Keysight B Series - Sweep Type

Keysight N9938-90003 User’s Guide 129
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings
—Then Video BW
— Then choose from the following:
—Auto
Couples Video BW to the ResBW in a 1-to-1 ratio.
—Man
Enter a Video BW value using the numeric keypad, the
arrows, or the rotary knob. Then press a multiplier if necessary or
press Enter
. Setting VBW higher than RBW may smooth the trace.
.
The current Video BW setting is shown at the bottom of the screen.
# VBW x.xx XHz (#) means manual setting.
When the Res BW/Video BW ratio exceeds 10,000, a Meas UNCAL warning
may appear to indicate that the Video BW 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 http://literature.cdn.keysight.com/litweb/pdf/5952-0292.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.
—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.
To change this setting from Man to Auto, press Video BW twice.