MTS Series 793 - Manual (Page 208)

MTS Series 793 Tuning and Calibration
Extensometer Calibration
Calibration Procedures 208
7. Apply a negative strain command that is 80% of the negative full scale
range.
A. Set the calibrator micrometer to a negative strain value that is 80% of
the full scale range.
B. Verify that your extensometer feedback signal is 80% of the full scale
range.
At this point, unless the conditioner is still in calibration, the negative strain
applied to the extensometer will not equal your calibrator setting. You will
adjust gain in the next step so that the actual strain and the strain set on the
calibrator match.
8. Adjust gain until the actual strain equals your strain command.
Standalone FlexTest SE Controllers:
Adjust the Post-amp Gain control on the Calibration submenu to increase
the negative strain reading on the calibrator until it equals your negative
strain command.
Select Setup > Strain > Calibration > Cal Type > Gain/Linearization >
Post-Amp Gain
Automated Controllers:
Adjust the Post-amp Gain control on the Calibration tab to increase the
negative strain reading on the calibrator until it equals your negative strain
command.
9. Apply a positive strain command that is 80% of the positive full scale range.
Note Since you are using a Model 493.25 conditioner, with no Delta K
adjustment, you can only adjust Post-amp Gain at one point, either the
+80% point, or -80% point. The other point (+80% or -80%) simply
becomes a data point value for the linearization table.
A. Adjust the Setpoint (Standalone) or Manual Cmd slider (Automated)
for a positive strain command that is 80% of the full scale range.
B. Verify that your extensometer feedback signal is 80% of the full scale
range.
10. Record conditioner feedback readings at predetermined negative strain
settings.
Note You will enter these recorded readings on the Linearization Data window.