Re: [PSES] [EXTERNAL] Re: [PSES] What percentage of products pass first time?

2021-06-04 Thread John Woodgate
Everyone has a choice. == Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk Rayleigh, Essex UK Istae nunc praetereunt nisi non ubicumque On 2021-06-04 20:40, john_e_al...@blueyonder.co.uk wrote

Re: [PSES] [EXTERNAL] Re: [PSES] What percentage of products pass first time?

2021-06-04 Thread John Woodgate
Don't assume. I've just been hired at 83.5 years old. Not a long-term hire, nor well paid, but every little helps. == Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk Rayleigh, Essex UK Istae nunc

Re: [PSES] Australia: IEC 62368-1 or IEC 61010-1 for controller with radio

2021-05-25 Thread John Woodgate
wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk Rayleigh, Essex UK Istae nunc praetereunt nisi non ubicumque On 2021-05-25 12:57, Rodriguez, Daniel (ESP) wrote: Thank you all The summary is that as AS/NZS 62368-1 is a standard defined by ACMA for radio equipment, we will test

[PSES] ENs notified in the OJEC are legal documents

2021-04-15 Thread John Woodgate
Does anyone have the exact wording of the European Court decision given in the Subject line above? -- == Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk Rayleigh, Essex UK Et ita istae

Re: [PSES] Energy efficiency for power supplies...

2021-01-21 Thread John Woodgate
The requirements were negotiated between EC-hired consultants and industry stakeholders. Or so I was assured. == Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk Rayleigh, Essex UK "A n

[PSES] EMC for induction cookers

2020-07-16 Thread John Woodgate
Is anyone involved with induction cookers willing to discuss EMC in the context of CISPR14-1? On-list or off-list. -- Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk Rayleigh, Essex UK MAY THE VIRUS NOT BE WITH YOU dum nisi ex silvis sumus -- This email has been checked

Re: [PSES] Small loop antenna

2020-07-13 Thread John Woodgate
Thank you very much. Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk Rayleigh, Essex UK MAY THE VIRUS NOT BE WITH YOU dum nisi ex silvis sumus On 2020-07-13 15:03, Larry K. Stillings wrote: John, ETS Lindgren has some smaller loop antennas in their product line. http

[PSES] Small loop antenna

2020-07-11 Thread John Woodgate
Does anyone know of a commercially-available small loop antenna (4.3.2 of CISPR 16-1-4) that isn't a 60 cm diameter circle? -- Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk Rayleigh, Essex UK MAY THE VIRUS NOT BE WITH YOU dum nisi ex silvis sumus -- This email has been

[PSES] IEEE 291

2020-07-09 Thread John Woodgate
Two questions: 1. Can an IEEE member get to see IEEE 291, even if it's only 'read only', free of charge? 2. Is its contents superseded by part of IEEE C63.4-2014? -- Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk Rayleigh, Essex UK MAY THE VIRUS NOT BE WITH YOU dum nisi ex

Re: [PSES] Can the previous version of a Normative Reference be used if newest version is too new?

2020-06-01 Thread John Woodgate
affect your use of the part. Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk Rayleigh, Essex UK MAY THE VIRUS NOT BE WITH YOU dum nisi ex silvis sumus On 2020-06-01 16:40, Kevin McCandless wrote: Hello Colleagues, We have a handheld device that is being tested for IEC 62368-1:2014

Re: [PSES] marking of rated voltages

2020-05-22 Thread John Woodgate
. The revision was produced by IEC committee TC3. TC3 documents are studied by national committees that often have very little or no liaison with their own product committees. I wonder if TC3 consulted any product safety committees. Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk

Re: [PSES] New RoHS Directive list Harmonised Standard

2020-05-22 Thread John Woodgate
Short notice of withdrawal - only about 18 months. Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk Rayleigh, Essex UK MAY THE VIRUS NOT BE WITH YOU dum nisi ex silvis sumus On 2020-05-22 14:44, Charlie Blackham wrote: Commission Implementing Decision (EU) 2020/659 <ht

Re: [PSES] CU TR 020/2011 (Russia+) Non-Residential EMC Exemption?

