ATS 2140-M Series, Instruction Manual

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Details of both calibration and verification are defined during the Frame Setup Process (see Section
6.2.10). To initiate extensometer calibration:
a. Select Calibrate from the Extensometer pull-down under the Calibration menu.
b. Select the appropriate frame from the pull-down menu and click OK.
NOTE: At this point, the main menu and status display screen will be displayed, and the status display
line corresponding to the selected frame will turn red. “Cal/Ver” will be displayed in the alarm column.
c. For the Classic tester, use the buttons located below the LCD display on the Control console
to proceed, as directed by the instructions on the LCD display. For Modular testers, use the
LCD display on the Portable Display Module.
d. The LCD display will move through a series of steps requiring moving of the LVDT in precise
increments given by a micrometer calibration device.
e. When the process is completed, the status display screen will return to normal.
f. To review the calibration report and graph, select View Calibration Report from the
Extensometers pull-down on the Calibration menu.
g. Choose the appropriate extensometer and click OK. The selected report will appear.
NOTE: This report will provide all pertinent data on the calibration, including a grading (gradation
comparison) against ASTM standards. In almost all cases, the data will indicate a class A extensometer,
though this does NOT guarantee that the extensometer will perform as a class A.
8.2.5.2 Verification
In order to know how the extensometer will perform in actual operation, repeat the above process,
selecting Verify from the Extensometer pull-down on the Calibration menu instead of Calibrate. After
completing the verification process, the resulting verification report will show the true capability of the
extensometer.
In practice, it is normal to perform the calibration process at the interval specified in the setup field, and
to perform verification much more frequently.