E223 - Aliasing: Why Your Oscilloscope May Be Lying To You [E223]

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Matt answers listener emails about oscilloscope aliasing—what it is, whether all scopes can do it, and how it can trick you into diagnosing failures that aren’t real. Using a “pegboard and golf tees” mental model, he explains how a digital storage oscilloscope samples voltage, stores it in memory, and then reconstructs what you see on-screen. The key takeaway: aliasing isn’t magic, it’s math—specifically the relationship between sample rate, timebase, and memory buffer. He also explains why some scopes (especially Sna...