TB 9-6625-1998-35
c. Unless otherwise specified, verify the results 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 TMs 11-6625-681-14 and 11-6625-2725-14&P for
this TI.
perform the power supply check prior to making adjustments. After adjustments are made,
repeat paragraphs 8 through 11. 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
WARNING
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe the safety precautions. REDUCE
OUTPUT(S) to minimum after each step within the
performance check where applicable.
a. Set POWER switch to OFF.
b. If OUTPUT RMS (VOLTS RMS) meter does not indicate on mark or 0, adjust
screw located below meter face until meter indicates on mark or 0.
c. Connect TI to a 115 V ac power source.
d. Position controls as listed in (1) through (6) below:
(1) FREQ RANGE MULTIPLIER switch to X10.
(2) Frequency dial to 100.
(3) OUTPUT CONTROL fully ccw.
(4) ATTENUATOR switch to X10 V.
(5) FREQ METER switch to OFF (AN/URM-127 only).
(6) 1 kΩ LOAD switch to OUT (AN/ URM-127A only).
e. Set POWER switch to ON and allow at least 15 minutes for TI to reach operating
temperature.
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