TB 9-6625-2221-24
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set, AN/GSM-286; AN/GSM-287; or AN/GSM-705. Alternate items may be used
by the calibrating activity. The items selected must be verified to perform satisfactorily
prior to use and must bear evidence of current calibration. The equipment must meet or
2 provide a four-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.
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
Fluke, Model 5720A (5720A) (p/o
CALIBRATOR
Range: 0 to 3.46 V ac
MIS-35947); w amplifier, Fluke
Accuracy:
r 0.125%
1
5725A/AR (5725A/AR)
Frequency: 20 Hz to 110 kHz
Range: 48 V dc
Accuracy:
r 3%
DC CURRENT
Range: 0.1 A
Guildline, Model 9711
Accuracy:1
SHUNT
(7912323)
Range: 0 to 60 mV dc
Agilent, Model 3458A (3458A)
Accuracy:1
Range: 20.0 Hz to 110 kHz
Fluke, Model PM6681/656
COUNTER
(PM6681/656)
Accuracy:
r 0.002%
1Combined
accuracy 1.25 %.
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.
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 procedure 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. Unless otherwise specified, all controls and control settings refer to the TI.