Interesting topic! Completely agree with Brent!.
I would only add the "quality" of the signal can also contribute to the variation - by that I mean if there is any kind of modulation on the signal then that will contribute to the measurement difficulties. It is also not unusual for a lab to sit on a signal if the signal has a noted time variance (this is from experience). On Sun, Dec 5, 2021 at 11:46 AM Amund Westin <am...@westin-emission.no> wrote: > This message originated outside of DISH and was sent by: > owner-emc-p...@listserv.ieee.org > > > > Some weeks ago I went to a test lab as an observer on a CE marking project > (IT product). > > I participated on the radiated emission testing and some frequencies were > above the limit line during the scan (peak measurement). Later on, the > Quasi-Peak measurement lowered the values significant and therefore with > the result Passed. > > Later on, I was told that they continued the testing by 10-15 minutes and > was logging the maximum Quasi Peak value (repetitive QP meas) on spike with > the highest value. During these 15 minutes, one or two QP measurement was > above the limit and the result was changed from Passed to Failed. > > I have not seen this test procedure before. I’m familiar with just one QP > measurement on each frequency and not Max Hold QP on each for 10-15 > minutes. > > Anyone who have experienced the same? Is it a CISPR procedure or just some > overzealous lab engineers? > > > > Best regards > > Amund > > > > > > > > > > > > > > > > > > > > > > > > > > > - > ---------------------------------------------------------------- > > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to < > emc-p...@ieee.org> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site at > http://product-compliance.oc.ieee.org/ can be used for graphics (in > well-used formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) <http://www.ieee-pses.org/list.html> > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher <j.bac...@ieee.org> > David Heald <dhe...@gmail.com> > -- Charles Grasso Dish Technologies (c) 303-204-2974 (h) 303-317-5530 (e ) charles.gra...@dish.com (e2) chasgra...@gmail.com - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
