it is. :-)
Chris Dupres
Surrey UK.
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, aging EMC
hack.
Chris Dupres
Surrey, UK.
p.s. Has anybody heard about the Bad Haircut Directive?
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-- Forwarded Message --
From: Chris Dupres, 100014,3703
TO: Dana Dorsett, INTERNET:d...@papillonres.com
DATE: 11/12/98 22:56
RE: Copy of: Re: Reducing magnetic influence on PC-monitors
Hi Dana and the Group.
Iron will attenuate a power-frequency magnetic field
more of your equipment, and will go to a competitor. Or they
won't pay you!!! :-)
Chris Dupres
Surrey, UK.
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where I can learn more?
The ERA in Leatherhead, UK, was doing a lot of work with this stuf, and had
a product.
Tel:+44 (0) 1372 367030
Fax: +44 (0) 1372 374074
Email: i...@era.co.uk
Sorry. I don't recall the chap running the group.
Chris Dupres
Surrey, UK.
-
This message is coming from
it into a 'shorted turn'
configuration. Got some interesting results, not spectacular, just
interesting
Just a twopence worth for the opinion bucket.
Chris Dupres
Surrey, UK.
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. At
different times of day I see mains hum bars going UP the TV screen, and at
other times they go DOWN. Our TV frame timebase is 50Hz.
Chris Dupres
Surrey, UK.
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with the single
' system (2. above) and I would therefore
treat it as a new unique product, and test it accordingly.
There you are, another load of unsolicited self opinionated rose
fertilizer, perhaps...
Have a nice weekend,
Chris Dupres
Surrey, UK.
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than
if those same instruments and cables are stacked on top of each other, and
yet again if that stack of instruments is housed in a 19 rack.
That's my twopence worth, look forward to hearing the views of others.
Chris Dupres
Surrey, UK.
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switches tend to be green. Washing machines and kettle switches are
often red. I find it a bit confusing trying to reconcile a switch lamp
colour with the need to use 'red for alarm', and 'green for safe'.
Is this written down anywhere?
Chris Dupres
Surrey, UK.
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This message is coming
normally, and it shows emissions right on the limit, then I think the EMC
Directive has been followed, and the equipment can be CE marked with
honesty and placed on the market.
Just a tuppence worth (what's THAT in Euro's?)
Chris Dupres
Surrey, UK.
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-- Forwarded Message --
From: Chris Dupres, 100014,3703
TO: Muriel Bittencourt de Liz, INTERNET:mur...@inep.ufsc.br
DATE: 21/10/98 19:12
RE: Copy of: Doubt on LISN utilization
Hi Muriel.
You asked:
I'm doing some tests of conducted emission using a LISN. My
Hi John.
You wrote:
It concludes the conclusion of the Working Party remains that there is
still no convincing evidence of health effects in man due to low-level,
low-frequency
electromagnetic fields.
You'll forgive the healthy cynicism of the British Public when they read
statements like that.
and a tight chest when I'm around this stuff?
Funny stuff, Ozone. Sure makes screws go rusty very quickly!
Any information anybody wants to share?
Chris Dupres
Surrey, UK.
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.
There are potted reed switch/fuse (non replaceable) assemblies on the
market that require Samarium Cobalt magnets to pull them in (not many
people carry these turkeys), and these have BS approvals for use as Guard
Interlock switches. Is this the type of thing you are looking for?
Chris Dupres
Hi Robert.
You asked:
Need to find the compliance requirements for medical therapy equipment
that uses high power X-Rays to destroy tumours. Both for US market and
the European market.
Essentially, this equipment is covered by the EC Medical Devices Directive
in Europe, and as such must comply
to prevent.
A twopence worth, perchance.
Chris Dupres
Surrey, UK.
.
But the CE mark exists primarily to ease free trade, not to prove safety or
quality.
Just an opinion.
Chris Dupres
Surrey, UK.
, I'm sure that if it was diluted the water would remain long after
the IPA had gone.
