It was meant as a jest (see the smiley face). Besides I'm glad that you've
explained that the emissions stop at interfering with broadcast equipment
and don't affect medical equipment. I can go get that defibrillator now. :)
(see the smiley face again).
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
=========================
Ken Javor
<ken.javor@emccom
pliance.com> To
<[email protected]>
06/27/2007 11:40 <[email protected]>
AM cc
Subject
Re: Internal Margins for Emissions
Testing
That last comment is a non-sequitor - emissions limits have nothing to do
with medical procedures or safety. CISPR type emissions requirements do
one
thing, and one thing only. They protect customer reception of broadcast
radio wave reception.
> From: [email protected]
> Date: Wed, 27 Jun 2007 11:16:54 -0500
> To: [email protected]
> Subject: Fw: Internal Margins for Emissions Testing
>
> John, I agree...............but not if I'm laying on a table in an
> operating room : )
>
> Bob Heller
> 3M EMC Laboratory, 76-1-01
> St. Paul, MN 55107-1208
> Tel: 651- 778-6336
> Fax: 651-778-6252
>
============================================================================
>
>
>
> John Woodgate
> <[email protected]
> o.uk> To
> Sent by: [email protected]
> [email protected] cc
>
> Subject
> 06/27/2007 10:40 Re: Internal Margins for Emissions
> AM Testing
>
>
>
>
>
>
>
>
>
>
> In message
> <[email protected]>, dated
> Wed, 27 Jun 2007, "Kunde, Brian" <[email protected]> writes:
>
>> I wish the standard had the margin built in somehow, but that doesn't
>> seem practical for everyone.
>
> They do have margin built-in, but you won't get many to admit it,
> because it sounds bad, politically. Also, manufacturers can only take
> advantage of it if they can use the 80-80 rule (which allows a small
> percentage of non-compliant product to be shipped).
>
> Interference that matters results in complaints to authorities. If
> no-one complains, it can't matter, can it?
>
> So it makes economic and practical sense to set the limits so that there
> is a small but manageable level of complaint. Few will admit that this
> is what is done, but, whether intentional or not, it IS what happens in
> many cases. If there are never any complaints, the limit is set too low,
> maybe a lot too low, isn't it?
>
> So the 'margin' is between the actual limit (resulting in, say, 10
> complaints a year) and that higher limit (resulting in, say, 50
> complaints a year) that would cause the authorities to demand its
> reduction.
> --
> OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
> There are benefits from being irrational - just ask the square root of 2.
> John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
>
> -
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