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Phase noise unreal peak at 1.6 - 1.9 Hz

Question asked by Femtosecond on Jul 14, 2011
Latest reply on Jul 22, 2011 by JohnMiles
Hi,

I have a E4445A SA. When I use the phase noise option to measure any signal I have a huge unreal spike at about 1.6 - 1.9 Hz. You cannot see it until you plot the data on a PC since on the SA itself it only shows you the data from 3Hz on.

I get this peak often, but not always. No matter what signal I measure, even from a synthesizer. We have two of the E4445A SA here and both show the same behavoir.

Does anybody know what this is or how to get rid of it?  

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