[PSES] Who is this fellow?

I see that a certain Mr. Perkins is now an IEEE Fellow.  Well deserved. -- Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK - This message is from the IEEE Product

Re: [PSES] Automated listserv error message

e ISP. For instance, a DNS-lookup failure at the IEEE could cause an 'email address does not exist' failure. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-04-24 16:32, Doug Powell wrote: All, Yesterday I received

Re: [PSES] Auto-Deletion of 558 Subscribers to EMC-PSTC

Are you going to set the trigger for auto-delete to some more reasonable number of email failures, on a 'per month' basis, not 'over all time'? Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-04-24

Re: [PSES] E-Stop Questions

Mushrooms come in all sorts of shape, so the description is not very scientific.  It's only a concern if the AHJ thinks it is! Whether the English is acceptable is a matter for national legislation, so there are probably several incompatible answers. Best wishes John Woodgate OO

Re: [PSES] Fully anechoic chamber FAC

I suspect that the rule applies to chambers of the same useful volume. The FAC needs some special arrangement for the floor, which costs. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-04-24 18:28, Amund Westin wrote: Is

Re: [PSES] Auto-Deletion of 558 Subscribers to EMC-PSTC

ith individual subscribers or their ISPs. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-04-24 18:10, lauren.cr...@us.tel.com wrote: So did I get ‘booted’ because I was out of office a couple times this month? Has restoratio

Re: [PSES] EMC and safety basics (process documentation)

These are very big questions. Your employer should arrange for you to attend appropriate training courses. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK The UK is a sovereign state, not a Zollverein state On 2019-05-09 17:53

Re: [PSES] RoHS 3 question

You normally only cite the latest version. As far as I know, all these references end in /EU now. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK The UK is a sovereign state, not a Zollverein state On 2019-05-09 19:12

Re: [PSES] RoHS 3 question

Commission-delegated Directives, don't have /EU at the end. 2015/863 is an amendment to 2011/65/EU, not a 'new version'. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK The UK is a sovereign state, not a Zollverein st

Re: [PSES] IEC 61000-4-9: Section 7.3 - use of a non-conductive table

the magnetic field because eddy currents would flow. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK The UK is a sovereign state, not a Zollverein state On 2019-05-13 21:36, Richard Georgerian wrote: Greeting colleagues, In IE

Re: [PSES] 62368-1 Openings in a fire enclosure

I would not agree with the test house. If their interpretation was mean, the wording would be different. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK The UK is a sovereign state, not a Zollverein state On 2019-05-17 14:40, Payne

Re: [PSES] 62368-1 Openings in a fire enclosure

rial.  In that case, one can distinguish between the opening and the items that enter/exit through it. But why would anyone put a component half-inside and half outside a fire enclosure? Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh,

Re: [PSES] 62368-1 Openings in a fire enclosure

Noted. The products I deal with can't afford bulkhead connectors. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK The UK is a sovereign state, not a Zollverein state On 2019-05-17 19:33, Nyffenegger, Dave wrote: Bul

Re: [PSES] GB or GC?....that is the question....

ld be obvious. I really do not want a piece of equipment that has a bond conductor almost cut through during the assembly process. Still less than 0.1 ohm, but won't carry 25 A. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK T

Re: [PSES] GB or GC?....that is the question....

Thanks, Richard, for the true facts. However, we can look at the facts another way. Since the test is passed, provided the fault does not get worse, the product remains safe. It's not an ideal situation, but it seems that something like a 100 A test would be required in order to detect a fault

Re: [PSES] GB or GC?....that is the question....

itself, let alone finding a manufacturing error. Eyeball inspection of the grounding circuit probably is sufficient. Best regards, Rich *From:*John Woodgate *Sent:* Wednesday, May 22, 2019 9:44 AM *To:* ri...@ieee.org; EMC-PSTC@LISTSERV.IEEE.ORG *Subject:* Re: [PSES] GB or GC?that is the

