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" <[email protected]> >To: "Ken Javor" <[email protected]>, "Gordon,Ian" <[email protected]>, "'IEEE EMC & SAFETY PSTC'" <[email protected]> >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: [email protected] > [mailto:[email protected]]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" <[email protected]> >>To: "'IEEE EMC & SAFETY PSTC'" <[email protected]> >>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: >> [email protected] >> with the single line: >> unsubscribe emc-pstc >> >> For help, send mail to the list administrators: >> Ron Pickard: [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://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: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: [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://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: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
