What JaMi says about EMI testing has been my experience as well. The UL FCC
CSA VDE, etc, etc ..., agency typically has a disclaimer in their
documentation that indicates that the evaluation and licensing to use their
approval sticker/logo on your product is only for the product submitted to
be tested 'AS IS'. Any changes to the product, including changes to the
board layer stacking after approval, would have to go through the agency for
re-approval before making the change or shipping any product. Otherwise you
would have to remove their logo and not advertise, sell, or ship your
product with the label... that's where the legal stuff happens, they can
bring suit for unauthorized use of their logo on your product etc.. etc...
(Where's Judge Judy when you need her?)
At any rate, any of us that have gone through agency approval are familiar
with that requirement... and typically we get stopped at CCB for the changes
to get routed to the agency for review and testing if needed. Some changes
are not tested but approved on 'similar' design criteria, and that judgment
is made by the agency reviewer or inspector.
For some of you this is TMI - ( too much information ) but I'm sure it
applies in some designers cases.
(Is the Monday?)
:)
Bill Brooks
-----Original Message-----
From: JaMi Smith [mailto:[log in to unmask]]
Sent: Monday, June 09, 2003 2:11 PM
To: [log in to unmask]
Subject: Re: [DC] Core thickness/emissions
Alexis.
Please see below.
JaMi
> ----- Original Message -----
> From: "Alexis Meehan" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, June 09, 2003 1:14 PM
> Subject: Re: [DC] Core thickness/emissions
>
> . . . I have worked with many engineers who have
approved
> stackup changes such as this one. In those cases, the boards must have
passed
> EMI with a very wide margin so that a change in thickness would not affect
that
> particular test. Clearly, this is not the case with this particular board.
. . .
>
While I will preface my response by stating the fact that not all PC boards
require emissions testing, and that occasionally some companies and or
engineers will perform emissions testing on something that is not required
to have such testing performed, regulatorily speaking, that is the excepton
to the rule, and the exception to the following statement.
IT IS UNLAWFUL TO CHANGE THE STACKUP, OR ANYTHING ELSE ABOUT THE PC BOARD
ONCE THE EMISSIONS TESTING HAS BEEN COMPLETED, UNLESS YOU PERFORM NEW
EMISSIONS TESTING.
PERIOD ! ! !
NO EXCEPTIONS ! ! !
ALEXIS, YOU NEED TO KNOW THIS ! ! !
ALEXIS, YOU NEED TO UNDERSTAND THIS ! ! !
ALEXIS, YOU NEED TO TELL THIS TO ANYONE WHO WANTS TO SUGGEST TO YOU THAT YOU
MODIFY THE BOARD IN ANY MANNER WHATSOEVER, AFTER THEY HAVE GONE THRU
EMISSIONS TESTING, WHETHER IT IS YOUR BOSS, OR AN ENGINEER, OR A BOARD HOUSE
! ! !
ANY CHANGE TO THE PC BOARD INVALIDATES THE EMISSIONS TEST ! ! !
PERIOD ! ! !
I apologize if this is rude or if this is unprofessional, but you just don't
seem to get the point.
It is not just bad design practice, or bad engineering practice, it is
against the law.
JaMi
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