Does that make sense?.
Chris Dupres
Surrey, UK.
!
As they say, it's all there - somwhere.
Chris Dupres
Surrey, UK.
to sleep.
Hope the beads work. This seems to be a common problem.
Chris Dupres
Surrey, UK.
charger was running in the garage.
- The outside Quartz Halogen security light comes on whenever my
office lights (fluorescent) or the bathroom ventilation fan are switched
off.
There must be many, many weirder and funnier ones out there :-)
Regards,
Chris Dupres
Surrey, UK.
Hi Terry.
You wrote:
I understand in many industrial applications a low voltage DC power
supply is used to power equipment and this may be even hundreds of
feet away from the supply. The filter of the supply would not be
effective since the power supply connection /the antenna `could be'
-- Forwarded Message --
From: Chris Dupres, 100014,3703
TO: WOODS, RICHARD, INTERNET:wo...@sensormatic.com
DATE: 23/06/98 20:01
RE: Copy of: Conducted Emissions Test
Hi Richard.
You wrote:
. It is my understanding that the OEM must perform the conducted emission
-- Forwarded Message --
From: Chris Dupres, 100014,3703
TO: POWELL, DOUG, INTERNET:do...@ftc2.aei.com
DATE: 23/06/98 19:48
RE: Copy of: Ground Wire Markings
Hi Doug.
You wrote:
I was recently speaking with one of my fellow employees who previously
worked at Dell
Hi Petter.
You wrote:
What is meant by 'Functional demands'?
Could you provide a bit more detail please. I have a very small brain and
need all the help I can get
Thanks.
Chris Dupres
Surrey, UK.
you leave all that stuff off of the 'check list'.
British Standards have a draft 'Check List' in preparation, but it is
incomplete and of course covers everything, including all the stuff not
relevant to your equipment.
If you have specific questions, feel free to ask.
Good Luck,
Chris Dupres
, but the temperature correction requires look-up-tables, design
data, temperature measurement etc. etc. etc. I do electronic stuff for a
living and I wouldn't even start. :-)
Just a twopence worth of not-so-humble-opinion.
Chris Dupres
Surrey, UK.
74 JH
of anything to say.
Just a few not-so-humble self opinionated cents worth... :-)
Chris Dupres
Surrey, UK.
a dual input which provides this level of protection, many simple
guided contact relays do not.
A two cents worth, maybe...
Chris Dupres
Surrey, UK.
to a fluorescent
fitting in the Secretaries toilet!
The source may be closer than you expected.
Just a suggestion,
Chris Dupres
Surrey, UK.
-- Forwarded Message --
From: Chris Dupres, 100014,3703
TO: Farnsworth, Heber, INTERNET:hfarn...@physio-control.com
DATE: 24/03/98 22:24
RE: Copy of: CE Technical Documentation
Hi Heber.
You wrote:
Could someone point me toward definitions for the following terms
'?
Good luck.
Chris Dupres
Surrey, UK.
, and therefore be
compliant with the relevant standards.
Hope that helps.
Chris Dupres
Surrey, UK.
, then that may be a good thing.
Just a few humble, simple, thoughts... maybe a tuppence worth.
Chris Dupres
Surrey, UK.
stuff and CTI about five or six times
thus far. They were interesting the FIRST time!
Anyone else getting this phenomenon?
Chris Dupres
Surrey, UK.
a representative established within the Community appointed by a
manufacturer of electrical equipment to act on his behalf in relation to
these regulations.'
Hope that helps a bit.
Chris Dupres
Surrey, UK.
the
mains supply to the equipment. The mains cable on this thing was 3 metres
long, and made up from component's, not moulded. The screen was grounded
at the Supply end.
Interesting stuff...
Chris Dupres
Surrey, UK.
.
Route 1. above is cheapest and most risky, Route 2. is safest and most
expensive
Hope that's interesting,
Chris Dupres
Surrey, UK.
).
A thruppence worth perhaps.
