ScopeFIR includes several powerful zooming capabilities to let you examine your FIR filter's frequency and impulse response plot in detail.  Zooming works differently (better!) in ScopeFIR than in most other applications because it has been specifically designed for maximum user speed and flexibility. ScopeFIR provides four different zoom modes, Wheel-Zoom, X-Zoom, Y-Zoom, and Box-Zoom.  See the Zoom Modes topic for a full description of how to use each mode.

In ScopeFIR, zooming is hierarchical, that is, ScopeFIR remembers multiple nested zoom levels. After defining one or more zoom levels, you can navigate among them using the menu that appears when you right-click the mouse. You can select from the following:

• Zoom Next - takes you down to the next zoom level (like Zoom In), or, if you are at the bottom, it wraps you around to the top level (like Zoom Top.)
• Zoom Top - takes to you to the fully un-zoomed view.
• Zoom In - takes you down (in) one zoom level.
• Zoom Out - takes you up (out) one zoom level.
• Zoom Bottom - takes you to the lowest zoom level.

The Zoom Top or Zoom Bottom selections are checked if you are currently at the Top or Bottom zoom level.

Whenever you define a new zoom level, all lower zoom levels are eliminated. For example, if you have defined four zoom levels, then you move up to the second one, then you define a new zoom, the previous third zoom is replaced by the new zoom, and the fourth zoom level is eliminated.  This assures that all zoom levels remain nested.

Zooming will not occur if the zoom will result in a data range with less than four points.

In some editions of ScopeFIR, the number of zoom levels is limited. Check the ScopeFIR Registration topic for details.