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Article #748

Re: More on the Oscilloscope/Static pickup issue

#748
From: George Herold
Date: Thu, 30 Jul 2009 02:27
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On Jul 26, 8:22 am, "David L. Jones" <altz...@gmail.com> wrote:
> For those interested in my original blog on the oscilloscope probe/static
> pickup phenomenon, you might be interested to read another blog commenting
> on the issue:http://www.edn.com/blog/1700000170/post/1120046912.html
>
> All rather interesting discussion, so I quickly threw together another blog
> (#20) showing the effect again using a regular coax cable, and also busting
> the myth that it's the ground probe loop causing it.
> See my blog link below.
>
> Dave.
> --
> ---------------------------------------------
> Check out my Electronics Engineering Video Blog & Podcast:http://www.alternatezone.com/eevblog/

Dang!  Thanks for the EDN link Dave.  I like your video blogs, but
let's face it we all make mistakes once in a while.  The above link
was exactly my take on the effect the first time I saw it.  I've made
lotsa RF pickup probes by hanging loops of wire on the end of X10
'scope probes.  A one turn probe just has less inductance.  And you
should see 'about' the same voltage electro-statically.... without the
probe shorted.   Part of the problem with static discharge
measurements is reproducing the discharge.  It's hard to get the same
amount of charge each time.  I've used the piezo sparkers from butane
lighters to try and deliver high voltage sparks.  (less than ideal
sources.)  I still like my idea of changing the loop area and seeing
if the voltage decreases.

George H.

(I haven't seen your latest V-blogs.)
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From: George Herold <ggherold@gmail.com>
Newsgroups: sci.electronics.design,aus.electronics
Subject: Re: More on the Oscilloscope/Static pickup issue
Date: Wed, 29 Jul 2009 19:27:58 -0700 (PDT)
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