TB 9-5120-202-24
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 3.
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 these TIs.
d. Unless otherwise specified, all controls and control settings refer to the TI.
7. Equipment Setup
a. Remove TI from case.
b. Visually check TI for bent or damaged pointers or needles. Pointers or needles must
have freedom of movement during torque.
c. Remove any dirt or grime that may have accumulated around the trigger or ratchet
mechanism by using a stiff, clean brush and wiping with clean rag.
d. Visually check square drive for roundness of corners.
e. Check head and yoke for looseness from measuring element.
f. Secure holding fixture or torque adapter to a stable, rigid work surface.
g. Zero TI if applicable.
NOTE
This procedure normally covers calibration in the clockwise
direction. A counterclockwise calibration can be accomplished
by reversing directions outlined in each performance check. It
will be necessary to torque the torque cell full-scale three
times, in the direction of intended operation, prior to
calibration. Torque wrenches will be calibrated by applying
increasing torque only in the clockwise direction, unless
counterclockwise direction is specifically requested by
owner/user.
