Group
After reading Ray's reply, I realise I had written LISN instead
of CDN. Kindly replace LISN with CDN in my original posting.
Rgds
From: r...@rpgarner.freeserve.co.uk [SMTP:r...@rpgarner.freeserve.co.uk]
Sent: Wednesday, September 24, 2003 1:39 PM
To: Chris Chileshe; emc-p
this be the way to go?
Best regards
- Chris Chileshe
- Ultronics Ltd
- UK
(O.O.O.)
This e-mail has been scanned for all viruses by Star Internet. The
service is powered by MessageLabs. For more information on a proactive
/Standards THANKS
I read in !emc-pstc that Chris Chileshe chris.chile...@ultronics.com
wrote (in 01c35ce5.8dbac680.chris.chile...@ultronics.com) about
'Lightning Surge Characterization/Standards THANKS' on Thu, 7 Aug 2003:
Err.. should that read Ladies and Gentlemen?
There may well be some ladies
this.
In addition to including the additional tests, vehicle manufacturers
may also require higher stress levels for radiated immunity. 50V/m
and 100V/m are common examples, and the conducted immunity
spectrum often extends down from 30Mhz to audio frequencies.
Best regards
- Chris Chileshe
- Ultronics Ltd
.
To the best of my knowledge, the directive does not require
conducted emissions to be performed but some vehicle
manufacturers may insist on it as the directive appears to
have a number of shortcomings, which I am told are being
addressed.
Best regards
- Chris Chileshe
---
(Own Opinions Only
regards
- Chris Chileshe
- Ultronics Ltd
(Own views only etc etc)
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addressing testing of signal lines.
Regards
- Chris Chileshe
(own views etc etc)
From: drcuthbert [SMTP:drcuthb...@micron.com]
Sent: Thursday, March 20, 2003 5:15 PM
To: 'jrbar...@iglou.com'; drcuthbert; emc-p...@majordomo.ieee.org
Subject:RE: surge Z?
Thanks to everyone
invite you!
Good luck, and remember, it is a worthwhile undertaking!
Best regards
- Chris Chileshe
From: King, Richard [SMTP:richard.k...@uk.thalesgroup.com]
Sent: Monday, March 24, 2003 11:07 AM
To: 'emc-p...@majordomo.ieee.org'
Subject:Help wanted with succinct subject
Group,
Thank you everyone for your replies and pointers.
As usual, your advice has been well informed and most useful.
Best regards
- Chris
-Original Message-
From: Chris Chileshe [SMTP:chris.chile...@ultronics.com]
Sent: Thursday, November 14, 2002 1:00 PM
To: 'Emc-Pstc' (E
Ladies and Gents,
Kindly assign subject headers to your e-mails. It helps with mail sorting
(both manual and auto) and identification of viruses. Mail without a subject
header always looks very suspicious.
Best regards
- Chris
-Original Message-
From: Pettit, Ghery
The replies I got and some useful web sources ...
__
The Canadian Standards association published a book Hazardous Locations, A
guide for the design, construction and installation of Electrical Equipment.
It was written Pre-ATEX Directive, and I
Group,
The last response to recommended reading on basic EMC was very
good.
Are there some recommended texts on application of the intrinsic
safety standards, designing for I.S. and/or application of the
directive?
Any thoughts/pointers welcome
Best regards
- Chris Chileshe
- Ultronics
Could this be the Statutory Term of presumption of conformity of superseded
standard?
Of course I jest!
I tried to take the easy way out by splitting up the word and effectively
changing the short form to a phrase Doc of POCOSS but then realised
that was all wrong and intuitively means
Ted,
I have just been to the site and agree it is excellent. I cannot believe
the
many differences! It is almost a wonder we communicate at all!! Once or
twice I went That's why he didn't understand or So that's what she
meant.
Of course a lot of it can be deduced from context, but there are
this may not
be stated explicitly? Should I prolong the exposure of the varistor-free
circuit at
2kV to see if I am dealing with delayed failure potentially? I have been
setting
my burst duration to 1 minute.
