector.
(7) Adjust AMPLITUDE (OUTPUT) control for a 2.0 V indication on INPUT
LEVEL meter. If multimeter does not indicate between 1.9 and 2.1 V ac, perform b below.
(8) Repeat technique of (7) above while adjusting AMPLITUDE (OUTPUT) control
for INPUT LEVEL meter indications listed in table 8. Multimeter indications will be
within limits specified.
Table 8. Input Level Meter Linearity Check
Test instrument INPUT LEVEL
Multimeter indications (V ac)
meter indications
Min
Max
1.5
1.4
1.6
1.0
0.9
1.1
0.5
0.4
0.6
(9) Adjust AMPLITUDE (OUTPUT) control to 0.
b. Adjustments
(1) Adjust AMPLITUDE (OUTPUT) control for a 2.0 V ac indication on multimeter.
indication on INPUT LEVEL meter (R).