Re: [PSES] Doubts on RF generator problem

Your generator is damaged: there is probably an open-circuit after the attenuator, maybe at the back of the output connector. Connecting the generator to a high-impedance load cannot damage it. It is no more harmful than operating the generator with nothing connected to its output. John

Re: [PSES] Customer Requests for Risk Assessments

I agree. You may be able to make your published RAR somewhat more meaningful than others, without disclosing sensitive information. This would be a marketing advantage. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-05-17 19:56, Ken

Re: [PSES] Customer Requests for Risk Assessments

An engineer and a lawyer argued about whose was the oldest profession. 'The creation of the Universe itself was obviously an engineering task', said the engineer. 'Before that there was only chaos'. 'Who do you think created the chaos?' said the lawyer. John Wood

Re: [PSES] Customer Requests for Risk Assessments

Don't ask for the whole RA, just ask for clear statements about points than concern you. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-05-17 20:27, Nyffenegger, Dave wrote: Re: [PSES] Customer Requests for Risk Assessments Th

Re: [PSES] FW: Industrial Printer

The manufacturer can choose which standards to apply. There is no point at all in applying two emission standards. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-05-24 06:01, itl-emc user group wrote: An industrial printer has been

Re: [PSES] FW: Industrial Printer

EN 55024 has only a very limited future life. I would not recommend applying it to a new product. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-05-26 08:50, Gert Gremmen; ce-test wrote: Hi David, CISPR 32 is not relevant as this

Re: [PSES] Automotive EMC question

ring, the grounding should be good up to at least 1 GHz. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-06-12 22:41, Ken Javor wrote: Automotive EMC question The CAN bus spec says that shield(s) are to be grounded at one end only. How

Re: [PSES] Automotive EMC question

If capacitors do not work, there must be another solution, and it must be known, because it is in use. Perhaps you could dissect your own (or preferably someone else's) means of transport to find out. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Ray

Re: [PSES] Spectrum Analyzer bandwidth for CISPR 12

Doesn't the relation depend on the order of the filter? John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-06-14 14:45, Cortland Richmond wrote: See https://community.keysight.com/thread/18502 excerpt from an answer to a question:

Re: [PSES] ESD question

Probably handed down on a stone tablet in 1910 and no-one had the courage to challenge it yet. (;-) John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-06-19 21:18, Ken Javor wrote: ESD question Anyone out there know the origins of the 150

Re: [PSES] ESD question

x27;t be changed. The question, 'Cui bono?' ought to be asked a lot in EMC committees. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-06-19 21:34, Ken Javor wrote: Re: [PSES] ESD question What with Doug Smith being active i

Re: [PSES] ESD question

ve been known to liken most of EMC testing to 'measuring jelly (Jello) with a micrometer'. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-06-19 22:05, Ken Javor wrote: Re: [PSES] ESD questio

Re: [PSES] ESD question

re-squared) of some sort. I'm not sure what pF/ns would represent. Of course the capacitance of a spherical grandmother of any radius is 1 nanafarad. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-06-19 22:06, Doug Smith wrote:

Re: [PSES] ESD question

e of 300 pF (but  I don't trust my arithmetic this early in the morning). John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-06-20 00:10, Doug Smith wrote: Hi John and the group, Actually I was just kidding everyone. But I am going to sta

Re: [PSES] ESD question

urned up who couldn't work it.  We found it necessary to double the sensitivity again.  If you think about a person standing in the ESD field asa large (poorly-) conducting body, you can see why the effect can occur. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.w

Re: [PSES] RED products in EMC compliance part

I think you can consider that until EN 55035 is listed in the OJ, there is no official docopocoss (Date of cessation of presumption of conformity of the superseded standard) for EN 55020, so you can still apply it. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates

Re: [PSES] RED products in EMC compliance part

Yes, EN 55035 is listed under the RED, but there is no docopocoss for 55020 cited, possibly because 55020 was never cited under the RED.  So the only place to look for the docopocoss is the EMC list, I suggest. Otherwise it's in a sort of limbo. John Woodgate OOO-Own Opinions Onl

