c. Unless otherwise specified, verify the result of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Adjustments required to calibrate the TI are included in the procedure. Additional
maintenance information is contained in the manufacturers' manuals for this TI.
d. When indications specified in paragraphs 8 through 13 are not within tolerance,
perform the power supply check (paragraph 14) prior to making adjustments. After
adjustments are made, repeat paragraphs 8 through 13. Do not perform power supply
check if all other parameters are within tolerance.
e. Unless otherwise specified all controls and control settings refer to the TI.
HIGH VOLTAGE is used or exposed during the performance of
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
OUTPUT(s) to minimum after each step within the
performance check where applicable.
a. Remove protective cover from TI only when necessary to make adjustments. Replace
cover after completing the adjustments.
b. Adjust mechanical zero adjustment on meter face for a 0 meter indication.
Remove shorting link from COMMON and ground terminals.
c. Connect TI to a 115 V ac source.
d. Position controls as listed in (1) through (4) below:
RANGE switch to 1.
Readout dials to 000000.
Polarity switch to + (positive).
NULL switch to .0001.
e. Set POWER switch to LINE OPR and allow a 5 minute warm-up period.
f. Short INPUT and COMMON terminals, then adjust electrical ZERO control for a 0
g. Remove short from INPUT and COMMON terminals.
8. Conventional Voltmeter Accuracy
a. Performance Check
(1) Set NULL switch to TVM.
(2) Connect calibrator OUTPUT to TI INPUT and COMMON terminals.