SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings
AF RBW (Audio-Frequency Resolution BW)
AF RBW - sets the audio-frequency resolution bandwidth for the selected
frequency(Default = Auto).
How to set AF RBW
—Pr
ess BW 2 > AF RBW
— Then choose from the following:
—AutooCouples AF BW to the Resolution BW in a 1-to-1 ratio.
—Man
Enter a AF BW value using the numeric keypad, the arrows,
or the rotary knob. Then press a multiplier if necessary or press Enter
.
Setting AF BW higher than RBW may smooth the trace.
The current AF RBW setting is shown at the bottom of the screen.
# AF RBW x.xx XHz (#) means manual setting.
When the Res BW/AF RBW ratio exceeds 10,000, a Meas UNCAL warning may
appear to indicate that the AF RBW filter has reached the maximum capacity
for averaging.
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
https://www.keysight.com/us/en/assets/7018-06714/application-notes/595
2-0292.pdf
How to set Sweep Type
—Press BW 2.
—Then Advanced
—Then Sweep Type
— Then choose from the following:
—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.
—FFT
The FieldFox uses FFT sweep type regardless of the Res BW.
To change this setting from Man to Auto, press AF RBW twice.
Keysight N9938-90003 User's Guide
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