How to set sweep time of speatrum analyzer?

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Hi all,
How to set sweep time of speatrum analyzer to get the correct result?If set the time too fast,get lower power.I get a n equation:BW^2/K,BW----RBW,andi do not know K=?,and why?
Thanks,
 

Spectrum analyzers usually have an "auto sweep time" mode where it automatically selects the proper sweep time depending on your specified resolution bandwidth and video bandwidth.

K depends on the characteristics of the particular filter used in the instrument. Here's a quote from Agilent Application Note 150, "Spectrum Analysis Basics:
"The value of k is in the 2 to 3 range for the synchronously-tuned, near-Gaussian filters used in many Agilent analyzers."

Here is the entire app note, 5952-0292EN.pdf, about 8.5 megabytes:
http://www.home.agilent.com/agilent...c=US&nfr=&ckey=459602&cname=AGILENT_EDITORIAL
 

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