Re: digital devices
If you meant more than 9000 cycles per second, yes, that would be classified as a digital device under FCC Part 15. SMPS are not likely to switch at that frequency. More typically, they switch at rates above 30 kHz, well beyond audio frequencies. -- Daniel Kwok, P.Eng. Principal EMC Engineer Intetron Consulting, Inc. Vancouver, Canada Phone (604) 432-9874 Email dk...@intetron.com Web http://www.intetron.com Kim Boll Jensen wrote: > > Hi all > > I have an active loudspeaker which have been using a traditional power > supply, but will now be using switch mode power supply. Until now it > have not been under FCC part 15 and ICES 003, as fare as I understand. > > Is a switch mode power supply regarded as a digital device according to > FCC part 15 and ICES 003. It uses timing signals of more that > 9.000/10.000 cycles pr. second. > > Best regards, > > Kim Boll Jensen > Bolls Raadgivning > Denmark --- 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com 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: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
RE: digital devices
Yes, a switchmode power supply falls under FCC part 15. Also, if by "timing signals" you are referring to its switching frequency, I think you have lost a "zero" somewhere. No switchmode power supply operates in the audible frequency range around 9KHz or 10KHz (especially one used to operate a speaker); you probably meant it operates at 90KHz to 100KHz? Bob Wilson TIR Systems Ltd. Vancouver. -Original Message- From: Kim Boll Jensen [mailto:kimb...@post7.tele.dk] Sent: May 27, 2002 1:12 AM To: EMC-PSTC Subject: digital devices Hi all I have an active loudspeaker which have been using a traditional power supply, but will now be using switch mode power supply. Until now it have not been under FCC part 15 and ICES 003, as fare as I understand. Is a switch mode power supply regarded as a digital device according to FCC part 15 and ICES 003. It uses timing signals of more that 9.000/10.000 cycles pr. second. Best regards, Kim Boll Jensen Bolls Raadgivning Denmark --- 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com 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: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
