TB 9-4920-463-24
CALIBRATION PROCESS FOR
VIBREX TESTER, MODELS 11 AND 11A
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 and
TM 55-4920-402-13&P.
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
OUTPUTS(S) to minimum after each step within the
performance check where applicable.
a. Screw magnetic pickup and two accelerometers into their respective holes on TI (fig. 1).
Do not connect any cables at this point.
NOTE
Screw the magnetic pickup in until it just touches the
interrupter screws. Then, back out the magnetic pickup 1/6
turn to provide clearance. Tighten jam nut on magnetic
pickup.
