I think this raises a parallel issue of testing methodology versus practical application.
Many devices/ boards/ add ons are tested with minimal connecting attachments i.e. conductors, other than those to power the devie and those required to make the measurement. When separate devices such as those mentioned are placed into actual service , the systems themselves become attached to conductors with sizeable electrical lengths. Here we have a computer with internal modem , external speakers, keyboard and display- all have connecting cables external to the deices which have been tested but now the environment contributes external signals which weren't present when these devices were tested indicidually. Without reducing CE or taking steps to improve conducted immunity it seems logical that emissions will be radiated by the connecting attachments and the devices become more susceptible to external interfering sources such as high ambient RF signals. Ralph Cameron EMC Consulting and Suppression of Consumer Electronics (After sale) ----- Original Message ----- From: "Doug McKean" <[email protected]> To: "EMC-PSTC Discussion Group" <[email protected]> Sent: Wednesday, June 20, 2001 8:32 PM Subject: Re: FCC + FCC = FCC? > > Building your own machine doesn't constitute you > being a PC mfr. I think that's the reading here. > > - Doug > > ----- Original Message ----- > From: "Steve Grobe" <[email protected]> > To: "'IEEE Forum'" <[email protected]> > Sent: Wednesday, June 20, 2001 2:03 PM > Subject: RE: FCC + FCC = FCC? > > > > > > If you are so am I. As are a few dozen people I know. The only way > to get > > an OS other than Windows to run well is to build your own machine. > > > > Steve > > > > -----Original Message----- > > From: Massey, Doug C. [mailto:[email protected]] > > Sent: Wednesday, June 20, 2001 2:42 PM > > To: 'IEEE Forum' > > Subject: RE: FCC + FCC = FCC? > > > > > > Just to further confuscate the issue - I once built my own home PC. > I bought > > a box, motherboard, CPU, memory, variety of ISA cards, etc. > > > > It worked so well, I built a couple or three more for family and > friends, > > and sold them to those family and friends at a good price. > > > > I didn't check radiated emissions. > > > > Am I an FCC Outlaw ? > > > > Doug Massey > > LXE, Inc. > > > > > > > > <snip> > > > > > > ------------------------------------------- > > 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: > > http://www.rcic.com/ click on "Virtual Conference Hall," > > > > > > > ------------------------------------------- > 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: > http://www.rcic.com/ click on "Virtual Conference Hall," > > ------------------------------------------- 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: http://www.rcic.com/ click on "Virtual Conference Hall,"
