How is the comparison performed?
From: [email protected] [mailto:[email protected]] On Behalf Of RICHARD JONES Sent: Tuesday, November 24, 2009 12:08 PM To: Larry Stillings; [email protected] Subject: RE: [PSES] 3-meter Chamber Site Comparison Under 17025 you have to do interlab comparisons anyway ;-) Rich From: Larry Stillings [mailto:[email protected]] Sent: Tuesday, November 24, 2009 11:24 AM To: [email protected] Subject: Re: [PSES] 3-meter Chamber Site Comparison Grace, If your lab is accredited under 17025, I would throw back at the design group, that you are feeling undo pressures from them which is a violation of your quality policy :-) Larry From: Grace Lin [mailto:[email protected]] Sent: Tuesday, November 24, 2009 7:01 AM To: Grasso, Charles Cc: [email protected]; [email protected] Subject: Re: [PSES] 3-meter Chamber Site Comparison 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. 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