Re: Exemption from CE for products intended for military or police purposes

that government surplus equipment falling into the hands of civilians would cause problems, so much equipment was partially damaged before sale. This, of course, simply acted as a challenge. Later, common sense prevailed, and there was no rush of accidents or illegal transmission. -- Regards, John Woodgate

Re: Russian (GOST) equivalent standards.

afraid you are wrong in respect of dimmers, as you would know if you had read clause G.2.2.4 of EN 55103-1. The OP's 'dimmer/control equipment' suggested to me that the control was integrated in the dimmer rack, in which case EN 55015 applies to the whole box. -- Regards, John Woodgate, OOO - Own

Re: CISPR 22 Ed. 4.0 Published April 10 2003

into force in Europe for around three years, I would wait and see what happens. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me

Re: Russian (GOST) equivalent standards.

61010-1 and EN 60950 to cover the safety requirements.  You should be using EN 55015 for emissions and you do not need to apply EN 61010-1 for safety. I advise you to sort that out before you approach Russia, because they will know. -- Regards, John Woodgate, OOO - Own Opinions Only. http

Re: EN61326 and deviations

of details? Maybe a graph. Would this include the DoC? Not in the DoC. Could I say we meet Criteria A, but in a few frequencies we meet criteria B, call for more details. I don't think that's enough; you should provide the details up-front. -- Regards, John Woodgate, OOO - Own Opinions Only. http

Re: Medical grade PSU and Grounding techniques

. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical

Re: CISPR 22 Ed. 4.0 Vote Results

, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc

Re: G5-4 Harmonics Emissions Limits for Industrial Apparatus.

://www.electricity.org.uk You can sign on to the catalogue pages as 'guest', with password 'guest', but you can't download; you have to pay first. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go

Re: Stripline design

am keen to construct one from aluminium sheet. There is a set of drawings in CISPR 20/EN 55020 but there are some fairly obvious mistakes in them concerning the details. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound

Re: Harmonics and conducted emissions

for the planned full revision of 61000-3-2. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from

Re: Harmonics and conducted emissions

receiver! This overloading has been around for a very long time. It is one of the disadvantages of using a spectrum analyser instead of a CISPR receiver. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution

Re: VG95373 - advice needed

Price -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety

Re: Bad Fuse vs. Good Fuse

I read in !emc-pstc that richhug...@aol.com wrote (in 095A00F3.5FF82361 .0ba45...@aol.com) about 'Bad Fuse vs. Good Fuse' on Mon, 26 May 2003: It could be that the faulty components that John Woodgate mentioned fall into this category. The epidemic failures were undoubtedly due to manufacturing

Re: Bad Fuse vs. Good Fuse

, and let go a few days after purchase. The failure modes were open-circuit for no external reason and high resistance. Occasionally, we would get one that produced cracking on sound, indicating a poor internal connection. -- Regards, John Woodgate, OOO - Own Opinions Only. http

Re: Use of Voltage Probe

and technically correct to pay attention to where you ground the voltmeter connected to the probe, wherever the measurements are carried out. It would be logical to connect it to the enclosure of the EUT, if it is metal, with the shortest practicable lead. -- Regards, John Woodgate, OOO - Own Opinions

Re: AC shut-down

system can overheat and self-destruct. It sounds like 'military intelligence' to me. (;-) -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts

Re: Safety testing after equipment repair

to be more representative than your first description suggested. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL

Re: harmonics testing

are required. If they are marketed as separate items, each requires a DOC and a CE mark, and they are tested separately. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk

Re: harmonics testing

a rack of physically-separable items which are not marketed individually, then that is a 'system' as defined in the Directive and the Guidelines and is tested and CE-marked as a whole. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound

Re: Safety testing after equipment repair

in the PEC path, and stranded PEC and bond wires that have only one or two strands still intact. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts

Re: Safety testing after equipment repair

procedures. In your experiment, there was only one increase of voltage, whereas in repeated testing, there are many. At best, we don't know if that matters or not. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement

Re: harmonics testing

, and purchasers can choose which items to buy, then there is no one kit that the manufacturer can test; instead each item is tested separately. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go

