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Article #5359Re: St Elmo's Fire - 100 v/m ?
From: Tom Bruhns
Date: Wed, 25 Jul 1990 16:47
Date: Wed, 25 Jul 1990 16:47
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>|> potential as the earth. A foot from your nose, the air is at a potential >|> of +200V. >| >|Just curious... >|Why can't this be measured with a DVM? >Because that 10 megohm input DVM is also a much better conductor than air. >Maybe with something like an electrometer... ?? I believe the folk who measure this (e.g., atmospheric physicists) use an instrument called a "field mill." A prof whose office was next to mine used to build them and drop them through thunder storms.
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!know!samsung!zaphod.mps.ohio-state.edu!sdd.hp.com!hp-pcd!hplsla!tombReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!know!samsung!zaphod.mps.ohio-state.edu!sdd.hp.com!hp-pcd!hplsla!tomb From: tomb@hplsla.HP.COM (Tom Bruhns) Newsgroups: sci.electronics Subject: Re: St Elmo's Fire - 100 v/m ? Message-ID: <5170083@hplsla.HP.COM> Date: 25 Jul 90 16:47:59 GMT References: <5498.26aba906@cerritos.edu> Organization: HP Lake Stevens, WA Lines: 13