don't think it was prominent enough to state the position fairly.
--
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that these are typos ?
No. It sounds as though you may have a copy of doubtful provenance, e.g.
an early committee draft, passed off as the final publication. If so, it
will certainly have many more errors, which you will not be able to
detect.
--
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(s) that they consider to
be applicable to your product under the RTTED.
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the product meets the flicker requirements, i.e. the limits in IEC
61000-3-3 (including the large Amendment, of course).
--
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will junk the *whole product* if anything fails on the
board.
I've had Loctited screws hold until the head is a mangled mess or the
PEM separates from its mounting surface.
--
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Interested in professional sound
is broken - AGAIN! The IEC version was published
in January.
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the spectrum
Don't think that MPT1570 specified *requirements* for products. AIUI, it
is intended to specify the levels of disturbance that **justify an
investigation** of a complaint of interference. These levels are very
low.
--
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I read in !emc-pstc that neve...@attbi.com wrote (in 200302061923.h16JN
5k29...@orion2.ieee.org) about 'Ethernet Creepage and Clearance' on
Thu, 6 Feb 2003:
There shall be no insulation breakdown, as defined in Section 5.3.2 of IEC
60950, 1991,
That's OLD!
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or under argon.
I'd like to see some results of conductivity testing two blocks bolted
together with no surface treatment and two similar blocks bolted
together with the surface treatment of your choice. The only stipulation
is that the atmosphere is not abnormally corrosive.
--
Regards, John Woodgate
(isolation in particular) or is the
transformer sufficient?
Look in IEC/EN 60950 or UL 950.
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** for processing, including the application
of the CE mark.
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This message
conductive over time.
Is there any evidence for such an effect (assuming a normal atmosphere,
not especially spiked with corrosive gases)? I suspect not. If there is,
than many existing products may be vulnerable!
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equipment (use the mouse's
life to learn how to save human's lives).
The researchers won't be at all pleased if your monitor introduces a
stress that interferes with their experiments. To prevent this, you may
even have to surpass the 60601 requirements.
--
Regards, John Woodgate, OOO - Own
not a quality mark**, but the
retailer does need to look for, because selling a product that should
conform to the applicable Directives and be CE marked, but isn't, is an
offence.
--
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Interested in professional sound reinforcement
, but with an unpleasant fluid.
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. Well, chacun à son
gout: I'll do my best to avoid them entirely.
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I read in !emc-pstc that Barker, Neil neil.bar...@e2vtechnologies.com
wrote (in 4f826f960057d4118ec3009027e2453808a52...@whl17.e2v.uk) about
'CE marking and additional information requirements' on Wed, 5 Feb 2003:
John Woodgate wrote:
I read in !emc-pstc that Neil Helsby nei...@solid-state
it.
This is quite independent of 'placing on the market' and 'taking into
service'.
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.
Not a great deal, because you haven't quoted ANY of the message to which
you are responding, and you appear to have changed the subject line so
that there is no thread to trace back.
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is proposed is a *new test*, which, if agreed, in IEC is very
likely to appear in UL6500 if it is not already there. Test current may
be 200 A, or 1000 A in some cases.
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Interested in professional sound reinforcement
I read in !emc-pstc that Ted Rook t...@crestaudio.com wrote (in
se3f8562@peavey.com) about '50Hz remark' on Tue, 4 Feb 2003:
I'm referring to the basic frequency difference only,
OK, I thought maybe there was more.
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compliance status.
The CE mark is aimed at customs officers and regulatory authorities, and
not to the end-user.
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PLEASE do
in Compliance, Conformity, or Printed Circuit design magazine.
Please also send them to your experts on your TC108 national committee.
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industrial computers in a UL 508 complete
product ?
You would do well to actually ask UL. They *like* to be asked, it makes
them feel wanted. (;-)
And they will certainly tell you, with complete authority, whereas we
can only advise.
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to be a standard. (;-)
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board would stand the
test that the test sample passed. In this case, I don't think
potentially destructive sample testing is adequate, either. The PEC
needs to be 'four nines' reliable.
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Interested in professional sound
,
you might need a 75 A 3-phase supply. Think of separate boxes,
flickermeter and harmonic test set. Note that the latter should conform
to the recently revised IEC 61000-4-7.
