TB 9-4920-458-24
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
10
FREQUENCY DIFFERENCE Resolution: 5 parts in 10
Tracor, Model 527E (527E)
METER
Datum, Model ET6000-75
TIME/FREQUENCY
Range: 10 MHz
10
(13589305)
WORKSTATION
Accuracy: 5 parts in 10
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 manufacturer's manual for this TI.
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. Connect TI to 115 V ac source and verify POWER ON indicator is illuminated.
b. Allow at least 1 hour for warm-up and verify OPERATION indicator is illuminated.
8. Frequency Accuracy
a. Performance Check
(1) Connect time/frequency workstation 1 MHz output to frequency difference meter
REF INPUT.
(2) Connect TI 10 MHz OUTPUT J1 0.5-0.7 VRMS 50 connector (rear panel) to
frequency difference meter SIG INPUT using a 50 feedthrough termination.
