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RE: If the sine wave isn't pretty???

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This Post Has Been Edited by the Author

In Reply to: RE: If the sine wave isn't pretty??? posted by TomWh on March 14, 2017 at 11:29:41

A meter will tend to average out all that noise. I would trust the scope over any meter.
You also have to be careful and not introduce a ground loop via your e=test equipment - especially on something like a phono stage with it's low signal levels and high gain.
For example is does your scope have a three wire power cord? The scope electrical ground can easily carry noise into the system under test and corrupt the measurement. This is one of those cases where it's often necessary to lift he scope safety ground just for a test. Ideally in that case the scope should be operated through a 120v/120v isolation transformer

Edits: 03/14/17

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