MTS Axial Extensometers - Manual (Page 47)

Calibration 47
A. Remove the zero pin, fixture, or release the zero stop and
install the extensometer on the calibration block so that the
extensometer arms are in the grooves that represent about
80% compression displacement.
B. Adjust the gain control to set the extensometer signal to -8 V
DC (or 80% of your calculated output).
4. Readjust the zero and compression.
Repeat Step 2 and Step 3 until the zero and gain outputs can be
measured without readjustment.
5. Adjust tension.
Remove the extensometer from the calibration block and reinstall it
so arms of the extensometer are in the grooves that represent the
80% tension displacement (or the maximum positive travel).
• If the extensometer signal is above +8 V DC (or your
calculated output), adjust the
Δ K (delta K) control for an
extensometer signal of +8 V DC.
• If the extensometer signal is below +8 V DC (or your
calculated output), the
Δ K adjustment cannot be made. Return
the Δ K adjustment to its original setting and use the gain
control to increase the voltage halfway from its present value
to +8 V DC (this splits the difference between compression
and tension).
How to Use a Calibration Stand
This method requires a tool such as the Model 650.03 Calibrator from
MTS Systems Corporation. Use this procedure as a guideline to
calibrate other extensometers.
1. Set up the controller.
Your test controller must be configured to use the extensometer
signal