Most scopes I've used earth the probe ground-lead through their mains power cord, so likely no need to attach the ground clip to anything when probing mains voltage.
Ralph McDiarmid, AScT Compliance Engineering Group Xantrex Technology Inc From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of John Woodgate Sent: Monday, March 09, 2009 2:00 PM To: emc-p...@ieee.org Subject: Re: Surge testing Questions In message <0ed66cd2c9bd0a459d54fb9119a60567e0b...@mailserver.lecotc.com>, dated Mon, 9 Mar 2009, "Kunde, Brian" <brian_ku...@lecotc.com> writes: >With a grounded Neutral, 0º and 180º is not the zero crossing point >(zero voltage potential to earth ground) but the 270º angle. Worst case >would be the 90º angle which would be Peak-Peak plus the Positive Surge >pulse. Would you like to re-consider that. The 0 V line on the scope IS 0 V, between the hot tip and whatever the ground clip is connected to. If the neutral is earthed, it doesn't matter which one the ground clip is connected to; 0 V is 0 V. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Things can always get better. But that's not the only option. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@ptcnh.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@ptcnh.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
