What is dBVrms in Benchtop Spectrum Analyzer VI

[Nasirh]

I am using Earthworks preamp microphone to get a noise signal that I am reading in Labview with a BNC board using Benchtop Spectrum Analyzer VI.  I get a graph that is dBVrms v. Frequency.  I am having trouble figuring out what is dBVrms and can I convert this to dB or the noise level.  Thanks in advance.

[iZACHdx]

Hello,

I believe that this article should help you out: http://zone.ni.com/devzone/cda/tut/p/id/4278 

-Zach

[Nasirh]

Thanks Zach.  I have a copy of this article but I am still confused. 

[iZACHdx]

Hello,

Which part are you having trouble with? Based on the formulas and information provided in the document, you can convert back to Vrms with: 10^( dB Vrms / 20 ) = Vrms . After that, Vrms = V/sqrt(2).

-Zach