TB 9-4920-359-35
Table 1. Calibration Description - Continued
Test instrument parameters
Performance specifications
Underfrequency circuit:
Range:
1095 Hz
10 Hz
Accuracy:
Range:
1155 Hz
10 Hz
Accuracy:
EQUIPMENT REQUIREMENTS
4. Equipment
Required. Table 2
identifies the
specific equipment to be
used in this
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Sets 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 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 parenthesis.
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 accessories are also required for this
calibration: Power Supply, Sorensen Model DCS 40-30; and Power Amplifier, CPD
Engineering Model 97717.
Table 2. Minimum Specifications of
Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
CALIBRATOR
Range: 1 V ac
Fluke, Model 5720A (5700A/EP)
at 396 to 1200 Hz
(p/o MIS-35947); w amplifier,
30 V dc
Fluke 5725A/AR (5725A/AR)
Accuracy:
ac 0.4%, dc 1.0%
Freq Accuracy: 0.25%
Range: 0 to 5 A dc
Accuracy: 0.05 A dc
FREQUENCY
Range: 100 ms to 5.5 s;
Fluke, Model PM6681/656
COUNTER
(PM6681/656)
Accuracy: 0.02%
Range: 8 mV to 28 V dc;
Hewlett-Packard, Model 3458A
10 to 30.4 V ac
(3458A)
Accuracy: 1% dc; 0.33% ac
Accuracy: 0.23%
Biddle-Gray, Model 71-631
Range: 1.1 to 3.3 kΩ
STANDARD
(7910328)
Accuracy: 0.75%