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N9020A MXA Artifacts

Question asked by cuba_pete on Jan 8, 2015
Latest reply on Jan 22, 2015 by MikeM
I am looking around 600 kHz real time and have an artifact which is always centered on the display.  I have move up and down 100 kHz and the artifact remains.  I have verified with an older 8960E that the signal is not external.  The artifact is always centered on the graticule.

Does anybody have any idea what is causing this, and how to get rid of it?