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DSO80204B, sine wave statistics

Question asked by patrickzou on Feb 29, 2008
Latest reply on Mar 3, 2008 by marowley

I am monitoring a sine wave output from scope, sometimes, its phase changes. Is there any way I can put the first sine wave still, and the rest of the sine wave is just adding to the first wave form? So that, after running for a long time, I can see any distortion.