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Interested in professional sound
(
However, there are some mirror sites that DO have the complete documents
downloadable. Unfortunately, I can't give you a URL.
--
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matters is the trip
TIME. The board trace may stand 200 A for 50 ms but not for 100 ms.
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may
require more information.
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This message is from the IEEE EMC
Broadcom rep to
get it.
Why would a supplier make its product support information hard to get?
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fuses may
remain intact while magic smoke is emitted by parts that the fuse is
meant to protect.
[snip]
And of course there is the 50Hz issue which is not trivial for linear power
supplies.
What 50 Hz issue? Just that it's not 60 Hz, or something more subtle?
--
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while it is powered.
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than 10 days for the result to be put on
the IEC web site.
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by it,
or it's a knee-jerk reaction to the incident. Two months, one of them
August, is a VERY short time in the world of standards.
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but didn't get
round to it.
The EMC Directive doesn't apply to products for use in vehicles, but I
doubt that the charger would pass the Automotive Directive (which
contains the technical requirements).
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested
. (;-)
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not
comply with a requirement.
Was there a name? I didn't see one. If there was, it certainly raises
serious legal issues in UK. It's called 'defamation of goods'.
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Interested in professional sound reinforcement
are supposed to be signed off
by the EMC authorized person as either not requiring re-testing or have
been proved with re-testing**. Same for safety.
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Interested in professional sound reinforcement and distribution
are a poor excuse.
I'm talking cheap/dirty and quick...no display, no readout of actual
level...an
antenna, an amplifier and a go/no-go indicator.
Yes, wouldn't it be good. IMHO, it's slightly less feasible than a
combined 3D photocopier and perpetual motion machine.
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Regards, John Woodgate
, the pilot was John
Mccain, now Senator John McCain.
Missed! (;-)
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failing to
achieve it.
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that.
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or risk to human life comparable with the penalties you propose?
Remember, every penalty you apply to a company ends up with either its
employees losing their jobs or its customers paying higher prices. So,
who would benefit from your proposals, apart from test-houses?
--
Regards, John Woodgate
wavelength, you probably don't need a large
chamber. But absorptive materials may be costly.
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studied.
Experience has shown that a CE marked CPU unit will be close to the limit.
However, plug another CE marked unit in - printer or monitor or mouse and
..
CISPR 22/EN 55022 requires testing of products with typical peripherals
connected.
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.
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wasn't even allowed
to operate an unmodified, approved product!
ENDQUOTE
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at a distance of 2m (from
the corner of the chamber).
Can you get a telephoto adapter for the camera?
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not at the test levels required in
some national standards.
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, approved product!
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that's what you are measuring? Check the site background.
Do you listen to 4 by 2s as well, my life?(;-)
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PLEASE do
are common between projects.
This commonality can be exploited to increase efficiency for individual
projects and across sites.
Fair enough.
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or hazardous?
The Commission's decision rejecting the EN should have included
information on how its requirements can be satisfied. If it does not, a
fair test would be to get your least-favourite member of the Commission
to eat some of the packaging. (;-)
--
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proportional.
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it will not burn anyway, or
the retardant will not stop it burning.
I think you have to ask what happens with plastics A to Z with
retardants 1 to 10, and get 260 answers (or not).
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Interested in professional sound reinforcement
to the
environment, you need to know EXACTLY what is in that environment, how
much of it and its potential effects on the hundreds of materials used
in modern electrical equipment.
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Interested in professional sound
don't
think there is any solution except PFC. If in fact, the product is
'professional' as defined in clause 3.15, then no limits for harmonics
apply. You must describe it as a 'product for use in trades, professions
or industries' in the user's manual.
--
Regards, John Woodgate, OOO - Own
Agency in UK.
I suspect the concession is that if you don't violate Article 4 of the
Directive, you are OK, BUT I DON'T KNOW THAT FOR SURE.
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the questions
above and then we'll see what can be done.
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This message is from the IEEE EMC Society Product Safety
Technical Committee emc
a highly-efficient 75 W DOL SMPS, the inrush current may
well be enough to cause a big voltage change. That in itself is enough
to warrant an examination of the schematic etc.
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Interested in professional sound reinforcement
.