Any pointers?
Regards
- Chris Chileshe
- Ultronics Ltd
of lubrication following hip
replacement. Testing inevitable.
Homeless context: - Welcome refuge on rainy nights.
Best regards
- Chris
-Original Message-
From: Scott Douglas [SMTP:dougl...@naradnetworks.com]
Sent: Friday, October 11, 2002 8:34 PM
To: Chris Chileshe; emc-p
- Chris Chileshe
- Ultronics Ltd
-Original Message-
From: George Stults [SMTP:george.stu...@watchguard.com]
Sent: Thursday, October 10, 2002 9:13 PM
To: 'emc-p...@ieee.org'
Subject:requirement for surge and EFT
Hello Group,
I am talking with an offshore manufacturer who
you JW) is quite relevant to a second product I
am working on.
What is clear is that it is best to sort out the process. Saves one a lot
of grief later on.
Your replies have provided the much needed leverage to get process
control to take responsibility.
Best regards
- Chris Chileshe
to a connector dry joint.
The connectors are rated for 6A DC continuous.
Any ideas how these can be picked up early or what measures you
have in production to eradicate these problems?
Regards
- Chris Chileshe
- Ultronics Ltd
Ian wrote ..
I believe the generic standard EN61000-6-2 refers to
testing using pulsed modulation at 900MHz only.
to which John replies ..
I can't find any mention of that in EN 61000-6-2.
Agreed. I test to EN 61000-6-2 and I have never come across this
requirement. I have just been
but again vehicle manufacturers might insist).
Add the test method and limits of the automotive directive 95/54/EC for
radiated emissions.
Safety is covered by the SAE standards.
Regards
- Chris Chileshe
- Ultronics Ltd
-Original Message-
From: robert.s...@flextronics.com
Jim,
Does equipment intended to be connected to the lighter have to conform
to the automotive transient immunity requirements (ISO 7637/ SAE J1113)
in its own right i.e. not assume the power to the lighter is a 'clean' supply?
Regards
- Chris
-Original Message-
From: Jim Eichner
Bill's AutoSignature reads ..
Friends are those people who know the words to the song in your heart and
sing them back to you when you have forgotten the words.
(unattributed)
*** Visit us at www.artesyn.com/cp
using larger
caps-to-case to maintain the impedance ratio).
Thank you again for the wonderful responses.
- Best regards
- Chris Chileshe
- Ultronics Ltd
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Chris Chileshe
Sent
Patrick writes ..
Fortunately for me this issue went away fast as
it came up and I was told I don't need to pursue
this any further for now.
I am afraid this realisation comes too late! The group has already
sent its responses. I don't see that you have much of a choice
now but to
of
EN 61000-6-2 ( 150kHz - 1Ghz) or is it generally accepted that even the
so called 'wideband' ferrites (SMT 0603/0805 max) are good down to
about 5MHz but no lower?
Any relevant comments welcome.
Best regards
- Chris Chileshe
- Ultronics Ltd
Oh I don't know. Maybe the ad. proceeded to read ...
Your job will entail constant telephoning of the above institutes and ordering
pizza, with extra mozzarella and pepperoni. You will be occasionally required
to issue bomb threats when any of the above organisations convenes for
meetings or
on the printed circuit boord finally making the
Faraday cage !!
Papers I have read on this showed an excellent reduction
in emissions (20dB) - neglecting the effects of the ICs
I know that AMP used to market this but it did not seem to
achieve markey acceptance.
Charles Grasso
From: Chris Chileshe
More info - very good info I think - at
http://www.rfi-wireless.com/pages/press/articles/ART014.htm
Regards
- Chris
-Original Message-
From: Fang Han [SMTP:f...@qualcomm.com]
Sent: Monday, June 24, 2002 6:45 PM
To: emc-p...@majordomo.ieee.org
Subject:ESAs
Spot on Tom!
