TB 9-6625-2331-24
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set, AN/GSM-286; AN/GSM-287; or AN/GSM-440. 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 parentheses.
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.
Table 2. Minimum Specifications of Equipment Required.
Manufacturer and model
Common name
Minimum use specifications
(part number)
AUTOTRANSFORMER
Range: 105 to 125 V ac
General Radio, Type
W10MT3AS3 (7910809) or
Accuracy: 1%
Ridge, Model 9020A (9020A)
or Ridge, Model 9020F
(9020F)
CALIBRATOR
ACV: 1.414 to 6.372 V rms @ 100 kHz
Fluke, Model 5720A (5720A)
DCV: 4 to 40 V dc
(p/o MIS-35947)
Accuracy: 0.275%
FREQUENCY COUNTER
Range: 10 MHz
(AN/USM459B)
Resolution: ≥10 digits
Accuracy: N/A
FREQUENCY DIFFERENCE
Range: 10 MHz
Tracor, Model 527E
Resolution: 1 part in 10-10 per day
METER
Range: -5.15 to +12.1 V dc
Hewlett Packard, Model
3458A (3458A)
Accuracy: 0.2%
SIGNAL GENERATOR
Range: 1 MHz to 2 GHz
Aeroflex, Model 2023B
(2023B)
Amplitude: -27 to -11 dBm
Accuracy: 3%
TIME/FREQUENCY
Frequency: 10 MHz
Datum, Model ET6000-75
Accuracy: 1.25 parts in 10-10 per day
WORKSTATION
(13589305)
TUNABLE ACTIVE FILTER
50 kHz low pass
KrohnHite, Model 3940
(3940)
Cutoff frequency accuracy 2%
