TB 9 6625-357-24
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 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
Ridge, Model 9020A (9020A),
Accuracy: 1%
FREQUENCY COUNTER
Range: 20 Hz to 3 MHz
Fluke, Model PM6681/656
(PM6681/656)
Accuracy: 0.75%
FUNCTION GENERATOR Range: 20 Hz to 3 MHz
Agilent, Model 33250A (33250A)
Accuracy: 0.01%
Range: 0 to 0.1 V dc
Fluke, Model 8840A/AF05
(AN/GSM-64D)
Accuracy: 0.01%
Range: 0 to 1.06 V ac, 240 to 360 V dc
Accuracy: 1%
TRUE RMS VOLTMETER
Range: 0 to 2 Vac, 20 Hz to 2 MHz
Fluke, Model 8922A/AA
Accuracy: ( 3%)
(8922A/AA)
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 applicable sections 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.
d. Unless otherwise specified, all controls and control settings refer to the TI.
7. Equipment Setup
WARNING
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUT(S) to minimum after each step within the
performance check where applicable.