To detect shorted turns, measure the input current. It will be much
larger if there are shorted turns.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2017-12-20 14:18, Scott Xe wrote:
Thanks for all helpful replies! I will look into the
I will ask someone who might know. It's not a good scenario.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2017-12-20 21:13, Kunde, Brian wrote:
It will be difficult for me to ask what I want without insulting California
Instru
time.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2017-12-20 21:13, Kunde, Brian wrote:
It will be difficult for me to ask what I want without insulting California
Instruments (Emetek), so I apologize in advance if I fail. For those of
Watch out! We'll get someone from Yorkshire saying that they still have
to use QDOS. :-)
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2017-12-20 21:23, James Pawson (U3C) wrote:
Full sympathies. Currently Win98 here!
James
California Instruments / Teseq measurement unit. I
attach a couple documents with screen shots and a sample test report. //
//The software for the new product is supported / owned / copy righted
by CNS Inc./
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh
Sorry, I forgot about the attachments. I think the best way to go is for
anyone who wants them to ask Mathieu by email.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2017-12-21 16:08, John Woodgate wrote:
I asked Mathieu van den Bergh
I recommend that you discuss these issues with Mathieu direct. FYI, he
is one of those who is continually commuting around the world, so you
might have to wait a few days for a reply.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2017-12
Looks good to me. Too often this sort of thing is not well documented,
but here is a welcome exception.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2017-12-30 16:26, Bart De Geeter wrote:
Hello David,
I would refer to the following
HNY to all. I am having trouble finding the latest OJ list. I keep being
directed to pages that no longer exist. Can anyone please help?
--
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
Thank you very much.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-01-03 10:38, Dürrer Bernd wrote:
Hi John,
try
http://ec.europa.eu/growth/single-market/european-standards/harmonised-standards/
and for EMC
https://ec.europa.eu
Plenty of information found by a Google search. For example:
www.synflex.com/en/produkte_pdf/?id=5&areaid=wickeldraehte
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-01-03 15:33, Scott Xe wrote:
What are the maximum temperature
Philosophical issue there. If the field is really static, what changed
to cause the spark to happen when it did, rather than at some other
time? (A cosmic ray would breach the stasis.)
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018
If the charge is still building up, the field is not static in the
region close to whatever the charge is building up on. Just a
philosophical point.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-01-07 14:28, Ken Javor wrote:
Re
Agreed. Not very static.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-01-07 15:15, Ken Javor wrote:
Re: [PSES] ESD question If the charge were truly static, and the
charged surface topology were truly static, then things should
IEC 61000-4-6 might be of some help.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-01-11 13:23, John Mcauley wrote:
Hi All
I am trying to correlate the conducted levels induced on
telecommunication cables, e.g. unscreened twisted
I looked at the published 1996 First Edition, but there is nothing
there. The long Note in the Scope clause was there, not surprisingly. Of
course the assumption is just that - an assumption, open to challenge
but necessary in order to achieve a useful result.
John Woodgate OOO-Own Opinions
'look' = 10 s, ''stare'
= 30 s. A 'look' may be long enough to cause permanent damage.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-01-21 20:48, Charlie Blackham wrote:
All
Class 2 lasers are r
As far as I can see, these delayed updates may be made at any time, with
no notice, so it would be prudent to assume that it will happen next
week, and consider the consequences.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-01-25
It's probably another case of the 80/20 rule. Even with peer-reviewed
papers, the long-term opinion may be that 20% at most were of value.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-01-27 19:27, Douglas Smith wrote:
Great
From the public part of the IEC web site, the FDIS is still at editing
check, so hasn't been circulated yet. To find Previews, go to www.iec.ch
and open Webstore. There is a list of available pre-releases (PRV
documents).
