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.
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]>
