Date: Mon, 10 Oct 2005 14:46:35 -0400
> To: ieee pstc list
> Subject: Re: Conducted emission testing for FCC & CE.
>
> That is how we might deal with "CE+CE isn't CE." However, any derivative
> standard we may produce is
> 1) peculiar to own firm(s) and
> 2)
That is how we might deal with "CE+CE isn't CE." However, any derivative
standard we may produce is
1) peculiar to own firm(s) and
2) lacks the force of law.
If your firm is called, say, "Verizon" -- grin! -- you can impose standards
on an entire industry, but "Widget Works Work Rule 1(b)EMC" cut
id [S&FS]"
> Date: Mon, 10 Oct 2005 08:06:02 -0400
> To: "Ken Javor" , "ieee pstc list"
>
> Subject: RE: Conducted emission testing for FCC & CE.
>
> Why not test with the USB device connected to a USB hub and regard the
> PC as AUX EQUIPMENT.
>
to operate off a
clean source of dc power, eliminating the need to hunt for peripheral noise
sources amongst the PC's emanations.
> From: Cortland Richmond <72146@compuserve.com>
> Date: Fri, 7 Oct 2005 19:54:34 -0400
> To: ieee pstc list
> Subject: RE: Conducted emissio
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
> To: "'Ken Javor'" ,
>
> Cc:
> Subject: RE: Conducted emission testing for FCC & CE.
>
> Ken,
>
> Your logic would hold if all of the USB device energy was broadband at the
> same level.
> Since power supplies typically do not have a flat tra
,
Eric Petitpierre
Cornet Technology
Springfield, VA
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Ken Javor
Sent: Thursday, October 06, 2005 10:35 AM
To: owner-emc-p...@listserv.ieee.org
Cc: emc-p...@ieee.org
Subject: Re: Conducted emission testing for FCC & CE.
No answer
I would suggest that you do need to test at both supply voltages; but more
significantly, your greatest problem is unlikely to be your product but the
host PC. 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 wheth
clamp.
It is not at all obvious to me how the addition of the USB interface
necessitates a mains conducted emission test.
> From: "Robert A. Macy"
> Date: Thu, 06 Oct 2005 07:52:47 -0700
> To: kbalasubraman...@scmmicro.co.in
> Cc: emc-p...@ieee.org
> Subject: Re: Conducted
It is my opinion that you must test conducted emissions at
both AC input conditions, and archive those test results.
The mechanisms for conducted emissions can vary greatly
whether you're at 110/60 or 230/50. Better test. A good
Power Supply will minimally exhibit that effect, but who
knows i
For the FCC, conducted and radiated emissions have to be performed at 110 V.
EN55022 does not require any particular voltage.
My suggestion would be check do the conducted emissions at 110V, check
them at 230V, but do the radiated at 110V only.
regards
Charlie
> Dear Experts,
> Our prod
Dear All,
I am not an emc expert but can definitely say that such multiple testing is a
barrier to trade and will open a can of worms in other countries; imagine
Japan requiring test at 100 Vac 50 and 60 Hz, Taiwan requiring tetsing at 220
V, 60 Hz, Malaysia requiring test at 240 V, 50 Hz and so
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