Do not disagree with this point, and the Klingon High Command has forbidden
disagreement with Mr. Woodgate, for many a good reason of canon, there is this:
"This generic EMC immunity standard is applicable if no relevant dedicated
product or
product-family EMC immunity standard exists."
It
I agree with the other responses that it is unusual for Ethernet to fail CM
susceptibility at such low frequencies. There is likely something wrong with
either the test fixture or the design of the Ethernet interface circuit.
At one time it was allowable to use either a direct-injection CDN
Wow, funny how easy it is to forget what the discussion is about.. Ghery I
agree with you. Complying to a standard means just that. Meeting the
requirements of the standard which defines the criteria. Referring to normative
and informative references does not change the scope or definition
Marina -
A new version of the standard is in process of being adopted, and this test
is one of the areas that is evolving.
Regarding power frequency magnetic fields:
1-The IEC 60601-1-2 {Edition 3} has no exceptions that I can find.
2-However, IEC 60601-1-2 {Edition 4} includes a note
I caution you about using beads or chokes on Ethernet. Great risk of killing
the eye at 100m thereby reducing the distance significantly. You may want to
complete some functional tests before wasting your time at an EMI lab.
Rodney Davis
From: Douglas Smith
Some additional details are required to provide possibilities.
* is this gbit Ethernet or less?
* does this interface provide or accept 802.3 af/at power?
* is the product housed in a metal enclosure or plastic?
* are CM caps installed at the center taps and where are they
I'll only add that the descriptions and examples in the 61000 generics are
pretty clear. Like everything else with EMC, there are shades of grey.
___
Ralph McDiarmid | Schneider Electric | Solar Business |
Dear colleagues.
Many thanks for your responses, they have all made interesting reading.
However; I am no wiser regarding whether sports stadia or theatres would be
considered Class A or Class B environments. As a manufacturer of a range of
products that can be used in bedrooms through to
I have a failure when testing Conducted RF injected (IEC/EN61000-4-6) on
Ethernet cable. Lose communication in the test range 20-80MHz (10Vrms 80% AM).
Possible actions:
1. Snap on ferrite inside the EUT (do not want this action)
2. The RJ45 connector on the EUT has a little PCB and
Immunity problems with Ethernet normally are a CM-to-DM conversion problem
caused by bad symmetry somewhere. (unless the interference takes place
elsewhere
ie before the Ethernet chips)
Don’t expect much of ferrite in the frequencies below 80 Mhz.
Conducted immunity is injected out of
Dan is correct, but first make sure the lab did the test correctly, most do not
in my experience leading to often a 6 dB over test. When I have pointed this out
to test labs during testing, they always correct their testing when shown the
paragraph about the current limit.
After the test is run
Ian,
I'm not a lawyer, nor do I play one on TV, but in my opinion (worth exactly
what you are paying for it) these would be examples of Class A environments.
They aren't domestic environments. Others may disagree, but that's how I
view it.
From: McBurney, Ian
Your option #2 may kill the Ethernet signal unless the beads are 4 or more
terminal common mode ones.
Doug Smith Sent from my iPhone IPhone: 408-858-4528 [tel:408-858-4528] Office:
702-570-6108 [tel:702-570-6108] Email: d...@dsmith.org Website:
http://dsmith.org
On Thu, Dec 10, 2015 at 01:26,
The question is about CISPR 32 (EN 55032), not the generic standards.
From: John Woodgate [mailto:jmw1...@btinternet.com]
Sent: Thursday, December 10, 2015 9:22 AM
To: 'Ghery S. Pettit'
Cc: emc-p...@ieee.org
Subject: RE: [PSES] EN55032 definition of residential environment
I regret that
I regret that the standards disagree with you. See the Scope clauses of
IEC/EN 61000-6-1 and -2.
With best wishes. OOO - Own Opinions Only
J M Woodgate and Associates Rayleigh, UK
www.jmwa.demon.co.uk
From: Ghery S. Pettit [mailto:n6...@comcast.net]
Sent: 10 December 2015 16:57
To:
Ian
You might want to look at definitions in CISPR 11 and cite those in your
application of other emissions standards under the EMC Directive.
class A equipment
equipment suitable for use in all establishments other than domestic and those
directly connected to a low voltage power supply
By the way I would assume both the Stadium and Theatre as Commercial
environments
From: Rodney Davis
Sent: Thursday, December 10, 2015 8:42 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Reply To: Rodney Davis
Subject: Re: [PSES] EN55032 definition of residential environment
Ian, pretty simple
Ian, pretty simple situation. Look at your product, if it can be sold for the
bedroom Class B, However if due to cost and size and the likelihood being
extremely low Class A.
A piece of commercial equipment notwithstanding home use will be Class B. So
the question you must ask your self is
How much did it fail by? You need to know this.
This test is often done in error by test labs resulting in a 6 dB over test.
Make sure they are applying the current limit loophole that is allowed for many
cases, often for Ethernet cables.
Be sure the failure is in your equipment not the aux
I think my posts about EMC environments are not being reflected. Has anyone
seen my quotes from the Scopes of 61000-6-1 and -2?
With best wishes. OOO - Own Opinions Only
J M Woodgate and Associates Rayleigh, UK
www.jmwa.demon.co.uk
-
Amund,You did not mention if it was 100Base-T or Gigabit but I have found both to be pretty robust in immunity testing. I would look first at what may be causing what you have to lose communication rather than try to filter out common mode currents. Because it is a differential interface a
Hello john;
I received your email today at 12:12 UK time.
Ian McBurney
Design & Compliance Engineer.
Allen & Heath Ltd.
Kernick Industrial Estate,
Penryn, Cornwall. TR10 9LU. UK
T: 01326 372070
E: ian.mcbur...@allen-heath.com
-Original Message-
From: John Woodgate
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