Jeffrey,
You are correct. The standards do not address the usage of multiple
antennas. We have not participated in any Round Robin testing multiple
antennas in the test chamber, so I am not exactly sure what the possible
effects would be in terms of getting accurate and/or repeatable results.
From my experience, I would guess that any object in an absorption chamber
that does not absorb, will affect things like repeatability, and
uncertainty in your measurements. It would be another question to ask just
how much? and is it worth considering?
Best Regards,
Scott Mee
Johnson Controls Inc.
Automotive Systems Group
EMC Product Compliance
616.394.2565
scott@jci.com
|-+-
| | Jeff.Greilich@asl-tk.c|
| | om|
| | Sent by: |
| | owner-emc-pstc@majordo|
| | mo.ieee.org |
| | |
| | |
| | 04/16/02 02:15 PM |
| | Please respond to |
| | Jeff.Greilich |
| | |
|-+-
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|To: emc-p...@ieee.org
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|cc:
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|Subject: Question concerning antenna carousels, their usefulness,
credibility of data collected, and..|
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Et Al:
I am soliciting opinions from anyone who has attempted using an antenna
carousel that aids in doing automated EMI measurements under CISPR 25.
The CISPR 25 specification provides requirements in terms of spacings of
the antenna elements from the walls of the room, size of the room, use
of anechoic material, etc but not pertaining to adjacent antennas. In
addition, certain automotive companies place further requirements in
terms of expected performance relative to Round Robin results of a Test
Artifact taken at several labs before allowing a new lab to be listed as
AEMCLRP accredited.
I look forward to hearing from those involved in the Automotive Industry
who have information either good/bad relating to this issue.
Regards,
Jeffrey W. Greilich
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