Hi Grace, I reaffirm my stance that you should test a real EUT. To start, one with minimum cables, but a real EUT nonetheless.
Sincerely, Derek. Grace Lin wrote: > Site comparison is requested by our design group. They feel it is too > difficult to obtain a passing data from my lab. -Grace > > On 11/23/09, Grasso, Charles <[email protected]> wrote: > >> Hello Grace, >> >> >> >> The first question is - what do you mean by a site comparison? If by >> that you mean >> how well a site performs to established site attenuation - well then all >> you need is >> to have the site run the test. >> >> >> >> If, by site comparison, you mean comparing one site against another then >> you actually >> have a more difficult problem as there are several variables that you >> will need to account for. >> >> >> >> What has proved very successful is to use a standard calibrated source >> and provide the test >> lab with a detailed set of instructions on how to take the measurement. >> This methodology >> focuses on the site quality only! (Dell and HP are examples) >> >> >> >> NIST has a very precise site source (the original design was done by >> Galen Koepke from NIST I believe) HP developed their own source and >> reported that >> they reduced site to site variability to about 2dB!! I cannot remember >> the >> individual that designed the source and did the work maybe someone from >> this list >> can help! >> >> >> >> Best Regards >> Charles Grasso >> Compliance Engineer >> Echostar Communications >> (w) 303-706-5467 >> (c) 303-204-2974 >> (t) [email protected] <mailto:[email protected]> >> (e) [email protected] <mailto:[email protected]> >> (e2) [email protected] <mailto:[email protected]> >> >> ________________________________ >> >> From: [email protected] [mailto:[email protected]] On Behalf Of >> [email protected] >> Sent: Friday, November 20, 2009 11:06 AM >> To: [email protected] >> Subject: Re: [PSES] 3-meter Chamber Site Comparison >> >> >> >> >> If you can spare time why not try both an EUT and a 'comb' RF source? >> It would make a nice cross-check. >> ________________________________________________________________________ >> _____________ >> >> Ralph McDiarmid | Schneider Electric | Renewable Energies Business >> | CANADA | >> >> >> >> >> From: >> >> Grace Lin <[email protected]> >> >> To: >> >> [email protected] >> >> Date: >> >> 11/20/2009 04:56 AM >> >> Subject: >> >> [PSES] 3-meter Chamber Site Comparison >> >> >> >> ________________________________ >> >> >> >> >> Dear Members, >> >> I am asked to perform site comparison and would like to hear your >> comments. >> >> Should I purchase a signal source? If yes, do you have any reference? >> I do have a COM-POWER comb generator and don't know if it is good enough >> for the purpose. >> >> Should I use an EUT for site comparison? >> >> Thank you. >> >> Best regards, >> Grace Lin >> >> >> >> >> >> >> - >> ---------------------------------------------------------------- >> 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.ieeecommunities.org/emc-pstc >> Graphics (in well-used formats), large files, etc. can be posted to that >> URL. >> >> Website: http://www.ieee-pses.org/ >> Instructions: http://listserv.ieee.org/request/user-guide.html >> List rules: http://www.ieee-pses.org/listrules.html >> >> For help, send mail to the list administrators: >> Scott Douglas <[email protected]> >> Mike Cantwell <[email protected]> >> >> For policy questions, send mail to: >> Jim Bacher <[email protected]> >> David Heald <[email protected]> >> >> >> ________________________________________________________________________ >> This email has been scanned for SPAM content and Viruses by the MessageL >> abs Email Security System. >> ________________________________________________________________________ >> >> >> - >> ---------------------------------------------------------------- >> 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.ieeecommunities.org/emc-pstc >> Graphics (in well-used formats), large files, etc. can be posted to that >> URL. >> >> Website: http://www.ieee-pses.org/ >> Instructions: http://listserv.ieee.org/request/user-guide.html >> List rules: http://www.ieee-pses.org/listrules.html >> >> For help, send mail to the list administrators: >> Scott Douglas <[email protected]> >> Mike Cantwell <[email protected]> >> >> For policy questions, send mail to: >> Jim Bacher <[email protected]> >> David Heald <[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.ieeecommunities.org/emc-pstc >> Graphics (in well-used formats), large files, etc. can be posted to that >> URL. >> >> Website: http://www.ieee-pses.org/ >> Instructions: http://listserv.ieee.org/request/user-guide.html >> List rules: http://www.ieee-pses.org/listrules.html >> >> For help, send mail to the list administrators: >> Scott Douglas <[email protected]> >> Mike Cantwell <[email protected]> >> >> For policy questions, send mail to: >> Jim Bacher: <[email protected]> >> David Heald: <[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.ieeecommunities.org/emc-pstc > Graphics (in well-used formats), large files, etc. can be posted to that URL. > > Website: http://www.ieee-pses.org/ > Instructions: http://listserv.ieee.org/request/user-guide.html > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <[email protected]> > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher: <[email protected]> > David Heald: <[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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
