On 10:19 AM 9/10/2002 +1100, Thomas said: >Sometimes that's just not possible though. >I've recently finished a double sided PCB with allot of controlled impedance >tracks on one side widely spaced to prevent xtalk and to prevent arcing (its >a surge protection device) with a solid ground plane on the other side. > >My board house has not complained (yet). > >Tom.
Even on such a board there are often things that can be done to help even copper distribution. In areas widely spaced from the active tracks you can place copper balancing squares or even a hatched polygon. When I fully specify a production panel (break offs, tooling strips etc) I will usually say the that the production tooling is uncontrolled space and the board house is free to add copper balancing features. Some will, some won't. Those that do usually add squares along the tooling strip. I have not had a board house complain for years about unbalanced copper density, but I have had some thank me for making an effort to balance the copper. Ian Wilson * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
