TB 9-6625-1973-24
(6) Repeat technique of (5) above using values in table 4. If calibrator indications
are not within limits specified, perform indicated adjustment, using the technique of b (2)
through (5) below.
Table 4. DVM Accuracy and Tracking
Calibrator
Test instrument
indications (V dc)
Adjustments
RANGE
switch
Indication
Min
Max
10
2.0000
1.9971
2.0029
3.0000
2.9967
3.0033
4.0000
3.9963
4.0037
5.0000
4.9959
5.0041
6.0000
5.9955
6.0045
7.0000
6.9951
7.0049
8.0000
7.9947
8.0053
9.0000
8.9943
9.0057
10.0000
9.9939
10.0061
- 10.0000
- 9.9939
-10.0061
A13R15 (R)
A12R21 (R)1
100
- 100.0000
- 99.939
-100.061
A12R21 (R)1
100
+100.0000
99.939
100.061
CAUTION
Do not reverse polarity of 1000 V input.
1000
+1000.00
998.99
1001.01
A12R24 (R)
1Adjust
for best in-tolerance between + 100 and -100 V indication.
b. Adjustments
(1) Adjust A12R31 (fig. 1) for a .0000 V indication on TI (R).
(2) Adjust calibrator output for +10.0000 V.
(3) Adjust A13Rl6 (fig. 1) for a +10.0000 V ( 2 counts) indication on TI (R).
(4) Reverse polarity of input signal to TI.
(5) Adjust A13R15 (fig. 1) for a -10.0000 ( 2 counts) indication on TI (R).
14. Power Supply
NOTE
Do not perform power supply checks if all other parameters are
within tolerance.
a. Performance Check
(1) Connect multimeter (A3) to pin 7 of A15 (fig. 1). If multimeter does not indicate
between 16 and 17 V, perform b (1) below.
(2) Connect multimeter to pin 6 of A15 (fig. 1). If multimeter does not indicate
between -16 and -17 V, perform b (2) below.
