Just to be picky Bob, there are several comb generators used to cover the EMC test range...
EUT's are likely cheaper :-) Cheers, Derek. [email protected] wrote: > If you want to compare how two test sites view a given EUT (real equipment) > then of course you need and should use an EUT. But a given EUT will not > give you the full range of frequencies needed to give you a full comparison > of two sites unless of course the EUT is a reference radiator, comb > generator, etc. > > Bob Heller > 3M EMC Laboratory, 76-1-01 > St. Paul, MN 55107-1208 > Tel: 651- 778-6336 > Fax: 651-778-6252 > ===================================== ========================================= > > > > From: Derek Walton <[email protected]> > > To: Grace Lin <[email protected]> > > Cc: "Grasso, Charles" <[email protected]>, [email protected], > [email protected] > > Date: 11/24/2009 10:21 AM > > Subject: Re: [PSES] 3-meter Chamber Site Comparison > > Sent by: <[email protected]> > > > > > > > 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]> > > - > ---------------------------------------------------------------- > 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]>
