Re: Opinions on Oscilloscopes


RR wrote:
> "Jim Yanik" <jyanik@xxxxxxxxxx> wrote in message
> news:Xns96E0BE03CB84Djyanikkuanet@xxxxxxxxxxxxxxxxx
> > Scope input is rated *DC plus peak AC*.
> > At least that is how Tektronix specs their scopes.
> > Why are you going to put 250VAC into the TRIGGER input? The scope usually
> > has an internal trigger pickoff AFTER the attenuator,to keep trigger
> > signals small but useable. External trigger is used when you have a clean
> > reference signal to use,like H or V drive from a video generator when
> > looking at composite video,eliminates the need for a sync spearator..
>
> Down the track (lots of learning to do), I'm interested in creating and/or
> working with alternative power sources (solar to battery then inverted to
> mains power).
>
> I know I'll probably buy a lot of the equipment for doing this, but it
> always helps if you understand the circuit, especially when it stops
> working.
>
> So, if the input is 12VDC and the output is 240VAC, I suspect I'm going to
> need to put a scope on both sides at some stage.
>
> I'm just thinking ahead, and maybe I'll never need to look at mains through
> the scope.
>
> And even if I do, I may have bought a much better scope by then. Besides,
> my research indicates that differential probes are specifically designed for
> looking at high voltages (hence putting that question in my OP).
>
> thx,
> RR


If you think about the 12V DC/240V AC setup, then go thais way for a
solution: 2 ch scope with HV isolator (e.g. Tektronix A69xx or
something like this, Jim please help my memory and give the right
description).

You will not go wrong with a Tektronix, but besides all "patience" that
was recommended in buying: A good working well kept Tektronix is all
time more expensive than a worn out one that (might) need maintenance.

Keep this in mind when you compare a price offer, and don't simply go
for a low price -- your mileage may vary.


hth,
Andreas

.

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