>-----Original Message-----
>From: Gordon,Ian [mailto:[email protected]]
>Sent: Thursday, January 23, 2003 7:15 AM
>To: 'IEEE EMC-PSTC GROUP'
>Subject: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS
>
>
>
>All
>I would like to construct a Helmholtz coil to perform magnetic field
>immunity testing at DC frequencies and thus simulate the effect of a
>permanent magnet. There are some details on construction in EN61000-4-8
>which details power frequency magnetic field immunity testing
>within the
>scope of the EMC directive. However the fields referred to are
>measured in
>A/m, whereas I need a field of, for example, 5mTesla.
>Can anybody advise me as to how to construct such a coil with
>a test volume
>of 0.5 x 0.5 x 0.5m and a field of 5mTesla?
>Thanks
>Ian Gordon
>
>
Gordon, are you sure your numbers are correct? 5 milliTesla is equivalent
to:
50 Gauss
4014 A/M
192 dBuA/M
194 dBpT
and, if it were the H-field component of a plane wave:
1.5 million V/M
243 dBuV/M
6 x 10^^9 Watts/sq Meter
I have a spreadsheet that calculates these values. I'll send you a copy
off-line. Verify your requirements, and then we can find what you need to
build.
Ed
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