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S7200 TV Signal Analyzer Operation Manual
VBW: Video BandWidth filter
In order to reduce the influence of noise variations in the display of signal
amplitude, Spectrum Analyzers typically smooth or average the trace display. The
selectable video bandwidth filter in a spectrum analyzer is used for that purpose.
It is a low-pass video filter, which determines the bandwidth of the video signal
located behind the envelope detector. The value of this video filter is typically
lower than the RBW selected. The intended purpose is to average or smooth the
displayed signal.
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