I can answer the first question: A question came up that I can't answer w/o a copy of Part 47. Does the FCC report require Quasi-Peak (QP) data, or just Avg and Peak. When do peak readings trigger the need to report QP? I'm pretty sure Part 15 has AVG and QP limits listed.
CHAS] The selection depends on the Freq band, So for example if testing between 30MHz and 1GHz - the spec is stated AS XXdbuV/m at 3m using a QP detector. Above 2G the spec is listed as AVG (with a max peak reading so technically both). So..If the peak readings are BELOW the spec limits, its has been common to state that the EUT is compliant. If on the other hand the peak readings EXCEED the specs as stated then the QP/AVG data requirements kick in. Next was what sort of margin is expected in order to pass CE emissions requirements (CISPR 16 or 32)? Memory serves that one wants 3dB of margin, but memories can be imperfect! CHAS] I dont recall that there is a margin expectation in CISPR32 or in the FCC Part 47 or in ANSI C63.4. What I DO remember is CISPR (Now EN) 22 (55022) that required multi-sample testing if the original sample was within 3dB of the spec so as to establish a statistical metric of the EMI performance of the EUT. On Sat, Jul 8, 2023 at 8:24 AM John Woodgate <[email protected]> wrote: > * This message originated outside of DISH and was sent by: [email protected] > <[email protected]> * > ------------------------------ > > > > ====================================================================================== > Best wishes John Woodgate OOO-Own Opinions Only > www.woodjohn.uk > <http://www.woodjohn.uk> > Rayleigh, Essex UK > > I hear, and I forget. I see, and I remember. I do, and I understand. Xunzi > (340 - 245 BC) > > > > > -------- Forwarded Message -------- > Subject: Re: [PSES] FCC Part B questions > Date: Sat, 8 Jul 2023 07:07:26 +0100 > From: John Woodgate <[email protected]> <[email protected]> > Organisation: J M Woodgate and Associates > To: Brian Gregory <[email protected]> <[email protected]> > > I can't answer your first question, but for the second question you should > look at EN 50715, which advises that you should determine the margin by > applying statistical methods to data obtained from measurements of similar > products. It isn't safe to assume 3 dB. > > ====================================================================================== > Best wishes John Woodgate OOO-Own Opinions Only > www.woodjohn.uk > <http://www.woodjohn.uk> > Rayleigh, Essex UK > > I hear, and I forget. I see, and I remember. I do, and I understand. Xunzi > (340 - 245 BC) > > > On 2023-07-08 05:38, Brian Gregory wrote: > > > Hi there, > > A question came up that I can't answer w/o a copy of Part 47. > Does the FCC report require Quasi-Peak (QP) data, or just Avg and Peak. > When do peak readings trigger the need to report QP? I'm pretty sure Part > 15 has AVG and QP limits listed. > > Next was what sort of margin is expected in order to pass CE emissions > requirements (CISPR 16 or 32)? Memory serves that one wants 3dB of margin, > but memories can be imperfect! > > "Colorado" Brian > 720-450-4933 > - > ---------------------------------------------------------------- > > 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 < > [email protected]> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > <http://www.ieee-pses.org/emc-pstc.html> > > Website: http://www.ieee-pses.org/ > <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 > <http://www.ieee-pses.org/listrules.html> > > For help, send mail to the list administrators: > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher <[email protected]> > David Heald <[email protected]> > ------------------------------ > > To unsubscribe from the EMC-PSTC list, click the following link: > https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> > > - > ---------------------------------------------------------------- > > 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 < > [email protected]> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > <http://www.ieee-pses.org/emc-pstc.html> > > Website: http://www.ieee-pses.org/ > <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 > <http://www.ieee-pses.org/listrules.html> > > For help, send mail to the list administrators: > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher <[email protected]> > David Heald <[email protected]> > ------------------------------ > > To unsubscribe from the EMC-PSTC list, click the following link: > https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> > -- Charles Grasso Dish Technologies (c) 303-204-2974 (w) 303-706-5467 (h) 303-317-5530 (e ) [email protected] (e2) [email protected] - ---------------------------------------------------------------- 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 <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html 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: Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
