User`s guide

8 The Root Locus Design GUI
8-18
The critical gain value for stability is approximately 43.9.
Note: You can also test how much the g ain ca n be incre ased w hile
maintaining stabi lit y by arbit rarily a pplyi ng diff erent values of the ga in in
the text area next to
Gain (pressing the Ente r key after entering each value)
until one pair of comp lex p oles reaches the imaginary a xis.
After using the zoom tools on the GUI, you may want to store one set of zoom
focus settings so that you may later return to focus o n t hat same region of t he
locus.
Use the right-most Zoom button
to zoom out.
The limiting gain set point for
stability
You can also store this zoom focus set-
ting using the Axes settings described
in the next section.