Chris Dupres
Surrey, UK.
a contact backup.)
A humble opinion, a couple of pence worth perhaps.
Chris Dupres
Surrey, UK.
-- Forwarded Message --
From: Chris Dupres, 100014,3703
TO: Flinders, Randall, INTERNET:r_flind...@emulex.com
DATE: 18/12/97 06:33
RE: Copy of: Official Journal
Hi Randy.
You asked:
Is anyone aware of a FUNCTIONAL web site where I can access an updated
copy
.
Chris Dupres.
Surrey UK.
Chung, N.T.
Hong Kong,
Tel +852 2421 9898
fax +852 2421 0339
RS Components also have outlets in India, Auatralia and New Zealand..
RS Components International, in the UK (head office) is on:
tel +44 1536 201234
fax +44 1536 204237
They can probably help you further.
Hope that helps.
Chris Dupres
to Europe, it must have a CE mark and certificate to back it up.
What LVD standards do you meet?
Chris Dupres
Surrey, UK.
because in the event of a short circuit, it heals
itself, and is therefore not going to need protection. So, any caps
connected before your first fuse or MCB should be X types, or Y types,
depending on where connected. (Y's go to earth).
Hope that helps.
Chris Dupres
Surrey, UK.
, and it puts a perspective on things if we
know the source of the comments.
Just an unsolicited bar of chocolates worth from the UK.
Chris Dupres
Surrey, UK.
Email: chris_dup...@compuserve.com
tel: +44 (0) 1342 843154
fax: +44 (0) 1342 844219
mobile: +44 (0) 831 785514
page: +44 (0) 839 495284
-- Forwarded Message --
From: Chris Dupres, 100014,3703
TO: INTERNET:mvald...@netvision.net.il,
INTERNET:mvald...@netvision.net.il
DATE: 7/16/97 7:11 AM
RE: Copy of: reduction of leakage current
Hi Moshe.
You asked:
Assuming the power supplies and line filter I'm
metal parts got etched away!
Luminous signs are usually neon or a rare gas, and after switch-on must
behave a bit erratically, at least until they warm up and reach a stable
operating condition. 55015 allows for this.
Good luck.
Chris Dupres
Surrey, UK.
of these standards mention is that if you eat a PLC, it shouldn't
poison you That would be a non-compliance with the LVD!
Hmmm.
Chris Dupres
Surrey, UK.
present
on an ESD probe while it looks for a discharge path, happily the front
glass of the LCD panel is easily capable of holding off 8kV, and I've never
had an LCD driver fail due to induced energy from adjacent discharges.
(YET!)
Another tuppence worth...
Regards,
Chris Dupres
Surrey UK.
-- Forwarded Message --
From: Chris Dupres, 100014,3703
TO: Rick Busche, INTERNET:rbus...@es.com
DATE: 6/3/97 7:03 AM
RE: Copy of: Bonding of structures
Hi Rick.
You wrote about earthing screws etc.:
The intent of the toothed
washer is to bight through the paint
exactly camped on their doorstep.
If anything turns up I'll post you.
Have a nice day.
Chris Dupres
Surrey, UK.
metalwork can often act as no screen at all, but you
knew that... If you need an explanation of that effect then do please come
back and I'll try and oblige.
More importantly, for LVD or safety reasons, large metal parts should be
grounded.
Chris Dupres
Surrey, UK.
-- Forwarded Message --
From: Chris Dupres, 100014,3703
TO: Kendall Wilcox, INTERNET:kwil...@fcpa.fujitsu.com
DATE: 4/27/97 6:13 AM
RE: Copy of: Fire Enclosures
Hi Kendall.
You wrote:
No matter what the size of the openings on the top of the unit, if you
that short circuits anywhere will pull enough current
to trip the CB, but not allow the CB to trip on the switch on event. If
you do this the equipment will be both functional and safe.
That's another twopence worth.
Chris Dupres
Surrey, UK.
powered PCB, then you are
proposing a sacrificial protection device, but you're still better off with
a MOV.
