TB 9-6625-2146-24
Table 3. Accessories Required
Common name
Description (part number)
DC POWER SUPPLY NO. 1
Elgar, Model DCS40-30EM10
(13589313)
DC POWER SUPPLY NO. 2
Sorenson, Model 20-250A (MIS-35935)
DECADE RESISTOR
Winslow, Model 336 (7907234) or Clarostat, Model
240C (240C)
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 as listed 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 each TI are included in this procedure. Additional
maintenance information is contained in the manufacturer's manual for each TI.
d. This is a general procedure which provides instructions for the calibration of any
instrument within the series. Each instrument requires a check for meter tracking and
linearity on one range and full-scale accuracy on the remaining ranges.
e. Unless otherwise specified, all controls and control settings refer to the TI.
7. Equipment Setup
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. Place TI in horizontal position for calibration.
b. Adjust meter mechanical zero adjustment for zero meter indication if required.