TEM cells large enough for a very small computer are, I believe, available.
I don't have the sales literature in front of me and I haven't seen it for
awhile, but in my opinion you would be better served if you invest in
pre-compliance equipment, a small ground screen etc, even with a less than
ideal site.
Both units will take time for you to learn how to interpret the data and how
it compares with the OATS you'll eventually have to us. The TEM cell will
required constant manipulation of the unit to expose the various fronts to
the "antenna".
The pre-compliance equipment is going to have some problems because of
ambient noises and lack of a proper environment, ground screen, full antenna
mast height, etc. But I think you can get closer to the OATS with this
equipment if you can control the electrical ambient at all, and you have
considerably more flexibility at working on the EUT etc during this phase of
testing.
Either of these methods are only going to give you an A/B type test with
just enough information to make a good educated guess as to when you are
ready to go for a formal test, but having used both methods - the TEM cell
much less - I'd much prefer the small parking lot type of pre-compliance
system.
That obviously is a personal opinion. Neither my wife or children listen to
it so maybe you shouldn't either.
Thanks
Gary
-----Original Message-----
From: Green, Henry [SMTP:[email protected]]
Sent: Friday, July 30, 1999 6:08 AM
To: 'Qu Pingyu'; 'emc'
Subject: RE: cost effective EMC facility
I do not believe that the GTEM is a suitable option for testing a PC
due to
the size limitations of the GTEM. The GTEM has, for lack of a better
term, a
"sweet spot" that the EUT has to occupy for optimum results.
Although you
might be able to place your EUT in the GTEM, it would not
necessarily be
confined to this "sweet spot." This being the case, the
repeatability, and
accuracy of your measurements would be questionable. Another
consideration
is the requirement that you have correlation to an OATS. Just my
2-cents
worth.
Henry E. Green
Gateway Regulatory Compliance
-----Original Message-----
From: Qu Pingyu [mailto:[email protected]]
Sent: Friday, July 30, 1999 3:38 AM
To: 'emc'
Subject: cost effective EMC facility
Hello, everyone:
I posted an question several weeks ago asking about
GTEM.
Thanks those who
share with me your experience. I may not address my
problem
very clearly
thus I would like to come back to you one more time.
We are a R & D orgnization in Singapore mainly
dealing with
semiconductor
industry. Since there are some requirements from our
industry partners in
the area of EMC design, we are considering setting
up some
EMC measurement
capabilities. At the intial stage, we will only
consider
equipment for
radiated emission/susceptibility testing. Our
objective is
to evaluate the
EMC performance of the product from our customers,
being of
PCB level or
system level. Based on those results, we can help
our
customers to improve
their product EMC design so that their product can
pass the
final compliance
testing. The EUT could be small, such as integrated
circuits
on PCB, but it
can also be large such as a PC. Due to our budget
constraint, I think GTEM
maybe a good choice. Do you guys agree ? If not, any
other
suggestions ?
Thanks in advance.
Best Regards
Qu Pingyu
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