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I am atomic! Lol. You can edit your posts if you want to there should be an edit button next to quote if you are reading this via a web browser.
It's encouraging that it was an external generator, but you can still get same false reassurance from an external generator if both the generator and scope have 3 prong power cords...Most test equipment that have 3 prong power tie the signal negative/ground to building ground and test equipment plugged into the same outlet can sometimes use that in lieu of the signal cable ground when it goes open.
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