John Woodgate OOO-Own Opinions Only
J M Woodgate and Assoc
some protection against electric shock, although the latter
is compromised so as to prevent nuisance-tripping, which would occur if
the trip were set at say 5 mA to give much better protection.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On
We have an expert on electric shock here, so I won't go further than to
say that the effect of 30 mA depends very much on how much contact area
there is, where it is and for how long contact lasts. I am surprised
that 6 mA doesn't result in nuisance tripping.
John Woodgate OOO-Ow
You can rely on the recent post in this thread by Pete Perkins.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-01-31 15:52, Kunde, Brian wrote:
Thanks for the input everyone.
I know that GFCI protectors in North America will trip
-sockets to include RCDs, and an RCD at the distribution panel. I
don't know of any requirement in any British Standard for an RCD inside
load equipment.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-01-31 17:06, Kunde, Brian
Pete Perkins IS the expert.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-01-31 18:02, Ralph McDiarmid wrote:
“current limit of 30mA protects 95 % of the population”
They didn’t want to try for 100% ? I'm no expert and I
ety requirements for products are in product
safety standards.
In Europe, a cut-off saw is a 'machine', so the Machinery Directive
applies. This influences which safety standard is permitted to be
applied to the product.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.
and garden machinery - Safety - Part 3-1: Particular requirements for
transportable table saws
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-01-31 18:57, John Woodgate wrote:
IEC 62841 is a multi-part standard with 23 documents. But it&#
It must mean that the tool can be moved about because it is not attached
to the building. From the IEV (not an infallible source):
IEV ref 151-16-45
transportable, adj
capable of being moved from one location to another, generally
by using vehicles
John Woodgate OOO
There is a motor and a blade, which both move and are linked. In a
cut-off saw, If I have the term right, the whole motor and blade housing
swings on a pivot at the back of the baseplate.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On
Another case of the IEV having a different definition from that used in
the industry!
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-02-01 02:10, Mike Sherman wrote:
A copy of what I inadvertently only sent to Brian earlier
I didn't see an explanation from Doug about the open-ended shield of a
balanced twisted pair being OK. Did I miss it or is the solution still
awaited?
--
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Ess
willing to take action. Tradition, you know.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-02-19 05:45, Scott Xe wrote:
Insulation resistance test is one of most common safety tests
nowadays: Flash test, earth continuity test, leaka
1.8 megohm insulation resistance passes 1.67 mA at 3 kV.
As I said, it would be most unusual for a non-faulty modern product to
show an insulation resistance as low as 1.8 megohms (if discharge
resistors are disconnected).
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates
were often not taken into account in design, leading to
surface tracking followed by smoke and flame.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-02-19 10:02, ce-test, qualified testing bv, Gert Gremmen wrote:
As far as I
Hello, Rich. This puzzles me:
Or, it can fail the insulation resistance measurement yet pass the
dielectric strength measurement.
how can that happen?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-02-19 21:53, Richard Nute wrote
Yes, it would be possible in that case, but IR limits are mostly set
(incorrectly now) to 1 megohm or 2 megohms.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-02-20 00:24, Richard Nute wrote:
Hi John:
Depends on what limits are
Although I expect TC62 will do its own thing re IEC 60601, IEC SC77AWG2
is also studying new flicker phenomena.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-02 19:31, Brian O'Connell wrote:
Good People,
Thanks to the h
A Swede, perhaps.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-02 19:50, Jim Hulbert wrote:
Did you get replies from other than humans?
Jim Hulbert
-Original Message-
From: Brian O'Connell [mailto:o
+/- 20% doesn't seem to be enough to explain the reported result. After
all, assuming the +/- 20% is off the spectrum analyser, 1.2 is +1.6 dB
and 0.8 is -1.9 dB. These are small, but not negligible. If the +/-20%
relates to power, they are even smaller in dB, of course.
John Woodgate OO
See below.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-05 18:10, Patrick wrote:
Well, some of us have to consider other requirements, not just EN's.
What if the test is -461, or DO-160 ?
