TB 9-6625-1978-24
CALIBRATION PROCESS FOR
AUTOHET FREQUENCY COUNTER
EIP, MODEL 351D( )
Preliminary Instructions
a. The instructions outlined in paragraphs 11 and 12 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 the TI are included in this procedure. Additional
maintenance information is contained in the manufacturer's manual for this TI.
d. When indications specified in paragraphs 13 through 16 are not within tolerance,
perform the power supply check prior to making adjustments. After adjustments are made,
repeat paragraphs 13 through 16. Do not perform the power supply check if all other
parameters are within tolerance.
e. Unless otherwise specified, all controls and control settings refer to the TI.
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.
NOTE
If TI has been disconnected from line power for more than 24
hours, connect to 115 V ac source for at least 72 hours before
beginning calibration.
a. Remove TI protective cover.
b. Press POWER pushbutton to on and allow at least 1 hour for stabilization.