Here's a page that addreses your issue, gives a neat solution too:

http://www.geocities.com/ido_bartana/oscope.htm


Regards,

Anand Dhuru

----- Original Message -----
From: "Jan-erik S=F6derholm (QAC)" <Jan-erik.Soderholm@PAC.ERICSSON.SE>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, February 17, 2003 01:14 PM
Subject: Re: [EE]: Measuring AC mains with a O-scope.


> I think I'll go for an isolation transformer, and/or
> the 50k/100k resistors in series with the probes
> mentioned in another post.
>
> Thanks all !
> Jan-Erik.
>
> -----Original Message-----
> From: Jinx [mailto:joecolquitt@CLEAR.NET.NZ]
> Sent: den 17 februari 2003 03:46
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: Measuring AC mains with a O-scope.
>
>
> > > Does this change the way one could connect O-scope probes ?
>
> > If your scope has internal grounding... it would be blown to hell
>
> I wouldn't even think of measuring mains without an isolating
> transformer. I have a small 150VA one that goes on either the
> scope or the circuit
>
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