SECTION II EQUIPMENT REQUIREMENTS

TB 9-4920-359-35

Table 1. Calibration Description - Continued

Test instrument parameters

Performance specifications

Underfrequency circuit:

Low frequency

Range:

1095 Hz

±10 Hz

Accuracy:

High frequency

Range:

1155 Hz

±10 Hz

Accuracy:

SECTION II

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%

MULTIMETER

Range: 8 mV to 28 V dc;

Hewlett-Packard, Model 3458A

10 to 30.4 V ac

(3458A)

Accuracy: ±1% dc; ±0.33% ac

Frequency: 1085 to 1165 Hz

Accuracy: ±0.23%

RESISTANCE

Biddle-Gray, Model 71-631

Range: 1.1 to 3.3 kΩ

STANDARD

(7910328)

Accuracy: ±0.75%