TB 9-6695-300-50
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
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.
Additional maintenance information is contained in the manufacturers' manuals for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
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.
b. Position tuning fork calibrator switches as listed in (1) through (4) below.
(1) WEIGHTING switch (A or C) to C.
(2) dB RANGE switch to LOW (30-100 db).
(3) FAST/SLOW RESPONSE switch to SLOW.
(4) RUN/HOLD/RESET switch to RUN.
NOTE
Set the RUN/HOLD/RESET switch in the RUN position to
measure the tuning fork frequency each time the tuning fork is
struck.
calibration, use the RESET position to clear the readings and
begin another measurement in the RUN position.