Reviewing Spectra Data
dataPAC User’s Guide
85
To change the spacing between sidebands
When <F1> shows (Move Cursor (S)) the sideband cursors are active. Pressing the arrow
keys when the secondary cursors are active changes the spacing between the sidebands. The
primary cursor does not move.
Using Harmonic Cursors with a Spectrum
Harmonic cursors allow you to view a fundamental (usually machine speed) cursor and up
to ten harmonic cursors placed at harmonic intervals from the fundamental cursor.
The fundamental cursor is drawn at full height, and the harmonic markers are drawn at
reduced height at 1/2, 2, 3, 4...11 times fundamental frequency.
The fundamental cursor frequency is displayed in the information display at the top of the
screen and is updated as you move the cursor with the arrow keys.
Below is a diagram of the FFT Display window with harmonic cursors.
To move harmonic cursors
The fundamental cursor is positioned by default at the machine speed (loaded with the route
data, or manually entered at collection time). However, you can change the position using
the right and left arrow keys.
To set machine speed with harmonic cursors
When the spectrum display is viewed with harmonic cursors from the Review Data or Data
Collection applications, the Set Speed softkey is available. This softkey stores the machine
speed field with the current cursor frequency. This may be useful when the frequency axis is
displayed in orders. This mode displays frequency divided by machine speed, making it
easy to identify relationships between the machine rotating speed and peaks in the spectrum.
This speed is unloaded to the host software system and is archived with your data history.
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