Re: DWELL TIME FOR AVERAGE DETECTORS
I would amplify on my original MOTO response and say that it is common practice to scan using peak detection, and use average detection only at frequencies where an outage condition occurs; that will drastically reduce test time. -- From: Gert Gremmen g.grem...@cetest.nl To: Ken Javor ken.ja...@emccompliance.com, Gordon,Ian ian.gor...@edwards.boc.com, 'IEEE EMC SAFETY PSTC' emc-p...@majordomo.ieee.org Subject: RE: DWELL TIME FOR AVERAGE DETECTORS Date: Tue, Apr 30, 2002, 2:46 PM At ce-test, we call this kind of answer EOE - Evidence by Experience, in addition to MOTO, the dwell time should extend any slow variations that EUT emission contains A fine and obvious example is the Microwave oven: emission varies substantially with the rotation degree of the food rotating platform, so the emission spectrum has a max and min that oscillates with rotation time. This of cpourse is valid for any detector. Emission testing DOES require knowledge of the EUT to provent EOI problems (Error of Ignorant) often caused by too much of automation in emission test labs ! Gert Gremmen ce-test, qualified testing -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Ken Javor Sent: dinsdag 30 april 2002 16:26 To: Gordon,Ian; 'IEEE EMC SAFETY PSTC' Subject: Re: DWELL TIME FOR AVERAGE DETECTORS At NASA we call this kind of answer MOTO - Master of the Obvious, but I can't think of any reason the dwell time would be other than the longer of the detector time constant or a small integer multiple of the broadband spike repetition period. -- From: Gordon,Ian ian.gor...@edwards.boc.com To: 'IEEE EMC SAFETY PSTC' emc-p...@majordomo.ieee.org Subject: DWELL TIME FOR AVERAGE DETECTORS Date: Tue, Apr 30, 2002, 4:18 AM Can anybody advise as to what dwell time should be used for an average detector when measuring a broadband noise source? This time obviously increases the total test time unnecessarily if set too high and reduces the measurement accuracy if set too low. Thanks Ian Gordon * This footnote confirms that this e-mail message has been scanned for the presence of known computer viruses by the MessageLabs Virus Control Centre. However, it is still recommended that you use local virus scanning software to monitor for the presence of viruses. * --- 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 --- 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 --- 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: DWELL TIME FOR AVERAGE DETECTORS
At ce-test, we call this kind of answer EOE - Evidence by Experience, in addition to MOTO, the dwell time should extend any slow variations that EUT emission contains A fine and obvious example is the Microwave oven: emission varies substantially with the rotation degree of the food rotating platform, so the emission spectrum has a max and min that oscillates with rotation time. This of cpourse is valid for any detector. Emission testing DOES require knowledge of the EUT to provent EOI problems (Error of Ignorant) often caused by too much of automation in emission test labs ! Gert Gremmen ce-test, qualified testing -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Ken Javor Sent: dinsdag 30 april 2002 16:26 To: Gordon,Ian; 'IEEE EMC SAFETY PSTC' Subject: Re: DWELL TIME FOR AVERAGE DETECTORS At NASA we call this kind of answer MOTO - Master of the Obvious, but I can't think of any reason the dwell time would be other than the longer of the detector time constant or a small integer multiple of the broadband spike repetition period. -- From: Gordon,Ian ian.gor...@edwards.boc.com To: 'IEEE EMC SAFETY PSTC' emc-p...@majordomo.ieee.org Subject: DWELL TIME FOR AVERAGE DETECTORS Date: Tue, Apr 30, 2002, 4:18 AM Can anybody advise as to what dwell time should be used for an average detector when measuring a broadband noise source? This time obviously increases the total test time unnecessarily if set too high and reduces the measurement accuracy if set too low. Thanks Ian Gordon * This footnote confirms that this e-mail message has been scanned for the presence of known computer viruses by the MessageLabs Virus Control Centre. However, it is still recommended that you use local virus scanning software to monitor for the presence of viruses. * --- 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 --- 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 --- 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: DWELL TIME FOR AVERAGE DETECTORS
At NASA we call this kind of answer MOTO - Master of the Obvious, but I can't think of any reason the dwell time would be other than the longer of the detector time constant or a small integer multiple of the broadband spike repetition period. -- From: Gordon,Ian ian.gor...@edwards.boc.com To: 'IEEE EMC SAFETY PSTC' emc-p...@majordomo.ieee.org Subject: DWELL TIME FOR AVERAGE DETECTORS Date: Tue, Apr 30, 2002, 4:18 AM Can anybody advise as to what dwell time should be used for an average detector when measuring a broadband noise source? This time obviously increases the total test time unnecessarily if set too high and reduces the measurement accuracy if set too low. Thanks Ian Gordon * This footnote confirms that this e-mail message has been scanned for the presence of known computer viruses by the MessageLabs Virus Control Centre. However, it is still recommended that you use local virus scanning software to monitor for the presence of viruses. * --- 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 --- 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
