TB 9-4931-541-40
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.
d. Unless otherwise specified, all controls and control settings refer to the TI.
7. Equipment Setup
a. Clean TI contact surface and electronic linear transducer probe tip with alcohol.
b. Position TI contact surface to lowest position.
c. Mount standard electronic linear transducer in TI dial indicator mounting fixture using shaft
diameter adapter so probe tip just makes contact with TI contact surface.
d. Connect the electronic linear transducer to the ND281B display unit and connect
display unit to 110 V ac.
e. Set both TI and standard electronic linear transducer display units for a 0.000001
resolution.
NOTE
Zero electronic linear transducer display unit. Ensure the
electronic linear transducer and TI has full 1 in. travel.
f. Allow 1 hour equipment stabilization time.
8. Dial Indicator Calibrator (DIC) Linearity Accuracy
a. Performance Check
(1) Zero both the TI and standard electronic linear transducer display units.
(3) Verify that the standard display unit displays within limits in table 3.
(4) Repeat technique of (2) and (3) for all remaining TI settings listed in table 3.
(5) Zero both the TI and standard electronic linear transducer display units.
(6) Repeat technique of (2) through (4) above for the TI contact surface downward
direction.
