Video Bandwidth (Video Bw); Sweep Type - Keysight Technologies FieldFox A Series User Manual

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SA (Spectrum Analyzer) Mode

SA Mode Settings

This setting could impact the accuracy of the measurement. See Specifications

in Appendix B.

The Res BW setting also affects the Sweep Type setting. Learn how in

"Sweep Type" on page 166

Video Bandwidth (Video BW)

Video BW is a smoothing operation that is performed after measurement data

is acquired. The trace data is effectively smoothed so that the average power

level of the displayed noise is the same, but the peaks and valleys of adjacent

data points are smoothed together. More smoothing occurs as the Video BW is

set lower. However, as the Video BW is narrowed, the sweep speed becomes

How to set VBW

— Press BW 2.

— Then choose from the following:

To change this setting from Man to Auto, press Video BW twice.

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

may appear to indicate that the Video BW filter has reached the maximum

capacity for averaging.

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

Couples Video BW to the ResBW in a 1-to-1 ratio.

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.

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Keysight N9927-90001 User's Guide

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