Calibrating an Extensometer
Model 493.02 Controller Service
Calibration
185
9. Apply a negative strain command that is 80% of the negative full
scale range.
A. Adjust the Setpoint (Stand-Alone) or Manual Cmd slider
(Automated) for a negative strain command that is 80% of the
full scale range.
B. Verify that your extensometer feedback signal is 80% of the
full scale range.
During the initial calibration and tuning of your system, it may
require repeated adjustment for the negative strain command and
feedback values to match.
At this point, unless the conditioner is already in calibration, the
negative strain applied to the extensometer will not equal your
commanded value. You will adjust gain in the next step so that the
actual strain and your commanded strain match.
10. Adjust gain until the actual strain equals your strain command.
Stand-Alone:
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. Path: Setup > Strain >
Calibration > Cal Type > Gain/Linearization > Post-Amp Gain
Automated:
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.
11. Apply a positive strain command that is 80% of the positive full
scale range.
A. Adjust the Setpoint (Stand-Alone) 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.