Resolution Bandwidth (Res Bw); Video Bandwidth (Video Bw) - Keysight B Series User Manual

SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings
— Press Cal 5
— Then

Resolution Bandwidth (Res BW)

In SA Mode, the Res BW provides the ability to resolve, or see closely spaced
signals. The narrower (lower) the Res BW, the better the spectrum analyzer can
resolve signals. In addition, as the Res BW is narrowed, less noise is measured
by the spectrum analyzer ADC and the noise floor on the display lowers as a
result. This allows low level signals to be seen and measured. However, as the
Res BW is narrowed, the sweep speed becomes slower. See
Times" on page
How to set Res BW
— Press BW 2.
— Then
— Then choose from the following:
The current Res BW setting is shown at the bottom of the screen.
#Res BW x.xx XHz (#) means manual setting.
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 129

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
slower.
How to set VBW
— Press BW 2.
128
Amptd Alignment OFF
134.
Res BW.
—Auto Res BW is coupled to the frequency span. As the frequency span
is narrowed, the Res BW is also narrowed providing increased ability
to resolve signals.
To change this setting from Man to Auto, press Res BW twice.
—Man Enter a Res BW value using the numeric keypad, the
or the rotary knob. Then press a multiplier if necessary or press Enter
"Very Long Sweep
Keysight N9938-90003 User's Guide
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