TB 9-6625-2168-24
to-one ratio between the standard and TI. Where the four-to-one ratio cannot be met, the
actual accuracy of the equipment selected is shown in parenthesis.
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. The following peculiar accessory is also required for this calibration:
DC power supply, Elgar, model DCS40-30EM10.
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
CALIBRATOR
Range:
0.99 to 5.0 A ac
Fluke, Model 5720A (5720A) (p/o
0.5%
MIS-35947); w amplifier, Fluke
Accuracy:
5725A/AR (5725A/AR)
Range:
12 to 125 V ac at 400 Hz
Guildline, Model 9711 (7912323)
DC CURRENT SHUNT
Range:
1.8 to 29 dc A
1
Accuracy:
Range:
18 mV to 36 V dc
Agilent, Model 3458A (3458A)
Accuracy: 0.5%
accuracy of DC current shunt and multimeter will not exceed 0.66%.
1Combined
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 table 2.
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 TM 11-6625-680-15 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.
7. Equipment Setup
a. Position controls as listed in (1) through (8) below:
