James,
Since you are aware of it, you need to make sure you capture the max reading. Rob Oglesbee Radian Research (765) 449-5505 This message, and any attachments to it, may contain information that is privileged, confidential, and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, you are notified that any use, dissemination, distribution, copying, or communication of this message is strictly prohibited. If you have received this message in error, please notify the sender immediately by return e-mail or call 765-449-5500 and delete the message and any attachments. Thank you. From: Pawson, James [mailto:james.paw...@echostar.com] Sent: Thursday, March 26, 2015 11:02 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Quasi Peak - Length of Measurement Time for Final Spot Measurement? Dear group, When measuring emissions using a Quasi Peak detector are there any regulations or guidance concerning the amount of time one should dwell on a single frequency for a measurement? I know it depends on the nature of the signal. In this case, the signal of interest results in a burst of emissions of a high duty cycle followed by a long period (i.e. several minutes) of low duty cycle activity. If I use a QP detector and measure for 1 second just as the burst happens then I would get a high QP reading. If I measure in the steady state period I would get a lower QP reading. In this case, knowing the signals involves, would the intention to be to measure 1. one full representative cycle of emissions i.e. the initial burst and the low duty period after 2. during the maximum duty cycle only 3. during the steady state only I can imagine that the measurement difference between 1) and 3) in this case would be small as the level measured during the high duty period would have had time to decay down to the same level as the steady state due to the QP time constant. I'm asking this question in the context of both EN 55022 and FCC 15. Googling for "quasi peak measurement time" and similar phrases is not proving helpful Many thanks James Pawson - ---------------------------------------------------------------- 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 <mailto: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 <mailto:sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org> > For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org <mailto:j.bac...@ieee.org> > David Heald <dhe...@gmail.com <mailto:dhe...@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>
