Mr. Richmond makes an excellent point. A well-designed EMI control process
would levy some kind of derivative CE limit on the peripheral device that
operates off a PC's secondary supplies, and it would levy some kind of
secondary-to-primary isolation requirement on any FCC/CE stamped power
supply,
Neil Barker posted:
>> You need to select your host PC very carefully to ensure that it is
compliant, and that it is quiet enough for you to be able to tell whether
or
not your device is contributing to the emissions. <<
One also needs to take care the host selected doesn't suppress an emission
Ken Javor wrote
>> Between several hundred microfarads of storage capacity and the EMI
filter,
that doesn't seem terribly likely but it can't be completely discounted so
it makes sense as a rationale. <<
I'm thinking a USB device is not likely to generate signals a LISN would
see. On top of that
Different Elgar. ;-) And I enjoy his compositions, too.
Ghery Pettit
Intel Corporation
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of John
Woodgate
Sent: Friday, October 07, 2005 9:44 AM
To: emc-p...@ieee.org
Subject: Re: harmonic distortion testing
Brian O'Connell wrote (i
shbe...@rockwellcollins.com wrote (in
) about 'harmonic distortion testing', on Fri, 7 Oct 2005:
>Please forgive my ignorance of international, commercial regulatory
>standards, but I have questions on harmonic distortion testing (power
>feeds). Could someone point me to test equipment that per
I know this has been addressed before, but I am requesting a sanity check. As
of 1 August of this year, is it "wrong" to apply the 1998 version of EN 55022
under the EU's EMC Directive without also applying its Amendment 1:2000?
According to the dates published in the OJ, that seems to be the case.
Brian O'Connell wrote (in
) about
'harmonic distortion testing', on Fri, 7 Oct 2005:
>I have used and enjoyed instruments from Elgar for this purpose (but
>not an inexpensive solution).
I wouldn't associate Elgar with distortion. Harmony, yes. (;-)
--
Regards, John Woodgate, OOO - Own Opinio
I have used and enjoyed instruments from Elgar for this purpose (but not an
inexpensive solution).
luck,
Brian
> -Original Message-
> From: emc-pstc@LISTSERV.IEEE.ORG
> [mailto:emc-pstc@LISTSERV.IEEE.ORG]On
> Behalf Of John Woodgate
> Sent: Friday, October 07, 2005 9:02 AM
> To: e
jim.hulb...@pb.com wrote (in
)
about 'EN 55022 confusion', on Fri, 7 Oct 2005:
>I would appreciate once more a clarification and, if possible, a
>rationale for this situation.
Look back in the list's archives for recent articles by Brian Jones. He
is in by far the best position to explain thi
Please forgive my ignorance of international, commercial regulatory standards,
but I have questions on harmonic distortion testing (power feeds). Could
someone point me to test equipment that performs these tests?
Susan Beard -
Kim,
I would guess that your 385 Vdc is the output of a power factor correction
module. These do not usually provide any galvanic isolation (as you state),
so the 385 V is with respect to the mains input. We generally consider this
part of a circuit to be a "primary circuit" or "circuit derived fr
Helge Knudsen wrote (in
) about 'SV:
New EMC and R&TTE Lists in OJ', on Fri, 7 Oct 2005:
>If you click on the link I send you will get the front page of C 246 on
>the screen. Then you must click on the page number at the right and the
>PDF dokument appears if you have Adobe reader on your PC.
Hi John,
If you click on the link I send you will get the front page of C 246 on the
screen.
Then you must click on the page number at the right and the PDF dokument
appears if you have Adobe reader on your PC.
Best regards
Helge Knudsen
Test & Approval
Niros Communications A/S
Hirsemarken 5
DK-
Hi all
In EN 61010-1 the creepage and clearance in table 4 is based on a "Voltage
line to neutral". Is this a working voltage or is it just the mains supply ?
The reason I ask is that I'm involved in a switch mode PSU which have a 385
Vdc at the primary of the switch transformer. The 385 Vdc is g
Helge Knudsen wrote (in
) about 'New
EMC and R&TTE Lists in OJ', on Fri, 7 Oct 2005:
>On 5. October new lists on harmonized standards were published in OJ
>C246, see:
>
>http://europa.eu.int/eur-lex/lex/JOHtml.do?uri=OJ:C:2005:246:SOM:EN:HTML
>
They aren't shown on the page where you can downl
On 5. October new lists on harmonized standards were published in OJ C246,
see:
http://europa.eu.int/eur-lex/lex/JOHtml.do?uri=OJ:C:2005:246:SOM:EN:HTML
Best regards
Helge Knudsen
Test & Approval
Niros Communications A/S
Hirsemarken 5
DK-3520 Farum
Tel +45 44 34 22 51
Fax +45 44 99 28 08
email h
Between several hundred microfarads of storage capacity and the EMI filter,
that doesn't seem terribly likely but it can't be completely discounted so
it makes sense as a rationale.
> From: "Eric Petitpierre"
> Reply-To:
> Date: Thu, 6 Oct 2005 12:06:40 -0400
> To: "'Ken Javor'" ,
>
> Cc:
> Su
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