Hi Mike,
Strange things in the dot pattern happen indeed in Random mode, but I don't remember a case of time-reversal.
I think much depends on the repetition rate of your signal generator. I think the 264 and S-52 gave me no problems. I don't have faster repetition fast pulses.
Long ago I have seen negative rise and fall time with 3S76/3T77A. And that was sequential mode while showing the square wave output of a 284.
Albert
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--- In TekScopes@..., "Mike" <zuckerme@...> wrote:
David, Albert-
I have vaguely similar issues with both my 7T11 and 7T11A in random mode. I see large gaps in the horizontal dot density, and even misplaced (time-reversed!!) dots. For example by moving 7S11 delay, 7T11 time offset, and trigger position I can display a 100 ps step with positive, zero or even negative risetime (all with clean repeatable triggering).
---
Mike
