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Article #874Re: An unusual Oscilloscope phenomenon
From: Michael A. Terrell
Date: Tue, 07 Jul 2009 12:30
Date: Tue, 07 Jul 2009 12:30
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terryc wrote: > > On Mon, 06 Jul 2009 17:38:19 -0700, Joerg wrote: > > > terryc wrote: > >> On Mon, 06 Jul 2009 12:05:37 -0700, Joerg wrote: > >> > >> > >> > >>> In a welding environment 800V may not be good enough. > >> > >> Which "welding" environments did you have in mind? > >> > >> > > The usual. >100 amps, electrodes touching, arcing, getting stuck once in > > a while, thick cables floating around the room, ground potential of > > equipment bouncing, and so on. I once told someone to get his ham radio > > gear out before we start welding a broken gate. "Nah, this stuff is > > tough" ... "Better get it outta here" ... "No, really, it's ok, just get > > cracking on the gate" ... "Ok then" ... bzzt, bzzt, bzzzzzzzzzzt ... > > beep ... *PHUT* > > Umm, have you ever put a volt meter across the cables? > I was under the impression that that stuff matched the telephone and was > in the vicinity of 40volts. > > I politely suggest that if it was around 800volts, then black and crispy > would be a welder who made the wrong circuit. > > Hint, it is the current that causes the field. Its the collapsing field that generates the HV spikes that can, and does knock careless welders on their asses. -- You can't have a sense of humor, if you have no sense!
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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!news2.google.com!border1.nntp.dca.giganews.com!border2.nntp.dca.giganews.com!nntp.giganews.com!backlog2.nntp.dca.giganews.com!nntp.earthlink.com!news.earthlink.com.POSTED!not-for-mail NNTP-Posting-Date: Tue, 07 Jul 2009 07:30:39 -0500 Message-ID: <4A533FE6.9E275BA8@earthlink.net> Date: Tue, 07 Jul 2009 08:30:30 -0400 From: "Michael A. Terrell" <mike.terrell@earthlink.net> Organization: http://home.earthlink.net/~mike.terrell/index.html Skype: michael.a.terrell Flikr: http://www.flickr.com/photos/materrell/ X-Mailer: Mozilla 4.8 [en] (Windows NT 5.0; U) X-Accept-Language: en 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> <z_udncS2Q9vvJd7XnZ2dnUVZ_odi4p2d@supernews.com> <u4k745pit2pm2qep1k9apmcgda9ugb1uqe@4ax.com> <pan.2009.06.30.18.25.22.512231@example.net> <q2lk45pnpbb3esgo2bi6pp2f85p977qbjb@4ax.com> <7av4ckF2168qeU4@mid.individual.net> <sjnk459n6lgmicl8c1dflfutbghqp20tfp@4ax.com> <4a4bab66.2595149687@news.planet.nl> <7b1sftF1sbgmcU1@mid.individual.net> <4a4bdde5.2608076625@news.planet.nl> <7b2an2F1vorf3U1@mid.individual.net> <4a4e83ad.2781589312@news.planet.nl> <7bf082F232f2kU1@mid.individual.net> <4a527fd4$0$68552$c30e37c6@pit-reader.telstra.net> <7bfjnvF22lu8vU1@mid.individual.net> <4a533ccd$0$68552$c30e37c6@pit-reader.telstra.net> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-NewsProxy: 1.2.5 Lines: 39 X-Usenet-Provider: http://www.giganews.com NNTP-Posting-Host: 24.110.34.161 X-Trace: sv3-kewVhmONe13Tb3ikrx43JzbpjI2K4m8LNXD9h++5Rar1gG+Pxf3khMJ5v3BE5i/ygu3t0DpxXfVJa97!gNA7/FImvSGs6wodw5nZscicCfrnpH4LWiUhAZtc+0dGOHS+hV+azkXt/toxTB4nWvaAvNO75I3f!lgjFNaq4Wb9OPPGpBjA= 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: 3349