Immunity to broadband transient noise from machines is controlled (e.g., showering arc fast transient requirement). I think that would be more representative of broadband machine noise than a swept cw test such as 61000-4-3. In my opinion, an instantaneous field perhaps much higher than 3 V/m but at some specified low duty cycle repetition rate is much more representative of, and correlatable to, interactions with victim equipment than an amplitude modulated steady state carrier. Therefore I still do not find persuasive the original posting's rationale that 10 V/m should not be relaxed in broadcast bands in industrial areas.
on 3/4/03 2:15 PM, John Woodgate at j...@jmwa.demon.co.uk wrote: > > I read in !emc-pstc that Ken Javor <ken.ja...@emccompliance.com> wrote > (in <ba8a53d7.20db%ken.ja...@emccompliance.com>) about 'RADIATED > IMMUNITY REQUIREMENTS FOR EN61326' on Tue, 4 Mar 2003: >> I don't understand Mr. Allen's response. If the bands originally cited are >> reserved for broadcast, then no equipment, including industrial, should >> intentionally transmit at these frequencies. Further, it is immaterial >> whether unintentional emissions are controlled to Class A or Class B levels >> - in either case they are orders of magnitude below 3 V/m. > > True but high levels of broadband noise many nevertheless occur on a > transient time-scale in industrial areas. -- Ken Javor EMC Compliance Huntsville, Alabama 256/650-5261 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 Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
