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How to measure RMS Noise Floor of Oscilloscopes?

Question asked by okwh on Dec 19, 2012
Latest reply on Jan 2, 2013 by algoss
I just received a MSO9104A Oscilloscopes.
RMS Noise Floor shown in p18 of datasheet are about 2% of  scale/div.
but I measure them are 20% of scale/div when no any probe installed. 
What's wrong with it ?
How to measure  RMS Noise Floor  and  define? 

Thanks for your help.