SECTION II EQUIPMENT REQUIREMENTS

TB 9-4920-361-24

Table 1. Calibration Description - continued

Test instrument parameters

Performance specifications

MODEL 476-854 - continued

Inter cal(unit tester):

Positions 1 to 14

Range: 5 V dc

Accuracy: ±1 V dc

Positions 15 to 19

Range: 5 V dc

Accuracy: ±0.5 V dc

Rotor overspeed (unit tester)

Range: 5 V dc

Accuracy: ±0.5 V dc

Central display and signal data (unit tester) See paragraph 21

Display update (unit tester)

See paragraph 22

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 Set AN/GSM-286, AN/GSM-287 or 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

listed in table 2. The accuracies listed in table 2 provide a four-to-one ratio between the

standard and TI.

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: Extender Board, Canadian Marconi P/N 220-419916-000 and DC Power Supply,

Elgar, Model DCS40-30EM1-2 (13589313).

Table 2. Minimum Specifications of Equipment Required

Manufacturer and model

Common name

Minimum use specifications

(part number)

AUTOTRANSFORMER

Range: 105 to 125 V ac at 400 Hz

Ridge, Model 9020A (9020A)

Accuracy: ±1%

CALIBRATOR

Range: 6 V at 400 Hz

Fluke, Model 5720A (5700A/EP)

(p/o MIS-35947)

Accuracy: ±1%

FREQUENCY COUNTER

Range: 600 ms to 18.0 kHz

Fluke, Model PM6681/656

(PM6681/656)

Accuracy: ±0.002%

MULTIMETER

Range: -11 to +28 V dc, 1.32 to

Hewlett-Packard, Model 3458A

12.5 V ac

(3458A)

Accuracy: ±0.02% dc, ±1% ac

Range: 71 to 270Ω (4-wire)

Accuracy: ±0.05%

OSCILLOSCOPE

Range: 1.5 to 6 V p-p

(OS-303/G)

Accuracy: ±3%