MTS Axial Extensometers - Manual (Page 44)

Calibration 44
D. Prepare to use the calibration controls on your controller.
E. Adjust the excitation control to set the excitation to +6 V DC
or the voltage specified in the extensometer documentation.
2. Zero the conditioner output.
The arms of the extensometer must be in the zero reference
position. Depending on the extensometer, this can be accomplished
using the zero pin, stop block, or a special fixture.
Adjust the zero control to set the extensometer signal to 0.00 V
DC.
Note Several extensometers have asymmetrical outputs. This means
that the compression and tension outputs are not equal. Ensure
that you are aware of the maximum ratings of the extensometer
you are calibrating.
3. Adjust compression.
Because a true measurement is from the middle of each
extensometer arm, you must subtract the thickness of one of the
arms.
A. Remove the zero pin, fixture, or release the zero stop and
measure the extensometer arms as shown.
B. Adjust the caliper for a 80% compression displacement
(remember to subtract the thickness of one knife edge).
True
Measurement
m