TB 9-6625-2367-35
usage accessories, issued as indicated in paragraph 4 above, and are not listed in this
calibration procedure.
Manufacturer and model
Common name
Minimum use specifications
(part number)
FREQUENCY COUNTER
Range: 200 kHz to 3 MHz
Fluke, Model PM6681/656
(PM6681/656)
Accuracy: 50 ppm
TRUE RMS VOLTMETER
Frequency Range: 200-10,000 KHz
Fluke, Model 8922A/AA
Range: 1 Vrms
(8922A/AA)
Accuracy: ( 5%)
6. Preliminary Instructions
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 not 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.
a. Remove protective cover from TI only when necessary to make adjustments.
b. Ensure TI is fully charged before attempting performance checks.
8. Frequency Accuracy
a. Performance Check
f
(1) Connect frequency counter to TI's BNC connector using cable and 50
eedthrough termination.
