TB 9-6625-2194-35
d. Set RANGE switch to 1000 VOLTS.
e. Adjust TI mechanical zero adjustment screw to obtain 0 indication on TI meter.
f. Set RANGE switch to 10 and OPR/ZERO switch to ZERO.
g. Adjust ZERO control to obtain 0 indication on TI meter.
h. Set RANGE switch to 3 and repeat 1 above.
i. Set OPR/ZERO switch to OPR.
j.
Repeat f through i above and k below, until no further adjustment is required.
k. Set RANGE switch to 1000 VOLTS.
a. Performance Check
(1) Connect calibrator OUTPUT to dc voltage divider INPUT and then connect dc
voltage divider OUTPUT to TI INPUT and COMMON terminals.
(2) Set calibrator output to 0 V.
(3) Set dc voltage divider dials to .0000000 and repeat 7 f through i and k above.
(4) Set dc voltage divider dials to .0001000.
(5) Set calibrator output to 0.010000.
(6) Set RANGE switch to 1.
(7) Adjust calibrator output to obtain a full-scale indication on TI meter. If
calibrator does not indicate between 0.0088 and 0.0112 V (0.0087 and 0.0113 for model
845AR), perform b below.
(8) Repeat technique of (4) through (7) above, using values listed in table 3.
Calibrator will indicate within limits specified.
(9) Reverse leads to TI and repeat (2) through (8) above.
b. Adjustments
(1) Set RANGE switch to 10.
(2) Connect calibrator to TI INPUT and COMMON terminals.
(3) Adjust calibrator dials to 10.000000.
(4) Adjust R151 (R213 for model 845AR) (fig. 1) to obtain full-scale (+10) deflection
on TI meter (R).