Re: [PSES] HP 8753B Vector Network Analyser

Come back John's Radio! May I forward your request to the IEEE EMC/PSTC mailing list? I suppose the module is not in any way repairable by someone who can do surface-mount work? Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex U

Re: [PSES] DC/DC EMI Input Filter Stability

Re solve or prevent. In one way they are the same, because the solution is usually the same. But 'prevent' is far cheaper than 'solve'. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-06-04 17:52, G

Re: [PSES] Stacking Grounds on a Stud

eport. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-06-07 14:09, Brian Kunde wrote: My question(s) is about stacking ground lugs on a single stud for the Protective Earth Terminal inside of a piece of electrical equipment (

Re: [PSES] Does anyone make this filter?

ly transformer that way; admittedly it was 'negotiated' over beer, but resulted in a $100 part for free. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-06-09 18:31, Ken Javor wrote: Re: [PSES] Does anyone make thi

Re: [PSES] Does anyone make this filter?

rines run on batteries. I assumed it was hydrazine. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-06-09 19:48, Ken Javor wrote: Re: [PSES] Does anyone make this filter? I have done exactly that in the past (well, not the beer

Re: [PSES] Tilt test

Clause 8.6 of IEC 62368-1. I don' t know if the UL version differs. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-06-11 21:18, Frank Tang wrote: Hi Engineering community, I'm trying to find information regard ti

Re: [PSES] Grounding

at it doesn't, but it does for some other standard, that doesn't apply to your EUT. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-06-18 19:38, Steve Brody wrote: HI all, I have a client with whom I am havi

[PSES] IEC/EN 61000-3-12

reproduced; there should be a lot more graphics and text. I do not know if this applies also to other versions of the EN. -- Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK

Re: [PSES] Guidelines v Standards v Codes

The use of the word 'code' in that context is not usual in Europe. In British English we have 'codes of practice', which may be mandatory within some professions but can also be 'guidelines' in your context. Best wishes John Woodgate OOO-Own Opinions On

Re: [PSES] Guidelines v Standards v Codes

That's only one sort of standard, a performance standard. There are other sorts, such as 'methods of measurement' standards. In general, a standard is 'an agreement between interested parties'. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates

Re: [PSES] Observation Period during Flicker Emissions Test

;t correct to allow it to run in stand-by during the test. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-06-28 14:24, Brian Kunde wrote: Reference IEC/EN 61000-3-3:2013 section 6.5 regarding Observation Period. The Electr

Re: [PSES] Tilt stability and CoG test lab

Don't forget to put a spot of red paint on it, so you can find it again. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-07-05 18:07, Doug Powell wrote: A quick and dirty way to find the center of gravity is to han

Re: [PSES] Fail analysis on a micro switch - who have this service?

First, if you haven't already, consult the manufacturer. Maybe the contact material is not suitable for the voltage or the current in your application. Microswitches now rarely fail due to contamination. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Assoc

Re: [PSES] Ground on ship

'Ground' only means 'the places which we agree have zero volts on them', nothing more. So wherever that is, on a ship or an aircraft (or inside an appliance with a  2-core power cable), that is 'ground'. Best wishes John Woodgate OOO-Own Opinions On

Re: [PSES] Ground on ship

wristwatch, it's about a square millimetre of PCB foil. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-07-08 20:48, Richard Nute wrote: Hi Peter: Sea water is a very good conductor, better than soil.  Fresh water is an

Re: [PSES] IEC 60601-1-2: 2014 Testing on Device Powered from Computer USB Port

I wouldn't use a generic laptop, just because that could be questioned. Is it not possible to use one of the manufacturer-designated laptops? That can't be reasonably questioned. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Es

Re: [PSES] Railway Earthing and Isolation Requirements - Rolling Stock and Trackside Equipment

