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what is the difference of Resolution bandwidth and video bandwidth in spectrum analy

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alimjoco

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What is the difference between resolution bandwidth and video bandwidth in a spectrum analyzer? How do spectrum analyzer measure spectral energy? Is it avarage power in each RBW?
 

biff44

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A spectrum analyzer is nothing more than this:



The bandpass filter in the front end limits how much energy width (in frequency) gets to the power detector by setting the RBW ( and also the center frequency F0).

AFTER the power is detected, you can smooth it out (lowpass filter) with the VBW control.
 

eagle5

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VBW is only used for visualization.
RBW, on the other hand, strongly affects the measuring time and noise.
 
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