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support@xanalog.com If you haven’t already, you can get your own free copy of NL-SIM and MML. Part 3 can be found here. NL-SIM lets you make several adjustments while your model is running. Try making the following changes on the Scope time plot window: - Click once on the the Down-arrow box of the secs scale control. Note that the scale changes from 2e2 (200) to 1e1 (100). You’ve just changed the time scale (horizontal axis) of the plot window from 200 seconds to 100 seconds across its screen.
- Click once on the Up-arrow box of the secs control to increase the time scale of the plot window back to its origirnal setting.
- Click on the Up-arrow box of the X out control. Note the effect of the change from 5e-1(0.5) to 1e0 (1.0) on the vertical scale : the height of the signal decreases by a factor of 2.
- Click on the Down-arrow box to return to the original scaling.
So far, all you’ve changed is the scale of the Scope time plot window. Now you’re ready to change one of the parameters of the model itself. - Move the mouse pointer to the damping adjust slider. Notice the blue line in the box and note the numerical value of the damping in the damping digital display on the upper left of the screen.
- Click the mouse towards the bottom of the slider near the value -4. The line will get longer and the damping value will increase. You’ll see that as the damping increases, the ringing of the waveforms on the time plot decreases. The system is now more stable than it was.
Now, click in the slider near the top of the box near the label, 0. The waveform now exhibits hiughly under-damped behavior. You will note that both the digital display and the slider line are now red to indicate that the system is operating in a region very close to instability. This will happen in this model when the damping is less than -0.4 . The under-damped waveform is depicted below: Now, click again in the damping adjust slider near the middle where you originally started. The system becomes much more stable again. The digital display and the slider line color return to blue again. - Click on the STOP Button
- Click on the box with the X in it found in the upper right-hand corner of the control panel.
You are now ready to view the block diagram of the model that you have bean running and adjusting with a control panel. CONGRATULATIONS You have completed the NL-SIM Getting Started Guides Part Two of of Seven Continue on to Part 3 | 
