Brian
I used to work at the TUVPS facility you mentioned and I belive they
stilll have that reflector although they stopped using it a couple of
years ago. Basically it was constructed from a single sheet of the
alluminum foil coated sheathing material popular in home
construction today.
Hello,
Has anyone heard of EPS (polystyrene?) packaging material soon to be not
accepted in the European Community because it is a Non-recycling material?
Best Regards,
Rick Loiselle
Boston Acoustics
Compliance Engineer
Peabody, MA (USA)
I found my copy of the original referenced article. One place it showed up
was EMC Test and Design, Feb/March, 1995. The article was titled IEC
1000-4-3: The New Radiated Immunity Test by Darren McCarthy of the HP
Company. On page 31 the dimensions of the wedge and construction techniques
are
I'm sorry to plague the list with such a mundane query, but I am forced to
perform the UL1950 '1.7.15 Permanence of Marking' test using HEXANE as the
test solvent. I cannot find a local source willing to sell less than
55Gal
0.5L would probably last me ten years.
Anybody know of a source?
I believe that there is an EIA standard for these dimensions.
--
From: Schanker, Jack [SMTP:jschan...@adaptivebroadband.com]
Sent: Wednesday, October 27, 1999 2:53 PM
To: emc-p...@ieee.org; Brian Harlowe
Subject: RE: Electronic unit panel sizes
Yes, I believe you've got it !
-Original Message-
From: Brian Harlowe [SMTP:bharl...@vgscientific.com]
Sent: Wednesday, October 27, 1999 12:30 PM
To: emc-p...@ieee.org
Subject: Electronic unit panel sizes
Excuse me from drifting away from the main topics of this forum.
Brian:
My understanding is that the U comes from rack Units, where the
incremental rack height is 1.75 inches and then continues in integer
multiples. So, 7.0 8.75 etc are all allowable rack panel heights, but 11.0
inches is not. It sounds to me like the American who chose 11 inches for a
Brian At Work wrote:
I am in search of information about a reflector (sometimes call a
Wedge) that is used in place of rf absorbing material between the
EUT and the antenna in the Radiated Immunity Testing (e.g.
EN61000-4-3). I have searched the PSTC database without luck. I was
told that
Brian,
Yes the U measurements are used in the United States. As you have found out
that does not mean that all units have a height that are in whole number
multiples of the U measurement. I don't believe that there is any
requirement that they be a whole number multiple of 1U, at least here in
Members,
I have heard some rumours that Spanish Maritime Authorities have not
enforced the LVD nor EMC directives so far (... for equipment not
covered by the marine directive...).
Can anybody confirm this ?
Best regards
Amund Westin
Det Norske Veritas
* amund.wes...@dnv.com
-
This
Brian
We manufacturer system where the components are routinely rack mounted. All
of our filler plates and assemblies as defined in Us, so yes it does (or
should) work here in the U.S.
Rick Busche
Evans Sutherland
rbus...@es.com
-Original Message-
From:
Brian and Mirko,
Thanks for your further explanations. Here is my understanding. Please review
and correct.
(1) A semi-anechoic chamber has five absorbing planes and one reflected plane
-- that is floor. There are two Electromagnetic waves from the antenna to the
EUT: Direct and Reflected
Have you verified that the noise is being _generated_ by the fan?
In some cases, I've found system wiring that was picking up noise from another
part of the system, and 'carrying' it to the AC inlet.
If this seems plausible in your case, try stalling the fan (momentarily!), or
replacing the fan
Hi Kevin:
Is IEC 536 the base document for the definition of SELV?
(where it says that SELV means Safety Extra-Low Voltage)?
Yes.
IEC 536, Definitions, Sub-clause 2.6:
Safety extra-low voltage (SELV)
HISTORY LESSON
==
Prior to IEC 536, I believe SELV was not
Dear Martin,
At the present time the ACA has not included any immunity requirements
under their EMC Framework, although new EMR (ElectroMagnetic Radiation)
requirements have been introduced since February these are not yet
applicable to ISM.
The following site has some further information
In order to provide acceptable field uniformity for immunity
testing to radiated field, you need to eliminate, attenuate
or control reflections/standing waves. Ferrite tiles only on
parts of the shielded room floor, walls and ceiling could do
it, the question is to identify minimum tiled
I believe Tania is correct for the following reasons.
If its says Listed and still has a manufacturers name or model number - fix
it in the report. Listed devices don't need that information in the report.
Only that it is Listed and the ratings. Listed products by their designation
are supposed
Brian,
The other, bit lesser corporate exercise program you could
consider would be to roll-over GND plane over ferrite tiled
floor. GND plane could be chicken mesh grounded at etches.
Did you measure NSA with floor tiles in place?
Mirko
-Original Message-
From: Brian At Work
More importantly, where is lunch served?
Scott
s_doug...@ecrm.com
ECRM Incorporated
Tewksbury, MA USA
-Original Message-
From: ghery.pet...@intel.com [mailto:ghery.pet...@intel.com]
Sent: Tuesday, October 26, 1999 7:03 PM
To: ken.ja...@emccompliance.com; nbels...@cisco.com;
Barry,
The reflector takes the place of the absorbing material that goes on the
floor between the EUT and the antenna. We have a 10 meter semi-anachoic
chamber in which we perform both emissions and immunity tests. To perform
the radiated immunity test we have to haul in 42 tile panels
Amund:
The best person to answer your question
is Mr. W.H.Chong (Director of IT Telecom Centre)
and Mrs.S.G.Chay (Director of E.E.Test Centre).
They are my ex-bosses a few years ago when I
was working with PSB.
Mr. Chong can be reached at (65)-7729721
email: cwh...@psb.gov.sg
Mrs.Chay can be
Hi Rich,
Thank you for devoting so much time to reply. This is just what I needed.
I am familiar with IEC 60950 and I wanted to be able to compare the
definitions. Thank you.
One other question to Rich or anyone else that can help.
Is IEC 536 the base document for the definition of SELV?
Hi Kevin:
Can anyone please provide the SELV definition from IEC 364?
I'm working from some old documents, but...
SELV is not expressly defined in IEC 364-4-41. Instead,
it specifies Protection by safety extra-low voltage.
It says:
Protection against electric shock in normal
Matejic and Brian,
Why not try ferrite tile paved on part of floor and wall in the Shielded Room
to absorb some reflected waves?
B Ma
-- Original Text --
From: Matejic, Mirko mmate...@foxboro.com, on 10/26/99 1:52 PM:
Brian,
Procedure was presented at IEEE EMC Symposium in
The question is - does he have full capability to do testing for the EMC
directive due to his location, or his equipment? Inquiring minds want to
know.
-Original Message-
From: Ken Javor [mailto:ken.ja...@emccompliance.com]
Sent: Tuesday, October 26, 1999 4:17 PM
To: Nathan Belsher;
In regards to comment 1. In a high frequency signalling environment, The
return current will flow on the nearest plane whether it is power or ground.
If you have two planes coupled closely togther you create a capacitor which
the high frequency return current uses to traverse the planes and takes
Now hold on - in your answer you indicated a high frequency
signalling environment.
Remember - capacitance( inductance) = delay = skew. Is this
what we are really looking for in a high frequency signalling
environment - Especially is skew is important?
OK if the timing diagram is NOT critical
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