TB 9-6625-2133-24
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set AN/GSM-287 and 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. 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 accessory is also required for this calibration:
dc power supply, Sorenson, Model 20-250A (MIS-35935).
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
CALIBRATOR
Range: 0.5 to 2 V dc
Fluke, Model 5720A (5720A) (p/o MIS-
35947); w amplifier, Fluke 5725A/AR
Accuracy: .5%
(5725A/AR)
FREQUENCY COUNTER
Range: 47 to 57 MHz
Fluke, Model PM6681/656
Accuracy: .1%
(PM6681/656)
FUNCTION/ARBITRARY
Range: 5 to 455 kHz
Agilent, Model 33250A (33250A)
Range: 1 to 15 V dc
Agilent, Model 3458A (3458A)
Accuracy: .5%
A
Biddle-Gray, Model 71-631
RESISTANCE STANDARD
Range: 50 to 4900
(7910328)
ccuracy: .5%
SIGNAL GENERATOR
Range: 10 to 100 MHz
Aeroflex, Model 2023B (2023B) or (SG-
1207/U)
Accuracy: .4%
SPECTRUM ANALYZER
Range: 47 to 57 MHz
(AN/USM-677)
CALIBRATION PROCESS
6. Preliminary Instructions
a. The instructions outlined in paragraphs 6 and 7 are preparatory to the calibration
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.