This little spreadsheet may of interest to one and all. It allows you to do the calc's if you don't have it already. Some of the middle columns aren't needed for the calculations but I like to see what's going on so I put them in. If its helpful send beer tokens this way - even if its not go ahead and send the tokens anyway. <<8080.xls>> Gary
-----Original Message-----
From: Price, Ed [SMTP:[email protected]]
Sent: Thursday, August 26, 1999 5:25 PM
To: '[email protected]'
Subject: FW: 80/80 calculation rules for CISPR22/EN55022
Posted for Dan Irish:
:-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-)
Ed Price
[email protected]
Electromagnetic Compatibility Lab
Cubic Defense Systems
San Diego, CA. USA
619-505-2780 (Voice)
619-505-1502 (Fax)
Military & Avionics EMC Services Is Our Specialty
Shake-Bake-Shock - Metrology - Reliability Analysis
:-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-)
> -----Original Message-----
> From: Dan Irish - Sun BOS Hardware [SMTP:[email protected]]
> Sent: Thursday, August 26, 1999 11:16 AM
> To: [email protected]; [email protected]
> Subject: Re: 80/80 calculation rules for CISPR22/EN55022
>
> Pierre,
>
> The standard form of the 80%/80% calculation is:
>
> mean + (k x Sn) <= L,
>
> It sounds like your customer is asking you to confirm:
>
> mean + (k x Sn) - L <= 0
>
> Simply subtract the limit L from your calculation at each
> frequency. Your results should be negative or 0 at
> all frequencies to pass.
>
> Regards,
> Dan
>
>
> > From: Pierre Selva <[email protected]>
> > To: "SAFETY-EMC (Adresse de messagerie)"
> <INTERNET:[email protected]>
> > Subject: 80/80 calculation rules for CISPR22/EN55022
> > Date: Thu, 26 Aug 1999 17:12:17 +0200
> > MIME-Version: 1.0
> > Content-Transfer-Encoding: 8bit
> > X-MIME-Autoconverted: from quoted-printable to 8bit by
ruebert.ieee.org
> id
> LAA14328
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> > X-Info: [Un]Subscribe requests to [email protected]
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> >
> >
> > Dear colleagues,
> >
> > My subject of interest is the statistical rule explain in
chapter 9.2 of
>
> EN55022 (also called the 80/80). Reading the standard, I don't
know on
> which
> value I have to apply the rule.
> > In fact, I usually apply the rule on each suspect frequency
(about 5 by
> product) and I compare the calculated LEVEL to the Limit, in dBµV.
> >
> > One of my customer is asking me to make this calculation on the
MARGIN.
> For
> each product, I have to take the worst margin, and I make the
calculation
> for
> the x products I have. The calcul gives a result which has to be
compare
> to 0
> (zero). The resulting margin has to be less than 0.
> >
> > How do you perform this calculation ?
> > On which value do you perform it (margin, level, azimuth, height
of
> antenna,
> ...) ?
> > What are your own experience with your products or your customer
?
> >
> > In advance, I thank you a lot for your answer, which, I'm sure,
will be
> of
> great value (80/80 calculation, of course !!)
> >
> > Best regards,
> > ================================================================
> > Pierre Selva
> > Laboratory responsible EMC and Safety
laboratory
> > SMEE Actions Mesures Ph : 33 4 76 65 76
50
> > ZI des Blanchisseries Fx : 33 4 76 66 18
30
> > 38500 VOIRON - France e-mail :
> [email protected]
> > ================================================================
> >
> >
> >
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8080.xls
Description: MS-Excel spreadsheet
