TB 9-6695-261-35
(4) Set RMS VOLTS switch and control to settings listed in table 5. True rms
voltmeter will indicate within limits specified.
Test instrument RMS VOLTS
True rms voltmeter indication (V rms)
switch and control settings
Min
Max
8-9
7.838
8.162
7-8
6.858
7.142
6-7
5.878
6.122
5-6
4.898
5.102
4-5
3.918
4.082
3-4
2.938
3.062
2-3
1.958
2.042
1-2
0.978
1.022
b. Adjustments.
Adjust R138B (fig. 1) until true
rms voltmeter indicates 9.000 V
(R).
a. Performance Check
(1) Connect ∼ OUTPUT to differential voltmeter.
(2) Position controls as listed in (a) through (c) below:
(a) FREQUENCY Hz pushbuttons to indicate 1-0-0.
(b) MULTIPLIER 10 pushbutton pressed.
(c) RMS VOLTS switch to 9-10 and vernier control for a 9-V indication on
(3) Position FREQUENCY Hz and MULTIPLIER pushbuttons as indicated in
table 6. If
differential voltmeter does not
indicate within
limits specified, perform b below.
Test instrument
Differential voltmeter indication (V)
FREQUENCY Hz
MULTIPLIER
Min
Max
pushbuttons
pushbuttons
1-0-0
.1
8.973
9.027
1-0-0
1
8.9775
9.0225
1-0-0
100
8.9775
9.0225
1-0-01
10
9.00
9.00
1-0-0
1000
8.82
9.18
9-9-9
1000
8.82
9.18
1Substitute
true RMS voltmeter for differential voltmeter. Adjust RMS VOLTS vernier for a 9 V reference.
b. Adjustments
(2) Set RMS VOLTS vernier control fully ccw.
(3) Press FREQUENCY
Hz
pushbuttons
to
indicate
9-9-9
and
press
MULTIPLIER 1000 pushbutton.
(4) Adjust C132 (fig. 1) until true rms voltmeter indicates 9.00 V (R).