TB 9-4931-287-40
NOTE
Repeat (3) above as necessary during the remainder of the
procedure to assure stability of TI. Instability is often caused
by internal batteries and/or standard cell and should be
corrected before proceeding with the calibration.
(4) Connect equipment as shown in figure 1, connection A.
(5) Turn FUNCTION switch to COMP SET and COMP switch to ON. Adjust
COMP control for null indication on TI galvanometer. Turn COMP switch to OFF.
(6) Turn FUNCTION switch to OUTPUT X1. Null detector will be between 0 and 20 V.
(7) Connect equipment as shown in figure 1, connection B.
(8) Repeat (5) above.
(9) Set dc voltage divider controls to .1000000.
(10) Adjust output of calibrator to 0.10000 V and set MILLIVOLT switch to 10.
(11) Readjust calibrator to obtain best null on null detector. Calibrator will indicate
between 0.09975 and 0.10025 V.
(12) Repeat technique of (10) and (11) above, using values listed in table 4.
Calibrator output will be within limits specified.
Table 4. Output Accuracy
Test instrument
Calibrator
MILLIVOLT
MILLIVOLT
Final setting (V)
Initial
switch setting
control setting
setting (V)
Min
Max
20
0
0.2
0.19970
0.20030
30
0
0.3
0.29965
0.30035
40
0
0.4
0.39960
0.40040
50
0
0.5
0.49955
0.50045
60
0
0.6
0.59950
0.60050
70
0
0.7
0.69945
0.70055
80
0
0.8
0.79940
0.80060
90
0
0.9
0.89935
0.90065
1
100
0
1.0
0.99930
1.00070
2
1.02
1.01929
1.02071
4
1.04
1.03928
1.04072
6
1.06
1.05927
1.06073
8
1.08
1.07926
1.08074
10
1.10
1.09925
1.10075
11
1.11
1.10924
1.11076
1Do
not change MILLIVOLT switch setting.
(13) Adjust output of calibrator to 0.111 V and set TI FUNCTION switch to
OUTPUT X.1.
(14) Readjust calibrator to obtain best null-on-null detector. Calibrator output will
be between 0.11089 and 0.11111 V.
b.
Adjustments. No adjustments can be made.
7
