TB 9-6625-162-24
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set, AN/GSM-286; AN/GSM-287; or 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
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 4 above, and are not listed in this calibration
procedure. The following peculiar accessory is also required for this calibration: Clarke
Hess model 875, 15-turn current coil.
Table 2. Minimum Specifications of Equipment Required.
Manufacturer and model
Common name
Minimum use specifications
(part number)
Dc Current
Clarke Hess, Model 8100-01-02
CALIBRATOR
Range: 0-100 A
(8100-01-02)
Accuracy: Dc A 0.375%
Ac Current
Range: 0-100 A
Frequency: 50 Hz to 400 Hz
Accuracy: Ac A 0.375%
CALIBRATOR
Dc voltage:
Fluke, Model 5720A (5720A) (p/o
Range: 0 to 600 V
MIS-35947); w/ amplifier, Fluke
Accuracy: 0.25%
5725A/AR (5725A/AR)
Ac voltage
Range: 0 to 600 V
Frequency: 10 Hz to 400 Hz
Accuracy: 0.375%
Frequency
Range: 0-4 kHz
Accuracy: 0.375%
IET Labs, HARS-LX-9-0.001
Range: 0-4 kΩ
STANDARD
(HARS-LX-9-0.001)
Accuracy: 0.375%
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.
