Hi Ralph, If it is *power frequency magnetic field*, then you may use a calibrated gauss meter to measure the magnetic field intensity. You can also use a calibrated clamp meter to measure the current through the loop. With such a measurement, you will be able to calculate the coil factor which would be *Measured magnetic field intensity in A/m divided by the Measured current in A*.
With the coil factor known, you can just the current in the loop in case you want a particular strength of *pulse magnetic field*. Regards, Rajneesh EMI/EMC Compliance Engineer Upper Ground Floor, Building 2A, Tower West, SEZ, Embassy Tech Village, Devarabeesanahalli, Varthur Hobli, Bangalore – 560 087, India Email : [email protected] Office No : +91-80-46523335 On Tue, Jun 21, 2016 at 10:40 PM, John Woodgate <[email protected]> wrote: > Single-turn loops are calculable, provided they are far from any > metalwork, magnetic or not. > > Rectangular loops are often easier to construct than circular. For these, > the mag force H in the centre of the plane is 2D/(pi*A*B), where A and B > are the sides in metres and D is the diagonal. > > With best wishes DESIGN IT IN! OOO – Own Opinions Only > www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England > > > -----Original Message----- > From: Ralph McDiarmid [mailto:[email protected]] > Sent: Tuesday, June 21, 2016 5:28 PM > To: [email protected] > Subject: Re: [PSES] Magnetic Field at 400 A/m > > But how to calibrate such a thing, to know how much magnetizing force is > really being applied to the DUT ? > > Ralph McDiarmid > Product Compliance > Engineering > Solar Business > Schneider Electric > > > > From: Manny Barron [mailto:[email protected]] > Sent: Monday, June 20, 2016 7:54 PM > To: [email protected] > Subject: Re: [PSES] Magnetic Field at 400 A/m > > Back in 1996 when I managed a 3rd party EMC test lab and when the IEC > 1000-4-8 test became mandatory, I built my first magnetic field test setup > using a "hula hoop" from Toys-R-Us. I wound the appropriate amount of > insulated wire loops inside it, and added an appropriate power > supply/transformer and some low resistance high wattage resistors. It > worked great for small products and the 3 or 10 A/m test levels. Today > there are more aesthetically appealing test setups available from various > suppliers. > > Manny Barron > Sr. EMC Engineer > > > > From: Ed Price [mailto:[email protected]] > Sent: Monday, June 20, 2016 7:01 PM > To: mailto:[email protected] > Subject: Re: [PSES] Magnetic Field at 400 A/m > > Grace: > > I used to regularly test equipment to MIL-STD-1399, which had a DC > magnetic field strength exposure requirement of 20 Oersteds, applied for 60 > seconds. Since 1 Oersted is about 79.5 Amps/meter, that was equivalent to a > 1600 Amp/meter field exposure. I did that with a Sorensen 50 ADC power > supply, a 0.001 Ohm sense resistor, a DMM and a custom solenoid coil. The > coil was wound with 163 turns of #12 solid wire, with a coil length of > 711mm and a diameter of 590mm. This was adequate to expose a several unit > high 19” rack-mount EUT. FYI, this antenna had an “antenna factor” of 2.217 > Oersteds/Amp or 175.8 Amps/meter per DC applied Amp, with about 1.6 Ohms > resistance. > > I built the solenoid coil using a “hazardous chemical disposal carboy” > (think big strong plastic garbage can) with a cheap Harbor Freight > appliance dolly bolted to one end. (Not only does this make the antenna > easy to move, but it also greatly aids you winding that 1000 feet of #12 > wire onto the carboy during several hours of Zen meditation.) Of course, if > your EUT is smaller, then you don’t need such a large solenoid; I have a > spreadsheet describing the design and performance characteristics of six > solenoid coils I have built over the years. > > If anyone is interested, I have a description of the coil and the > spreadsheet which I can send off-list. > > Ed Price > WB6WSN > Chula Vista, CA USA > 1961 Amphicar 770 > 2001 Fleetwood Storm 31W > 2008 Ford Explorer > > From: Grace Lin [mailto:[email protected]] > Sent: Monday, June 20, 2016 4:18 PM > To: mailto:[email protected] > Subject: [PSES] Magnetic Field at 400 A/m > > Dear Members, > > Does anyone know which standard requires to have magnetic field evaluated > at 400 A/m? Is there any commercial available instrument (loop) for the > purpose? > > Thank you very much for your time and I look forward to hearing from you. > > Best regards, > Grace Lin > - > ---------------------------------------------------------------- > 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 <mailto: > [email protected]> All emc-pstc postings are archived and searchable on > the web at: > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.ieee-2Dpses.org_emc-2Dpstc.html&d=CwIDaQ&c=IGDlg0lD0b-nebmJJ0Kp8A&r=VJgA_EBUwtT3Y_InIgxxfms70fmGlTJkTWsGAI09Sb0&m=VIi5PTQw6skzQ0Wa7ez0UAXpvTaqFtV_GD_tidrMXFU&s=i1oFB3S9UjMx1LY8WU4ceDLKnQMz2xTE1y9XmTtaank&e= > Attachments are not permitted but the IEEE PSES Online Communities site at > https://urldefense.proofpoint.com/v2/url?u=http-3A__product-2Dcompliance.oc.ieee.org_&d=CwIDaQ&c=IGDlg0lD0b-nebmJJ0Kp8A&r=VJgA_EBUwtT3Y_InIgxxfms70fmGlTJkTWsGAI09Sb0&m=VIi5PTQw6skzQ0Wa7ez0UAXpvTaqFtV_GD_tidrMXFU&s=ExapivDT6CUaHGMPmy3TTsPaJ4_Bml7mgNGng6zhJGU&e= > can be used for graphics (in well-used formats), large files, etc. > Website: > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.ieee-2Dpses.org_&d=CwIDaQ&c=IGDlg0lD0b-nebmJJ0Kp8A&r=VJgA_EBUwtT3Y_InIgxxfms70fmGlTJkTWsGAI09Sb0&m=VIi5PTQw6skzQ0Wa7ez0UAXpvTaqFtV_GD_tidrMXFU&s=HwLdER-x2A5BbpVY65KRfzuYMRGevTrWG_nzu1a6ER8&e= > Instructions: > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.ieee-2Dpses.org_list.html&d=CwIDaQ&c=IGDlg0lD0b-nebmJJ0Kp8A&r=VJgA_EBUwtT3Y_InIgxxfms70fmGlTJkTWsGAI09Sb0&m=VIi5PTQw6skzQ0Wa7ez0UAXpvTaqFtV_GD_tidrMXFU&s=VKI8H4LyxFHwK_bWqGHoGFsT71M_OIdT4JuiKKEb8BA&e= > List rules: > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.ieee-2Dpses.org_listrules.html&d=CwIDaQ&c=IGDlg0lD0b-nebmJJ0Kp8A&r=VJgA_EBUwtT3Y_InIgxxfms70fmGlTJkTWsGAI09Sb0&m=VIi5PTQw6skzQ0Wa7ez0UAXpvTaqFtV_GD_tidrMXFU&s=jqBmKuMUwTub4wkvWOtZls8S-5QCv7dCngfKDYRnY1A&e= > For help, send mail to the list administrators: > Scott Douglas <mailto:[email protected]> Mike Cantwell <mailto: > [email protected]> For policy questions, send mail to: > Jim Bacher <mailto:[email protected]> > David Heald <mailto:[email protected]> > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > ______________________________________________________________________ > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. 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