Re: Safety testing after equipment repair

. Earth leakage is often appropriate but it is necessary to distinguish between resistive leakage and capacitive current. I don't know of any snags with touch current testing IF the IEC 60999 meter is used. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested

Re: Safety testing after equipment repair

is to say that a hi-pot test is required if a visual inspection by a supervisor indicates that it is necessary. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do

Re: ENV 50204

July 2004. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety

Re: ENV 50204

standard then that standard takes precedence over the generic standard? Yes. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E

Re: RTTE DoC languages

if they are not sufficiently competent in the language. I recommend that you ask the professional translators on sci.lang.translation because there are legal implications if a translation is defective. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound

Re: ATEX Directive

be appreciated. I think you need to try to explain more clearly what you are really asking. For example, what products do you have in mind, and I suspect you are writing 'CENELEC' when you really mean specific CENELEC standards. If so, which ones? -- Regards, John Woodgate, OOO - Own Opinions Only

Re: Standards applicable for Speaker

speaker (say in PC show)? No. There is an IEC Guide on this subject, but it isn't worth getting a copy. This subject has been raised thousands of times over the last few years and no-one has ever reported any problem with the regulatory authorities, AFAIK. -- Regards, John Woodgate, OOO - Own

Re: Heat Sink Colour.

of perspiration. Dark skin radiates better, hence the dark coloring of people with African ancestry. The dark skin is more for protection against UV. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution

Re: Standards applicable for Speaker

circuitry to classify as ITE.. But we do allow users to connect the speaker as multimedia speaker, i.e. connected to PC. Like to hear your view of this dilemma that we're in. EN 55013/55020 apply. Such products are 'household and similar electronic equipment'. -- Regards, John Woodgate, OOO - Own

Re: NEW EMC DIRECTIVE

with it'. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical

Re: Field trial requirements

be able to use the provisions for 'one-offs' in the new Directive. But this is a matter which has already been raised as an objection to the current draft, AIUI. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement

Re: Acoustic Noise Level

if it's more than 10 dB below the total noise level. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message

Re: NEW EMC DIRECTIVE

. A special cable, made for a particular site, comes under the new provisions for 'one-offs' (a term not used in the Directive, of course). I'm sure there are valuable prizes offered within the Commission, for 'the most obscure text of the month'. (;-) -- Regards, John Woodgate, OOO - Own Opinions Only. http

Re: ESD gun verification

product that has a more technically-defensible arrangement. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message

Re: ESD gun verification

buying something off the shelf (if I could find said shelf). I'm not sure that you can even do that at a sensible cost, but I understand that there are a few specialist companies who will verify your gun for you. I don't have any names or URLs, though. -- Regards, John Woodgate, OOO - Own Opinions

Re: ESD failure

, after all. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety

Re: D of C again

, the manual is approved and goes to print before the final testing of the product and certainly before the DOC is signed. Is that a new law of nature? It seems that the system is running you, rather than the other way round. -- Regards, John Woodgate, OOO - Own Opinions Only. http

Re: ESD gun verification

the previous version of the calibrator found a need for a 6 GHz scope among other exotica. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me

Re: D of C again

have to run in parallel. I would not be daft enough to suggest a procedure that added even a week to time-to-market. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk

Re: D of C again

it's scope.) Well, sort of. In fact, for most equipment, the manufacturer can choose whether to apply the RTTE Directive OR the LVD and EMC. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go

Re: D of C again

would be interesting to note. How about the idea of putting an online link to where the DOC could be found. Do you think that would meet the RTTE requirement of D of c with product. About 2 years ago, I heard that some countries will NOT accept this solution. -- Regards, John Woodgate, OOO - Own

Re: Do you realize how annoying it is?

