TB 9-6695-288-35
7. Equipment Setup
WARNING
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUT(S) to minimum after each step within the
performance check where applicable.
a. Remove protective cover from TI as necessary for access to adjustments.
b. Connect TI to autotransformer.
d. Position controls as indicated in (1) through (7) below:
(1) FUNCTION switch to INPUT LEVEL.
(2) METER RESPONSE switch to VU.
(3) FILTERS pushbuttons to OFF (out).
(4) INPUT RANGE control to .001 V (.1 mV for OPT001).
(5) FREQUENCY switches to 1.0 x 10.
(6) INPUT/GND SELECT switch to DIS.AN./⊥ (center position).
(7) LINE switch to ON and allow at least 20 minutes for warm-up.
e. Set LINE switch to OFF. Wait 30 seconds and verify an exact zero indication on TI
meter and adjust as necessary. Set LINE switch to ON.
8. Voltmeter Accuracy
a. Performance Check
(1) Connect calibrator output to ratio transformer input and ratio transformer
output to TI DISTORTION ANALYZER input.
(2) Adjust ratio transformer controls for 0.001 ratio.
(3) Adjust calibrator frequency for 10 Hz and output for a full-scale indication on TI
meter. If calibrator does not indicate between 0.96 and 1.04 V (.096 and .104 V OPT001),
perform b below.
(4) Repeat technique of (3) above at settings and indications listed in table 4. If
calibrator does not indicate within limits specified, perform b below.
