TB 9-4920-361-24
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
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 TM 55-4920-412-13&P for model 476-854 and TM
55-4920-413-13&P for model 476-853.
d. When indications specified in paragraphs 8 through 22 are not within tolerance,
perform the power supply check prior to making adjustments. After adjustments are made,
repeat paragraphs 8 through 22. 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.
f. Perform paragraphs 8 through 18, 23, and 24 for model 476-853 and paragraphs 8
through 24 for model 476-854.
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. If calibrating TI model 476-854, do not connect unit tester to simulator unit until
instructed to do so.
b. Set ON-OFF-SIM ONLY switch to OFF.