Hi Alex, As a start I could give you some guidelines that may be used to encompass in your list (don't know though if all may be applicable to the EMC requirements you may envisage):
. Track all signal lines on the board, avoid 'flying leads' across the board. . Ensure proper signal returns; if necessary include isolation to define preferred current paths. . Keep interference paths segregated from sensitive circuits. . Minimize ground inductance with thick gridding or ground plane(s), use power plane where possible. . Minimize enclosed loop areas in high current, high di/dt or sensitive circuits. . Minimize surface areas of nodes with high dv/dt. . Minimize HF and RF track length and component leadout length. . Use wide tracks for power lines and decouple at local boundaries (use 'low Q' RLC filters). . Avoid overlapping power planes. . If possible make tracking run orthogonal between adjacent layers. . Use track mitring (bevelling the edges at corners) and avoid track stubs. . Do not leave any floating conductor areas, if possible connect to ground plane. . On sensitive components and terminations use surrounding guard ring and ground fill, where possible. . If used, only connect the guard ring to ground at a single point and make no other use of it. . Avoid slit apertures in the PCB layout, particularly in ground planes or near current paths. Concerning safety make sure the creepage and clearance distances are conform the norms (e.g IEC 60950, 61010) Greetings, Arno van Kesteren EMC and Electrical Engineer European Southern Observatory, Munich ----- Original Message ----- From: "Alex McNeil" <[email protected]> To: <[email protected]> Sent: Wednesday, March 06, 2002 3:46 PM Subject: EMC and Safety PCB Reviews > > Hi Guys, > > I am being asked to review PCB's for EMC (and Safety) acceptance. I was > going to try and collate a check list then I thought of this wonderful > forum!! > > Does any kind person have such a thing as an EMC PCB Design Check list? > Does any kind person have such a thing as an Safety PCB Design Check list? > > Kind Regards > Alex McNeil > Principal Engineer > Tel: +44 (0)131 479 8375 > Fax: +44 (0)131 479 8321 > email: [email protected] > > > ------------------------------------------- > 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: > Ron Pickard: [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: > http://ieeepstc.mindcruiser.com/ > Click on "browse" and then "emc-pstc mailing list" > ------------------------------------------- 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: Ron Pickard: [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: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
