Keysight Technologies C Series - Sweep Type

Keysight N9915-90020 User’s Guide 189
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)FUTURE
SA Mode Settings
How to set AF RBW
1. Press BW 2
> AF RBW
2. Then choose from the following:
— Auto Couples 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
1. Press BW 2
> Advanced > Sweep Type
2. 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 AF RBW twice.