Return-Path: Received: from mtain-di01.r1000.mx.aol.com (mtain-di01.r1000.mx.aol.com [172.29.64.5]) by air-mc01.mail.aol.com (v129.4) with ESMTP id MAILINMC013-a8514d53baa4fd; Thu, 10 Feb 2011 05:15:00 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-di01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 878693800008B; Thu, 10 Feb 2011 05:14:59 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PnTXB-0004tV-LX for rs_out_1@blacksheep.org; Thu, 10 Feb 2011 10:13:57 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PnTXB-0004tM-92 for rsgb_lf_group@blacksheep.org; Thu, 10 Feb 2011 10:13:57 +0000 Received: from mhost02c.leeds.ac.uk ([129.11.76.154]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PnTX9-0006ok-Ng for rsgb_lf_group@blacksheep.org; Thu, 10 Feb 2011 10:13:57 +0000 Received: from APOLLO1.ds.leeds.ac.uk (apollo1.leeds.ac.uk [129.11.5.4]) by mhost02c.leeds.ac.uk (8.14.4/8.14.4) with ESMTP id p1AADns8022630 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NOT) for ; Thu, 10 Feb 2011 10:13:49 GMT Received: from HERMES8.ds.leeds.ac.uk ([fe80::c078:16b5:73cf:6fbc]) by APOLLO1.ds.leeds.ac.uk ([129.11.5.4]) with mapi; Thu, 10 Feb 2011 10:12:13 +0000 From: Chris Trayner To: "rsgb_lf_group@blacksheep.org" Date: Thu, 10 Feb 2011 10:12:12 +0000 Thread-Topic: LF: RE: how to get ground rod ressitance low Thread-Index: AcvJCvwzBTfqzz7ISKOlEqvQlzl/Cg== Message-ID: References: <4D53AE84.6932.312944@jurgenb2.3sdesign.de> In-Reply-To: Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US, en-GB MIME-Version: 1.0 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: RE: how to get ground rod ressitance low Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=TO_ADDRESS_EQ_REAL autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G x-aol-sid: 3039ac1d40054d53baa24126 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) Hi Rik and others, > measuring DC resistance is not very meaningfull Absolutely! The soil charges up. It's quite fun to do. Take your multimeter into the garden, put it on the= Ohms range and put the meter prods into the soil some distance apart. The resistance starts quite low then rises. When it's tailed off, or you've got bored, switch your multimeter to the= Volts range. You see a voltage from the secondary battery you've charged up in the soil= ; it fades to zero volts quite soon. 73, Chris G4OKW =20 ----------------------- Dr Chris Trayner School of Electronic & Electrical Engineering, The University of Leeds, Leeds LS2 9JT, United Kingdom Tel: +44 113 34 32053 Fax: +44 113 34 32032