I have always stuck with lower case k - even when entering values
in a database which is all in upper case! Of course, this scientific
correctness lasts only a few days before someone spots my wonderful
room temperature components, dips them in liquid nitrogen and the
next thing I
I have found the Pico data logger (with type K thermocouples) ideal for my
requirements. It connects between about 8 thermocouples ( I use type K)
and a PC ( RS232 ).
http://www.picotech.com/thermocouple.html
Regards
- Chris Chileshe
- Ultronics Ltd
-Original Message-
From: richwo
Bill,
Do we know which virus it was?
Regards
-Original Message-
From: Bill Ellingford [SMTP:bill.ellingf...@motion-media.com]
Sent: Wednesday, April 24, 2002 12:37 PM
To: 'jmw'; emc-p...@ieee.org
Subject:RE: A very nice game
Importance: High
URGENT
Please be
standard, safety or
otherwise that one can use as a guideline for test setups, parameters and
performance criteria?
Thanx in advance.
- Chris Chileshe
This e-mail has been scanned for all viruses by Star Internet
to refer to the SAE standards. I cannot say
for sure if
EN60950 is adequate.
http://www.sae.org/technicalcommittees/index.htm
Hope this helps
Regards
- Chris Chileshe
- Principal Electronics Design Engineer
- Ultronics Ltd
- http://www.senstronics.com
-Original Message-
From: Alex McNeil
Hi Massimo,
Try http://www.vtm.co.uk/.
They had a good calculation method in the printed version of their
catalog which does not seem to be available on the website ( I haven't
looked very hard for it). It worked well for sizing in-rush limiting resistors.
Regards
- Chris
-Original
Hi Kate,
Not sure about practical, but ISO 11452 Part 3 describes the calculation method
for the electric field inside a TEM cell.
It uses the formula
|E| = sqrt(P x Z) / d
Where |E| is the absolute value of electric field measured in Volts/m
P is the net power, in watts, to be
to meet the exhibition date deadline - uncropped pins violated a clearance
dimension)!
Be warned!
- Regards
- Chris
(Own Opinions Only)
-Original Message-
From: Gregg Kervill [SMTP:gr...@test4safety.com]
Sent: Tuesday, January 29, 2002 2:13 AM
To: 'Chris Chileshe'; emc-p
the limits prescribed by EN50081-1 for the range 150kHz - 30Mhz - 1GHz
stayed the same?
Regards
- Chris Chileshe
- Ultronics Ltd
- http://www.senstronics.com
-Original Message-
From: Chris Chileshe [SMTP:chris.chile...@ultronics.co.uk]
Sent: Monday, January 28, 2002 9:11 AM
Regarding products for demo's and exhibitions, Enci writes ..
Therefore the application of CE Marking or lack thereof is meaningless.
You would think so wouldn't you. A small problem arises in that if you have
competitors with a CE marked product, they will make it a point to display
this and
Andrew,
What on earth is that?
You wouldn't happen to have the harmonic spectra for these waveforms
would you? I believe the last time I saw a mains voltage fundamental
struggle so hard to make an impression was during my research days
at Uni when I had an erroneous switching pattern in an
I agree with Scott's take on this, and I can vouch for the experiences
others have cited where a seemingly suitable alternative has in reality
proved otherwise.
I have seen this with both semiconductors (opto isolators) and passives
(VSD DC link capacitors and ferrites).
If the datasheets are
There is a lot to be said for this approach.
Unfortunately, I had just sent out an e-mail on EN 61000-4-6
and EN 50141 when I started following the thread on Switch
Inrush Ratings.
I eventually came to the postings making reference to the
John Woodgate approach and realised I hadn't done all I
are essentially the same? I do not have a copy of either and
currently awaiting delivery of EN 61000-4-6 which I have
recently purchased.
