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Noise Measurement with a 35670A

Question asked by alexu on Aug 12, 2015

I am trying to measure the noise amplitude density of a differential voltage signal using a Agilent 35670A. The differential channels of the signal are connected to input channel 1 and 2 of the analyzer. My proceeding is as follows: 

I define the math functions
F1 = Time1 - Time2
F2 = PSD(FFT(F1)*FFT(F1))

this gives me the results in dB V^2/Hz. To get amplitude density in units V/sqrt-Hz I calculate
n = sqrt(10^(N/10))
where N are the result values from F2. I'm not really convinced that this is correct anymore as I can't find detailed information on the math functions and their inputs in the decumentation. Can someone confirm that this is correct or give advice on how to achive what I need?

Thanks a lot!