Reviewing Spectra Data
dataPAC User’s Guide
83
Below is a diagram of the Dual Cursors FFT Display.
To move and switch active cursors
With dual cursors, only one cursor can be moved at a time. The one that you can move is
referred to as the active cursor. The active cursor appears as a dashed line, and the inactive
cursor appears as a dotted line.
You can move either one of the dual cursors using the arrow keys. Press <SHIFT> while
pressing the arrow key for larger adjustments. As you hold the arrow key, the cursor moves
progressively faster.
To switch the active cursor, press <F1> (Move Cursor (H/L)) The H and the L represent the
high frequency and low frequency cursor.
The low and high cursors never occupy the same horizontal position, pass each other, or
change positions. If you are moving one cursor and it bumps into the other, they both begin
to move together. If you are moving a cursor and it encounters the edge of the display, it
causes the display to contract to show any bins immediately outside the current display
range.
To calculate Band RSS Amplitude
In dual cursor mode, the “Band RSS Amplitude” field in the information display at the top
of the screen displays the Root Sum Squared amplitude of all bins between the two cursors.
To see this display, you must have Band Overall Amp selected in the FFT Display Options,
or press <SHIFT><F4> (More Info.). See “Using Other Features of the dataPAC Utility
Program” on page 32 for more information.
To calculate Delta Frequency
The difference in frequency between the two cursors is referred to as the Delta Frequency.
When the Delta Frequency is displayed in the information table at the top of the screen you
will see it updated as you move the cursors with the arrow keys. To see this display, you
must have Delta Frequency selected in the FFT Display Options or press <SHIFT><F4>
(More Info.). See “Using Other Features of the dataPAC Utility Program” on page 32 for
more information.
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