Oh, I hit send too soon.... The people who care, test wisely. It's another term for people that test blindly....
Cheers, Derek. -----Original Message----- From: Larry Stillings <[email protected]> To: 'Derek Walton' <[email protected]>; [email protected]; [email protected]; [email protected] Sent: Fri, Feb 11, 2011 10:41 am Subject: RE: [PSES] EUT power cord length Derek, All, I have been in the testing business for the last 21 years. So I personally would prefer more restrictions (testing requirements) like the European model, testing any and all products from DC to daylight that could cause potential interference. The truth of the matter is the people whom care test, and the people whom don't care, don't test. Maybe when I retire I will feel differently ;-). Larry ________________________________ From: Derek Walton [mailto:[email protected] <mailto:[email protected]?> ] Sent: Friday, February 11, 2011 11:24 AM To: [email protected]; [email protected]; [email protected] Subject: Re: [PSES] EUT power cord length If you like watching the quality of a Plasma TV, you are unlikely to listen to AM radio ( there may be a DISPROPORTIONATE number of people on this list that do ). Again, this means at the same time... I imagine if any, let me makes that bigger IF ANY interference were to occur, you would treat that like anything else that interfered... Were talking probability. An imperceptibly small possibility of an event Vs a 100% guarentee of increased complexity and cost to get products to market. Doesn't that raise hackles? We need LESS restrictions not more. The next step will be to have ALL products tested from DC to daylight! Cheers, Derek. -----Original Message----- From: Pettit, Ghery <[email protected]> To: Derek Walton <[email protected]>; [email protected] <[email protected]>; [email protected] <[email protected]> Sent: Fri, Feb 11, 2011 10:14 am Subject: RE: [PSES] EUT power cord length But what portion of them listen to AM radio? That's under 30 MHz. And, as a licensed user of portions of the HF spectrum I will be upset if I suffer interference from these devices. Ghery S. Pettit From: [email protected] [mailto:[email protected] <mailto:[email protected]?> ] On Behalf Of Derek Walton Sent: Friday, February 11, 2011 7:50 AM To: [email protected]; [email protected] Subject: Re: [PSES] EUT power cord length That may be, but what portion of Plasma TV owners have SW radios... and are likely to be using them at the same time.. We should not be pursuing limits for Possible interference, only Probable. Otherwise we would never be able to get stuff to market.. at a price a consumer can afford. Cheers, Derek. -----Original Message----- From: Ken Javor <[email protected]> To: [email protected] Sent: Fri, Feb 11, 2011 9:33 am Subject: Re: [PSES] EUT power cord length Ummm, 30 MHz is the upper end of the short wave or high frequency band. Ken Javor Phone: (256) 650-5261 ________________________________ From: Derek Walton <[email protected]> List-Post: [email protected] Date: Fri, 11 Feb 2011 10:17:56 -0500 To: <[email protected]>, <Ral [email protected]>, <[email protected]> Subject: Re: [PSES] EUT power cord length And what does this unique device interfere with? I'm sure lots of things radiate, but if there's nothing to interfere with, that matters, who cares? -----Original Message----- From: Grasso, Charles <[email protected]> To: [email protected] <[email protected]>; [email protected] <[email protected]> Sent: Fri, Feb 11, 2011 8:53 am Subject: RE: [PSES] EUT power cord length Hello - Plasmas *do* radiate significantly below 30MHz, It is a function of their technology. From: [email protected] [mailto:[email protected] <mailto:[email protected]?> <mailto:[email protected]?> ] On Behalf Of [email protected] Sent: Wednesday, February 09, 2011 11:02 AM To: [email protected] Subject: Re: [PSES] EUT power cord length I'm surprised that something as small as a plasma television receiver would radiate effectively below 30Mhz, especially if its mains conducted emissions are below the limits. Could it be the attached cables that are the radiators and if so, then perhaps those signal ports need a conducted emissions test. _______________________________________ _____________________________________________ Ralph McDiarmid | Schneider Electric | Renewable Energies Business | CANADA | Regulatory Engineer From: John Woodgate <[email protected]> To: [email protected] Date: 02/09/2011 07:29 AM Subject: Re: [PSES] EUT power cord length ________________________________ In message <[email protected]>, dated Wed, 9 Feb 2011, Derek Walton <[email protected]> writes: >I'd be strongly in favor of moving the conducted/radiated testing >transition to around the 100 MHz region and setting test distance at a >standard 3 meters also. That would be for both emissions and immunity. > >Any organization working on something like this? The IEC/CISPR is being asked to look at standards for radiated emissions below 30 MHz, instead! Large plasma TVs and electric vehicles are said to cause disturbances in this frequency range due to radiated emissions. Methods of measurement for magnetic field emissions are in some cases already known, but the disturbances are said to be due to electric fields. If it was easy, it wouldn't be so fascinating. (;-) -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK Plural: data, criteria, phenomena. Singular: datum (different meaning: use 'data element' for a single item), criterion, phenomenon. 'Effect' is a noun, 'affect' is a verb (except in psychiatry). - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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