TB 9-6625-1999-35
CALIBRATION PROCESS FOR AN/GRM-50B (SG-479B/U)
18. Preliminary Instructions
process. Personnel should become familiar with Sections I, II, and IV 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.
perform the power supply check prior to making adjustments. After adjustments are made,
repeat paragraphs 20 through 28. 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.
19. 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.
NOTE
Remove TI protective covers only for access to connections and
adjustments. Reinstall covers immediately after connections or
adjustments.
ac output.
c. Set POWER switch to ON and allow at least 20 minutes for equipment to warm-up
and stabilize.
d. Set POWER switch to off (down) and wait 30 seconds.
e. If necessary, adjust mechanical adjust screws for a 0 indication on R.M.S. VOLTS
and PERCENT MODULATION meters.
f. Set POWER switch to ON and allow 1 hour for equipment to warm up and stabilize.
