TB 9-6625-967-35
(3) Adjust ac calibrator frequency to 1 kHz and amplitude output for 5 major
divisions of deflection on oscilloscope (A5) crt. If ac calibrator does not indicate between
l7.145 and 18.205 millivolts rms, perform b below.
(4) Turn TI MODE switch to CH2 and repeat (3) above.
b. Adjustments
(1) Adjust ac calibrator output for 17.675 millivolts rms.
(2) Adjust 10 MV GAIN R149 (fig. 1) for 5 major divisions of deflection for CH1, and
10 MV GAIN R249 (fig. 1) for 5 major divisions for CH2 on oscilloscope crt (R).
11. Amplifier Gain
a. Performance Check
(1) Turn TI CH1 and CH2 VOLTS/DIV switches to .02.
(2) Adjust ac calibrator output for 5 major divisions of vertical deflection on
oscilloscope (A5) crt. If ac calibrator does not indicate between 34.290 and 36.411 millivolts
rms, perform b below.
(3) Repeat technique of (1) and (2) above for TI VOLTS/DIV switch settings and
indications listed in table 4. Ac calibrator will indicate within limits specified.
Table 4. Amplifier Gain (Channels 1 and 2)
Test instrument
Ac calibrator
VOLTS/DIV
(rms)
switch position
Min
Max
.05
85.724
mV
91.026
mV
.1
171.44
mV
182.05
mV
.2
342.90
mV
364.11
mV
.5
857.24
mV
910.26
mV
1
1.7144
V
1.8205
V
2
3.4290
V
3.6411
V
5
8.5724
V
9.1026
V
10
17.144
V
18.205
V
(4) Turn TI MODE switch to CH1 and repeat (2) and (3) above.
b. Adjustments
(1) Adjust ac calibrator output for 35.35 millivolts rms.
(2) Adjust 20 MV GAIN R147 (fig. 1) for 5 major divisions of defection for CH1, and
20 MV GAIN R247 (fig. 1) for 5 major divisions of reflection for CH2 (R).
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