[sdiy] Which Oscilloscope to buy?

[Ingo Debus]

Am 13.12.2010 um 19:21 schrieb Matthias Herrmann:

> on both channels i got erratic deflections on the screen, even when  
> input
> set to GND. no matter what probe i use.
> every now and then i can see the actual signal i measure - just for a
> second.
>
> these are the symptoms, however i don't know whats wrong. maybe a  
> grounding
> issue? maybe i should open up the case at least, to take a look.  
> DIY, right?

I'd look at the supply voltages first. Be careful, there are some  
really high voltages in there. Don't know which Hameg you have, in  
mine the high voltage is 2000 volts!

Ingo