However, having 'sensible' and 'Directives' in the same sentence is
something of an oxymoron, so if anyone who has a definitive answer would
post, it would be very helpful.
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Interested in professional sound reinforcement
on 01-10-2004.
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, but there were red faces all round about 3
months ago about the rating of 2.5 mm squared flat twin and earth,
because it was inconsistent with the breaker rating for ring-mains.
IIRC, the basic 'ampacity' (a term not used in British English) was
increased from 21 to 22 A.
--
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Newark/Farnell?
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Reference.
BS 7671 (the UK version of IEC 60364) has a lot of information on this
subject. I suspect it's also in IEC 606364, but I haven't looked.
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nevertheless occur on a
transient time-scale in industrial areas.
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direction.
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work for gamma rays.(;-)
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for the '3 V/m' reduced
test level, for which I bear a small part of the responsibility.
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? (;-)
Am I the ten millionth person who asked?
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of the antenna support - called 'umbrella
effect'.
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in the data books? Those that are
full of fine print about precise mechanical dimensions, soldering,
reliability, meanings of figures in data sheets (if any) etc., etc.
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the successor document!
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the transistor.
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at least a different impression, if not contradictory
requirements.
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230V tolerances.
You could probably get away with that in most cases, but some standards
require testing at 230 V +/- 1% or something similar. 220 V is not
acceptable anywhere now, AFAIK.
--
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Interested in professional
/ 50 Hz. Auto switching power
supplies
(or power supplies with a manual input voltage selector switch). 1 SKU
for
manufacturing to track. Ship it anywhere. That's the advantage for
manufacturers who ship around the world.
230 V, not 220 V.
--
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the encapsulation doesn't necessarily pass insulation tests, and
could be broken in service.
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I read in !emc-pstc that drcuthb...@micron.com wrote (in CFEFA50C9BCAD2
1197470001fa7eba6b14121...@ntexchange05.micron.com) about 'EU Language
requirements for Manuals' on Tue, 29 Apr 2003:
Where would one find a translator for Elbonian?
Ask on sci.lang.translation.marketplace
--
Regards, John
the capacitances are the dominant transfer
router.
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ARE CONSISTENT
IN THIS RESPECT.
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in his LED (LEDS?). That's 14.7 W in the 120 ohm
resistor, and 42 V dropped across it. Also, he mentioned only one 4.7 uF
cap.
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the original Generics were more practical.
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too late afterwards!
It's acceptable for that standard, because the purchasers of the
products have technical knowledge, allowing them to determine if the
published degradations are acceptable for a given application. It
wouldn't work for consumer products, hence EN 55020.
--
Regards, John Woodgate
that's grey and fuzzy.
(;-)
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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This message is from the IEEE EMC
, the large amount of text
that is devoted to the immunity issue.
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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requirements for electrical equipment for measurement,
control and laboratory use - part 1 general requirements) are derived i.e.
are there other standards below 61010 in this respect?
Look at IEC 60664 (multi-part).
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested
that performance degradation is defined by the manufacturer.
It's far from nonsense. The texts you refer to admit the possibility
that the manufacturer does not define the permissible performance
degradation.
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested
that matches the definition.
Isn't this backwards?
Shouldn't a symbol be validated by showing the group
the symbol and then asking for the meaning?
No, because they get too many wrong answers that way!
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested
by the word
'persist'? We have to guess.
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This message is from the IEEE
supply that?
Whoever represents US interests on IEC SC3C working groups, responsible
for IEC 60417. Maybe. But if no-one does
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Criterion B. If it does matter, it's
C.
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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This message is from the IEEE EMC
7671 is a *UK interpretation* of HD384 and IEC 60364. Other
interpretations, significantly different, apply in other European
countries.
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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,
Well, I hope you find them helpful, if not necessarily pleasing.
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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resistance is out of
the picture, and I can live with a couple of dB of insertion loss. Thanks
for the idea.
There are special diodes (not PIN diodes) made for switching at UHF, in
TV tuners for example.
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested
care
of this problem.
Japanese or Chinese is much better. You only need two Kanji characters
to convey a three-volume novel. (;-)
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested in professional sound reinforcement and distribution? Then go to
http
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