And what if the requirement is 20
ection in
some places but less in others. You can get a rough idea by looking at
one of those pictures of the field of a bar magnet disclosed by iron
filings. Relatively well-behaved to the East and West, but spiky in the
extreme close to the poles.
John Woodgate OOO-Own Opinions Only
J M Woodgate
it would be up
to a regulatory authority to challenge that. It seems unlikely that UL
2367 would be deficient, since this is a precaution against fire, which
is a major concern of UL, of course.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
can rarely have too
much documented justification.
The specific answers:
1. Yes.
2. Yes, add them, providing it is documented that the non-conforming
labels are not contradictory or confusing. Can you superimpose the
correct labels?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates
in
CISPR 16-1 are 'hands-off' because of this, even though some are very
vintage indeed.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-07 14:52, Patrick wrote:
Hello Ed -
Great story- thanks for sharing!
Just last yea
Probably some fail-safe, some reliable. I think that this is why
'safety' involves risk-assessment, not just meeting standards.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-08 21:41, Richard Nute wrote:
In my ear
hance
of power-cross is larger and it will remain *undetected* until someone
touches both the SELV and earth.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-13 19:13, Richard Nute wrote:
Dear Mr. Vyas:
I suggest you review the defin
I suspect that the SELV circuits of an electricity meter never leave the
enclosure, so SELV is OK, but PELV would still be equally safe or
better, even if a very low probability open-circuit earth occurred.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
See below.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-13 19:57, John Woodgate wrote:
I suspect that the SELV circuits of an electricity meter never leave
the enclosure, so SELV is OK, but PELV would still be equally safe or
) but that is probably a rare case.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-14 22:28, Kevin McCandless wrote:
Hello Experts,
I didn’t see my first request show up in my inbox. So I’m trying again…
A customer in Turkey has s
The new series, 63044, are based on the corresponding IEC standards, as
you can see by the leading '6'. The older series, 50491, are home-grown
(in Europe) CENELEC standards, as you can see by the leading '5'.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associ
extensive and to detailed to recount. And
'major' is a dangerous word. A big change might not affect your product
but a small change could put it off the market until it's fixed.
3. Yes, after a lot of headless chicken, it is.
John Woodgate OOO-Own Opinions Only
J
If ntueeestud...@yahoo.com is a genuine student, some NCs will look more
favourably on a request, especially if supported by a tutor. But not all do.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-18 19:59, Ghery Pettit wrote
duced new
ways that non-members of committees can see and comment on documents.
See the web sites for details. This may require a lot of 'burrowing'.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-19 14:51, Robert Jo
IEC 60335-1. So it is perhaps not unreasonable to put immunity
requirements into that publication if they are not in CISPR 14-2. But if
they are not in CISPR 14-2, why aren't they?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-
If I remember correctly, the text in 60335 was prompted by an incident
in Denmark where a toaster incorrectly switched on due to EMI. Since the
work was done under pressure, it might not have been done in the most
appropriate way, but the end-result is as intended.
John Woodgate OOO-Own
authorities in one or more MS that have
incorporated the Directive.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-24 14:08, Scott Xe wrote:
Before the effective date of an EU Directive such as LVD, the member
state must transpose
In the UK, many Government publications are available in English, Welsh,
Scots Gaelic, Arabic, Hindi and Urdu, occasional others, such as
Polish. So far, few are available, I think, in Manx, Cornish and
British Romany, but that could change.
John Woodgate OOO-Own Opinions Only
J M Woodgate
construction than electronics.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-26 15:45, Ken Wyatt wrote:
Hi All,
I’m still looking for a writer that is well-versed in EMC filter
design that can produce a white paper for ITEM Media (paid gig
You are likely to find the IEC Technical Report TR 62493-1 helpful. Do
you know how to use the IEC Webstore to find out about IEC publications?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-29 15:27, McCallum, Andy wrote
any more
safety testing.
