TB 9-6625-1356-24
CALIBRATION PROCESS
6. Preliminary Instructions
a. The instructions outlined in paragraphs 6 and 7 are preparatory to the calibration
process Personnel should become familiar with the entire bulletin before beginning the
calibration.
b. Items of equipment used in this procedure are referenced within the text by common
name as listed in table 2.
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 this 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 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.
7. Equipment Setup
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 checks where applicable.
NOTE
Remove TI protective cover only to make connections or
adjustments. Reinstall protective cover immediately after
connection or adjustment.
a. Rotate AMPLITUDE controls fully ccw. Set LINE switch to off.
b. Set 115/230 slide switch (rear panel) to 115.
c. Connect autotransformer to TI.
d. Connect autotransformer to a 115 ac power source and adjust control for a 115 V ac output.
e. Set LINE switch to ON and allow sufficient time for warm-up and stabilization.
f. Set LINE switch to off (down) and wait 30 seconds.
g. (Hewlett-Packard, Model 651A) If necessary, turn meter mechanical zero
adjustment screw cw until meter pointer is on 0 (zero).