Talk-Polywell.org

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http://www.edn.com/contents/images/6578134.pdf

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An overview of magnetic field measurement methods.

Its like old home week! I routinely work with a 2-meter 3-axis Helmholtz coil these days, measuring with fluxgates and magnetoresistive bridges down to a few nanoteslas, and I made some custom magnetometers from Allegro Hall effect chips at EMC2.

The Allegro devices are dirt cheap and very easy to use.