TB 9-6625-1314-24
16. Dc Volts and Stability
a. Performance Check
(1) Connect calibrator HI and LO outputs to TI VOLT and COM terminals.
(2) Adjust output of calibrator to obtain an indication of +199.9 on TI. If calibrator
does not indicate between 199.3 mV and 200.5 mV, perform b (1) and b (2) below.
(3) Adjust calibrator output to obtain an indication of -199.9 on the TI. If calibrator
does not indicate between -199.3 mV and -200.5 mV, perform b (1) and b (3) below.
(4) Press 2 range pushbutton.
(5) Adjust output of calibrator to obtain an indication of +1.999 on TI. If calibrator
does not indicate between 1.995 V and 2.003 V, perform b (4) and b (5) below.
(6) Adjust autotransformer from 105 to 125 V while repeating (5) above.
(7) Adjust autotransformer to 115 V.
(8) Press TI range pushbuttons as listed in table 7 and adjust calibrator output for
corresponding indications. Calibrator indications will be within limits in table 7.
Table 7. Dc Volts Range and Tracking
Calibrator
Test instrument
indications V
Range pushbutton
Indication
Min
Max
20
19.99
19.950
V
20.030
V
20
18.88
18.841
V
18.919
V
20
17.77
17.732
V
17.808
V
20
16.66
16.623
V
16.697
V
20
15.55
15.514
V
15.586
V
20
14.44
14.405
V
14.474
V
20
13.33
13.296
V
13.363
V
20
12.22
12.187
V
12.252
V
20
11.11
11.078
V
11.141
V
200
199.9
199.5
V
200.3
V
2000
999
994
V
1004
V
b. Adjustments
NOTE
Only need to perform the following steps (adjustments) on the
ranges which are out of tolerance. If performing all of the
adjustments, press the correct range pushbutton prior to
applying the calibrator output.
(1) Adjust calibrator for an output of 199.90 mV.
(2) Adjust FS (+.2 VDC) (fig. 3) to obtain an indication of +199.9 on TI.
(3) (Calibrator output to 199.9 mV). Adjust NEG FS (-.2VDC) (fig. 3) to obtain an
indication of -199.9 on TI.