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Meaning of Resolution Bandwidth with zero-span

Question asked by juanxu on Feb 7, 2012
Latest reply on Mar 23, 2012 by thecarver

I'm making a computer program to measuse power of frecuencies with HP8590L and Matlab. I can modify some parameters of the analyzer like the resolution bandwith. I know this parameter change the filter of the signal in the analyzer and if you make it smaller then the time of the adquisition data  will be increased. In non-zero span this increment of time exists but it's small but when I change to zero-span increment makes bigger, about 1 second between 300 Hz and 300 kHz. So, i think I've missed some of the meaning of the resolution bandwith when span is set to zero. Could someone help me to understand it?

Thank you,