Re: [PSES] RED products in EMC compliance part

Yes, the Commission does not always make the docopocoss the same as the dow.  The situation is known to be unsatisfactory, due to the Commission changing its criteria for listing standards in the OJ. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh

Re: [PSES] EMCD harmonised standard references out of date standards

450> John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-07-02 20:22, James Pawson (U3C) wrote: Hi folks, Product in question is a masthead amplifier, previously tested to EN 50083-2. This standard (still listed in OJ for EMCD)

Re: [PSES] EN62311 - Human Exposure to Electromagnetic Fields

It applies to any LVD product, but there is a flow chart that shows that a simple assessment is possible if the product has no reasonable likelihood of producing sufficiently strong EMF. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018

Re: [PSES] EN62311 - Human Exposure to Electromagnetic Fields

'safety factors' because research is ethically challenging, and adverse health effects are widely attributed to causes other than the real ones. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-07-05 15:32, McCallum, Andy w

Re: [PSES] EN62311 - Human Exposure to Electromagnetic Fields

, insomnia, general malaise) were very likely much more due to poor working conditions and job interest, but the unions are very powerful. You can't subject people to increasingly strong fields until they show a reaction, it would be highly unethical. John Woodgate OOO-Own Opinions Only J

Re: [PSES] EN62311 - Human Exposure to Electromagnetic Fields

be regarded as horrifying now.  If that reduced my intellectual capacity, much is explained.:-P John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-07-05 20:12, John Woodgate wrote: Yes, there are very big 'safety factors' built int

Re: [PSES] FW: [PSES] EN62311 - Human Exposure to Electromagnetic Fields

Sounds a bit fishy to me. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-07-05 22:43, John Allen wrote: In other words, become an "aquaphibian"/(or something like that :) )/ – “back to the Future” J -Original Message

Re: [PSES] AW: [PSES] EN62311 - Human Exposure to Electromagnetic Fields

It isn't appropriate to refer to the ICNIRP publications. The correct reference (for Europe) is to EN 50527-1 and EN 50527-2-1. Unfortunately, these are not available free of charge. However, they are available at reasonable prices (in English) at https://www.evs.ee/shop. John Woodgat

Re: [PSES] ETSI EN 302 066-2 & the RED

This standard is ten years old. A lot has happened since then, and the document is clearly very minimal. I suggest you enquire on the ETSI web site about any plans to update or replace the standard. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex

Re: [PSES] ETSI EN 302 066-2 & the RED

Note the change of title and the switch from part 2 of a multi-part standard (302 066-2) to a single standard (302 066). John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-07-10 02:20, Larry K. Stillings wrote: Hi Chet, ETSI did

Re: [PSES] EMCD harmonised standard references out of date standards

on is allowing a deadline of a year, which is realistic, but even that might be difficult to achieve. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-07-13 07:55, James Pawson (U3C) wrote: John et al, I’ve had an update from a contact a

Re: [PSES] Safety design of shutter opening

marketing of such a device might violate the GPS Directive in Europe, although that is not certain because unshuttered sockets are legal in some EU/EFTA countries. Since it  only affects those countries that use the BS136X system, the appropriate regulatory action may be problematical. John Woodgate

Re: [PSES] Safety design of shutter opening

GPS applies to anything; that's why is called 'General...'. Anything can fall within more than one Directive, in fact allelectrical products fall within both LVD and EMCD, as well as GPSD. BS 136X connectors are used outside the UK; the EU is not relevant to that. John W

Re: [PSES] Safety design of shutter opening

I expect they are quite satisfied by the British approvals. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-07-16 17:48, Scott Xe wrote: Dear Johns, Thanks for advice abt other countries using 13A plugs & sockets!  Do they req

Re: [PSES] Safety design of shutter opening

Well, strictly, an electric shock incident would be a 'two-fault' situation - plug reversed AND conducting object inserted into the live socket. In general, two-fault situations are almost impossible to avoid but luckily also occur very rarely. John Woodgate OOO-Own Opinions Only J

Re: [PSES] Safety design of shutter opening

You have misunderstood. The effect occurs with extension cables, usually fitted with four sockets in a line. It does not occur with wall sockets, even surface-mounted, because the sockets are large enough to prevent it. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates

