TB 9-6625-2121-24
5. Accessories Required. The accessories required for this calibration are common
usage accessories, issued as indicated in paragraph 4 above, and are not listed in this
calibration procedure.
Table 2. Minimum Specifications of Equipment Required
Minimum use
Manufacturer and model
Common name
specifications
(part number)
Guildline, Model 9711
DC CURRENT SHUNT
Range: 0 to .00001 A
1
(7912323)
Accuracy:
Range: 0 to 5 A
DC POWER SUPPLY
Kepco, Model HB525
(7915935)
Winslow, Model 336 (7907234) or
DECADE RESISTOR
Range: 0 to 5000
Clarostat, Model 240C (240C)
Range: 0 to 10,240 V dc Agilent, Model 3458A (3458A)
0.5%
Accuracy:1
accuracy of A1 and A4 is 0.5% for dc current.
1Combined
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
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. Unless otherwise specified, all controls and control settings refer to the TI.
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 if adjustments are required.
b. Mechanically adjust TI zero adjust screws for 0 indication on dc KV and dc A meters.