TB 9-6625-143-24
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set, AN/GSM-286; AN/GSM-287; and 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 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 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 the
calibration procedure.
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
Range:
-5.250 V dc to 17.010 V dc
Hewlett Packard, Model 3458A
Accuracy:
0.005%
(3458A)
Range:
7 mV to 35 V dc
Fluke, Model 5820A-5C-GHZ
CALIBRATOR
Accuracy:
0.69% of setting
(5820A-5C-GHZ)
Range:
50 kHz to 100 MHz
Accuracy: 5% of reference @ 50 kHz
Range:
10 ns to 100 ms
Accuracy:
0.053% of setting
POWER SPLITTER
Range:
25 MHz to 100 MHz
Weinschel, Model 1870A (7916839)
Accuracy:
Outputs differ < 0.15 dB
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. Additional
maintenance information is contained in the manufacturers' manuals for this TI.