TB 9-6625-1098-24
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.
d. When indications specified in paragraphs 8 through 18 are not within tolerance,
perform the power supply check prior to making adjustments. After adjustments are made,
repeat paragraphs 8 through 18. 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 check where applicable.
a. Remove protective cover from TI as necessary for access to adjustments and test
points. Reinstall cover after completing check or adjustment.
b. Connect TI to a 115 V ac source.
c. Position TI switches as listed in (1) through (4) below:
(1) METER RANGE to 300 VOLTS
(2) HIGH PASS FILTER to OUT.
(3) NORM/RF DET to NORM (model 334A only).
(4) Power to ON and allow at least 20 minutes for TI to warm-up and stabilize.
d. Set power switch to OFF and perform mechanical zero on TI meter, using
mechanical zero adjustment screw located directly below meter.
e. Set power switch to ON.
