Actually for an EMC test lab I do not think a recognized inter laboratory comparison program exists. Only when one exists would it be required. Till then, most would opt to the intralaboratory comparison whereby they compare their own multiple lab sites if more than one exist.
Dennis Ward American TCB Certification Resource for the Wireless Industry www.atcb.com 703-847-4700 fax 703-847-6888 direct - 703-880-4841 From: [email protected] [mailto:[email protected]] On Behalf Of Kunde, Brian Sent: Tuesday, November 24, 2009 12:01 PM To: RICHARD JONES; Larry Stillings; [email protected] Subject: RE: [PSES] 3-meter Chamber Site Comparison 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. 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