Best regards
- Chris Chileshe
- Ultronics Ltd
This e-mail has been scanned for all viruses by Star Internet. The service is
powered by MessageLabs. For more
I would like to see if the one per CISPR 25 suits for this purpose or
not.
I am not sure that 95/54/EC requires you to perform conducted emissions,
but if you do, the standard will be CISPR-25, so the short answer is
YES.
Best regards
- Chris
-Original Message-
From: KC CHAN
Hi Amund,
A properly sized varistor ( sometimes with capacitor in parallel)
is quite effective. You will find IEC 1000-4-4 mentioned in some
varistor datasheets. Just mind that you have the energy rating
correctly specified and for really high speed response, opt for
surface mount.
The
Dear all,
I guess I should have known better than to open a can of worms and then
have the audacity to take a day off!! I returned today ( Tuesday) to find my
in-folder overflowing with opinions on this matter.
It is quite obvious that John's presence is treasured by quite a large
percentage
Is Minks the plural for 'Mink' or is it always Mink in both singular and
plural?
Have I been misinformed?
Regards
- Chris
_
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delivered through the
Any possibility of reconsidering your decision John?
I think it would be a real shame to lose John's presence on the list.
While it would obviously be possible for us to contact him directly
( and I for one have done so in the past), I have always found it
educational to read John's responses
Hi Group,
I have one of those scenarios where EMC meets product safety.
For the purpose of RFI, I have a requirement to connect RF bypass
capacitors from the input lines of a Low voltage DC (30V max, SELV)
piece of equipment to PE. As I recall when I worked in ac voltage
converters, we used
Bob,
You will find a very useful guide on applying the directives at the site
http://europa.eu.int/comm/enterprise/electr_equipment/emc/
It has links to both the EMC directive and the Marine equipment directive
and also a FAQ.
My understanding is that equipment specifically covered by the
Ravinder,
I can attest to the 2kV ESD immunity of ICs because I have done
such tests myself. I am now in the process of trying to raise the
ESD immunity level to 4kV on one particular pin.
Have you - or anyone else on this group - had any experience working
with small surface mount
Out of the curiosity, do they freeze the chickens complete with feathers
or do they get them ready dressed from Wall Mart?
- Chris
_
This message has been checked for all known viruses by Star Internet
delivered through the
imports, but really, the mark only has legal
implications within the EU.
I am not sure about the Russian market, and perhaps some of our Russian based
compliance engineers may help here. Alternatively, the persons importing the
product would be able to advise.
Regards
- Chris Chileshe
and hopefully will emerge with a CE marked cheque -
or CE marked letter of dismissal!! You can never be too sure with these
accounts people.
Regards y'all
- Chris Chileshe
-Original Message-
From: Ralph Cameron [SMTP:ral...@igs.net]
Sent: Thursday, September 13, 2001 4:57 PM
To: Chris
This understanding (appended e-mail below) is correct AFAIK. I also checked
out the website http://www.conformance.co.uk and they seem to agree with
the notion it doesn't really mean anything *any more*. Here is an excerpt
from
their site ..
..
We quite often get asked
.
Is there anything we can do about this?
- Chris Chileshe
- Ultronics Ltd
- http://www.ultronics.com
-Original Message-
From: Chris Maxwell [SMTP:chris.maxw...@nettest.com]
Sent: Thursday, September 06, 2001 9:31 PM
To: John Woodgate; emc-p...@majordomo.ieee.org
Subject:RE: ENV 50121-5
the usual tolerances) that in someway guarantees that any
EFTs and Surge voltages are dealt with satisfactorily i.e. not coupled
through?
Would appreciate your advice.
Best regards
- Chris Chileshe
http://www.ultronics.co.uk
become accessible during maintenance.
Hope this helps.
Best regards
- Chris Chileshe
- Ultronics Ltd
- http://www.ultronics.co.uk
-Original Message-
From: wo...@sensormatic.com [SMTP:wo...@sensormatic.com]
Sent: Tuesday, August 14, 2001 2:56 PM
To: emc-p...@majordomo.ieee.org
Kyle writes ..