2020-05-20 Thread John Woodgate
It looks very much to me that 'consumer' is a synonym of 'user' in general, not restricted to 'home user'. Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk Rayleigh, Essex UK MAY THE VIRUS NOT BE WITH YOU dum nisi ex silvis sumus On 2020-05-20 12:36, Carl Newton wrote: I've

Re: [PSES] Acceptor & Rejector Circuits

2020-05-20 Thread John Woodgate
elsewhere. For example, another ancient textbook (I can't remember the title) describes an air-cored inductor of 1 henry with a resistance of 1 ohm. Easily simulated in Spice, but requires a small building to house it in real life. Best wishes John Woodgate OOO-Own Opinions Only

Re: [PSES] 62368-1 Section 6.4.8 Flammability Confusion

2020-05-06 Thread John Woodgate
Can you please share the format of your 'document and worded' exercise? I might be able to get at lease a small part of IEC interested in it. Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk Rayleigh, Essex UK MAY THE VIRUS NOT BE WITH YOU On 2020-05-06 20:40, John E Allen

Re: [PSES] 62368-1 Section 6.4.8 Flammability Confusion

2020-05-06 Thread John Woodgate
This is the sort of thing that can easily happen in a huge document. It is extremely difficult, especially where there is a chain of forward and back cross references, and text pushed off from its primary context to multiple annexes, to ensure internal consistency. Best wishes John Woodgate

Re: [PSES] ESD - Floating metal knob, otherwise grounded equipment

2020-03-12 Thread John Woodgate
of the insulation with a much higher energy. Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk Rayleigh, Essex UK On 2020-03-12 15:53, Elliott Martinson wrote: Hi Everybody, We’re having some disagreements regarding the 61000-4-2 standard. In the section “ungrounded equipment

Re: [PSES] Keeping cellphone noise out of audio op-amps

2020-02-19 Thread John Woodgate
Thank you very much. Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk Rayleigh, Essex UK On 2020-02-19 12:20, Gert Gremmen wrote: Basically any connection to an opamp can create unwanted susceptibility. So a small cap to ground preceded by a suitable impedance

[PSES] Keeping cellphone noise out of audio op-amps

2020-02-19 Thread John Woodgate
I see two apparent ways of keeping cellphone noise out of audio op-amps: - 10 pF between + and - inputs; - 47 pF (or similar) from output to inverting input. Which is usually more effective? I suspect that the first one is, but I see it less often. -- Best wishes John Woodgate OOO-Own

[PSES] Test please ignore

2020-02-16 Thread John Woodgate
Please ignore - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to All emc-pstc postings are archived and searchable on the web at:

[PSES] Keeping cellphone noise out of audio op-maps

2020-02-16 Thread John Woodgate
I see two apparent ways of keeping cellphone noise out of audio op-amps: - 10 pF between + and - inputs; - 47 pF (or similar) from output to inverting input. Which is usually more effective? I suspect that the first one is, but I see it less often. -

Re: [PSES] Post Brexit Day Jan 31 2020, where is UK going with CE mark?

2020-02-13 Thread John Woodgate
No change likely until January 2021, and probably not then. It probably wouldn't be in UK interest to be unnecessarily difficult about EU requirements. On 2020-02-13 21:22, Rick Linford wrote: Not seeing update for several months, now post Brexit; Does anyone have insight how long the CE

Re: [PSES] PCB layout technique - multilayer

2020-02-10 Thread John Woodgate
Look for books and other publications by Keith Armstrong, and others by Tim Williams. On 2020-02-10 07:27, Amund Westin wrote: I’m looking for articles about how to do good EMC layout on multilayer PCB. Choice of PCB layer stacking (8 or 10 layers) and basic routing techniques are the

Re: [PSES] NATO Standards

2020-02-05 Thread John Woodgate
The indication is that you have to apply to the German Defence Ministry as the 'National Authority'. If they do not give you direct access, they may tell you who  is the 'Supplier'. On 2020-02-05 12:19, loerzer_mob...@globalnorm.de wrote: Hello, does anybody a source or website where I can

