TB 9-6625-128-24
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 four-to-one accuracy of the equipment selected is shown in parentheses.
5. Accessories Required. The accessories required for this calibration are common
calibration procedure.
Table 2. Minimum Specifications of Equipment Required.
Common name
Manufacturer and model
Minimum use specifications
(official nomenclature)
(part number)
Range: 1 kHz
Fluke, Model PM6681/656
COUNTER
Accuracy: 1.25 %
(PM6681/656)
Voltage output: 1 kHz square wave:
Fluke, Model 9500B/3200
CALIBRATOR
Range: 10 mV to 20 V ac
(9500B/3200)
Accuracy: 0.75 %
Time markers:
Range: 0.5 ns to 0.5 s
Accuracy: 0.75 %
Leveled sine wave:
Range: 0 to 600 mV p-p
Frequency: 50 kHz to 20 MHz
Accuracy: 5% of setting
referenced to 50 kHz
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.
Adjustments required to calibrate the TI are included in this procedure.
d. Unless otherwise specified, all controls and control settings refer to the TI.
