MTS Series 793 Controller - Manual (Page 56)

MTS Series 793 Controller Overview
Using the Station Manager Application to Create
Operation Concepts 56
To complete this task, make sure the force tuning values established in your
parameter set are suitable for the test you are about to run. To do this, you
typically:
• Create and apply a simple tuning program with the function generator
• Evaluate the current force tuning values by comparing command and
feedback signals
• Make Proportional (P) gain and Integral (I) gain adjustments to achieve
optimal force tuning
Displacement tuning values typically do not require frequent adjustment.
Optimal force tuning values, however, are a function of specimen compliance,
which tends to change over time, or even from test to test. Because of this, it is
good practice to tune the force control mode often. You should also tune the force
control mode whenever you make any change to the force train, such as changing
gripping fixtures.
Verifying calibration
adjustments
You can verify the calibration of your force sensor (load cell) by performing a
shunt calibration. It is good practice to perform a shunt calibration before you
begin a test to ensure accurate test data.
After your force sensor is calibrated for the first time (or when it is fully
recalibrated), someone will perform a shunt calibration to create a reference
value that will be stored in the calibration file of the force sensor.
You periodically compare this reference value with the values you obtain when
performing subsequent shunt calibrations. This validates the current state of
calibration of the force sensor.
Saving station views
To avoid reopening windows and displays each time you reopen a station
configuration, you save the desktop layout as a station view. When you restore a
saved view, the windows reposition automatically.
Each time the Station Manager application closes, it saves the current station
view as the default view. When you reopen the station it appears with the
windows repositioned as they were when the station was last closed. This allows
you to revert to the last saved station view.
You can also restore a default view by selecting Restore Default View. This
function repositions the station windows to where they were the last time the
station was closed.