SA (Spectrum Analyzer) Mode 91
In Zero Span, the maximum Res BW/ Video BW ratio is 100.
Sweep Type
In SA mode, the FieldFox uses two sweep types to process inputs signals. The
sweep type that is currently being used (FFT or Step) is displayed in the lower-
left corner of the FieldFox screen.
For a more comprehensive tutorial, see Spectrum Analysis Basics (App Note 150)
at http://cp.literature.agilent.com/litweb/pdf/5952-0292.pdf
How to set Sweep Type
Press BW 2.
Then Advanced
Then Sweep Type
Then choose from the following:
o Auto The FieldFox selects the most efficient sweep type based on the Res
BW. When Res BW is set to 200 kHz and below, FFT sweep type is selected.
Above 200 kHz, Step sweep type is being performed.
o FFT The FieldFox uses FFT sweep type regardless of the Res BW.
o Step The FieldFox uses Step sweep type regardless of the Res BW. This is
useful for capturing impulsive noise that may be generated from nearby
electrical equipment.
IF Output
The FieldFox IF (intermediate frequency) can be output for external signal
processing. The signal is available from the IF Out connector on the FieldFox
right-side panel. See the connector on page 17.
The IF Out signal, centered at approximately 33.75 MHz, is simply a down-
converted version of the RF Input signal that is present at the tuned frequency.
While outputting an IF signal, the FieldFox stops performing the InstAlign
process. Therefore, the amplitude of traces on the FieldFox screen is NOT
accurate and Meas UNCAL appears on the screen to indicate this. Learn more
about InstAlign on page 100.
Learn more about the IF Output frequencies and bandwidths in the
Supplemental Online Help: http://na.tm.agilent.com/fieldfox/help/FieldFox.htm
How to select IF Output
The IF Output signal is useful only in Zero Span. Learn more about Zero Span on
page 93.
At least one sweep must be made in order to tune the FieldFox.
Press BW 2.
Then Advanced
Then IF Output Use
Then choose from the following:
o OFF No output from the IF Out connector.
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