TB 9-6625-142-24
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set, AN/GSM-286; AN/GSM-287; and AN/GSM-440. 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 exceed the minimum use specifications listed in table 2. The accuracies listed
in table 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 parentheses.
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, Sorensen DCS40-30EM102.
Table 2. Minimum Specifications of Equipment Required.
Manufacturer and model
Common name
Minimum use specifications
(part number)
Fluke, Model 5720A (5720A) (p/o
CALIBRATOR
Dc voltage:
MIS-35947); w/ amplifier, Fluke
Range: 0 to 600 V dc
5725A/AR (5725A/AR)
Accuracy: 0.25%
Ac voltage:
Range: 0 to 600 V ac
Frequency: 45 Hz to 500 Hz
Accuracy: 0.375%
Dc current:
Range: 400 μA to 10 A
Accuracy: 0.375%
Ac current:
Range: 400 μA to 10 A
Accuracy: 0.5%
Range: 0 to 20 MΩ
Accuracy: 0.25%
Dc voltage:
Hewlett Packard, Model 3458A
Range: 0 to 9 V dc
(3458A)
Accuracy: 0.875%
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.