Re: [PSES] 62368-1 fire enclosure

2020-02-04 Thread John Woodgate
There are a lot of exemptions later in 6.4.4, the most significant perhaps being: /These requirements do not apply to: – parts with a size of less than 1 750 mm3; / But you really need to study the standard yourself, to see the other exemptions. On 2020-02-04 13:55, McBurney, Ian wrote:

Re: [PSES] Construction Site Power Cords, Germany

2020-01-28 Thread John Woodgate
You would probably have to ask for the meaning of  the original vague German phrase, because much may be obscured in translation. On 2020-01-29 02:04, MIKE SHERMAN wrote: A German insurance document, DGUV Information 203-006 ( Selection and operation of electrical systems and equipment on

Re: [PSES] Cable question, or 'foiled' again

2020-01-21 Thread John Woodgate
Something is very odd. If the cable is rated for 300 V (DC), it shouldn't fail at 250 V AC (354 V peak).  Presumably those 'other cables' did pass the 250 V test. There seems to be some confusion, too, about the role of the connector shell. It is surely just an 'accessible conducting part',

Re: [PSES] CODEBOOK DOWNLOAD

2020-01-16 Thread John Woodgate
opying, in whole or part, of this message is strictly prohibited.  If you believe that you have been sent this message in error, please do not read it.  Please immediately reply to sender that you have received this message in error.  Then permanently delete all copies of the message. Thank yo

Re: [PSES] CODEBOOK DOWNLOAD

2020-01-16 Thread John Woodgate
You can find far more attractive prices for the EN versions of IEC standards at https://www.evs.ee/shop On 2020-01-16 19:50, John Allen wrote: Hi, We’re finding Standards very inexpensive on the subject website.  Haven’t downloaded any yet.  The site seems legit but selling IEC 62368-1

Re: [PSES] Conformity Assessment Procedure

2020-01-15 Thread John Woodgate
I think you are vulnerable using the procedure you describe. I think the expectation of the Directive is that a test house receives a complete product from the manufacturer and test it 'as is'. The test house should not assemble parts (such as a selection of plug-in modules) to an incomplete

Re: [PSES] Touch current in IEC 60335-1 for Household Appliances

2020-01-15 Thread John Woodgate
*From:* John Woodgate [mailto:j...@woodjohn.uk] *Sent:* Wednesday, January 15, 2020 2:57 PM *To:* EMC-PSTC@LISTSERV.IEEE.ORG *Subject:* Re: [PSES] Touch current in IEC 60335-1 for Household Appliances Double insulation applies only to one pole of the supply, except the mains supply, where both

Re: [PSES] Touch current in IEC 60335-1 for Household Appliances

2020-01-15 Thread John Woodgate
(USA) j...@randolph-telecom.com <mailto:j...@randolph-telecom.com> http://www.randolph-telecom.com <http://www.randolph-telecom.com/> *From:* John Woodgate [mailto:j...@woodjohn.uk] *Sent:* Friday, January 10, 2020 11:43 AM *To:* Joe Randolph <mailto:j...@randolph-telecom.com>> *

Re: [PSES] Touch current in IEC 60335-1 for Household Appliances

2020-01-15 Thread John Woodgate
Telecom, Inc. 781-721-2848 (USA) j...@randolph-telecom.com <mailto:j...@randolph-telecom.com> http://www.randolph-telecom.com *From:* John Woodgate [mailto:j...@woodjohn.uk] *Sent:* Tuesday, January 14, 2020 1:27 PM *To:* Joe Randolph *Subject:* Re: [PSES] Touch current in IEC 60335-1 for Hou

Re: [PSES] [EXTERNAL] Re: [PSES] act of God versus safety

2019-12-30 Thread John Woodgate
The hazard-based approach is valid and very important, but it does not interact well with the 'AoG' concept, since that denies that a current hazard (such as a very near future volcanic eruption) is/has been identified. Best wishes With seasonal felicitations John Woodgate OOO-Own Opinions

