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Article #1006Re: An unusual Oscilloscope phenomenon
From: Phil Hobbs
Date: Thu, 25 Jun 2009 17:48
Date: Thu, 25 Jun 2009 17:48
53 lines
3262 bytes
3262 bytes
John Larkin wrote: > On Wed, 24 Jun 2009 21:42:07 -0700, <castlebravo242@att.net> wrote: > >> "David L. Jones" <altzone@gmail.com> wrote in message >> news:h8B0m.53620$FI5.3564@newsfe12.iad... >>> Check out a rather unusual phenomenon you can see on your oscilloscope in >>> my latest blog (#14): >>> http://www.alternatezone.com/eevblog/ >>> See if you can get it to happen on your scope! >>> I'll offer a free subscription to my blog for the best screen shot posted >>> :-> >>> >>> Oh, and the probe doesn't have to be shorted either. >>> >>> Have fun. >>> Dave. >>> -- >>> ================================================ >>> Check out my Electronics Engineering Video Blog & Podcast: >>> http://www.alternatezone.com/eevblog/ >>> >>> >> When I worked a Century Data we had a problem with our new reel to reel >> vaccuum column tape drive when ever someone would walk by the drive when it >> was reading it would get data errors. The problem was that the shield on the >> cable from the heads to the preamp was grounded on both ends. >> >> Bob >> > > That's usually the best way to ground shields. > > John > > Depends. With floating transducers and shielded twisted pair, it's best to ground the shield only at the transducer end. That way any capacitive imbalance doesn't produce any currents, because the shield is at the transducer's idea of ground. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
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X-Google-Thread: a5a6238865,2fb4482ba391e6 X-Google-Attributes: gida5a6238865,public,usenet X-Google-NewGroupId: yes X-Google-Language: ENGLISH,ASCII-7-bit Path: arc1-ca.pugleaf.net!g2news2.google.com!news3.google.com!news1.google.com!border1.nntp.dca.giganews.com!border2.nntp.dca.giganews.com!nntp.giganews.com!backlog2.nntp.dca.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Thu, 25 Jun 2009 12:48:34 -0500 Date: Thu, 25 Jun 2009 13:48:35 -0400 From: Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.21) Gecko/20090403 SeaMonkey/1.1.16 Mnenhy/0.7.6.666 MIME-Version: 1.0 Newsgroups: sci.electronics.design,aus.electronics Subject: Re: An unusual Oscilloscope phenomenon References: <h8B0m.53620$FI5.3564@newsfe12.iad> <C5D0m.1651$vO4.300@flpi145.ffdc.sbc.com> <n41645hvv4ia1uqa1cnbriilvg4vg1td2a@4ax.com> In-Reply-To: <n41645hvv4ia1uqa1cnbriilvg4vg1td2a@4ax.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Message-ID: <z_udncS2Q9vvJd7XnZ2dnUVZ_odi4p2d@supernews.com> Lines: 53 X-Trace: sv3-qyECNtMVvh9mHSR4M5kQi6Ji/qExp9EeEp7vlFQUf0+yW2fUBVkSh55ljHG/Wl0f1VxwcmDOHaL5XjB!5ebOGtGXdqoHb1hmgaTq/fQ0tb7/OMr6vEKeNZrrq94aSQOdSSaXv7a0aUGYJUzA0bBNuwlA+kVx!4R7fgm0eGDg= X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.39 X-Original-Bytes: 2993