Chris Pretty much our response when we say those traces, hence why myself and a facilities engineer were on a plane a few days later to visit the installation. I still have the original data, but unfortunately it is all hard copy. Also it contains too much confidential information to make public. But you can see why the power supplies were not too happy about it. .
Chris Chileshe wrote: > Andrew, > > What on earth is that? > > You wouldn't happen to have the harmonic spectra for these waveforms > would you? I believe the last time I saw a mains voltage fundamental > struggle so hard to make an impression was during my research days > at Uni when I had an erroneous switching pattern in an EPROM controlling > the triggering of power semiconductors in an ASVC (Advanced Static > VAR compensator)! And even that was symmetrical in the positive and > negative half cycles! > > Fancy having a zero crossing detector on that supply! > > Regards > > - Chris > > -----Original Message----- > From: Andrew Carson [SMTP:[email protected]] > Sent: Wednesday, January 23, 2002 1:06 PM > To: [email protected] > Subject: Re: EN 61000-3-3 compliant heater controller > > Time for some sarcasm, > > Harmonics is a total imaginary situations, > It never causes real problems > and I never recorded two attached distorted wave forms ! > > This issues had nothing to do with neutral currents, it was that > distorted wave form causing > the problem > > Suppose we could have a little competition, who's seen the worst level > of harmonic distortion, I think number 2 will take some beating. > > My two pennies worth on a wet wednesday afternoon. > > > > > > > Andrew Carson - Senior Compliance Engineer, Xyratex, UK > > Phone: +44 (0)23 9249 6855 Fax: +44 (0)23 9249 6014 > > > > ________________________________________________________________________ > This e-mail has been scanned for all viruses by Star Internet. The > service is powered by MessageLabs. For more information on a proactive > anti-virus service working around the clock, around the globe, visit: > http://www.star.net.uk > ________________________________________________________________________ << > File: harm2.jpg >> << File: harm1.jpg >> > > ________________________________________________________________________ > This e-mail has been scanned for all viruses by Star Internet. The > service is powered by MessageLabs. For more information on a proactive > anti-virus service working around the clock, around the globe, visit: > http://www.star.net.uk > ________________________________________________________________________ > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson: [email protected] > Dave Heald [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > Jim Bacher: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old > messages are imported into the new server. -- Andrew Carson - Senior Compliance Engineer, Xyratex, UK Phone: +44 (0)23 9249 6855 Fax: +44 (0)23 9249 6014 ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
