I read in !emc-pstc that Coleman, David
wrote (in <7103C9D213EBD111971400104B4968149EC0CD@ntexch-
f.racalinst.co.uk>) about 'Q. on Res Bandwith performace traceabiity' on
Wed, 3 Sep 2003:
>Why would the IEC standard for miniature fuses detail these
>abbreviations??? I think you have the wrong st
John,
Why would the IEC standard for miniature fuses detail these abbreviations???
I think you have the wrong standard!
Dave C.
From: John Woodgate [mailto:j...@jmwa.demon.co.uk]
Sent: Wednesday, September 03, 2003 7:42 AM
To: emc-p...@majordomo.ieee.org
Subject: Re: Q. on Res Bandwith
I read in !emc-pstc that Brent DeWitt wrote (in
) about 'Q. on Res
Bandwith performace traceabiity' on Tue, 2 Sep 2003:
>Are we done now?
No. All you guys are using non-standard abbreviations. Go read IEC
60127-3. (;-)
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co
I read in !emc-pstc that f...@dctolight.net wrote (in <41196.198.246.16.
251.1062534076.squir...@webmail.dctolight.net>) about 'Q. on Res
Bandwith performace traceabiity' on Tue, 2 Sep 2003:
>Since not everyone
>measures power we also define 0dbv = 1 mvolt into 600 ohms.
Well, you might define
emc-p...@majordomo.ieee.org]On Behalf Of
f...@dctolight.net
Sent: Tuesday, September 02, 2003 2:21 PM
To: ken.ja...@emccompliance.com
Cc: f...@dctolight.net; cgrassospri...@earthlink.net; emc-p...@ieee.org
Subject: Re: Q. on Res Bandwith performace traceabiity
>
> Incorrect. A dB is a dB.
Correct!
, September 02, 2003 1:21 PM
To: ken.ja...@emccompliance.com
Cc: f...@dctolight.net; cgrassospri...@earthlink.net; emc-p...@ieee.org
Subject: Re: Q. on Res Bandwith performace traceabiity
>
> Incorrect. A dB is a dB.
Correct! But who is talking about db? I'm sure you know t
eply-To:
> Date: Tue, 2 Sep 2003 15:08:57 -0700
> To: ,
> Cc: ,
> Subject: RE: Q. on Res Bandwith performace traceabiity
>
> Fred:
> Correction - a dBV is referenced to 1 Volt. R or Z has nothing to do with
> it.
> A dBmv is referenced to one millivolt. R or Z has
, 2 Sep 2003 13:21:16 -0700 (PDT)
> To:
> Cc: , ,
> Subject: Re: Q. on Res Bandwith performace traceabiity
>
>>
>> Incorrect. A dB is a dB.
>
> Correct! But who is talking about db? I'm sure you know that db is a
> dimensionless ratio. I believe we were dis
>
> Incorrect. A dB is a dB.
Correct! But who is talking about db? I'm sure you know that db is a
dimensionless ratio. I believe we were discussing power.
Let’s make sure we all have the formula:
db = 10 log (P1/P2) or
= 20 log (V1/V2) + 10 log (Z2/Z1)
A quick scan of the formula will
CISPR 16-1 and C63.2. I seem to recall seeing a bandwidth mask in CISPR 16
which specified both width and slope of the filter attenuation in three
ranges, from 0 to 3 dB down, 3 to 6 dB down and 6 db to (I think) 40 or 50
dB down.
Cortland
This message is from the IEEE EMC Society Product S
Incorrect. A dB is a dB. 3 dB down is half power but 70.7% voltage. 6 dB
down is 1/4 power, or one half voltage or current.
on 8/31/03 10:42 AM, f...@dctolight.net at f...@dctolight.net wrote:
>>
> A few basics: If we are talking about power points (no software puns
> intended) then it is t
I read in !emc-pstc that f...@dctolight.net wrote (in <39029.198.246.16.
251.1062344564.squir...@webmail.dctolight.net>) about 'Q. on Res
Bandwith performace traceabiity' on Sun, 31 Aug 2003:
>As the professors would
>say, it is left to the student to prove that 3 dbm = 6 dbv through the
>formu
>
A few basics: If we are talking about power points (no software puns
intended) then it is the 3 db points. If we are taking about voltage (or
current) points then it is the 6 db points. As the professors would say,
it is left to the student to prove that 3 dbm = 6 dbv through the formula
P = E
I believe Mr. Cuthbert is correct, but that doesn't change the fact that
CISPR 16 specifies 6 dB bandwidths.
> From: drcuthb...@micron.com
> Date: Thu, 28 Aug 2003 15:47:55 -0600
> To: , ,
>
> Subject: RE: Q. on Res Bandwith performace traceabiity
>
> I think that Sp
rasso; Emc-Pstc
Subject: Re: Q. on Res Bandwith performace traceabiity
My understanding is that it is the 6 dB points which are cited as the
bandwidth. I'm not up on CISPR 16 but to entirely specify the bandwidth the
60 dB down points are also specified. The slope you get from the 6 dB to
My understanding is that it is the 6 dB points which are cited as the
bandwidth. I'm not up on CISPR 16 but to entirely specify the bandwidth the
60 dB down points are also specified. The slope you get from the 6 dB to
the 60 dB points is called the shape factor.
> From: "Charles Grasso"
> Repl
16 matches
Mail list logo
