In a previous life -- at a company no longer around -- when our Safety Engineer quit we EMC types had to step in, and one of the very first things I did was get rid of a lethally ungrounded scope setup. It costs little to use probes rated for line voltage or better and dual channel math functions to allow proper safety grounds.
Cortland Richmond > [Original Message] > From: Pettit, Ghery <[email protected]> > To: [email protected] <[email protected]> > Date: 3/10/2009 12:43:37 PM > Subject: RE: scope probe gnd > > Or there were the old scopes where you used patch cords and banana jacks. We had what was left of the power cord for one such scope hanging in the front of the motors lab in college that showed the importance of having your setup checked before applying power. Seems the hot and ground leads to the scope from the motor being measured got reversed and the 120 VAC supply was bypassed to ground through the green wire in the power cord. For a short period of time. Then the green wire acted as a fuse. That cord was NOT repairable. And, NO, I was not the culprit. Didn't happen on my watch. > > Ghery Pettit > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of Ralph McDiarmid > Sent: Tuesday, March 10, 2009 9:35 AM > To: [email protected] > Subject: RE: scope probe gnd > > Once for me as well. I never forgot that lesson. > > > Ralph McDiarmid, AScT > Compliance Engineering Group > Xantrex Technology Inc > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of John > Woodgate > Sent: Tuesday, March 10, 2009 5:47 AM > To: [email protected] > Subject: Re: Surge testing Questions > > In message > <9d04b979323dcd428297dda95108893e0120c...@bb-corp-ex2.corp.cubic.cub>, > dated Tue, 10 Mar 2009, "Price, Edward" <[email protected]> writes: > > >What, you never had that happen?! > > Only once - so far! > -- - 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 <[email protected]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