Have you looked at IEC TC9 publications? Go to: https://www.iec.ch/dyn/www/f?p=103:22:0FSP_ORG_ID:1248 Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-07-19 09:40, James Pawson (U3C) wrote: Hello experts, I’m working

Re: [PSES] Railway Earthing and Isolation Requirements - Rolling Stock and Trackside Equipment

It replicates, because both are based on IEC TC109 insulation co-ordination standards. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-07-19 13:54, James Pawson (U3C) wrote: Thanks all, I’ve found some voltage isolation

Re: [PSES] Listing confusion

Unfortunately, the DLC logos include the L-word: https://www.designlights.org/terms/logo-guidelines/ Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-07-19 15:43, Doug Powell wrote: All, Well actually, I'm not con

Re: [PSES] UL 61010-1 7.4 stabilty

Is it possible to ask the inspector to give publication and clause references to the claimed provisions? Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-07-23 01:11, Doug Powell wrote: An interesting requirement came up

Re: [PSES] UL 61010-1 7.4 stabilty

I would have thought that a polite request for information would be less likely to damage relations than a challenge to the ruling. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-07-23 06:34, Doug Powell wrote: It may be

Re: [PSES] Electric actuators EMC

For a domestic setting, IEC 61000-3-2, 61000-3-3 apply, together with CISPR 14-1 and CISPR 14-2.  It is possible that there are other standards that might apply, but those should be adequate. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh

Re: [PSES] Product safety leading edge

Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-07-26 22:03, Ted Eckert wrote: In my opinion, increasing environmental compliance requirements are putting the development of new flame retardants at the forefront of s

Re: [PSES] Seeking clean copy of a great EMC Design Tips

I seem to be able to open it OK in PDF Exchange editor.  I could send you two screenshots that are only a little fuzzy if you give me an email address. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-07-29 19:33, IBM Ken

Re: [PSES] Plasma generator

I think the answer to that is 'Not for sure'. It might well be possible for a prosecutor to show that different NBs (if they still exist) offer different advice in such problematic cases. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.u

Re: [PSES] Trusted resources for RoHS/Reach

OJ listings.  I hope this is what you want. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-08-02 21:02, Grasso, Charles wrote: Hello experts, I am (trying!) to put together a list of trusted resources that cover the

Re: [PSES] Conducted emissions AMN/AAN layout

ISPR%2032 There were a lot of proposals for change when the 2012 edition was published. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-08-09 20:17, Andrew Perry wrote: My friends, I am preparing to drill new threaded holes in

Re: [PSES] Conducted emissions AMN/AAN layout

the like might address this issue by devising other ways of attaching the boxes to the ground plane without using holes.  For example, if there is a sheet of steel under the ground plane. magnets on the boxes would work. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates

Re: [PSES] committee member motivations

aren't absolute 'right' answers in editing, only 'wrong 'ones, and if two or more people try to edit the same text you get disputes about equally acceptable wordings. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex

Re: [PSES] committee member motivations

I meant to add that we have to take economic considerations into account as well as engineering and science. No-one would thank us for specifying an EMC test that takes three weeks to carry out. We leave that to the people who specify environmental tests! Best wishes John Woodgate OOO-Own

Re: [PSES] CE Marking and DoC for Multi Device Product

needless complication. However you describe the bits, they have to meet all applicable Directives and Regulations. There is no escape. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-08-12 19:31, Brian Kunde wrote: If I

Re: [PSES] Frequency range for conducted emissions

I don't need to, because Brent DeWitt has answered fully. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-08-12 22:09, John Allen wrote: An “easy one” for us “oldies” but I’m sure that John Woodgate will quickly repl

Re: [PSES] Frequency range for conducted emissions

A small point; the lowest carrier frequency is 153 kHz. Sidebands extend down to 148 kHz. All the European LF and MF broadcasting carrier frequencies are multiples of 9 kHz. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019

