Control Systems: HP prime app, now with frequency, time domain and root locus plots

[hata]

Hi
In Plot Setup, page 3, you can set the range of K values and the sample size.
The K-range for the plot is centered around the current controller gain (if no controller is selected, then this 'center' gain is 1).

Example: suppose controller gain is 200 .
Select K range: controller gain x 0.02 - x 50 ==> this will plot for a gain range from 4 to 10000.
Select sample size 50.
==> the plot will contain the roots for K = 4, K = 4.68, K = 5.47, ....., K = 200 (centerpoint), ..., K = 8.55 E3, K = 1 E4 (so, in fact, the sample size will be 51 = uneven, to allow K = 200 as center point).
You can quickly go to center point and end points by pressing Shift and then the left or right arrows.
Note that K values form a geometric progression (each K value is calculated by multiplying the previous K value by a fixed factor).

BUT you can display the roots for ANY K value (also outside the selected range) by pressing Goto and then filling in that K value (when the plot is displayed).
If you enter K = 0, the roots for the OPEN LOOP system will be shown.

Use the OPTIMIZE softkey to adjust the plot if necessary.

You might want to check out the manual ! Most is explained there :-)

Thanks for your feedback
Herwig