TB 9-6625-862-24
(8) Set OUTPUT ATTENUATOR (DB) (OUTPUT DB) 0 to 100 switch to 20.
(9) Set FREQUENCY RANGE switch to X100 and turn FREQUENCY dial
to 200.
(10) Adjust AMPLITUDE (OUTPUT) control for a 5.0 V indication on multimeter.
Record OUTPUT LEVEL meter indication.
(11) While maintaining OUTPUT LEVEL meter indication recorded in (10) above,
set OUTPUT ATTENUATOR (DB) (OUTPUT DB) 0 to 10 switch to settings listed in
table 7. Multimeter indications will be within limits specified.
Table 7. Output Attenuator Check 0 to 10 dB
Test instrument OUTPUT
Multimeter indications (V or (dB))
ATTENUATOR (DB) switch
Min
Max
settings
1
4.32
(-0.75)
4.58
(-1.25)
2
3.85
(-1.75)
4.08
(-2.25)
3
3.43
(-2.75)
3.64
(-3.25)
4
3.06
(-3.75)
3.24
(-4.25)
5
2.73
(-4.75)
2.89
(-5.25)
6
2.43
(-5.75)
2.57
(-6.75)
7
2.17
(-6.75)
2.29
(-7.25)
8
1.93
(-7.75)
2.04
(-8.25)
9
1.72
(-8.75)
1.82
(-9.25)
10
1.53
(-9.75)
1.62
(-10.25)
b. Adjustments
(1) Adjust AMPLITUDE (OUTPUT) control for a 54.86 V indication on
(2) Adjust R29 (fig. 2) (R31 on some models) (R74 on TS-421C/U and model F370A,
fig. 3) for a +37-dB indication on OUTPUT LEVEL meter.
11. Output Level Frequency Response
a. Performance Check
(1) Position controls as listed in (a) through (d) below:
(a) OUTPUT ATTENUATOR (DB) (OUTPUT DB) 0 to 100 switch to 0.
(b) OUTPUT ATTENUATOR (DB) (OUTPUT DB) 0 to 10 switch to 6.
(c) FREQUENCY RANGE switch to X10.
(d) FREQUENCY dial to 100.
(2) Adjust AMPLITUDE (OUTPUT) control for a 27.483 indication on multimeter.
Record OUTPUT LEVEL meter indication.
