Hi Everyone, I remember the time many years ago when I "welded" a scope probe to the circuit by accidentally connecting the ground lead to the -48 volt supply on a telecom board instead of the probe tip (got them reversed as the two nodes looked similar). Sort of embarassing.........
Doug Piotr Galka wrote: > During lab exercises at study my friend sitting next to me tried to > see with the scope the voltage at diode in thyristor circuit. > One of three phases at 3-rd floor of Electronic department dead. > The lab teacher told him to think once more what he is doing. > So he thought some time, than reconnected his scope and his thyristor > circuit to another phase and ... next phase dead. > After this second experiment whole his circuit looked like it was > painted with black spray. When he suddenly jumped back of his desk I > looked there and sow some copper paths separated from his PCB and > firing on the desk. > 10 or more years later I was travelling by train. Three students were > sitting in the same compartment. At one moment one of them began to > tell my friend's story to the others. I was seriously surprised. > > Piotr Galka > > > ----- Original Message ----- From: "Pettit, Ghery" > <[email protected]> > To: <[email protected]> > Sent: Tuesday, March 10, 2009 5:40 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! >> -- >> 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 <[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]> >> >> - >> ---------------------------------------------------------------- >> 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]> > -- ___ _ Doug Smith \ / ) P.O. Box 1457 ========= Los Gatos, CA 95031-1457 _ / \ / \ _ TEL/FAX: 408-356-4186/358-3799 / /\ \ ] / /\ \ Mobile: 408-858-4528 | q-----( ) | o | Email: [email protected] \ _ / ] \ _ / Web: http://www.dsmith.org - 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]>
