The following figure shows the Graphical Tuning window and introduces some terminology.
Graphical Tuning Window
Bode and Nichols plots in the graphical tuning window automatically display the following information:
Gain margin and the -180 degree phase crossing frequency where it is measured
Phase margin and the 0 dB gain crossing frequency where it is measured
Whether the characteristic equation 1+L is stable (Stable loop) or unstable (Unstable loop). L is the open loop plotted in the figure.
For row or column arrays of LTI models, the plots display the characteristics of the nominal model only.
The following topics describe the Graphical Tuning window features: