I usually have a problem with these equations. They give no reference to the
angle
at which the wave is impinging upon the sheet.
The way slots work is to put amaximum differential between the longest
sides.
If the impinging wave puts a circulating current laterally across the slot,
the slot
The last time I went to one of these and was found in a cheap motel it cost me
my house and half of everything I owned :)
So I'm betting you'll want to get someone else to give you a
recommendation.
Gary
Hi,
Another way of thinking about this is to consider the effective aperture of
the slot antenna on the source side of the shield this will more easily give
the amount of energy coupled into the antenna. However, remember that the
shielding effectiveness equation is specific to planes wave
Ed,
thanks you did give me the answer I was looking for. I think you are right on
the radiation from the aperture. It should have a dipole pattern and
illuminate only half the hemisphere. I did not include this in the
calculations and will add the extra 3 dB. I am investigating this because I
any one have recommendations??
Best Regards
Charles Grasso
Senior Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Email: charles.gra...@echostar.com; mailto:charles.gra...@echostar.com;
Email Alternate: chasgra...@ieee.org
-Original Message-
From: drcuthb...@micron.com [ mailto:drcuthb...@micron.com]
Sent: Thursday, July 10, 2003 11:59 AM
To: emc-p...@majordomo.ieee.org
Subject: apertures
I have a question on apertures. You may recall the formula
that is frequently given for signal attenuation
This is flammable atmospheres related.
A Zone 2 is an area where a hazardous atmosphere occurs only rarely,
or only under fault conditions. As a rule of thumb, this means less
than 10 hours per year.
The standard you need to refer to for a definition of how to
determine the extent of a
Chris:
You are dealing with hazardous area designations. I've dealt with these on
past products, and here is my best recollection:
Zone 2 probably refers to an area classification where flammable material
may be present abnormally (i.e., not normally present).
Class I, Div 2 refers to an
The recruiter listed below gave me the following contract opening. I am not
able to commit to a 9-month assignment right now. If anyone is interested, you
can contact him directly.
Good luck.
Need an EMI / EMC design and analysis guy. They are making a black box and
need a guy to come in
Here is another way to view an aperture, referenced to a resonant 1/2
wavelength dipole. On one side of a very small aperture, in a large conductive
sheet, there is a dipole. It is connected to an identical dipole on the other
side of the aperture. The energy intercepted by the first dipole is
Hi everyone,
I hope that all of you are having a fun and safe summer.
I know that this subject has been brought up before, but I can't find the
searchable archives. If someone has the url, could you please email it to me,
thanks.
Anyway, we've had a customer ask about Zone 2 hazard
I am looking for a back issue of the Journal of
Electrostatics: Volume 33, No. 1, 1994. Anyone mind
sharing?
Regards,
Peter L. Tarver, PE
Product Safety Manager
Sanmina-SCI Homologation Services
San Jose, CA
peter.tar...@sanmina-sci.com
This message is from the IEEE EMC Society Product
Dave,
Further to Alex's reply, you should decide for yourself what level of
documentation is required from the modem supplier (and the power supply
provider for that matter).
From what you say, you will be incorporating these sub-assemblies into a
product of your design. Presumably, that
Two other manufacturers of a loop sensor to this specification are
ETS-Lindgren (formerly EMCO), Model 7604, and Solar Electronics, Model
7334-1.
When I needed the same loop about a year ago, I was able to obtain one of
these ex-stock. Both are similarly priced.
I was also able to hire one from
Hi Dave,
For the EU there is no modem Standards requirement, although it is normal
for the analogue modem to be tested to TBR21 (CTR21) and some EU country
deviations. The CE mark will indicate compliance to EMC and Safety. You
should have the DoC to the RTTE from the maunufacturer, which
Hi Peter,
Really appreciate your reply.
Thank you for the advice re the UL web site however I am not sure that would
be the appropriate product category. When determining compliance
requirements for Australia and Europe it was felt the Australian and
European versions of IEC 60065 were more
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