How does electrically floating copper interact with electromagnetic fields?
David ----- Original Message ----- From: "Roman, Dan" <dan.ro...@dialogic.com> To: "'Stephen Phillips'" <step...@cisco.com>; <rehel...@mmm.com>; <emc-p...@majordomo.ieee.org> Sent: Thursday, January 18, 2001 12:32 PM Subject: RE: Copper Thieving Remember that you can also cause yourself all kinds of EMI headaches if you have electrically floating copper areas or patterns on the board. It has lead to many arguments with the CAD department over the years! -- Dan -----Original Message----- From: Stephen Phillips [mailto:step...@cisco.com] Sent: Thursday, January 18, 2001 9:33 AM To: rehel...@mmm.com; emc-p...@majordomo.ieee.org Subject: Re: Copper Thieving Copper applied to the outer PCB layers, in a pattern, to even out the copper placement so the board is less likely to warp through soldering. Obviously, it would be put where there is not etch, large open areas, to somewhat offset where you might have planes of copper elsewhere on the layer. Beware of Creepage and Clearance violations (if applicable). Some PCB fab. houses have carte-blanche to add this, we don't allow that - and control it as part of our own PCB CAD instead. Best regards, Stephen At 09:15 AM 1/18/01 Thursday , rehel...@mmm.com wrote: > >Please excuse my lack of knowledge..........................what is "copper >thieving"? > > >------------------------------------------- >This message is from the IEEE EMC Society Product Safety >Technical Committee emc-pstc discussion list. > >To cancel your subscription, send mail to: > majord...@ieee.org >with the single line: > unsubscribe emc-pstc > >For help, send mail to the list administrators: > Jim Bacher: jim_bac...@mail.monarch.com > Michael Garretson: pstc_ad...@garretson.org > >For policy questions, send mail to: > Richard Nute: ri...@ieee.org > > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson: pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson: pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson: pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