Re: [PSES] Safety design of shutter opening

. One example I have has only 12 mm, but the socket is not central in the face of the enclosure so the distance on the other side is greater. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-07-17 22:26, Ted Eckert wrote: Would the

Re: [PSES] Safety design of shutter opening

Obviously, but it's a 'two-fault' condition. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-07-18 00:48, Scott Xe wrote: John, Thanks for your advice!  Normally accessibility of live parts is checked by the appl

Re: [PSES] EN 55035/35

If you could set up a reasonable test scheme, you could use EN 55035 for in-situ. Listings in the OJ are held up for legal reasons; the situation is quite complex but has recently been discussed in this forum. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk

Re: [PSES] EN 55035/35

Of course, but any in-situ immunity test would be a very special (and probably very costly) case, for which a dispensation for specific frequencies and/or times of use might be granted. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018

Re: [PSES] EN 55035/35

Yes, there are big rooms that will accommodate large vehicles or some large but movable objects, but not everything is movable. As I said, it would be a very special case, but it it strictly an answer to the question. I certainly agree that there are other possibilities. John Woodgate OOO-Own

Re: [PSES] Product Standards for Aircon Systems

It helps if you say which countries you are interested in. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-07-18 23:22, Vincent Lee wrote: Hi all, Good afternoon, 1) May I know what are some of the common product safety standards for

Re: [PSES] Product Standards for Aircon Systems

me form CEN in Europe and ISO internationally. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-07-19 15:16, Vincent Lee wrote: Hi John Good afternoon, The countries of interest for Aircon Systems are: 1) USA 2) EU 3) South East Asia cou

Re: [PSES] Dips and interruptions when connected to UPS

The manufacturer cannot know that the device will be permanently connected to a UPS unless the device and UPS are sold together as a 'system'.  Only in that case might an exemption be justified, but it would have to be justified and documented in the EMC Assessment of the syst

Re: [PSES] Lithium Ion batteries - capacity measurement

Go to: http://www.iec.ch/dyn/www/f?p=103:22:0FSP_ORG_ID:1410 and look at the standards from IEC SC21 A. You don't give enough data to be sure which standard you want.  Note that by clicking on the standard number you can see an abstract and a preview. John Woodgate OOO-Own Opinions

Re: [PSES] IET BS 7671:2018 vs USA National Electrical Codes (NEC)

John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-07-30 22:33, Vincent Lee wrote: Hi all, Good evening, 1) With the publication of  IET BS 7671:2018, may I know what are the major differences between IET BS 7671:2018 and its 2008

Re: [PSES] SEV Mark Required for Swiss Adapter Plug?

Have you tried asking SEV? John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-08-03 15:44, MIKE wrote: I’m looking for an adapter plug that allows a Schuko plug to be connected to a grounded Swiss receptacle. I have found one that is

Re: [PSES] External toothed star washer used in earth connection

up it is installed. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-08-08 14:21, Scott Xe wrote: Notice that it is common to use external toothed star washer to cut through the paint on metal enclosure instead of removing the paint fo

Re: [PSES] LVD votlage scope query

d' is superfluous. But the 'or' means (like 'either ... or') that BOTH input and output voltages would have to be outside the specified range to be exempt. However, *internal voltages* are not taken into account. John Woodgate OOO-Own Opinions Only J M Woodgate and

Re: [PSES] X & Y Cap rating due to hipot test

What is the safety issue that mandates hi-pot testing anyway? What failure of insulation or clearance/creepage could create a shock hazard? ( I don't think hi-pot has anything to do with fire hazard.) John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Ray

Re: [PSES] X & Y Cap rating due to hipot test

to 2 Mohms, the insulation concerned is deep in failure mode and may not last the week. I have pointed this out in the past, but it didn't have any effect. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-08-14 17:59, Richard Nute

Re: [PSES] X & Y Cap rating due to hipot test

Good luck! John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-08-14 19:37, Ken Javor wrote: Re: [PSES] X & Y Cap rating due to hipot test I know that applying 1 kVdc to caps rated at a lower WVDC level will cause them damage.

