TB 9-6625-2097-35
indicate 0 100 mV, perform b(3) below. Record digital voltmeter indication.
(8) Adjust ac calibrator frequency for 16.9492 ms.
Record digital voltmeter
indication.
(9) Subtract value recorded in (7) above from value recorded in (8) above. If the
difference is not between 4.975 and 5.025 V, perform b(4) through (7) below.
(10) Repeat technique of (7) through (9) above for DEVIATION RANGE switch
positions listed in table 4. Digital voltmeter will indicate within limits specified.
Table 4. Span Gain Accuracy
Test instrument
Digital voltmeter indications
DEVIATION RANGE
(V)
switch settings
Min
Max
1
-2.4875
-2.5125
2.5
-0.9950
-1.0050
5
-0.4975
-0.5025
51
-4.9700
-5.0300
10
-2.4850
-2.5150
25
-0.9925
-1.0075
50
-0.4970
-0.5030
1Adjust
ac calibrator frequency for 2.5641 ms. Set TI CENTER
FREQUENCY switch to 400 and DEVIATION RANGE switch to blue range.
b. Adjustments
(2) Adjust R-110 50 HZ (fig. 4) for 0.0 V indication on digital voltmeter (R).
(3) Adjust R-107 60 HZ (fig. 4) for 0.0 V indication on digital voltmeter (R).
(4) Set DEVIATION RANGE switch to 5.
(5) Adjust ac calibrator frequency for 18.1818 ms at 10 V and adjust R-107 60 HZ
(6) Adjust ac calibrator frequency for 15.3846 ms at 10 V and adjust R-143 SPAN
(7) Repeat (5) and (6) above to eliminate interaction.
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