TB 9-6625-2146-24
Table 1. Calibration Description - Continued
Test instrument
Manufacturer and model
Parameters
Performance specifications
Weston, Model 904
Ac volts
Range:
0 to 750 V
(horizontal position)
Accuracy: r0.5% of FS, 50 to 125 Hz
r1% of FS, 125 to 450 Hz
Ac amps
Range:
0 to 200 A, 25 to 500 Hz
Accuracy: r0.5% of FS
Weston, Model 931
Dc volts
Range:
0 to 750 V
(horizontal position)
Accuracy: r0.5% of FS
Dc amps
Range:
0 to 50 A
Accuracy: r0.5% of FS
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set AN/GSM-286, AN/GSM-287 and AN/GSM-705. Alternate items may be used
by the calibrating activity when the equipment listed in table 2 is not available. 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
standard and TI. Where the four-to-one ratio cannot be met, the actual accuracy of the
equipment selected is shown in parenthesis.
paragraph 4 above and are used in this calibration procedure. When necessary these items
may be substituted by equivalent items, unless specifically prohibited.
Table 2. Minimum Specifications of Equipment Required
Minimum use
Manufacturer and model
Common name
specifications
(part number)
CALIBRATOR
Range:
0 to 773 V
Fluke, Model 5720A (5720A)
15 to 2500 Hz
(p/o MIS-35947); w amplifier,
Fluke 5725A/AR (5725A/AR)
Accuracy: r0.125%
DC CURRENT SHUNT
Range:
0 to 51 A
Guildline, Model 9711
Accuracy: 0.01%
(7912323)
Range:
Dc: 0 to 101 mV
Agilent, Model 3458A (3458A)
Ac: 0 to 1.05 V
Accuracy: .005%
VOLTAGE STANDARD
Range:
High 0 to 200 Vac
Holt Instrument, Model 97717
Low 0 to 30 Vac
(97717)