TB 9-6625-2307-24
Table 2. Minimum Specifications of Equipment Required
Minimum use
Manufacturer and model
Common name
specifications
(part number)
FREQUENCY COUNTER
Range: 12 MHz
Fluke, Model PM6681/656
Accuracy: 1.25 ppm
(PM6681/656)
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 results of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Adjustments required to calibrate TI are included in this procedure.
Additional
maintenance information is contained in TM 11-6625-3264-40.
d. Unless otherwise specified, all controls and control settings refer to the TI.
7. Equipment Setup
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. Replace
cover after completing the adjustments.
b. Ensure rear panel voltage select card is set for 115 V ac.
Connect TI to an
appropriate 115 V ac source.
c. Set POWER switch to ON. Allow approximately 10 minutes warm-up period.
8. Oscillator
a. Performance Check
(1) Initialize TI by performing (a) through (c) below:
(a) Press MENU key to select AUXILIARY.