Just a thought or two.
Chris Dupres
Surrey, UK.
see the files and the original OEM certificate, and the
covering document ties it all together for ISO 9000.
It worked for us.
Chris Dupres
Surrey, UK.
breakers, but you probably don't have
room, nobody ever does.
Just a tuppence worth...
Chris Dupres.
Surrey, UK
PANIC.
Chris Dupres
Surrey, UK.
required in IEC 1010-1 can be disregarded?
What do you think folks, Reasonable? Sensible? Safe? or What?
Your opinions are, as always, most valuable.
Thanks
Chris Dupres
Consulting Engineer
Surrey UK
Hi folks.
For those that know me, I'm moving out of this position to take on
more consultancy work. Therefore I'll be unsubscribing, and
re-subscribing on my 'other' Email pad.
DON'T PANIC
I know how much you all worry...
Chris Dupres
EMC Specialist. VG Microtech.
cdup
Hi Folks.
For those of you that know me, I'll be leaving this position today,
and taking on more consultancy work.
I'll unsubscribe on this email address and resubscribe on my other
address. So DONT PANIC!!!I know how much you all worry.
Take care.
Chris Dupres
EMC Specialist. VG
Hi Folk.
Anyone know if the EU Machinery Directive is available on the Net?
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vgmicrotech.com
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions expressed are personal, not necessarily Corporate'
is the users, not the makers.
Perhaps that is a gross over simplification, but that's how it seems to me.
They never had these problems with steam, or coal, or water mills, or
windmills. maybe we should go back.
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vgmicrotech.com
tel +44 (0) 1825
Warth International Ltd. fax +44(0) 1342 312969
Tecknit Europe Ltd. fax +44(0) 908 320324
All these guys do EMC screened transparent windows, either embedded
mesh or conductive coatings. Most have US outlets.
Hope it's useful.
Chris Dupres
EMC Specialist. VG Microtech.
cdup
/confpage.htm
Well, you did ask...
p.s. I don't work for these guys, just use them a lot.
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vgmicrotech.com
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions expressed are personal, not necessarily Corporate'
...
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vgmicrotech.com
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions expressed are personal, not necessarily Corporate'
that the enforcement authorities would get far more excited
if goods with CE marks were stopped at a border, than if the goods made
too much EMI.
There's a few centimes/Deutchmarks worth...
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vgmicrotech.com
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
switching SSR's are produced just for that purpose, and are, in
my experience, a God send.
Conventional resistive or loaded transformer switching can use Zero
Cross Over switching, as the I and V are in phase.
Sorry about the confusion,
Chris Dupres
EMC Specialist. VG Microtech.
cdup
a Smileycon :-)
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vgmicrotech.com
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions expressed are personal, not necessarily Corporate'
, for instance, as opposed to radiation from radioactive
material.
I think that makes sense.
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vgmicrotech.com
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions expressed are personal, not necessarily Corporate'
allows him to have two outputs, rather than one.
The question is, does the equipment need to be EMC certified and CE
marked before it's put back into service?
I look forward to the learned opinions of the group.
Regards,
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vgmicrotech.com
tel +44 (0
of which seem as if they will be repealed by 96/26/Euratom in
2000 at the latest.
In the UK we have the Ionizing Radiation (outside workers)
Regulations 1993 (Statutory Instrument 1993/2379) and a similar one
relating to Northern Ireland.
That may give you a bit of a lead.
Chris Dupres
EMC
(e.g. it mustn't spontaneously ignite or be
poisonous, etc.), and as far as I know that doesn't need CE marking.
Just a point of view.
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vgmicrotech.com
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions expressed are personal, not necessarily
have either no restrictions on use, or they're
under consideration.
So, presumeably you can do what you like in these bands, with the
attendant peril that everybody else is doing the same!
Chris Dupres
At 10:48 08/10/96 PDT, Craig M Britland wrote:
Looking for international (European
, but haven't made a procurement decision yet.
