TB 9-6625-2170-24
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 11-6625-3152-14 for this TI.
d. When indications specified in paragraphs 8 through 14 are not within tolerance,
perform the power supply check prior to making adjustments. After adjustments are made,
repeat paragraphs 8 through 14. Do not perform power supply check if all other
parameters are within tolerance.
e. Unless otherwise specified, all control 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 safety precautions.
REDUCE
OUTPUT(S) to minimum after each step within the
performance check where applicable.
a. Remove protective cover from TI only as necessary to make adjustments or gain
access to test points. Replace cover upon completion of test.
b. Press and release TI REAR INTFC/INPUT pushbutton to INPUT.
c. Connect TI to a 115 V ac source.
d. Set POWER switch to ON and allow at least 30 minutes for warm-up.
8. Common Mode Rejection
a. Performance Check
(1) Connect calibrator OUTPUT HI and LO to TI INPUT + and ground terminal.
(2) Connect TI INPUT to +.
(3) Connect TI FUNCTION OUTPUT to true rms voltmeter INPUT.
(4) Position controls as listed in (a) through (e) below:
(a) INPUT RANGE switch to 200 PV.
(b) FUNCTION VOLTS pushbutton pressed.
(c) FUNCTION LEVEL pushbutton pressed.
(d) RESPONSE RMS/AVG pushbutton pressed to RMS.
(e) All FILTERS pushbuttons released.
(5) Set calibrator for a 50 mV, 50 Hz output. True rms voltmeter indication
will be d 1.58 V.