> Now I'm leaning towards testing being a requirement.
CE marking is required only in the European Economic Area (EU + EFTA), so
if you decide to test (not a requirement) the DIMM, use EN55022 and EN55024
(immunity).
John Radomski
Schneider Electric
[email protected]
Sent by: To:
<[email protected]>, <[email protected]>
owner-emc-pstc@majordo cc:
<[email protected]>
mo.ieee.org Subject: RE: opinions,
please
11/11/2003 05:33 PM
Please respond to
drcuthbert
I do have a custom shielded test fixture that will allow the DIMM to be
tested alone. Any desired READ or WRITE pattern can be used. The stimulus
equipment resides in a shielded rack directly beneath the DIMM. The DIMM is
mounted vertically and is free to radiate into the hemisphere above the
rack. Now, what level do I test for? CISPR 22 ? I was told that a mother
board can be CE Marked if it is <6dB over the limit. The theory being that
the enclosure will (might?) provide >6dB of attenuation. If this is so then
do I test the DIMM this way?
The reason I asked about DIMMs is because after reading the appropriate
documents I was convinced that it had to be tested and later changed my
mind. Now I'm leaning towards testing being a requirement.
Dave Cuthbert
Micron Technology
From: [email protected]
[mailto:[email protected]]On Behalf Of POWELL, DOUG
Sent: Tuesday, November 11, 2003 2:49 PM
To: '[email protected]'
Cc: [email protected]
Subject: RE: opinions, please
Derek,
Do you have a suggestion as to how the test should be performed?
-doug
Douglas E. Powell
Corporate Compliance Dept.
Advanced Energy Industries, Inc.
Fort Collins, CO 80525 USA
From: [email protected] [mailto:[email protected]]
Sent: Tuesday, November 11, 2003 8:56 AM
To: [email protected]; [email protected]
Cc: [email protected]
Subject: Re: opinions, please
In a message dated 11/11/2003 9:36:21 AM Central Standard Time,
[email protected] writes:
The EMC guidelines read: "... If the component is intended to be placed
on
the market as a single commercial unit for distribution and/or final use
this function has to be available WITHOUT further adjustment or
connections
other than SIMPLE ones which can be performed by any person not fully
aware
of the EMC implications..."
After seeing all the other list positings and thinking some more, I'm going
to change my opinion on what this should be marked as. Originally, I said
component. But...
This is a module that when added to a PC brings new capibility. But, it
also adds a path for noise to exit a system that the manufacturer may have
tested ( if they even did ) differently.
So I guess, I would say now that the module should be CE marked, and at a
minimum, the contribution it makes to radiated emissions determined.
I guess my second 2 cents worth....
Derek N. Walton
Owner, L F Research EMI Design and Test Facility
Poplar Grove,
IL 61065
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