National Instruments Xmath Interactive Control Design Module ICDM - Manual (Page 61)

Chapter 6 Pole Place Synthesis
Xmath Interactive Control Design Module 6-6 ni.com
A circle of radius F
avg
also is displayed in the plot. You also can drag the
circle to change F
avg
.
Butterworth Configuration
Click the Butterworth button to move the poles to a Butterworth
configuration, preserving F
avg
. The initial pole configuration also is
set to Butterworth.
Editing the Closed-Loop Poles
You can change the closed-loop poles two ways: by editing or by grabbing
and dragging them. Both of these methods are described in the
General
Plotting Features section of Chapter 2, Introduction to SISO Design .
Slider and Plot Ranges
To change the ranges of the Frequency Scaling slider or the plot of
closed-loop poles, select View»Ranges or press in the Pole Place
window.
The slider range also will be changed automatically if you type a new value
which is outside the current range in the variable edit box. The plot also can
be re-ranged interactively by grabbing and dragging the plot axes; refer to
the
General Plotting Features section of Chapter 2, Introduction to SISO
Design .
Selecting View»Auto-scale or pressing in the Root Locus
window will cause new ranges to be assigned to the slider and plot,
based on the current controller.