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Metal Detectors
General Metal Detector Discussion
Super magnet effect on detectors and coils
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<blockquote data-quote="Hilux" data-source="post: 653521" data-attributes="member: 23052"><p>From what I understand when the magnets like the ones you have used are placed on a metal surface the flux path for the magnetic field is closed so very little external metal field remains. The flux or magnetic lines of force go out of the magnet face into the sheet metal. They travel through a short section of the sheet metal and then back into the periphery of the shield over the magnet. I can't remember what it is but there's a particular name for the cup over the back of the magnet.</p><p></p><p>The normal RAM/SRAM/NVRAM and other circuitry is impervious to static magnetic fields. I had to check but even the more recent FRAM (ferroelectric RAM about 10 years old??) is immune.</p><p></p><p>It's a different kettle of fish if the unit is turned on and strong magnets are moved around close by!</p></blockquote><p></p>
[QUOTE="Hilux, post: 653521, member: 23052"] From what I understand when the magnets like the ones you have used are placed on a metal surface the flux path for the magnetic field is closed so very little external metal field remains. The flux or magnetic lines of force go out of the magnet face into the sheet metal. They travel through a short section of the sheet metal and then back into the periphery of the shield over the magnet. I can't remember what it is but there's a particular name for the cup over the back of the magnet. The normal RAM/SRAM/NVRAM and other circuitry is impervious to static magnetic fields. I had to check but even the more recent FRAM (ferroelectric RAM about 10 years old??) is immune. It's a different kettle of fish if the unit is turned on and strong magnets are moved around close by! [/QUOTE]
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Metal Detectors
General Metal Detector Discussion
Super magnet effect on detectors and coils
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