I like the 7405a EMC SA to 26.5 GHz. We have a compact 3m. I've added cones
and tiles to make a semi FAC. While the NSA is just about in, it is somewhat
different than the OATS we have. How do you do a NSA without the 4m scan?
Think out of the box!
It is still "not valid," but for engineer work, it is close enough.
Note, when re-assembling the chamber, be sure to clean the edges of the panels
where the electrical contact is to be made. Some Cu tape and Cu wool will be
very useful too.
How to know? Many years ago, I ran across an old piece of equipment for
testing seams such as these. It applied an AC current via a couple of
connections, one each for the far diagonal corners. Then had a battery powered
magnetic pickup from what I could tell, and an analog meter reading, like an
S-meter. Get that pickup near an amonaly in the field and the meter would
swing. Loose hats and flats (that the joints between panels) would swing the
meter a lot. clean the joint and tighten, meter would settle down.
Attitude is Mind over Matter.
If you don't Mind, it doesn't Matter...
This email has been displayed using 100% recycled electrons and 100% pure
virgin photons.
--- On Mon, 2/14/11, Chris Anderson (cmanderson) <cmander...@micron.com> wrote:
From: Chris Anderson (cmanderson) <cmander...@micron.com>
Subject: RE: Considering a consultant to help with semi-anechoic
chamber relocation and performance improvements
To: jim.eich...@schneider-electric.com, emc-p...@ieee.org
Date: Monday, February 14, 2011, 6:13 PM
Good luck Jim… We moved one two years ago and that pain is still fresh
in my mind. The only advice I can offer on that is to label everything and
take plenty of notes/pictures.
While I won’t be moving a chamber anytime soon, we are trying to get
approval to replace the same, aging 856x stack. If anyone cares to comment on
that online, I would be interested in any thoughts or recommendations as well.
We’re also in the same situation of needing to go beyond 1GHz RE measurements
(also in a 3m SAC), so any comments on that topic would be appreciated as well.
Thanks,
Chris
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of
jim.eich...@schneider-electric.com
Sent: Monday, February 14, 2011 3:15 PM
To: emc-p...@ieee.org
Subject: Considering a consultant to help with semi-anechoic chamber
relocation and performance improvements
Hi everyone: We are about to move (groan) and while this generally is
a pain, it provides the opportunity to fix a few problems along the way. Our
3m SAC is usable, and indeed gets fairly heavy use, but is not as good as I
think it could be, in a few ways:
- Our emissions measurement correlation to "real" labs is OK but
could be better, particularly on conducted emissions
- Our aging HP rack (the classic 856x series) is getting old and
is starting to be costly to maintain - time to switch?
- We have always just had a manual turntable and would like to
see what's involved in going with a motorized turntable and controller
- We have aging cones, many with broken tips - maybe not an
issue, but maybe it is?
- We haven't researched what it would take to go past 1GHz with
our RE measurements, but we need to
- Etc.
I think it would be worthwhile to have someone who is an expert in
design and troubleshooting of SAC's and EMC instrumentation come here, give us
a once-over, make recommendations for improvements that we could implement as
part of the move, and perhaps participate in the teardown and relocation of the
chamber (not as simple as it sounds) or recommend someone who could.
If you are interested and qualified, or know someone who is, please
reply to me off-line at jim.eich...@ca.schneider-electric.com. I would prefer
somebody at least somewhat local - we are in the Vancouver BC area.
Thanks,
Jim
_____________________________________________________________________________________
Jim Eichner | Schneider Electric | Renewable Energies Business |
CANADA | Compliance Engineering Manager
Site: www.schneider-electric.com/renewable-energies
<http://www.schneider-electric.com/renewable-energies> | Address: 8999
Nelson Way, Burnaby, BC, V5A 4B5
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