MTS Series 793 - Manual (Page 43)

About Tuning
MTS Series 793 Tuning and Calibration Introduction 43
A square waveform is best suited to view the overshoot and ringing
characteristics that occur when tuning a system. Review the following
waveforms to determine the kind of characteristics that can be found in an error
signal.
Command
Feedback
Error
Signal
Static
Accuracy
Difference
Command Feedback
Error
Signal
Following Error
Difference
Command
Feedback
Error
Signal
Actuator
Friction
Zero
Zero
Zero
The error signal from a
square wave should show
the feedback ringing
centered on the zero
reference. A static
accuracy difference in the
error signal can be
corrected with reset.
The error signal from a sine
should be a small amplitude
sine waveform that looks
like a rounded square
waveform.
The square wave shape of
the error signal represents
the phase lag of the
feedback signal.