Re: [PSES] GTEM cell used for RE measurement

Septum, neuter. Plural septa. Neuter plural always ends in 'a'. Write 100 times. ;-) Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-08-13 07:47, James Pawson (U3C) wrote: Thinking aloud here: would such a factor

Re: [PSES] GTEM cell used for RE measurement

The problem of teaching English grammar is that there are 10 rules and 10 million exceptions. A few lessons on grammar need to be supplemented by many more on 'usage'. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On

Re: [PSES] GTEM cell used for RE measurement

Won't the manufacturer tell you? Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-08-13 15:27, Ken Javor wrote: Re: [PSES] GTEM cell used for RE measurement I understand how the GTEM cell works for immunity. That is

Re: [PSES] User Documents & EU Official Languages, Friday Question

s exactly what that is, few people bother. There is also 'Euro-English', which has a few word-forms that are not used by British English native speakers (e.g.  'within the next days', different meanings of 'respectively' and 'eventually'). Best

Re: [PSES] User Documents & EU Official Languages, Friday Question

7;s just 'what people say'. I actually wrote a document on this subject many years ago, although it was not widely circulated. I have attached it. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-08-23 09:16, Gert

Re: [PSES] User Documents & EU Official Languages, Friday Question

27;creative' is your lawyer? Is that 'black' or 'very dark white'? I think it would be very difficult to get ambiguous language accepted by National Committees, the Chairman and Secretary of the committee and the Central Office editors. Best wishes John Woodgate OOO-

Re: [PSES] User Documents & EU Official Languages, Friday Question

the proactive members who do most of the work. Many other members are not proactive and prefer not to write anything but just agree or disagree. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-08-23 15:04, Gert Gremmen wrote:  

Re: [PSES] User Documents & EU Official Languages, Friday Question

That's the same comma (Polygonia c-album) whose flapping wings caused the hurricane. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-08-23 15:57, Ted Eckert wrote: I’ll note that even the incorrect use of punctuatio

Re: [PSES] Oxford comma

The right approach for legal draftsmen (draftspersons?) is to look for ambiguity, not follow 'rules' about commas. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-08-23 19:34, Richard Nute wrote: The case of t

Re: [PSES] Relaxation of test requirements

I think this is another example of the high standard you set. Please see my responses below. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-08-24 09:29, Gert Gremmen wrote: The discussion on languages and grammar has

Re: [PSES] Relaxation of test requirements

t is not how the rewrite of the EMC immunity criteria is being constrained. It seems to have been ruled that 'manufacturer' cannot be mentioned at all. // Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-08-24

Re: [PSES] Relaxation of test requirements

Hello, Gert. I agree; it's all too easy for issues that have in fact been settled to grow into myths. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-08-24 12:32, Gert Gremmen wrote: John Nice to agree then. :-) Th

Re: [PSES] Relaxation of test requirements

guous conclusions. On 24-8-2019 13:54, John Woodgate wrote: Hello, Gert. I agree; it's all too easy for issues that have in fact been settled to grow into myths. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associateswww.woodjohn.uk Rayleigh, Essex UK On 2019-08-24 12:32, Ge

Re: [PSES] Applicable safety standard ITE equipment used on a factory floor?

60950-1 is on the way out very soon and is replaced by 62368-1, which is VERY different and should certainly be used for all new products. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-09-05 01:22, Joe Randolph wrote

Re: [PSES] Transition period of new or revised standards

ocopocoss rules! Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-09-10 17:15, Scott Xe wrote: I have a query about the transition period in BS EN standard and seeking advice how to correctly interpret the transition period b

Re: [PSES] Transition period of new or revised standards

Since BSI will still be a member of CENELEC and CEN (and ETSI), the European Foreword will still be included. It's a 'standards body' element, not something inserted by the European Commission. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodj

Re: [PSES] Transition period of new or revised standards

more time is required for industry to adapt to the new standard). Docopocoss = Date of cessation of presumption of conformity of superseded standard. This is the only date that actually matters in terms of complying with the associated Directive or Regulation. Best wishes John Woodgate OO

Re: [PSES] Intentional radiator Class A or Class B

To give a reliable answer, we need to know the type of product or the EMC emission standard that applies (e.g. CISPR 14-1/EN 55014-1) and which countries/regions it will be sold in. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK

Re: [PSES] Intentional radiator Class A or Class B

That should be CISPR 35, not CISPR 24 now. In Europe, it would be Class A. The manual should say 'This product is not to be used in a residential environment.'. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-0

Re: [PSES] ISO 12100: 2010(E)

Yes, except where it might be inconsistent with the new standard. Unless the new standard says otherwise. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-09-16 22:00, Douglas Powell wrote: All, It seems the old ISO 12100

Re: [PSES] Intentional radiator Class A or Class B

Blackham. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-09-16 23:55, peterh...@aol.com wrote: John, Are you saying that a product with intentional radiator only needs to meet Class A for emissions in EU? i.e there is no dif

Re: [PSES] Grounding of metal cabinet

an insulating block with metal inserts but a metal block firmly attached to the cabinet. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-09-23 11:33, Amund Westin wrote: A flexible 1-phase AC cable is entering a metal

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

nvironment factor' I refer to the recent report that different results with the same equipment were obtained in an absorptive environment and in a screened room. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-10-15 17:18,

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

x27; If not, the test is either OK or too stringent. The second question is 'Are the results reproducible?', and that's where the problem lies: they are not sufficiently reproducible. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Ray

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

fication to be met under verification test conditions: it *does not* claim to be the waveform that actually occurs during any specific immunity test. It could not possibly claim that. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-10-

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

If the standard, or indeed the underlying technology, really needs to be improved, someone has to spend a dollar or two. I spend the GBP equivalent of about USD2000 a year on standards work I can't charge to clients (because it benefits all, not just one client). YMMV. Best wishes

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

etely substitute for face-to-face. I applaud your pro bono activities. But to do all that and then jib at digging out the papers you cite as the solution to the ESD issues doesn't gel. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Es

Re: [PSES] combined regulatory statements

There is probably nothing in standards about this. You may well be at the mercy of AHJs: some accepting combined wording and some not accepting. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-10-17 19:13, Chester Summers

Re: [PSES] EN 61010-1 accessible Energy Hazard

I recommend covering anything that would cause sparks if shorted. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-10-17 19:05, Richard Nute wrote: Hi Charlie: Is there a clause/requirement in 61010-1 similar to 60950-1

Re: [PSES] Power supply 60335 or 60950...

. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-10-24 11:34, Matthew Wilson | GBE wrote: A client has a product, to be used by consumers typically in a bedroom or child's nursery, which has a microcontroller and is Wi-Fi en

Re: [PSES] Power supply 60335 or 60950...

To answer your final question, 62368-1 is indeed for home use as well as everywhere else. 60335-1 is for 'appliances', which used to be non-electronic, e.g. washing machines, toasters, vacuum cleaners. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.w

Re: [PSES] Terminal block pitch pcb creepage/clearance 400VL:N/G; 600/690 L:L CAT III, PD2, 3Km elevation

If you have room for the 7-position block, go for it to save a lot of argument about other 'solutions'. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-10-26 20:36, Chris Wells wrote: I want to monitor mains of

Re: [PSES] Reading or Limit Conversion?

This inconsistency (in the underlying CISPR standards) should be addressed by CISPR, but it is difficult to get consensus whenever it is discussed. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-10-28 07:05, Charlie

Re: [PSES] Reading or Limit Conversion?

If all the standards were consistent, there would be one standardized process and no possibility of a challenge. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-10-28 20:47, Grasso, Charles wrote: Take the reading. It’s the o

Re: [PSES] Reading or Limit Conversion?