. For example the OOF replies?..they are automatically routed to my Deleted Items. Not too much of a hassle.. ... unless you inadvertently set your mailer to **reject** them, in which case you may set up an endless loop, and your ISP will kill you. -- Regards, John Woodgate, OOO - Own Opinions Only

Re: The transformer screen/shield conundrum

values are in various countries, for equipment connected to wall-sockets? Assuming that the mains lead has the resistance that can be deduced from the maximum permissible resistance of its PEC. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional

Re: The transformer screen/shield conundrum

with that, but it's bothersome. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society

Re: The transformer screen/shield conundrum

, the trade secret is to use two layers of foil. Only the first one gets the hole. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me

Re: CE without LVD?

normal operating conditions! You could have arranged to have one burn up in their CEO's office to prove your point! -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk

Re: Czech medical grounding?

standpoint. I don't know about regulatory issues, but the equipment could accumulate a static charge, unless earthed (or bonded, anyway, to everything else in the area) and zap a patient in a sensitive spot. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested

Re: CE without LVD?

conformity to EN 60950. There is also a need to put the CE mark on the product, for the EMC Directive. The comments about the GPSD are correct, but they don't actually indicate what the manufacturer needs to do physically in order to comply with all the rules. -- Regards, John Woodgate, OOO - Own

Re: Dielectric withstand voltage for power supplies

it comes to safety I'll check it out for myself. That's precisely my advice. [snip most of my quoted message] But don't take my word for it! There you are! -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement

Re: Dielectric withstand voltage for power supplies

so that you can read, and indeed learn, its provisions. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message

Re: Dielectric withstand voltage for power supplies

A or so. But don't take my word for it! -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE

Re: Fuel cell product and EMC

about fuel cells that would justify a product-family standard? -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL

Re: ESD - not applicable ?

that says a product higher than x meters off of the floor is not accessible. IEC 60364-41, clause 2.5, I think. It specifically mentions 2.5 m. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go

Re: ESD - not applicable ?

? -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical Committee

Re: ESD - not applicable ?

-trained monkeys, like most installations. (;-) -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from

Re: another OATS question

people that's the Holy Grail. For them, the purpose of testing is to fail products, not to pass them. While their influence has declined in recent years, there are still traces of their earlier achievements. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested

Re: (mis)spelling humor

wide memo that changed a name from Hugh Hagel to Huge Bagel.    Gary I won't tell you what Word97 spelling checker suggests for the initials of my firm - JMWA. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound

Re: Transverse Balance Limitations 68.310_On Hook

, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical Committee emc

Re: New EU Member States

, or something very like them, in their national legislation. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL

Re: Transverse Balance Limitations 68.310_On Hook

balance is presumably determined by measurements that effectively (or indirectly) compare the impedances from each leg to ground. If there are spurious emission voltages on the legs, and the measurement equipment responds to them, this must make the impedance determinations inaccurate. -- Regards, John

Re: IEC 60664-4 concerns

. I am interested in characterizing a number of material types and factor in frequencies up to 300 MHz and higher. You may well need to get some original applied research done on your specific project. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk

Re: Argicultural machines

CISPR 25/EN 55025(?) will apply to agricultural machines, or perhaps only some. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me

Re: CENELEC Harmonisation Documents

as the reasons for national deviations to the base standards. These regulations were often more clearly called out than in the superceeding EN's. It wasn't the reason that you wanted the information that wasn't clear, it was precisely what you wanted. Has Rich Nute steered you to it? -- Regards, John Woodgate

Re: CENELEC Harmonisation Documents

with amendments was adopted as EN 60065. The situation with IEC/EN 60335 is immensely complex, since the Parts and Sections were re-numbered 'on the fly' some years ago, with considerable confusion for those not involved in the committee work. -- Regards, John Woodgate, OOO - Own Opinions Only

Re: The Universal Plug Adapter!???

the product, akin to one or more levels of protection?!? Yes. of course. It's very powerful juju. (;-) -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy

Re: The Universal Plug Adapter!???

marking. I think you understand it very well. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from

Re: Surge Suppressors on a UPS

and inexplicable. I see the leaden hand of the corporate attorney there. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL

Re: Number of Terminations on a Ground Stud?

, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical Committee emc

Re: Carton box dimension and gross weight to EU

(such as those containing TV sets). -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC

Re: Q on Correlation of Votage ripple with a Spectrum Analyser

you unhappy? Maybe we can tell you where it came from. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message

Re: Q on Correlation of Votage ripple with a Spectrum Analyser

a sawtooth, but the short rising branch is a small section of the crest of a sine wave. If the ripple voltage is very small compared with the d.c. voltage and the ESR of the filter capacitor is very low, the spectrum of the ripple is often quite close to that of a sawtooth. -- Regards, John Woodgate

Re: pulse modulation in reverb chambers

microsecond could be quite a bit short. Obviously it depends on the size of the chamber. If there is a paddle, it might be necessary to allow several turns of it to establish a cyclically stable field pattern. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk

Re: The transformer screen/shield conundrum

, and if the MV were increased to compensate, the lightly-loaded transformers would deliver too many volts. Of course, seasonal load variations tend to affect each transformer equally, so MV adjustment does work in this case. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk

Re: CE for components?

of components or modules than may strictly be required by the Directives. Indeed, but this is a separate issue from the matter of CE marking -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go

Re: RTTE Directive Member States Notification

to do later in the Directive. I don't have access to a copy at present so I can't say exactly where you will find the information you want. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go

Re: CE marking for professional audio equip

A or class B. The safety standard is EN 60065 and the EMC standards are EN 55103-1 and EN 55103-2. There is no 'Class A' or 'Class B' in EN 55103-1. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go

Re: The transformer screen/shield conundrum

operates. They are about matters which you raised in your responses, and indirectly refer to the crucial matter of supply impedance. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http

Re: CE for components?

. The limitations imposed by the laws of physics are such that many EMC tests, especially those involving radiate energy, have poor reproducibility of results. But better tests are simply not available. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested

Re: Source of noise

the idea that 'CE stops at 30 MHz'? The test for *conducted emissions on the mains lead* goes up to 30 MHz. Emissions at higher frequencies are controlled by the requirements for radiated emissions. The lead is long enough to radiate reasonably efficiently above 30 MHz. -- Regards, John Woodgate, OOO

Re: High Power Transorb

have a 1 ms pulse and had not already taken the time into account -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL

Re: cable maximization - do you or don't you??

results. (;-) -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product

Re: High Power Transorb

for how long? Isn't it the total energy that is critical, not the power? -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL

Re: cable maximization - do you or don't you??

a cable conducted emission requirement? Such a calculation would be extremely difficult, wouldn't it? Even if you could calculate for one cable, dealing with many cables interacting would be hard. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested

Re: cable maximization - do you or don't you??

way for each test (within a centimetre or so in some cases), the results WILL be different - maybe better, maybe worse. The proof of that is a case of 'res ipsa'. If moving the cables had little effect, no-one would bother about maximization or the converse. -- Regards, John Woodgate, OOO - Own

Re: Conducted emissions--green wire?

the same things. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product

Re: Professional Lighting Control Console - the Americas

suggest the UL and CSA equivalents to EN 60065. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from

Re: Equipment I need

product later (not that it should be necessary; the point about the device is that if it's made correctly, the characteristics are calculable). -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go

Re: Professional Lighting Control Console - the Americas

. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical Committee

Re: Generic industrial EMC standards

against which EN 50081-2:1993 is listed as the superseded standard with a DOCOPOCOSS of 1.7.2004. That is so. For practical purposes, are the any differences between these standards, Yes: immunity requirements are introduced above 1 GHz. -- Regards, John Woodgate, OOO - Own Opinions Only

Re: Additivity of Conducted Emission

being CE marked, there is no requirement to add up the emissions for regulatory purposes. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news

Re: NEW EMC Standards

will tell you. All that is required for the 'standards route' is that the limits in the standards that set limits are met. In addition, for either route, the practical requirements of Article 4 of the Directive must be met. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk

Re: voltage dips

. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical Committee

Re: pulse modulation in reverb chambers

. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical

Re: Last day of manufacture EN60950: A4, A11

it advantageous to use this standard rather than the 2000 edition. DOCOPOCOSS - date of cessation of presumption of compliance of the superseded standard. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement

Re: pulse modulation in reverb chambers

at the receiver as a series of overlapping (since their path lengths are less than 300 m) 1 us pulses of varying level. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do

Re: self blinking LEDs as EMI sources WAS: LED lamps

it in oakum and tarring it. After many protestations of disbelief, he disclosed that the leg was made of wood. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do

Re: self blinking LEDs as EMI sources WAS: LED lamps

emission with a spectrum analyser and sniffer loop, or a scanning receiver, whether or not the 50 Hz field is present. But the induced hum would be modulated at the flash rate. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound

Re: Russian Translation for Battery Disposal Marking

, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical Committee emc

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