TB 9-6625-2020-24
CALIBRATION PROCESS FOR TYPE DM 502A
14. Preliminary Instructions
a. The instructions outlined in paragraphs 14 and 15 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 the manufacturer's manual for this TI.
d. When indications specified in paragraphs 16 through 20 are not within tolerance,
perform the power supply check prior to making adjustments. After adjustments are made,
repeat paragraphs 16 through 20. Do not perform power supply check if all other
parameters are within tolerance.
15. 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 TI protective cover as required.
b. Connect TI to power module using extender.
c. Connect power module to a 115 V ac source.
d. Release TI INPUT INT/EXT pushbutton to EXT.
e. Pull power module PWR switch to on and allow at least 30 minutes for warm-up.
16. Dc Volts
a. Performance Check
and LOW.
(1) Connect calibrator OUTPUT HI and LO to TI VOLTS/
(2) Press TI VOLTS DC pushbutton.
(3) Press TI range pushbuttons and set calibrator output to settings listed in table 8.
If TI does not indicate within limits specified, perform b below.