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
EQUIPMENT REQUIREMENTS
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
standard and TI.
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).
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%
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%
Range: 1.5 to 6 V p-p
(OS-303/G)
Accuracy: 3%