Re: [PSES] hipot test

even below 1 megohm in some cases, is included. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-08-15 17:03, Pete Perkins wrote: All, This discussion goes around year after year.    The test results reported – espec

Re: [PSES] hipot test

I think it's not quite like that. Modern insulating materials don't degrade, but old ones did, or at least appeared to. For instance, oiled paper had pinholes, and a discharge caused local carbonization, which prompted more discharges and more carbonization. John Woodgate OOO-Ow

Re: [PSES] hipot test

Yes, it's more or less the same effect. Repeated surface discharges across contaminated thermosetting plastics also caused carbonization, often resulting in a fireworks display when the mains voltage was applied after testing. John Woodgate OOO-Own Opinions Only J M Woodgate and Assoc

Re: [PSES] hipot test

damaging equipment with the hi-pot output and quoting huge fees for repairing. In fact, legitimate repair was often totally uneconomic. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-08-15 20:22, Pete Perkins wrote: John, thanx for yo

Re: [PSES] CB Certificate For Samsung Tablet - Need Contact

I'll pass you request to someone in Samsung UK, but it may not help. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-08-16 13:43, Carl Newton wrote: Group, I'm working with a company that manufacturers exercise equipment. T

Re: [PSES] Machinery standards for Caravan Movers

e fruitful. I did find a certificate (in German) apparently about compliance with road vehicle legalities. Since vehicles are not subject to the MD (I think), that exemption might apply to caravan movers, too. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayle

Re: [PSES] CE marking - mixture of responsibilities

Run, do not walk, away from this manufacturer. Either they are dangerously unaware of the EU requirements, or they are deliberately avoiding commitment. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-08-30 08:48, James Pawson (U3C

Re: [PSES] CE marking - mixture of responsibilities

That's a bit dodgy, Pete. The EU product must be for 230 V mains, so the NRTL won't cover safety test with 230 V 50 Hz input. There may be issues with different EMC standards, as well. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex U

Re: [PSES] CE marking - mixture of responsibilities

Ah! To maximize revenue, no doubt. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-08-30 19:05, Richard Nute wrote: A NRTL tests to ALL the equipment ratings even if they include EU ratings. Rich *From:*John Woodgate *Sent

Re: [PSES] CE marking - mixture of responsibilities

But I can think of a few work-arounds that would invalidate that, with NRTL on the EU product initially, but made in a different factory with no NRTL inspection and less identical later. It's been done. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Ray

Re: [PSES] CE marking - mixture of responsibilities

But you are honest. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-08-30 19:43, Greg McClure wrote: Actually we certify all of our products for both 110-127 V and 220-240 V 50/60 Hz with a NRTL. And we do sell the 220-240 V models

Re: [PSES] RF immunity - audio noise in headsets

It's easy to tell if the 1 kHz is coming from the product; just measure the output voltage at the headphone socket with a well-screened audio voltmeter, with and without the microphone muted. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK

[PSES] How to lose another million dollars

ingenious fools. -- John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message

Re: [PSES] How to lose another million dollars

irst 'good' engineering model (not the first model that 'sort-of' works, that's too early). John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-09-14 17:03, Pete Perkins wrote: James,  Oh yes, I have another re

Re: [PSES] How to lose another million dollars

7;Lingula'  would be more apt (a marine creature that hasn't altered significantly in 500 million years), but not a lot of people know that. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-09-14 18:03, Brian O'Connell wr

Re: [PSES] How to lose another million dollars

I seem to recall that the Challenger disaster was partly caused by escalation either blocked or discounted. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-09-14 18:33, Schmidt, Mark wrote: Ignorance can be achieved at all levels of

Re: [PSES] need some advice on cancellation policy for a seminar

I guess you don't have a cancellation policy in your T&Cs. No doubt you will fix that, as a result of this experience. If you don't want to lose the customer, and maybe get bad music on social media, let them come to a future event at no extra charge. John Woodgate OOO-Own Opi

Re: [PSES] How to lose another million dollars

field. 'On-time, within-budget, compliant' is not an 'any two of three' option. 'Late' and 'more costly' don't kill people, 'non-compliant' can, and does. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh,

