The title of ENV 50204 is: RADIATED ELECTROMAGNETIC FIELD FROM DIGITAL
RADIO TELEPHONES - IMMUNITY TEST
Cheers,
Jacob Z. Schanker, P.E.
Director of Agency Compliance
California Microwave
716 242 8454 (voice)
716 242 8427 (fax)
j.schan...@mdsroc.com
---
Friends:
Does this title make any sense? Or is it that I just don't see it?
Bogdan.
-Original Message-
From: Bailin Ma [SMTP:b...@namg.us.anritsu.com]
Sent: Tuesday, July 21, 1998 10:25 AM
To: emc-p...@ieee.org; miksher...@aol.com
Subject:
WOODS, RICHARD wrote:
I am about to give a short seminar to our Mechanical Engineers and
Designers
on enclosure design for EMC compliance. There is only one problem - I
have
no faith in the theory I have for the attenuation through openings.
The
following formula is from the EMC Handbook,
At recent symposium in Santa Clara, I talked to some length
with one of the speakers about round holes in shielding for
ventilation. For all the equations I've seen and tried to
verify, they really don't pose a problem with the work I've
done. But, that's strictly my experience and that in
Just appearing in the 20 July 1998 OJ, this appears to be a preliminary step to
publishing a new directive that regulates interesting stuff, quoting:
...on radio equipment and telecommunications terminal equipment and the mutual
recognition of their conformity
See it at
Derek, there is a big difference between military/Tempest equipment and
commercial equipment. I have used honeycombe filters in Tempest designs
because of the very low limits. But, In my 30 years of design experience of
point-of-sale equipment, mini-computers, PCs, and other types of business
Radiated Electromagnetic Field from Digital Radio Telephones - Immunity
Test
-
Original Text
From: miksher...@aol.com, on 7/21/98 7:11 AM:
Quick question: what's the title/subject matter of ENV 50204?
thanks!
Mike Sherman
FSI International
miksher...@aol.com
or
msher...@fsi-intl.com
Richard,
The caveat in Henry Ott's statement about 20 dB, are the words,
properly designed. For equipment that is not properly designed, 20
dB may be a little on the lean side. Boards that are not properly
designed are very common.
Since it is difficult to predict shielding performance (or
Greetigs,
Many of our group have indicated an interest in Accelerated Stress Testing.
The IEEE com. TC-7 is again giving the following Technical Meeting.
Hope to see you there.
Richard Haynes
-Original Message-
From: Mantz, Joe joe.ma...@attws.com
To:
Hello my esteemed colleagues:
Are there any isolation (HY-POT) requirements to isolate the user from the
cable plant? Maybe not as the cable plant is buried. Would it be SELV?
Should one anticipate power line induction issues?
I assume that IEC-950, UL 1950, etc. are the correct standards to
-
Original Text
From: Chase Wurz cw...@email.msn.com, on 7/21/98 8:46 AM:
To:
Cc:
Q: I have similar question. Those Accelerated Stress Tests (AST) are
significantly important for the satellite and space shuttle designers.
Are they of the same importance to those electronic systems
Jim,
you hit the nail on the head, even with extensive calculations, the error is
large. Seasoned EMC chaps tend to ask for thin-walled Honeycombe openings with
a depth at least 5 times the hole dia. If you can't live with a deep hole,
life gets hard
Derek Walton
Owner: L F Research EMC
Quick question: what's the title/subject matter of ENV 50204?
thanks!
Mike Sherman
FSI International
miksher...@aol.com
or
msher...@fsi-intl.com
Thanks to all of you who replied to my request. I received at least four
different formulas ranging from the very complex to the very simple. Some
equations were based upon the wave guide beyond cutoff principle, but some
people said that the wave guide formula does not apply to thin panels. Most
Don't forget that proper HALT testing is to test to failure, i.e., if the
product doesn't fail the HALT test was not performed properly. You do not
pass a HALT test. You learn from the failures.
Hans
Richard,
Even though you are a mechanical type, you have put your finger on a
week area in EMC design. The brutal truth is that there are no good
design rules for shielding. While this may be shocking, since it is far
from a new topic, it is due to the complexity of the problem. If you
look at
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