Its a bit noisy of course, but you can still clearly see the individual pulse widths. Up to 1GHz should be countable, I'd say.
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By the way, this scope shot is a good demo of how the typical misconception that bandwidth (or sampling rate) directly limits time resolution is wrong. I just measured the time resolution of ~400MHz PWM on a 100MHz scope at 1GS/s (close to Nyquist and well above analog BW!)https://twitter.com/marcan42/status/1042670838728679424 …
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Come to think of it, that was in 2ch mode, so 500MS/s, not 1GS/s. Even worse!
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