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Easily Overlooked Features - Spring 2006
This section is designed to highlight one or two features per issue that may be overlooked because they
are not made visually obvious with a toolbar button.
Reduce Data Points Dialog Box
For some simulations, a very small timestep is used to obtain a high degree of accuracy.
However, all of the data points calculated may not be necessary for the visual inspection of
the waveform. Having a large amount of data points in the simulation will increase the redraw
times of the plot when going between cursor and scope modes, adding text, adding tags, or any
other operation that requires a redraw. The Reduce Data Points option provides a method to
delete a portion of the calculated data points in order to help speed up the redraw operation.
This option is available under the Transient, AC, or DC menus, and the corresponding dialog box
appears below.
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This dialog box lets you discard every n'th data point in a save or display operation. Note
that if you reduce data points for a save operation, it will also use the display reduce
figure when displaying it during a retrieve operation. For example, if both the Save and
Display are set to keep every tenth point, performing a save and then retrieving the file
without changing either of these will produce an analysis showing every hundredth point.
If a DSP operator is used in conjunction with either of these methods, then they are forced
to use every data point, and any changes in this dialog box will not have an affect. An FFT
window will use the reduced data point set though.
Save every n'th data point: This list box controls the percentage of data points
saved in the file when the Run Options is set to Save or a probe analysis is run.
Display every n'th data point: This list box controls the percentage of data
points that are plotted when the Run Options is set to Normal or Retrieve. This will be
disabled if Now is selected and a DSP waveform is being plotted.
Now: This uses the Display settings to reduce the number of data points in the plot
that is presently in memory. The deleted data points cannot be retrieved.
Run Time: This will use the Save and Display settings the next time a simulation
is run with the circuit file.
While the Reduce Data Points option is also available in AC and DC analysis, it typically is
not required as those simulations are usually not data point intensive.
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