It's about as obscure as using "dBuV/m" for field strength Ralph McDiarmid Product Compliance Engineering Solar Business Schneider Electric
From: Ed Price [mailto:edpr...@cox.net] Sent: Monday, February 27, 2017 5:37 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Passive Loop Emissions [General Use] Andrew: I thought that S/m was a unit of electrical conductivity, defined as 0.01 mho/cm. This seems like a useless unit for magnetic field strength. I did find one site: http://www.mdltechnologies.co.uk/wp-content/uploads/2012/05/6512-datasheet.pdf which provides a side-by-side chart for "dBS/m" and Electric Field Strength in "dB/m". At 10 kHz, the antenna factor in db/m is about 86 dB, while the antenna factor in dBS/m is about 35 dB. This sounds like the old relationship of magnetic field strength, in dBuA/m, to electric field strength, in dBuV/m, of 51.5 dB. Ed Price WB6WSN Chula Vista, CA USA -----Original Message----- From: Price, Andrew (Leonardo, UK) [mailto:andrew.p.pr...@leonardocompany.com] Sent: Monday, February 27, 2017 4:16 AM To: mailto:EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Passive Loop Emissions [General Use] Hi All I need some help in obtaining the correct result. The customer has requested an extended magnetic field emission test over the range 100kHz to 2MHz with a limit defined in dBpT. The antenna to be used is an EMCO 6512 which has it correction factors provided in dBS/m which the emission software used does not recognise. So is there a conversion factor that enables the right correction factor to be entered or is the conversion factor only used once a result is obtained?? 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