Re: [PSES] need some advice on cancellation policy for a seminar

I would regard anyone who pays you as a 'customer'. Replace it with a word you prefer. If they will not take up the 'next event' offer, you have only limited choices, such as the refund and sanction you indicate. Above all, of course, don't let lawyers get involved

Re: [PSES] Equipment EMI Issue

will reciprocate. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-09-26 14:40, Moeller, Robert T. wrote: Hello, Maybe someone can help with this question: We have had one of our systems installed and operating at a customer site in the US

Re: [PSES] Rechargeable li-ion batteries in toys for infants...

I think your interpretation is correct, but you may need to defend it against other opinions. But what happens if he becomes Prime Minister? (;-) John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-09-27 11:59, Matthew Wilson wrote: We are

Re: [PSES] Device with Bluetooth

Maybe clarify that it's CEPT ERC Recommendation 70-03, not ITU or anything else. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-10-02 17:49, Charlie Blackham wrote: Amund Yes it is - whilst EN 300 328 applies to “Wide Band

Re: [PSES] Harmonic current standards

Your question is a bit vague, but the standards are very different in detail. There is no substitute for obtaining the actual standards (from Estonia if cost is an issue) and studying them.  The measuring instrument has to comply with IEC 61000-4-7. It isn't an ordinary power analyser.

Re: [PSES] IEC62368-2

You can find the forecast publication date (June 2019) on the public part of the IEC web site at: https://www.iec.ch/dyn/www/f?p=103:23:0FSP_ORG_ID:1311 John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-10-05 09:44, McBurney, Ian

Re: [PSES] Does incorporated barcode scanner result in a new laser product?

Little guidance, perhaps, because there is little reason to suppose 'no' is a possible answer. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-10-08 16:48, Lauren Crane wrote: I’m not sure this is the correct forum for thi

Re: [PSES] Loop antenna theory

t, because it involves elliptic functions. Curiously, a square or even rectangular loop is mathematically simpler. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-10-12 05:15, Amund Westin wrote: I’m looking for some good and prac

Re: [PSES] Loop antenna theory

Put 50 ohms in series where the cable joins the loop conductor. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-10-13 01:52, Heckrotte, Michael wrote: Also...be careful of the feed cable orientation. The loop impedance doesn’t match

Re: [PSES] NFC (near field communication): FCC Approach?

Sounds similar to an electronic watch (not a smart watch), which is considered EMC-benign in Europe. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-10-19 23:22, MIKE SHERMAN wrote: Esteemed fellow listers -- I'm looking at a

Re: [PSES] CE non-conformity statistics

urers. Test houses and consultants have a dilemma - educate too well and you reduce your future revenue. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-11-01 23:37, Regan Arndt wrote: Hi Pete. Yes, it's a sad state of affairs. Our

Re: [PSES] CE non-conformity statistics

ed in the AHJ system and needs a total change of approach, which is not probable. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-11-02 18:31, Kunde, Brian wrote: Ok, I’ll pile on. I have never been involved in a market surveill

Re: [PSES] CE non-conformity statistics

look like a 'loophole creator', not only to a rabid regulator. The place to assert relevance/irrelevance is in the assessment document, whether for EMC or safety. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-11-02 20:38,

Re: [PSES] CE non-conformity statistics

:2009 + A2:2011 // /// John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-11-02 21:11, John Woodgate wrote: Your first paragraph states the problem, and 'technical violation - no action' is the way it's resolved. In a DoC, I woul

Re: [PSES] Fully anechoic chamber vs. Semi-anechoic chamber

It might well be a great help to CISPR/A if you could collect data on the different results in the two chambers and submit a report. If you don't know how to do that, please ask here. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 20

Re: [PSES] Fully anechoic chamber vs. Semi-anechoic chamber

It would be helpful, especially if it discloses unexpected deviations, but the cable layouts of different EUTs have a significant influence, so might well show different transfer functions.  Data collected from such dual measurements could be helpful to CISPR/A. John Woodgate OOO-Own Opinions

