I support John's comments. I would also add that because the standards do not
guarantee error-free or flawless performance, and that immunity is largely a
performance issue, a manufacturer with concerns about the immunity performance
of his product relative to input voltage may, and should, evaluate that product
at various voltage levels to assure the quality of the product. That is the
manufacturer's job, not the regulation's.
John P. Wagner
Regulatory Compliance Mandatory Standards
AVAYA Strategic Standards.
1300 W. 120th Ave, Room B3-D16
Westminster, CO 80234-2726
Phone/Fax: (303) 538-4241
johnwag...@avaya.com
--
From: John Woodgate[SMTP:j...@jmwa.demon.co.uk]
Reply To: John Woodgate
Sent: Thursday, April 18, 2002 2:55 PM
To: emc-p...@majordomo.ieee.org
Subject: Re: Input voltage range - EN61000-4, 5 and 6
I read in !emc-pstc that brent.dew...@us.datex-ohmeda.com wrote (in
ofcf872f20.b441e386-on87256b9f.006aa...@us.datex-ohmeda.com) about
'Input voltage range - EN61000-4, 5 and 6', on Thu, 18 Apr 2002:
In the very specific case of Medical devices, the newest edition of IEC
60601-1-2 specifies -5 testing at the extreme ends the range of
continuously adaptive supply and in each range of a switched range supply.
That should be reserved for safety testing, for which it is justified. I
think it's gilding the lily for EMC. We are measuring with great
precision, using exhaustive (and exhausting!) test protocols, quantities
that bear only a very approximate relation to the actual EMC performance
in any given real-life condition. Thus, these costly measurements have
to be accompanied by a disclaimer that they do not guarantee freedom
from unacceptable interference and further measures may be required in
some cases.
AFAIK, apart from the 60601 case, for EMC testing the rated supply
voltage (or one of them) is applied.
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested in professional sound reinforcement and distribution? Then go to
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---
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