If anything included uses 'wireless' (that magnetic induction or
radio-frequency, but not infra-red) the RED applies to that product only.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-30 18:27, Chest
om LEDs, but no
specific requirements for IR interfaces. EN 55032 and EN 55035 apply in
Europe and CISPR 32 and CISPR 35 in other countries. Again, the EN and
the CISPR standards are not exactly the same.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleig
I once had a DPDT knife switch with ceramic base and insulators. Rather
big, though.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-04 04:01, Richard Nute wrote:
Need a switch
Hi Ken:
I interpret your requirement as DPDT, with 3
.
You can find details of these standards from the public parts of the
CENELEC (TC106X) web site and IEC (TC106) web site.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-04 13:38, Grace Lin wrote:
Dear Members,
Is there any
workers to the risks
arising from physical agents (electromagnetic fields) (20th individual
Directive within the meaning
of Article 16(1) of Directive 89/391/EEC) and repealing Directive
2004/40/EC
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
ctive. The involvement of the RED is ONLY Article 3 1 (a),
which applies the LVD without its low-voltage limit. Nothing else of
the RED is relevant.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-04 14:51, Michael Derby wrote:
John,
I
two arcuate strips of (preferably) phosphor-bronze, to make contact
with two pairs of adjacent studs. A 90 degree rotation changes the
connections as you want. Supporting structure for the spindle and square
left to your ingenuity. You might be able to make it a bit smaller than
I suggest.
John
Yes, well, it's typical obscurantist wording. The LVD DOES apply, but
without its low-voltage limit. That is what Article 3 1 (a) says, quite
explicitly.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-04 16:33, Charlie Bla
OK, the LVD does not apply, but all its provisions apply. Is that
pernickety enough?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-04 16:57, Gert Gremmen; ce-test wrote:
The LVD does NOT apply.
For elektrical safety and EMC the
siderations, but
a Guide should be in the plainest language possible, not be cryptic.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-04 21:05, Michael Derby wrote:
Hello Matthew,
Yes, I think you’re right that they mean broadcast ‘
eryone
knows that the rest of the sentence is true, whether one is exposed to
EMF or not.
Alternatively, you can believe that the relevant IEEE and ICNIRP
research reports are all falsehoods.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
O
there is no more appropriate Directive..
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-05 07:43, Seyff Peter wrote:
Colleagues!
We are producing termials for luminaires.
Therefore we also provide a test adapter for our customers.
ICNIRP can be investigated at:
https://www.icnirp.org/en/about-icnirp/funding-governance/index.html It
should be noted that IEEE concluded that recommended limits higher than
those of ICNIRP are acceptable.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh
Native English speakers are involved, also costly language consultants.
There is no excuse for bad wording but it's tolerated too much.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-06 08:30, Michael Derby wrote:
Typicall
It may also be significant that the Council of Europe disbanded the
committee that produced that resolution. Post hoc is not necessarily
propter hoc, but on the other hand, it often is.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018
PSRR
- none at all.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-07 17:41, Ken Javor wrote:
Power Integrity Question There are many learned
books/papers/discussions on how to achieve proper power integrity by
way of proper P
A specific target would typically be 'less than 1/3 of the value known
to just provoke trouble'.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-08 04:25, Ken Javor wrote:
Re: [PSES] Power Integrity Question If the ans
e the pass-band, it is an antenna connected to a diode. And
yes, it can pick up power rail noise.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-09 04:27, Doug Smith wrote:
Hi Ken and the group,
Many analog circuits, as well as the an
That should be warned about in the data sheet. Internal EMC problems
tend to be rare, which is good, but because they are rare, there should
be warnings if they can occur.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-09 13:19
There is obviously no unique answer. You can:
- not use USB and provide a charger with a unique connector (my choice);
- use USB, but put full overvoltage and overcurrent protection in your
product;
- rely on warning notices (not recommended!)
John Woodgate OOO-Own Opinions Only
J M
dily; how do you
test *objectively* the adequacy of a symbol like the ! in a triangle,
meaning, well, I think it has had more than one meaning over the years?
