Here are my thoughts on CB Certificates:
I have gotten CB Certificates with the complete test report accepted in
countries that were NOT members of the CB Scheme.
After they became readily available I have always requested a CB Certificate
and
complete test report before I approved the use of an alternate power supply or
CD ROM drive.
If a lab does a decent job of testing the power supply or the CD ROM drive they
will have produced a test report anyway. So the addition of the certificate is
not a big hit.
I review the test report and ask that any omissions or mistakes are corrected,
before I send it anywhere else. Usually there are some minor problems even
from
the very best labs.
Consequently, the alternate power supplies or CD ROM drives are approved for
use
in a certified product with very little cost and effort - just send them the
certificare, the test report and a sample.
If you request the lab to test the laser output of the CD ROM drive during
fault
conditions. and find it can't exceed class I limits (per 825) and state that in
the test report, it will cost very little extra and save the cost of
translating
all of the required laser safety messages.
Regards, Lou Aiken
Begin Forwarded Message
Return-Path: owner-emc-p...@majordomo.ieee.org
From: pe...@itl.co.il (Peter Merguerian)
To: ri...@sdd.hp.com, ron_pick...@hypercom.com
List-Post: emc-pstc@listserv.ieee.org
Date: Sat, 21 Nov 1998 18:11:15 +0200
Subject: Re: Why are CB reports truly useful?
CC: emc-p...@majordomo.ieee.org
Reply-To: pe...@itl.co.il (Peter Merguerian)
Ron Hi!
In short, the new CB full Certification Scheme will allow acceptance
by another CB member of BOTH the test results and construction.
Under the present scheme, another CB member should accept test
results but has the right to ask for sample(s) and other pertinent
information for a construction evaluation.
Based on my experience, CB could be a pain in the neck. Here
is one example:
Consider a product with an Approved Switching Power Supply.
Unless the power supply has a CB Test Report of its own (and
most do not!) the certification agency must include an evaluation of
the power supply. This means you have to contact the power
supply manufacturer and ask him to provide all the necessary
information and/or samples needed by the certification agency in
order to issue the CB Certificate. Now imagine a manufacturer had
more than one or altenate power supplies in his product.
As we all know, most power supplies in the market today are UL
Recognized and/or CSA Certified and TUV/VDE Approved.
Therefore, it seems that the best approach to get a CB for a
product with switching power supply(ies) is to go to UL/CSA/TUV
or VDE, all who have a record of the power supply safety evaluation
(including schematics, parts list, etc.). This really is not fair to the
other CB certifiers who have paid lots of money to get their labs
accredited under the CB program.
Regards
PETER MERGUERIAN
End Forwarded Message
Best Regards, Lou Aiken
27106 Palmetto Drive
Orange Beach, AL
36561 USA
tel 1 334 981 6786 fax 1 334 981 3054
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