21-07-2020, 03:38 PM
(21-07-2020, 02:51 PM)Mike Watterson Wrote: The Hameg scope I have uses 485V AC on the transformer and a diode multiplier to get the approximately -2000 V EHT.
That's a good point - I'd forgotten Hameg did that. The only paper manual I have here is for the HM203-6 from the mid '80s, but that one definitely was mains-derived. I guess they decided that as the EHT was only 2kV overall, it wasn't worth going down the HF PSU route
I remember these scopes being pretty reasonable for what they were when we used them at university, especially given how low the EHT was. The 60MHz version (HM604 IIRC) was much brighter/sharper though - that was 12kV, with the expected separate HF PSU.
From the point of view of the beginner, my favourite thing about the Hameg 'scopes was the green "triggered" LED. As we know, triggering is often what causes most confusion for people new to the 'scope, and this goes a surprisingly long way to help. And it's effectively free, as you've got some form of trigger detection monostable in there for the auto "BBL" timing, so I've always felt it's a shame it's not more widespread. Also from the beginners POV, I really liked the triangular "overscan" LEDs that showed when the trace was shifted off the screen, but those obviously require a bit of extra circuitry, so not all models got them. Secretly, I just like LEDs
