TB 9-6625-2218-24
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set AN/GSM-286, AN/GSM-287, AN/GSM-705 and Secondary Reference
Calibration Set 4931-00-621-7878. 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 listed in table 2. The
accuracies listed in table 2 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.
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 the
procedure. The following peculiar accessories are also required for this calibration:
EXTENDER, Sampling head extension, 012-0125-00 and Power Supply Tektronix, Types
285 or 286.
Table 2. Minimum Specifications of Equipment Required
Minimum use
Manufacturer and model
Common name
specifications
(part number)
Range: 80 ns to 9.1 μs
FREQUENCY COUNTER
Fluke, Model PM6681/656
1.5%
(PM6681/656)
Accuracy:
1
OSCILLOSCOPE
Range: 2 to 6 ns
(OS-303/G)
Risetime capability: (<350 ps)
Tektronix, Type 7613 w/7S114,
Range: 2 to 6 ns
Risetime capability: (<25 ps)3
7T11, and S4 (MIS-35808)
1Required
only at transfer level.
2Either
oscilloscope or power supply must be supplied with TI at transfer level.
3Risetime of <25 ps required at reference level.
4Two 7S11 required at reference level.
CALIBRATION PROCESS (REFERENCE ONLY)
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. Additional
maintenance information is contained in the manufacturer's manual for this TI.
