TB 9-4931-383-50
(4) Adjust voltage divider for a null indication on null detector (A4) (within 10
microvolts). Record null detector indication.
(5) Set TI voltage dials to 010.0000.
(6) If null detector indication is not within 1 microvolt of value recorded in (4)
above, perform b(1) and (2) below.
(7) Repeat the technique of (1) through (6) above, using settings, indications, and
Table 4. Linearity
Test Instrument Switch
Settings.
Voltage
Maximum
Voltage Dial
Divider
Dc Transfer
Difference
Voltage
Step (3)
Initial
Standard
Allowed
Adjustments
Range
Step (5)
Setting.
Output.
(V) 1
(B)
1000
01X.0000
020.0000
.5000000
10-volt
10
R908 (R)
mean
1000
03X.0000
040.0000
.2500000
10-volt
10
R909 (R)
mean
1000
05X.0000
060.0000
.1666666
10-volt
20
R910 (R)
mean
1000
07X.0000
080.0000
.1250000
10-volt
20
R911 (R)
mean
1000
09X.0000
0X0.0000
.1000000
1-volt mean
20
R912 (R)
100
0X.00000
10.00000
.1000000
10-volt
1
R901 (R)3
mean
100
1X.00000
20.00000
.5000000
10-volt
10
R902 (R)
mean
100
3X.00000
40.00000
.2500000
10-volt
10
R903 (R)
mean
100
5X.00000
60.00000
.1666666
10-volt
20
R904 (R)
mean
100
7X.00000
80.00000
.1250000
10-volt
20
R905 (R)
mean
100
9X.00000
100.00000
.1000000
10-volt
20
R906 (R)
mean
1If
difference exceeds this value, perform adjustment.
2Report adjustments only if difference is greater than 100 microvolts.
3Report this adjustment if difference is greater than 30 microvolts.
(8) Set POWER switch to STANDBY/RESET.
b. Adjustments
WARNING
Dangerous potentials exist between chassis and ground.
Exercise extreme caution.
(1) Adjust R907 (fig. 3) for same indication on null detector (R). (Report only if
difference is greater than 30 microvolts.)
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