Amund, My minimum criteria and recommendation has always been at least 6dB. However, how many engineering managers, upon finding a 1.5 dB margin in their favor, rule "ship it"!
Education (repeated brainwashing of as many 'powerful company managers) has been my response;-- but that often takes time. In those cases, there is a written memoranda signed by me explaining why that kind of approach is not correct. taniagr...@msn.com ----- Original Message ----- From: <am...@westin-emission.no> To: <emc-p...@majordomo.ieee.org> Sent: Sunday, December 16, 2001 11:20 AM Subject: SV: EMI guard bands > > Cecil, > > When thinking of EMI guard band (margins), I put the following into mind: > 1. variation in production (a couple of dB) > 2. uncertainly during measurements (5-6 dB at lower frequencies like 30MHz) > 3. variation from labs to labs (I don't know ....4-6 dB ?? ) > > I think 6-8dB should give you a good feeling. > > Amund > > > > > > > -----Opprinnelig melding----- > Fra: owner-emc-p...@majordomo.ieee.org > [mailto:owner-emc-p...@majordomo.ieee.org]Pa vegne av > cecil.gitt...@kodak.com > Sendt: 10. desember 2001 13:46 > Til: emc-p...@majordomo.ieee.org > Emne: EMI guard bands > > > > From: Cecil A. Gittens > > I am in the process of putting a document together for products that are > tested for Radiated & Conducted Emissions > that should have a Guard-band of 6 dB for FCC or CISPR22 class A or B. > Does it depend if the product is class A or B? > Does anyone have any pointers or suggestions? > > Thanks. > > > ------------------------------------------- > 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: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson: pstc_ad...@garretson.org > Dave Heald davehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > 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. > > > ------------------------------------------- > 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: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson: pstc_ad...@garretson.org > Dave Heald davehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > 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. > ------------------------------------------- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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.