Re: [PSES] [EXTERNAL] Re: [PSES] act of God versus safety

2019-12-30 Thread John Woodgate
Thank you very much. Best wishes With seasonal felicitations John Woodgate OOO-Own Opinions Only Rayleigh, Essex UK www.woodjohn.uk On 2019-12-30 21:23, John Allen wrote: John W & Friends Earlier this afternoon, we were visiting a friend of my wife and her partner – and, later du

Re: [PSES] [EXTERNAL] Re: [PSES] act of God versus safety

2019-12-30 Thread John Woodgate
Thank you. I try to tackle things like this for my work on standards writing. Best wishes With seasonal felicitations John Woodgate OOO-Own Opinions Only Rayleigh, Essex UK www.woodjohn.uk On 2019-12-30 20:42, Doug Nix wrote: I completely agree John. Your revised definition is on the money

Re: [PSES] [EXTERNAL] Re: [PSES] act of God versus safety

2019-12-30 Thread John Woodgate
adopted values of 'infinitesimal probability'. This allows for a black swan that can play the piano. Best wishes With seasonal felicitations John Woodgate OOO-Own Opinions Only Rayleigh, Essex UK www.woodjohn.uk On 2019-12-30 20:39, Douglas Nix wrote: Two thoughts on this: 1) it sounds from

Re: [PSES] [EXTERNAL] Re: [PSES] act of God versus safety

2019-12-30 Thread John Woodgate
should be clear that this is just an attempt at humor and has little effect on liability in product design. The opinions expressed are my own and do not necessarily reflect those of my employer. *From:* John Woodgate mailto:j...@woodjohn.uk>> *Sent:* Sunday, December 29, 2019 6:41 PM *T

Re: [PSES] [EXTERNAL] Re: [PSES] act of God versus safety

2019-12-30 Thread John Woodgate
With seasonal felicitations John Woodgate OOO-Own Opinions Only Rayleigh, Essex UK www.woodjohn.uk On 2019-12-30 16:11, Ted Eckert wrote: First, I am not licensed to practice law in any jurisdiction. Take what I say as the view of an engineers with only limited experience in this area. The term “Act

Re: [PSES] act of God versus safety

2019-12-29 Thread John Woodgate
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

Re: [PSES] act of God versus safety

2019-12-29 Thread John Woodgate
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 Only Rayleigh, Essex UK

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

2019-12-13 Thread John Woodgate
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 morning    all I have

Re: [PSES] 80/80 rule

2019-11-19 Thread John Woodgate
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 18^th

Re: [PSES] 80/80 rule

2019-11-18 Thread John Woodgate
to the 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

2019-11-18 Thread John Woodgate
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 20:02

Re: [PSES] 80/80 rule

2019-11-18 Thread John Woodgate
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 my memory

Re: [PSES] 80/80 rule

2019-11-18 Thread John Woodgate
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

Re: [PSES] 80/80 rule

2019-11-18 Thread John Woodgate
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

[PSES] 80/80 rule

2019-11-18 Thread John Woodgate
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] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

2019-11-08 Thread John Woodgate
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 unblock my

Re: [PSES] Japan PSE Mfg Testing

2019-11-01 Thread John Woodgate
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

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

2019-11-01 Thread John Woodgate
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] [EXTERNAL] [PSES] FCC regulatory statements

2019-11-01 Thread John Woodgate
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 Associates www.woodjohn.uk Rayleigh, Essex UK

Re: [PSES] FCC regulatory statements

2019-10-31 Thread John Woodgate
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 On 2019-10

Re: [PSES] Reading or Limit Conversion?

2019-10-29 Thread John Woodgate
, 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 dipole is 72 Ω

Re: [PSES] Reading or Limit Conversion?

2019-10-29 Thread John Woodgate
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?

2019-10-28 Thread John Woodgate
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 only way

Re: [PSES] Reading or Limit Conversion?

