TB 9-4935-367-35
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Sets AN/GSM-286; 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
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.
usage accessories, issued as indicated in paragraph 4 above, and are not listed in the
calibration procedure. The following peculiar accessory is also required for this calibration:
voltage divider, 600 Ω double banana plug to triple banana jack, Hewlett-Packard Model
11047A (7911560).
Manufacturer and model
Common name
Minimum use specifications
(part number)
AUDIO ANALYZER
Range: 40 Hz to 600 kHz
Boonton, Model 1121 (1121)
Capability: < 0.3%
AUTOTRANSFORMER
Range: 105 to 125 V ac
General Radio, Model W10MT3AS3
(7910809) or Ridge, Model 9020A
Accuracy: 1%
(9020A), or Ridge, Model 9020F
(9020F)
FREQUENCY COUNTER
Range: 49.75 mS to 1,001,900 Hz
Fluke, Model PM6681/656
Accuracy: 0.05%
(PM6681/656)
Range: -35.5 to -36.5 V dc
Fluke, Model 8840A/AF05
(AN/GSM-64D)
Accuracy: 0.35%
TRUE RMS VOLTMETER
Range: 1.80 to 20.6 V ac
Fluke, Model 8922A/AA
(8922A/AA)
Accuracy: 0.5%
6. Preliminary Instructions
process. Personnel should become familiar with the entire bulletin before beginning the
calibration.
b. Items of equipment used in this procedure are referenced within the text by common
name as listed in table 2.
c. Unless otherwise specified, verify the result of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Adjustments required to calibrate the TI are included in this procedure. Additional
maintenance information is contained in the manufacturer's manual for this TI.