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vacgen.fisons.co.uk
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions expressed are personal, not necessarily Corporate'
test that supposition.
Perhaps everybody does that.
Question, what IS the correct protocol for replying to PSTC Emails?
Hmmm.
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vacgen.fisons.co.uk
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions expressed are personal, not necessarily
this is, and what it covers?
Thanks in excited and trepident anticipation...
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vacgen.fisons.co.uk
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions expressed are personal, not necessarily Corporate'
.
Can anybody clarify the matter for me please?
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vacgen.fisons.co.uk
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions expressed are personal, not necessarily Corporate'
/Agent takes the bullet in the event of non-compliance, so he
would be wise to get and keep a copy.
Thats a good tuppence worth...
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vacgen.fisons.co.uk
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions expressed are personal, not necessarily
at Tycon Corner
8000 Towers Crescent Drive
Suite 1350
Vienna
Virginia 22182
USA
Tel 703 760 7828 / Fax 703 761 2770
Cost is about 33 UKP.
Enjoy
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vacgen.fisons.co.uk
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions expressed are personal
)
Delta, one point earthed, centre tapped one leg earth,
Open Delta, centre tapped one side, end earthed.
...and just about every possible combination of three phases, neutral
and earth mathmatically possible! Most are used somewhere on this
mortal coil of ours.
Chris Dupres
EMC Specialist. VG
relevant apparatus by
being fixed to one of the following-
(a) the apparatus; or
(b) the apparatus'-
(i) packaging;
(ii) instructions for use; or
(iii) guarantee certificate.
Thats UK law anyway..
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vacgen.fisons.co.uk
tel
, or
a reference angle. i.e. in a pefect world we all use perfect sine
waves. Where its phase wrt voltage is placed is a Power Factor
problem.
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vacgen.fisons.co.uk
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions expressed are personal
to cut and improves finish, is
dissallowed for the same reasons - lead vapour emission during the
turning operation, but totally safe thereafter as long as you don't
weld it, or eat it.
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vacgen.fisons.co.uk
tel +44 (0) 1825 761077
fax +44 (0) 1825
it.
Therefore, the TV need not comply.
If however, the 12V psu was internal to the TV, then there is a
connection to the power distribution (i.e. mains inside), and the LVD does
apply.
Throw that one into the pit to see if it floats...
Hope San Jose was nice.
Chris Dupres
EMC Specialist. VG Microtech
. from a 1kVA transformer,
just try catching your wedding ring across those terminals and you'd
see why!
I'll be interested to see how this thread turns out.
Cheers,
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vacgen.fisons.co.uk
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions
suppose,
but those requirements are outside the scope of the question.
Hope that helps clear the mists, a bit.
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vacgen.fisons.co.uk
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions expressed are personal, not necessarily Corporate'
from HP via it's www
page ?
I've got on my desk a HP application note No. 1273, which relates to
compliance testing to IEC 1000-3-2 and IEC 1000 -3-3. I think this the
one to which you elude.
Its 56 pages, you'd be better getting it snail mail.
Hope that helps.
Chris Dupres
EMC Specialist
, think of it as
keep-out-of-jail insurance.
Just a cynical 2 cents worth.
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vacgen.fisons.co.uk
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions expressed are personal, not necessarily Corporate'
. The ensuing current
was enough to jerk the muscles in his arm sufficiently to chuck him
off the ladder, and to affect his heart.
I still maintain that safe electrical machine are the ones that are
unplugged, and that there was nothing wrong with candles.
good luck,
Chris Dupres
EMC Specialist. VG
dealing with Euro EMC and LVD is losing their marbles,
that's why we do the job, we've already lost them.
Chris Dupres
EMC Specialist. VG Microtech.
cdup...@vacgen.fisons.co.uk
tel +44 (0) 1825 761077
fax +44 (0) 1825 768343
'Opinions expressed are personal, not necessarily Corporate'
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