SECTION III CALIBRATION PROCESS

TB 9-4920-361-24

SECTION III

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 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.

7. Equipment Setup

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.

c. Connect equipment as shown in figure 1.