> From [email protected] Fri Mar 12 02:24:22 PST 1999 > Received: from hpsdlo.sdd.hp.com (hpsdlo-sw.sdd.hp.com [15.26.112.11]) by > hpsdlfsg.sdd.hp.com with ESMTP (8.7.6/8.7.3 TIS 5.0/sdd epg) id CAA28353 for > <[email protected]>; Fri, 12 Mar 1999 02:24:21 -0800 (PST) > Received: from ruebert.ieee.org (ruebert.ieee.org [199.172.136.3]) > by hpsdlo.sdd.hp.com (8.8.6 (PHNE_14041)/8.8.5btis+epg) with ESMTP id > CAA00549 > for <[email protected]>; Fri, 12 Mar 1999 02:24:20 -0800 (PST) > Received: by ruebert.ieee.org (8.8.8/8.8.8) > id EAA14981; Fri, 12 Mar 1999 04:38:08 -0500 (EST) > Message-ID: <[email protected]> > From: "Crabb, John" <[email protected]> > To: "'[email protected]'" <[email protected]>, [email protected] > Subject: RE: Leakage Current Measurements > Date: Fri, 12 Mar 1999 09:35:40 -0000 > MIME-Version: 1.0 > X-Mailer: Internet Mail Service (5.0.1460.8) > Content-Type: text/plain > Sender: [email protected] > Precedence: bulk > Reply-To: "Crabb, John" <[email protected]> > X-Resent-To: Multiple Recipients <[email protected]> > X-Listname: emc-pstc > X-Info: Help requests to [email protected] > X-Info: [Un]Subscribe requests to [email protected] > X-Moderator-Address: [email protected] > > We use a Yokogawa 3226 Universal Leakage Current Tester > together with a 3227 Test Box. The meter has both an "AC" and > an "AC+DC" current range, and switchable 1K, 1.5K, and 2K > input resistance. The test box has a polarity and an on-off switch to > simplify testing, and has a US mains socket into which we plug the > product to be tested, using a cord with the earth pin cut off, which we > can also readily reverse. > UL and CSA seem quite happy to use this meter when they come here > to review our products. > We also have a Simpson 229-2 which is there to be used if the other > meter is being calibarated, and it gives similar results to > the Yokogawa. > I asked UL to bring their Simson 228 meter here during a recent > investigation, to compare results. It read a little higher than the > Yokogawa, but UL were happy for us to continue using the Yokowawa. > They certainly do not insist on the use of the Simpson 228. > > I had some information on a Hioki Model 3155-01 Leakage Current > Tester, which is claimed to meet the latest IEC 950 requirements, but > I can't readily lay my hands on it. IT WAS EXPENSIVE. > It is a digital meter, could also measure the voltage/current going > to the equipment, and had pluggable networks for 950 and medical > equipment measurements. > > >From time to time when I am doing leakage current measurements, > I check that the results I get ARE VERY SIMILAR to the reading I > get if I just put the meter in series with the ground conductor of the > product. (And they are always almost identical) Could somebody > explain why this much simpler method is not used ? > > John Crabb, Development Excellence (Product Safety) , > NCR Financial Solutions Group Ltd., Kingsway West, Dundee, Scotland. DD2 > 3XX > E-Mail :[email protected] > Tel: +44 (0)1382-592289 (direct ). Fax +44 (0)1382-622243. VoicePlus > 6-341-2289. > > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to [email protected] > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to [email protected], > [email protected], [email protected], or > [email protected] (the list administrators). > >
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