MTS Series 793 - Manual (Page 164)

MTS Series 793 Tuning and Calibration
Force Sensor Calibration
Calibration Procedures 164
Delta K compensates for differences in symmetry between positive and negative
outputs.
Calibrate compression at 80% full scale for each range.
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.
Gain controls
Pre-Amp gain is a selectable gain amplifier with predefined values. Since
changes in Pre-Amp gain can cause spikes in the feedback signal, Pre-Amp gain
can only be adjusted when hydraulics are off.
Post-Amp gain is a finer, operator-defined gain control that can be adjusted
when hydraulics are on.
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 a DC 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.
mechanical input
Indicated output
Δ K > 1 Δ K = 1
Δ K < 1
Gain