Do you think that this is the post you did not receive? /This inconsistency (in the underlying CISPR standards) should be addressed by CISPR, but it is difficult to get consensus whenever it is discussed. / Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates

Re: [PSES] Reading or Limit Conversion?

2311, but it is not in the new 2019 edition. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-10-29 00:10, Ken Javor wrote: Re: [PSES] Reading or Limit Conversion? Completely off-topic, but... The input impedance of a tuned

Re: [PSES] FCC regulatory statements

Precisely. That's bureaucracy for you. Isn't there also a US law that requires you to listen on a radio for Homeland Security broadcasts? Everyone is guilty of something. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK

Re: [PSES] [EXTERNAL] [PSES] FCC regulatory statements

Agreed, but the real issue is the ambiguity of 'may not'.  It can be interpreted as anything from 'shall not' or 'must not' to 'might not (but might)'. It really should be clarified. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Assoc

Re: [PSES] Fuse in device is mandatory or not?

You only need to look at 2.7.1 in the standard to see what needs to be done. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-11-01 11:39, Matthew Wilson | GBE wrote: If you are considering a fuse you may need to consider

Re: [PSES] Japan PSE Mfg Testing

Probably not ground bond, because most  products used in Japan are Class 2. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-11-01 13:34, Stultz, Mark wrote: Japan’s PSE marking regulations require product testing on the

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

bably will achieve, if you maintain the first one, is nothing, despite all your work. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-11-08 23:08, doug emcesd.com wrote: Hi Monrad and the group, First, Monrad please unblo

[PSES] 80/80 rule

Can someone tell me when the 80/80 rule was introduced into CISPR standards and if possible, a bit more detail than just the date, please? -- Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK

Re: [PSES] 80/80 rule

Thanks for your response, but the rule dates back much further. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-11-18 18:22, Larry K. Stillings wrote: Hi John, There is an IEEE presentation dated 1992, but you may already

Re: [PSES] 80/80 rule

Thanks for your response, but the rule dates back much further. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-11-18 18:11, Wiseman, Joshua wrote: John, I first came across it in Annex H of CIPSR 11: 2015.  The

Re: [PSES] 80/80 rule

I agree: I'm almost certain that it is German in origin, and I'm sure it dates back to the 20th Century, possibly as early as 1960. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-11-18 19:44, John Shinn wrote: If

Re: [PSES] 80/80 rule

That's the 80/20 rule, which is an entirely different thing. It applies to standards committees; 20 % of members do all the work and 80 % just accept the results. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-11-18

Re: [PSES] 80/80 rule

instant of assessment by a surveillance authority. So the **surveillance authority** should make allowance for these variations, by applying the 80/80 rule, or some other algorithm that can be justified. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk

Re: [PSES] 80/80 rule

Thanks, that's a very important lead. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-11-19 08:09, Ari Honkala wrote: I found an interesting old document “CISPR Report of the Plenary Session held in The Hague from

Re: [PSES] UL508A vs UL61010-1 for control and monitoring equipment

temperature or rate of rotation, to other things. If your panel does that, 61010-1 applies. Best wishes and seasonal felicitations John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2019-12-13 08:50, Rodriguez, Daniel (ESP) wrote: Good morn

Re: [PSES] act of God versus safety

Hi, Rich. If the standard is, *with hindsight*, 'perfect' in relevant matters, then the injury is an AoG. But, as of course you know, probably no standard passes that test for all 'relevant matters'. Best wishes With seasonal felicitations John Woodgate OOO-Own Opinions Onl

Re: [PSES] act of God versus safety

Does that prove that at least one god exists? Best wishes With seasonal felicitations John Woodgate OOO-Own Opinions Only Rayleigh, Essex UK www.woodjohn.uk On 2019-12-30 02:09, Scott wrote: If you do a thorough hazard analysis, an act of god is obvious! Scott Sent from my iPhone On Dec 29

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