I do wish there was a way of eliminating it, but I don't see one.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates w
Thanks for the explanations. However, I still think that at some point
risk assessment is inevitable.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-17 00:22, Richard Nute wrote:
… how do you test *objectively* the adequacy of a
hange.
Do we rename the list 'IEEE Philosophical Society'?(;-)
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-17 20:24, Nick Williams wrote:
In the medical device context, no this is not correct because the
failure of t
IEC 60512-23-3 might be of interest, but I don't have a copy.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-19 16:23, Grasso, Charles wrote:
Hello all,
In lieu of using shielded chambers/spectrum analyzers and such, has
a
Go to:
http://www.iec.ch/dyn/www/f?p=103:22:0FSP_ORG_ID:1247
and look for publications in the 62153 series. There are several.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-20 16:05, Grasso, Charles wrote:
Re: [PSES] Using a
It depends on the opinion of the regulatory authority in the country of
sale. In Europe(applying the EN versions), it is the manufacturer's
responsibility to justify and document the decision on partial testing,
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjo
Do you even need to justify not testing,if it doesn't produces
troublesome emissions? The only justification I can see might be that it
is used only for periods of a few minutes a few times a year.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh,
By 'troublesome' I meant 'emissions over, or too close to, the limit,
that can't be easily reduced.' If the emissions are low enough or can be
made so, why bother to ask about need to test?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.
You might ask the manufacturer of the LISN. Maybe it's faulty.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-26 11:32, McBurney, Ian wrote:
Dear Colleagues.
I am setting up a mains conducted rf emissions measuring system a
It's rather unusual; what have you got in the factory that might be
causing it? Can you try powering the LISN from a spur taken directly
from the main breaker box, with nothing else connected to the spur?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Ray
If so, have you got a bigelectronic motor drive (VSD?) nearby? They
/should/ be assessed, at leas for conducted emissions, after
installation, but
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-26 15:24, McBurney, Ian wrote
Very good advice. Actually, there are grounds (!) for using a balanced
filter, i.e. inductors in both L and N.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-26 19:20, Edward Price wrote:
*Ian:*
**
*It sounds like the low-pass
ndicates in itself a need to
fully test.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-27 11:45, Matthew Wilson wrote:
You ask for opinions so I’ll give mine, based on the device needing to
meet the EU EMC directive as you me
#x27; from
the drop-down menu.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-05-03 04:53, Amund Westin wrote:
ETSI have published the EN 300 019-series which describes
environmental tests (climate, vibration, etc.) for telecom e
Let us know if you find any. The last time I looked, I didn't find. Not
like EMC training, which is widely available.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-05-04 18:00, Kevin J Harris wrote:
Hello
I am lo
ination of top, bottom and side openings
for fire enclosures;
– alternative requirements for sound pressure.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-05-04 18:53, Charlie Blackham wrote:
Kevin
UL run a two day course on 6236
et to
the advanced tests.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-05-04 19:24, Brian O'Connell wrote:
The annual PSES and EMC symposiums are the premier venues for compliance
engineering. That said, the PSES symposium sessions
hours, and even over two days, that's exhausting. It is much better
to contribute by correspondence (email).
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-05-04 19:56, Bender, Curtis wrote:
A good training method is to join a
otherwise it would never hope to finish its agenda.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-05-04 21:35, Richard Nute wrote:
/In general, you are right, but IEC TC108 and its Hazard-Based
Standard Development Team, responsible
It's not aEuropean committee, it's an IEC committee, and that's 85
countries, see http://www.iec.ch/dyn/www/f?p=103:5:0##ref=menu When it
comes to safety, almost every country that has a functioning national
standards body wants to take part in the IEC work.
John Woodgate O
It depends on what the product does. if it is a 'consumer' type product,
you are right. If it's concerned with communication (including emergency
communication) or navigation, then special standards apply, especially
if the product is a fixture in the boat.
John Woodgate OOO-Ow
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