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Article #748Re: More on the Oscilloscope/Static pickup issue
From: George Herold
Date: Thu, 30 Jul 2009 02:27
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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X-Google-Thread: a5a6238865,5bba74dd82ef2ea2 X-Google-Attributes: gida5a6238865,public,usenet X-Google-NewGroupId: yes X-Google-Language: ENGLISH,ASCII Path: arc1-ca.pugleaf.net!g2news2.google.com!postnews.google.com!m7g2000prd.googlegroups.com!not-for-mail 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) Organization: http://groups.google.com Lines: 35 Message-ID: <e4e0c1df-27fe-4a5a-b019-4730b50ba2c8@m7g2000prd.googlegroups.com> References: <%TXam.45224$3m2.4738@newsfe06.iad> NNTP-Posting-Host: 67.72.98.45 Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: posting.google.com 1248920879 2158 127.0.0.1 (30 Jul 2009 02:27:59 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: Thu, 30 Jul 2009 02:27:59 +0000 (UTC) Complaints-To: groups-abuse@google.com Injection-Info: m7g2000prd.googlegroups.com; posting-host=67.72.98.45; posting-account=_kLX7QoAAAChyHRjRDyv2ieHnlQ_-li2 User-Agent: G2/1.0 X-HTTP-UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; GTB6; .NET CLR 1.1.4322),gzip(gfe),gzip(gfe)