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Y unit of 35670a

Question asked by manfred777 on Jan 19, 2011
Latest reply on Jan 21, 2011 by Tisfurs

I am confused by the Y unit of 35670a when I measure the noise spectrum.

The frequcy range is 10 Hz - 110 Hz. For the 50 Hz noise, the Vrms value is 413 uVrms.  When the unit is changed to  Vrms/√Hz, the value is 422.5 uV/√Hz. Then I set the frequcncy to 10 Hz-810 Hz, the Vrms  and Vrms//√Hz is 416 uVrms and 150 Vrms//√Hz, respectively.

What is the relationship between Vrms and Vrms//√Hz. I though Vrms//√Hz = Vrms/√bandwidth, but it was not that in  35670a.

Can anybody help me?