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dataPAC User’s Guide
Chapter 3 - Collecting and Reviewing Data
There are several types of cursors available with the spectrum display:
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Single Cursor - Displays only the horizontal and vertical axis values of the cursor. Use
the right and left arrow keys to move the frequency cursor and use the up and down
arrow keys to move the amplitude cursor.
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Harmonic Cursors - Displays cursors at multiples of the fundamental frequency.
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Dual Cursor - Displays the frequency and amplitude difference between a reference
cursor and the active cursor.
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Sideband Cursors - Displays equally spaced cursors to either side of the reference
cursor.
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Diagnostic Frequency Cursors - (dataPAC 1500 only) When frequency items are
loaded with a list from EMONITOR Odyssey or Enshare, the dataPAC 1500 can
display the frequency item that goes with the cursor.
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Peak Cursors - When you press the arrow key, the cursor moves from one peak to the
next.
This section contains examples of all the types of cursors.
Press <SHIFT><F1> (Cursor Type (D/H/S/F/P)) to change the current cursor mode for the
display. The letter in parenthesis identifies the current cursor mode. Cursor modes are:
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Cursor Type (D) = Dual Cursors
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Cursor Type (H) = Harmonic Cursors
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Cursor Type (S) = Sideband Cursors
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Cursor Type (F) = Diagnostic Frequency Cursors
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Cursor Type (P) = Peak Cursors
Using Dual Cursors with a Spectrum
Dual cursors are typically used to identify an area of the display to be expanded
horizontally; usually to inspect more closely an interesting portion of the spectrum. Or, you
can use them to determine the amplitude in a band between two frequencies.
Note: While collecting a spectra, the dataPAC 1500 can drive a photostrobe at the same frequency
as the active spectral cursor. The strobe should be connected to the dataPAC’s DATA I/O
connector and must be compatible with a TTL trigger input. See “Driving a Strobe While
Collecting an Off Route Spectrum” on page 197.
When you select Dual Cursors, the display shows two full height frequency cursors. The
frequency and amplitude values of the active cursor are shown at the top of the screen.
When more than one spectral bin occupies the display position of the active cursor, the
values displayed correspond to the highest amplitude bin at that display position.
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