MTS Series 793 - Manual (Page 143)

Displacement Sensor Calibration
MTS Series 793 Tuning and Calibration Calibration Procedures 143
The Total Gain value is calculated by multiplying the Pre-Amp and Post-Amp
gain values. If the total desired gain amount is known (from a calibration sheet),
you can enter the amount in the Total Gain box and the software will calculate
the Pre-Amp and Post-Amp gain values automatically.
When you are calibrating an AC conditioner, use the Post-Amp gain control to
increase gain. If more gain is needed, you must disable hydraulics and increase
the Pre-Amp gain. You can then turn on hydraulics and continue to adjust the
Post-Amp gain.
Note This procedure assumes a positive command extends the actuator and a
negative command retracts the actuator. If not, use the opposite polarity
for any values given.
Procedure 1. Select Gain/Delta-K for Cal Type.
Standalone FlexTest SE Controllers: Select Setup > Disp > Calibration
> Cal Type > Gain/Delta-K
Automated Controllers: Select Gain/Delta-K for Cal Type on the
Calibration tab of the Inputs panel.
2. Apply a retraction command that is 80% of the full scale range.
Standalone FlexTest SE Controllers: Standalone FlexTest SE
Controllers:
A. Enable the front panel Dial.
B. Use the Dial to adjust the Setpoint for 80% of the full scale range.
C. Verify that your LVDT displacement signal equals 80% of the full scale
range.
Automated Controllers:
A. Open the Manual Command window, and then click on the Enable
Manual Command.
B. Adjust the Manual Cmd slider on the Manual Command window for
80% of the full scale range.
C. Use the Station Signals panel to verify that your LVDT displacement
signal equals 80% of the full scale range.
During the initial calibration and tuning of your system, it may take repeated
adjustment for the two values to match.