MTS Series 793 - Manual (Page 39)

About Tuning
MTS Series 793 Tuning and Calibration Introduction 39
Advanced and
Advanced Only
controls
Selecting an Auto-Tuning Type of Advanced or Advanced Only displays
Tracking and Sweep Freq controls in the Auto-Tuning applications control panel.
Tracking Tracking specifies how closely the advanced tuner attempts to track the
command. Tracking values should be appropriate for the test to be performed.
Too high Tracking values may produce tuning values that are unstable for some
systems and can cause auto-tuning to fail. The 50% default setting is usually a
good starting point. If auto-tuning fails with this default setting, lower the
Tracking value.
Sweep Freq
Sweep Freq specifies the upper frequency limit of the sine sweep used by the
Advanced auto-tuner. The 20 Hz default setting is usually a good starting point.
For Advanced auto-tuning, you should change the sweep frequency to create a
phase shift greater than 90º for 0% tracking (or 135º for 100% tracking) between
the command and compensated command.
You can monitor the advanced tuner command and compensated command on
the scope.