Doug has touched on what I think would be a great tool for the
EMI hunter...but rather than a 'sniffer', a 'goggle' similar
to what Geordi wears that facilitates the direct viewing of EM radiation.
Ideally, the device would allow adjustable band 'viewing' of the radiation
I found the report Jack refers to on the website, and I think it is well
worth reading.
Regards
- Chris Chileshe
- Ultronics Ltd
-Original Message-
From: Jacob Schanker [SMTP:j.schan...@worldnet.att.net]
Sent: Thursday, June 21, 2001 8:39 PM
To: emc-p...@ieee.org
Subject
.
Regards
- Chris Chileshe
- Ultronics Ltd
_
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and didn't really bother finding
out where or how the ground connection was made!
Question 3: Can I connect the ground strap via say a UK 3-pin plug
(with live and neutral prongs removed) into a mains socket or is this
asking for trouble (RCD's etc).
Grateful for any advice
Regards
- Chris Chileshe
Hi group,
Sorry I haven't been able to reply to your e-mails following release
of the directive. An organisation called the RSPCT (Royal Society for
Prevention of Confusion to Teenagers) was immediately formed here
in the UK and I gather I will need to appear before a tribunal.
Now enough with
I guess we better start with the directive. Sigh! Here goes ...
__
Having regard to the existence of the net acronyms and typing shortcuts,
and in particular, the emc-pstc DL thereof,
In cooperation with subscribers, clearly frequent visitors to chat
I would be grateful if any private replies to this e-mail would be copied
to me as well.
Sounds a lot like a DC to DC converter I will be looking at in a couple
of months.
Best regards
Chris Chileshe
Ultronics ltd.
mailto:chris.chile...@ultronics.co.uk
-Original Message-
From
them, you can use them to cover
up sections of the wall disfigured by electrolyte from exploding
capacitors during surge testing.
Best regards
- Chris Chileshe
-Original Message-
From: lfresea...@aol.com [SMTP:lfresea...@aol.com]
Sent: Friday, May 25, 2001 12:35 PM
To: emc-p
experiences on suppressing these
narrowband emissions are welcome.
Regards
- Chris Chileshe
- Ultronics Ltd
This message has been checked for all known viruses, by Star Internet,
delivered through the MessageLabs Virus Control
Hi Joe,
Not sure I've understood your question correctly. Are you asking
1) If there are further tests that need to be added to your list to complete
the EMC requirements (excluding of course radiated emissions and immunity)
or
2) What extra equipment you need to perform the tests you
Hi Jim,
Try http://www.emctest.com/
The standards will depend on what needs to be tested in the room as
the field strengths, absorber materials, types of antennae and physical
size if the EUT all have a part to play.
Regards
- Chris Chileshe
- Ultronics Ltd
- Cheltenham, UK
-Original
Hi guys,
http://www.vca.gov.uk
might be a good start point.
Regards
- Chris
-Original Message-
From: Jim Bacher [SMTP:jim_bac...@mail.monarch.com]
Sent: Tuesday, February 13, 2001 5:25 PM
To: Mr. Paul Chan; emc-p...@ieee.org
Subject:Re:WVTA
forrwarding for
on the brain (calcium cell migration
leading to changes in behaviour, personality, memory etc) and
is there a standard being devised for compliance.
Regards
- Chris Chileshe
- Ultronics Limited
- Cheltenham, UK
-Original Message-
From: Hjalmar Arnason [SMTP:hjal...@tetra.is]
Sent
Thank you for the welcome and thank you to everyone who
replied to my query on the subject.
Perhaps I should have mentioned that I have spent long hours
in the past browsing the UL and associated websites for any
such standard and have not had much success.
Patty Knudsen replied and wrote
), the likes of engine management units
etc?
Would appreciate some advice.
Regards
Chris Chileshe
Ultronics Ltd
Cheltenham, Glos.
UK
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