--0__=85256A95005F86928f9e8a93df938690918c85256A95005F8692 Content-type: text/plain; charset=us-ascii While at "the fence"... I looked at using hall effect sensors on the dog collars. Our flux density was about 9nT and this didn't even come close to what a hall effect sensor would respond too. This was generated by a 4" square coil that had about 12Ampere turns and a distance of 10'. Kind of like bringing a soccer ball to a football game..... Scott David Minkler cc: Sent by: pic Subject: Re: [EE]: Magnetic field strength microcontrolle r discussion list 07/26/01 12:24 PM Please respond to pic microcontrolle r discussion list Andrew, I get 4.8 microgauss. Orders of magnitude below the noise and offset threshold for a hall effect device. Regards, Dave Andrew Seddon wrote: > > Hi all.. > > Prehaps somebody could help me working out the following, I`ve done it > myself but I keep getting results that just don`t look right. > > There is a coil that is producing a magnetic field strength(H) of 25.8 > dBuA/m at 10 m. I make this 0.000381 A/m. I want to then convert this to > flux density(B) in Gauss. So as I understand it the formula is. > > Flux Density(B) = Field Strength(H) x Permability of Material. > > I work this out using the permability of air and don`t seem to get the right > answer. > > In case anybody is wondering i`m trying to work out if it`s possible to > detect a certain coil at 10m using a hall effect sensor. > > Any help appreciated. > > _________________________________________________________________ > Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp > > -- > http://www.piclist.com hint: PICList Posts must start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! 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