Hi Folks, I was keeping quiet.... but you know sometimes it's just too much.
Almost all measurements I take in my lab use a differential scope probe. The exception is when High voltages are involved. And I dont mean the rinky dink two probes/scope math function either.... With diff probes I can connect anywhere to anywhere and measure it. I never cringe hooking up the 0 volt reference side.... never sparks.... Give one a try, you will never go back. Derek Walton Cortland Richmond wrote: > 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]> > - 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]>