2019-10-28 Thread John Woodgate
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] Terminal block pitch pcb creepage/clearance 400VL:N/G; 600/690 L:L CAT III, PD2, 3Km elevation

2019-10-26 Thread John Woodgate
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 polyphase

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

2019-10-25 Thread John Woodgate
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.woodjohn.uk

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

2019-10-24 Thread John Woodgate
. 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 enabled

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

2019-10-17 Thread John Woodgate
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] combined regulatory statements

2019-10-17 Thread John Woodgate
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] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

2019-10-15 Thread John Woodgate
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, Essex UK

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

2019-10-15 Thread John Woodgate
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 John

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

2019-10-15 Thread John Woodgate
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 2019-10-15 20:06, doug emcesd.com

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

2019-10-15 Thread John Woodgate
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 Rayleigh, Essex UK On 2019-10-15 19:51, DEREK WALTON wrote: Hi All, Well, this seems like here we go

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

2019-10-15 Thread John Woodgate
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, doug emcesd.com

Re: [PSES] Grounding of metal cabinet

2019-09-23 Thread John Woodgate
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 cabinet

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

2019-09-17 Thread John Woodgate
. 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 difference

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

2019-09-16 Thread John Woodgate
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

2019-09-16 Thread John Woodgate
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 2019-09-16 17:56

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

2019-09-16 Thread John Woodgate
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] Transition period of new or revised standards

2019-09-12 Thread John Woodgate
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 OOO-Own

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

2019-09-11 Thread John Woodgate
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.woodjohn.uk Rayleigh

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

2019-09-10 Thread John Woodgate
! 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 based on the EU

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

2019-09-05 Thread John Woodgate
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] Relaxation of test requirements

2019-08-24 Thread John Woodgate
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. :-) The new

Re: [PSES] Relaxation of test requirements

2019-08-24 Thread John Woodgate
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 11:51, Gert Gremmen wrote: These

Re: [PSES] Relaxation of test requirements

2019-08-24 Thread John Woodgate
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] Oxford comma

2019-08-23 Thread John Woodgate
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 the missing

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

2019-08-23 Thread John Woodgate
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 punctuation can

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

2019-08-23 Thread John Woodgate
. 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:  > I think it would be very difficult to get ambiguous language accepted by National Committees, the Chairman and Secretary of the commit

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

2019-08-23 Thread John Woodgate
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-Own Opinions Only J M Woodgate and Associates

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

2019-08-23 Thread John Woodgate
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 Gremmen wrote: Hi John (et al), I noticed with quite interest your statement on the Euro-English; do you think

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

2019-08-23 Thread John Woodgate
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 wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates

Re: [PSES] GTEM cell used for RE measurement

2019-08-13 Thread John Woodgate
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 quite

Re: [PSES] GTEM cell used for RE measurement

2019-08-13 Thread John Woodgate
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 2019-08-13

Re: [PSES] GTEM cell used for RE measurement

2019-08-13 Thread John Woodgate
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 exist

Re: [PSES] Frequency range for conducted emissions

2019-08-12 Thread John Woodgate
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] Frequency range for conducted emissions

2019-08-12 Thread John Woodgate
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 reply

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

2019-08-12 Thread John Woodgate
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 have an electronic product that I want to place on the market

Re: [PSES] committee member motivations

2019-08-10 Thread John Woodgate
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] committee member motivations

2019-08-10 Thread John Woodgate
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 UK On 2019-08-10 20:44, Richard Nute wrote: Regarding

Re: [PSES] Conducted emissions AMN/AAN layout

2019-08-10 Thread John Woodgate
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 www.woodjohn.uk

Re: [PSES] Conducted emissions AMN/AAN layout

2019-08-09 Thread John Woodgate
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 our chamber floor, where we

Re: [PSES] Trusted resources for RoHS/Reach

2019-08-02 Thread John Woodgate
the 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

Re: [PSES] Plasma generator

2019-08-02 Thread John Woodgate
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.uk Rayleigh

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

2019-07-29 Thread John Woodgate
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] Product safety leading edge

2019-07-27 Thread John Woodgate
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 safety

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