Tania and Amund,
IMHO, the margin of compliance should be at least equal to or greater than
the measurement uncertainty. Measurement uncertainty for radiated
emissions is generally in the range of 3 to 4 dB for most labs.
Jim Hulbert
Pitney Bowes
"Tania Grant"
<taniagr...@msn.com> To:
<am...@westin-emission.no>, <emc-p...@majordomo.ieee.org>
Sent by: cc:
owner-emc-pstc@majordom Subject: Re: EMI guard
bands
o.ieee.org
12/17/2001 01:38 PM
Please respond to
"Tania Grant"
Amund,
My minimum criteria and recommendation has always been at least 6dB.
However, how many engineering managers, upon finding a 1.5 dB margin in
their favor, rule "ship it"!
Education (repeated brainwashing of as many 'powerful company managers) has
been my response;-- but that often takes time.
In those cases, there is a written memoranda signed by me explaining why
that kind of approach is not correct.
taniagr...@msn.com
----- Original Message -----
From: <am...@westin-emission.no>
To: <emc-p...@majordomo.ieee.org>
Sent: Sunday, December 16, 2001 11:20 AM
Subject: SV: EMI guard bands
>
> Cecil,
>
> When thinking of EMI guard band (margins), I put the following into mind:
> 1. variation in production (a couple of dB)
> 2. uncertainly during measurements (5-6 dB at lower frequencies like
30MHz)
> 3. variation from labs to labs (I don't know ....4-6 dB ?? )
>
> I think 6-8dB should give you a good feeling.
>
> Amund
>
>
>
>
>
>
> -----Opprinnelig melding-----
> Fra: owner-emc-p...@majordomo.ieee.org
> [mailto:owner-emc-p...@majordomo.ieee.org]Pa vegne av
> cecil.gitt...@kodak.com
> Sendt: 10. desember 2001 13:46
> Til: emc-p...@majordomo.ieee.org
> Emne: EMI guard bands
>
>
>
> From: Cecil A. Gittens
>
> I am in the process of putting a document together for products that are
> tested for Radiated & Conducted Emissions
> that should have a Guard-band of 6 dB for FCC or CISPR22 class A or B.
> Does it depend if the product is class A or B?
> Does anyone have any pointers or suggestions?
>
> Thanks.
>
>
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