Re: [PSES] NRTL approval

There is a lot that is off-beam, I'm afraid. See my notes below. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-11-13 17:54, Matthew Wilson wrote: Yes an interesting point is that ‘consumer’ use invokes the GPSD and could sta

Re: [PSES] eMail caution

This is a very prevalent scam. It usually says it has evidence that you look at porn sites.  Just ignore it but change your compromised password and any more critical ones, e.g. about banking and credit/debit cards. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates

Re: [PSES] 62368-1 - Resistive PIS Question

ce resistance R (maybe impedance if it's not purely resistive) of whatever is feeding the potential PIS and calculate the available power V^2/(2*R). But the committee might not have meant that. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Ess

Re: [PSES] 62368-1 - Resistive PIS Question

Hello, Rich, I was trying to paraphrase the text in the standard to clarify, not correct, it.  Your proposal changes the time when the power is measured from after 30 s to before 30 s. That's quite a change. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjo

Re: [PSES] Glow wire tests

Hi, Rich. Would you please fix the fifth URL in you list, as we don't have access to your computer ;-) John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-11-21 19:33, Richard Nute wrote: Hi Scott: There are some good You-Tube vide

Re: [PSES] Glow wire tests

Thanks very much, and for your good wishes, which I reciprocate. We have adopted (actually revived) Hallowe'en through American influence but we have not (yet?) adopted Thanksgiving. In any case, consultants don't have holidays. John Woodgate OOO-Own Opinions Only J M Woodgate and

Re: [PSES] Glow wire tests

lendars occasionally start on that day. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-11-21 21:24, Richard Nute wrote: Hi John and all subscribers outside the USA: In the USA, the Holiday Season starts with the fourth Thursday in

Re: [PSES] Testing Standards

That's a huge long list, especially for EMC and RED. It isn't really answerable in a mailing list.  For Europe, you could search the EC lists of notified standards and the CENELEC and ETSI web sites, but it would be a long job. John Woodgate OOO-Own Opinions Only J M Woodgate and

Re: [PSES] ETSI EN 301 428 - VSAT

IRP level when both are expressed in dBW/100 kHz. This means that a narrow-band high-level output is acceptable within 25 MHz of the carrier frequency. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-11-25 18:54, Amund Wes

Re: [PSES] SV: [PSES] ETSI EN 301 428 - VSAT

I'm better at interpreting badly-worded standards than setting out spectrum measurement methods, but I think you are probably correct. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-11-26 06:24, Amund Westin

Re: [PSES] EN 55032

I think it is still held up over legal issues, which may not be resolved any time soon. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-11-26 09:45, McBurney, Ian wrote: Dear colleagues. Does anyone know if the 2015

Re: [PSES] Use of committee draft for product testing

they bother to ask for them, which many do not do). The use of drafts for testing is a decision for the manufacturer. It is particularly relevant now we have the legal issues in Europe that are holding up the publication of many standards, and their notification in the Official Journal. Best wi

Re: [PSES] RES: [Possible SPAM] Re: [PSES] Alternative coupling for Surge Test - Higher current products

Look at hiring? Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-12-05 11:18, Andre Gomes Videira wrote: Dear Sato, Thank you. Yes, the standard suggests a method for currents over 200A. However, we are speaking of a

[PSES] Japanese manis leads

In Japan, are 3-core (L, N, PE) mains leads widely used for single-phase products or are the majority of products safety Class II, with just L and N? -- Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK

Re: [PSES] Japanese manis leads

Thank you. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-12-07 14:04, T.Sato wrote: John, On Fri, 7 Dec 2018 10:54:18 +, John Woodgate wrote: In Japan, are 3-core (L, N, PE) mains leads widely used for single

Re: [PSES] Japanese manis leads

Thank you. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-12-07 14:04, T.Sato wrote: John, On Fri, 7 Dec 2018 10:54:18 +, John Woodgate wrote: In Japan, are 3-core (L, N, PE) mains leads widely used for single

Re: [PSES] California Instruments 848TCM-3-599HZ-1

I don't know, but I know someone who might, so I'll pass your query on. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2018-12-07 14:54, Matthew Wilson wrote: Hello all, would anyone have, or know of a California I

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