MTS Series 793 - Manual (Page 167)

Force Sensor Calibration
MTS Series 793 Tuning and Calibration Calibration Procedures 167
2. Apply a compressive force command that is 80% of the range’s full scale.
Standalone FlexTest SE Controllers:
A. Enable the front panel Dial.
B. Using the Dial, adjust the Setpoint for a compressive force command
that is 80% of the full scale range.
C. Verify that your force transducer feedback signal is 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
a compressive force command that is 80% of the full scale range.
C. Use the Station Signals panel to verify that your force transducer
signal equals 80% of the full scale range.
During the initial calibration and tuning of your system, it may require
repeated adjustment for the compressive force command and feedback
values to match.
Note If the actuator response is sluggish and/or the signal value does not
match the command, you will need to adjust the tuning of this control
mode. Increase the proportional gain (P Gain on the Tuning menu) to
correct sluggish actuator movement. Increase the reset integration value
(I Gain) to help the feedback match the command.
At this point, unless the conditioner is already in calibration, the
compressive force applied to the force transducer will not equal your
commanded value. You will adjust Delta K in the next step so that the actual
compressive force and your commanded compressive force match.
Example: Suppose your actuator has a 100% compressive force rating of 10
kN. In this step you would apply 8 kN of command, and even though the
station signals would read 8 kN of feedback, the force standard may only
read 4 kN. This shows the conditioner/sensor pair are out of calibration.
3. Adjust Delta K until the actual compressive force equals your compressive
force command.
Adjust Delta K on the Calibration submenu or tab to increase the
compressive force reading on the load standard until it equals your
compressive force command.