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LTI Viewer Preferences Editor

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Opening the LTI Viewer Preference Editor Units Pane Style Pane Options Pane Parameters Pane

Opening the LTI Viewer Preference Editor

Select LTI Viewer Preferences under the Edit menu of the LTI Viewer to open the LTI Viewer Preferences editor, which is a tool for customizing various LTI Viewer properties, including units, fonts, and various other viewer characteristics. This figure shows the editor open to its first pane.

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Units Pane

You can select the following on the Units pane:

• Frequency — Radians per second (rad/sec) or Hertz (Hz)

• Magnitude — Decibels (dB) or absolute value (abs)

• Phase — Degrees or radians

For frequency axis, you can select logarithmic or linear scales.

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Style Pane

Use the Style pane to toggle grid visibility and set font preferences and axes foreground colors for all plots in the LTI Viewer. This figure shows the Style pane.

You have the following choices:

• Grid — Activate grids for all plots in the LTI Viewer

• Fonts — Set the font size, weight (bold), and angle (italic)

• Colors — Specify the color vector to use for the axes foreground, which includes the X-Y axes, grid lines, and tick labels. Use a three-element vector to represent red, green, and blue (RGB) values. Vector element values can range from 0 to 1.

• If you do not want to specify the RGB values numerically, press the Select button to open the Select Colors window. See Select colors for more information.

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Options Pane

The Options pane has selections for time responses and frequency responses.

The following choices are available:

• Time Response:

  • Show settling time within xx%— You can set the threshold of the settling time calculation to any percentage from 0 to 100%. The default is 2%.

  • Specify rise time from xx% to yy%— The standard definition of rise time is the time it takes the signal to go from 10% to 90% of the final value. You can choose any percentages you like (from 0% to 100%), provided that the first value is smaller than the second.

• Frequency Response:

  • Only show magnitude above xx—Specify a lower limit for magnitude values in response plots so that you can focus on a region of interest.

  • Unwrap phase—By default, the phase is unwrapped. Wrap the phrase by clearing this box. If the phase is wrapped, all phase values are shifted such that their equivalent value displays in the range [-180°, 180°).

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Parameters Pane

Use the Parameters pane, shown below, to specify input vectors for time and frequency simulation.

The defaults are to generate time and frequency vectors for your plots automatically. You can, however, override the defaults as follows:

• Time Vector:

  • Define stop time — Specify the final time value for your simulation

  • Define vector — Specify the time vector manually using equal-sized time steps

• Frequency Vector:

  • Define range — Specify the bandwidth of your response. Whether it's in rad/sec or Hz depends on the selection you made in the Units pane.

  • Define vector — Specify the vector for your frequency values. Any real, positive, strictly monotonically increasing vector is valid.

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Introduction

Graphical Tuning Window Preferences Editor

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