SECTION III CALIBRATION PROCESS - TB-9-6625-2204-350004

TB 9-6625-2204-35

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 in tables 2 and 3.

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 11-6625-842-15 for this TI.

d. Unless otherwise specified, all controls and control settings refer to the TI.

7. Equipment Setup

WARNING

HIGH VOLTAGE is used or exposed during the performance of

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. Mechanically zero TI panel meters if required.

b. Set 6 AMP POWER circuit breaker to OFF and connect TI to 115 V ac, 400 Hz,

using cable W3 (P/0 TI).

c. Construct test loads as shown in figure 1A and B.

d. Using multimeter, measure resistance value of ac load (fig. 1A). If resistance value

exceeds 117.8 Ω, add 4700 Ω, resistor as shown in figure 1A.

e. Repeat d above for dc load (fig. 1B). If resistance value exceeds 4.l Ω, add 160 Ω

resistor as shown in figure 1B. If dc load is less than 3.9 Ω, add 0.1 Ω resistor as shown in

f. Connect one end of ac load (fig. 1A) to TRANSPONDER J2 pin C15 (fig. 2), using

appropriate lead. Connect other end of ac load to TRANSPONDER J2 pins C14 and C13

(fig. 2), using appropriate leads.