SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings
—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 arrows,
or the rotary knob. Then press a multiplier if necessary or press Enter
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.
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.
—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.
The Res BW setting also affects the Sweep Type setting. Learn how in
“Sweep Type” on page 182
To change this setting from Man to Auto, press Video BW twice.
Keysight N9938-90003 User's Guide
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