188 Keysight N9915-90020 User’s Guide
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)FUTURE
SA Mode Settings
— 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
1. Press BW 2
.
2. Then
Video BW
3. 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.
AF RBW (Audio-Frequency Resolution BW)
AF RBW - sets the audio-frequency resolution bandwidth for the selected
frequency (Default = Auto).
The Res BW setting also affects the Sweep Type setting. Learn how in
“Sweep Type” on page 189.
To change this setting from Man to Auto, press Video BW twice.
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