Spectrum Analyzer -Zero Span operations tutorial video.
The net effect of how a spectrum analyzer works is to take resolution bandwidth (RBW) filter followed by a detector, swept across a given frequency span. Zero Span is parking that filter at a given frequency and then detecting the amount of power that exists in that filter over time. It's kind of a time domain view of the amplitude variations of a given signal in that filter...(see video for more)
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