measure AC mains with oscilloscope

[Fred Abse]

On Wed, 28 Dec 2011 20:32:36 -0800, George Herold wrote:

Phil's been pretty good in my opinion. (What he's said has been 'spot on'.
No?) He's almost like a door guard here at SEB.

Cerberus?

I'd agree with that, George. Phil can be (mostly is) objectionable and
rude, but his pronouncements on technical matters are usually correct and
to the point.

--
"For a successful technology, reality must take precedence
over public relations, for nature cannot be fooled."
(Richard Feynman)

 

[Jamie]

fungus wrote:

On Dec 29, 5:32 am, George Herold <gher...@teachspin.com> wrote:

Phil's been pretty good in my opinion.
(What he's said has been 'spot on'. No?)


I'm not questioning his electronics knowledge,
but this is 'basics' so people should be allowed
to ask questions, no?

And the insults part. fungus=XXXX

Was that 'spot on'?


He's almost like a door guard here at SEB.


You seem to know him. Maybe you can explain
where I went wrong... what causes doggy to bite.

Don't worry about Phil. I would bet if his better

half even glanced at him slightly, he would heed to
the subservient level of obedience.

Generally people like Phil need a place to unload after
being around incompetence all day. It does
not mean you are one of them.

And remember, every one has a different scale of where
the line is drawn, this is my opinion only.

I am sure Phil will be blasting away at me after this one!

Jamie

 

[Tom Del Rosso]

John Larkin wrote:

There's no problem with touching a 10:1 probe to the high side of the
AC line. I do that all the time. If you scope is grounded, and neutral
is close to ground, that should get you close to the actual waveform.

When last I did that with an analog scope, I saw a near-sine that was
composed of a series of straight lines. Each line was fairly long, so it
took only about 10 to make a full wave. It looked like a vector drawing.


--

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[Michael A. Terrell]

Tom Del Rosso wrote:

John Larkin wrote:
?
? There's no problem with touching a 10:1 probe to the high side of the
? AC line. I do that all the time. If you scope is grounded, and neutral
? is close to ground, that should get you close to the actual waveform.

When last I did that with an analog scope, I saw a near-sine that was
composed of a series of straight lines. Each line was fairly long, so it
took only about 10 to make a full wave. It looked like a vector drawing.

Try looking at the ground connection some time, to see the noise
imposed on the neutral. It's really nasty on three phase, with the
harmonics adding in the neutral.


--
You can't have a sense of humor, if you have no sense.