On Mon, 15 Oct 2018 at 11:08 Chuck Harris <cfharris@...> wrote:
All we can do is guess. My guess is at any point in time, after mostAnecdotally my 2467 was "a fair bit out" after I repaired it. Sadly I
didn't think to record how far out it was, I just remember being glad of
having done the work to calibrate it.
The repair was pretty trivial, in the end a 3V zener that clamps the -1.25V
reference voltage had decided to make like a short. I don't know how long
ago that scope had last been calibrated, but I don't think the repair threw
it, I think it just drifted over time.