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DSOX3000 FFT Spurs at 125 MHz harmonics

Question asked by KG4ARN on Apr 17, 2012
Latest reply on Apr 24, 2012 by KG4ARN
DSOX3024A   I see spurs at 125MHz, 250, 500 etc on the FFT function.  This occurs on all 4 channels, scope input impedance set at either 50 ohms or 1 Meg.  Input BNC open or terminated either with a scope probe or 50 ohm terminator.  It is about 20 dB above the noise level.    It is also present at various span and center frequency settings.  It does not appear to be external interference.  Has anyone else noticed this?

I have added the screen shots and the scope setup data.

Edited by: KG4ARN on Apr 18, 2012 4:27 AM

Edited by: KG4ARN on Apr 18, 2012 4:33 AM