The power line radiates at low frequencies. CE control is also RE control in a range where RE control is inaccurate and ineffective. Ken Javor
Phone: (256) 650-5261 ________________________________ From: Derek Walton <[email protected]> List-Post: [email protected] Date: Fri, 11 Feb 2011 11:26:56 -0500 To: <[email protected]>, <[email protected]> Subject: Re: [PSES] EUT power cord length When we get low frequencies like this I'm more concerned about using shared power... And things vacuum cleaners etc that are not even tested... Derek, -----Original Message----- From: Ken Javor <[email protected]> To: [email protected] Sent: Fri, Feb 11, 2011 10:12 am Subject: Re: [PSES] EUT power cord length Rfi limits are met at 3 or 10 meters. The TV owner’s neighbor may be trying to receive a 30 MHz broadcast. In fact, entirely aside from the technical aspects of far field measurements being more accurate, part of the original rationale for the three and ten meter requirements was that an interference caused by the consumer’s own radio reception was not nearly as important as to his neighbor’s, because the consumer could deal with his own rfi issue by turning something off that was under his control. Ken Javor Phone: (256) 650-5261 ________________________________ From: Derek Walton <[email protected]> List-Post: [email protected] Date: Fri, 11 Feb 2011 10:49:49 -0500 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 <http://www.jmwa.demon.co.uk> <http://www.jmwa.demon.co.uk> <http://www.jmwa.demon.co.uk> <http://www.jmwa.demon.co.uk> and www.isce.org.uk <http://www.isce.org.uk> <http://www.isce.org.uk> <http://www.isce.org.uk> <http://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. 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