TB 9-6625-127-24
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 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)
AUDIO ANALYZER
Range: 10 Hz to 100 kHz
Boonton, Model 1121
Accuracy: 0.1% of range
(1121)
FREQUENCY COUNTER Range: Frequency, 1 to 50 MHz
Fluke, Model PM6681/656
Time Interval, 10 ns to 9999 ms
(PM6681/656)
Accuracy: 0.001%
Range: 2 kHz, 4.5 V
Agilent, Model 33250A (33250A)
FUNCTION
Accuracy: N/A1
Range: V rms, 20 mV to 4.5 V @ 1 kHz
Hewlett Packard, Model 3458A
DC V, 50 mV to 8 V
(3458A)
Accuracy: 0.25%
Range: 1.6 V p-p, BW 200 MHz
Agilent, OS-303/G (OS-303/G)
Accuracy: Risetime <1.75 ns
Amplitude 2% FS
Range: 600 kHz to 50 MHz
(AN/USM-677)
SPECTRUM ANALYZER
Accuracy: 1 dB
Used for adjustment only.
1
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.
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.