TB 9-6625-2146-35
SECTION II
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set AN/GSM-287. 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 listed in table 2. The
accuracies listed in table 2 provide a four-to-one ratio between the standard and TI.
calibration technician.
Table 2. Minimum Specifications of Equipment Required
Minimum use
Manufacturer and model
Item
Common name
specifications
(part number)
A1
AC CALIBRATOR
Range: 0 to 773 V
Hewlett-Packard, Model
15 to 2500 Hz
745AOPTC93
(745AOPTC93)
0.125%
Accuracy:
w/HV amplifier C90-746A
(C90-746A)
A2
Range: 0 to 500 A
Holt, Model 250 (7912648)
CALIBRATOR
50 to 1000 Hz
Accuracy:
1
A3
DC CURRENT SHUNT
Range: 0 to 51 A
Guildline, Model 9711
Accuracy:
(7912323)
2
A4
DC POWER SUPPLY
Range: 0 to 30 A
NJE, Model CS36CR30D2
(7907346-2)
A5
DC POWER SUPPLY
Range: 30 to 51 A
Sorenson, Model 20-250
A6
DC VOLTAGE DIVIDER
Range: .001 to .01
ESI, Model RV722 (RV722)
Accuracy:
3
A7
DC VOLTAGE
Range: 0 to 1005 V
John Fluke, Model 332B/AF
STANDARD
(332B/AF)
0.062%
Accuracy:
3
A8
DECADE RESISTOR
Winslow, Model 336
Range: 0 to 10 k Ω
(7907234) or Clarostat,
Model 240C
A9
DIGITAL VOLTMETER
Range: Dc: 0 to 101 mV
Hewlett-Packard, Model
Ac: 0 to 1.05 V
3490AOPT060
Accuracy:
(3490AOPT060)
12
Dana, Model 5000, or Dana,
Model 5000 w/641
A10
PRECISION
Range: 0 to 125 V
Krohn-Hite, Model 4100AR-8
50 to 1000 Hz
(7915951) w/amplifier
7500 (7500)
1Combined
accuracy of (A2) and (A9) 0.125%.
2Combined
accuracy of (A3) and (A9) 0.062%.
3Combined accuracy of (A6) and (A7) 0.062%.
4
