Originally Posted by Simon - PG Music
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What you can do with it is scope the DC output rails to look for ripple.
Set the scope to AC with the lowest voltage resolution, then adjust the vertical position so that the trace is visible. That way, you will only be seeing the ripple voltages, less the DC offset.

Bear in mind that most drive supplies provide a +5V and a +12V supply rail, and also that the computer PSU will have multiple DC outputs.


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