TB 9-4920-359-24
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 manufacturer's manual for this TI.
d. 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 check where applicable.
a. Set all TI switches to down or OFF position.
b. Adjust all meters for mechanical zero or lowest pointer reading.
c. Connect equipment as shown in figure 1.
d. Pull 400
GEN-T1, T2, and T3 circuit breakers to out position.
e. Set GEN/PMG VOLTS switch to T1.
f. Set power amplifier OUTPUT VOLTAGE RANGE switch to 200 V and adjust
POWER AMPLIFIER GAIN control fully ccw.
NOTE
Input voltage source (calibrator) for the power amplifier must
be set to 1 Vrms as shown in green area of Regulation Range
Meter of power amplifier plug-in module. Calibrator EX SENS
must always be activated for input into power amplifier. Input
frequency can be adjusted as required for desired power
amplifier frequency output.
g. Set calibrator to 1 V, 400 Hz and press EX SENS. Set calibrator to OPR.