TB 9-6625-2176-35
(3) If digital voltmeter does not indicate
between 0.171 and 0.182 V rms, perform b below.
and adjust for a 115-V ac output.
c. Set POWER switch to ON, and allow at least 5
from 105to 125 V ac. Digital voltmeter indication will
minutes for TI to reach operating temperature.
remain between 0.171 and 0.182 V rms.
(5) Adjust autotransformer output to
8. Amplitude Accuracy
115 V ac.
a. Performance Check
(6) Set AMPLITUDE and AMPLITUDE
RANGE switches to settings listed in table 4. If digital
voltmeter does not indicate within limits specified,
perform b below.
OUTPUT
using adapter, cable, and termination
(BI, B3, and B6).
b. Adjustments
(2) Position controls as listed in (a) through
(d) below:
(1) Connect negative side of digital voltmeter
(A3) to collector of Q127 (fig. 1) and positive to center
(a) AMPLITUDE
switch
to
5
and
arm of potentiomenter R55 (fig. 1) using leads (B5).
VARIABLE control to CAL.
(2) Set AMPLITUDE switch to 50 and
AMPLITUDE RANGE switch to.5-5V.
(b) AMPLITUDE RANGE switch to .5-
(3) Adjust potentiometer R55 for 1 V dc
5V.
+.005-V indication on digitial voltmeter (R).
(4) Set AMPITUDE switch to 5.
50kHz ONLY.
(5) Repeat a(l) above.
scale.
(6) Adjust potentiometer R51 (fig. 2) for
0.177-V rms indication on digital voltmeter (R).
Table 4. Amplitude Accuracy
Test instrument
Digital voltmeter indications
(V rms)
AMPLITUDE
AMPLITIDE RANGE
switch settings
switch settings
Min
Max
10
.5-5V
0.342
0.364
15
.5-5V
0.514
0.546
20
.5-5V
0.685
0.728
25
5-5V
0.857
0.910
30
.5-5V
1.028
1.092
35
.5-5V
1.200
1.274
40
.5-5V
1.371
1.456
45
.5-5V
1.543
1.638
50
.5-5V
1.714
1.820
50
50-500mV
0.169
0.184
50
5-50mV
0.0167
0.0186
5