The easiest to way to calibrate a magnetic field sensor in the audio frequency range is with a Helmholtz coil or a solenoidal coil. A Helmholtz coil is two coils of radius r with the planes of the loops also separated by distance r. The magnetic field between the coils and at the center of either type coil is very uniform and solely a function of coil current and geometry (frequency independent). If you monitor coil current with an ammeter of sufficient bandwidth (any handheld DVM like a Fluke will likely do) that is the only measurement you need to determine the field.
You can find all the equations at: http://www.geocities.com/CapeCanaveral/Hall/6153/ Have fun! Ken Javor ---------- >From: [email protected] (Jim Bacher) >To: Mirko Matejic <[email protected]>, [email protected] >Cc: Mothish <[email protected]> >Subject: Re[2]: assist me >Date: Wed, Jan 3, 2001, 9:45 AM > > > Forwarding for Mothish, please keep him on your cc list as you respond. > > ____________________Reply Separator____________________ > > --- Mothish <[email protected]> wrote: >> >> > >> > ---------- >> > From: Mothish[SMTP:[email protected]] >> > Sent: Monday, January 01, 2001 10:24:56 AM >> > To: [email protected] >> > Subject: assist me >> > Auto forwarded by a Rule >> > >> helo sir, >> i got ur email id from iric.com. >> iam doing my project work for my engineering >> studies.(chennai,tamil >> nadu, INDIA) >> i have selected magnetic field sensor,for radiated >> emmision testing. >> i seek ur help for me to know the necessity of loop >> calibration(we are >> using loop ant. for 20Hz-50KHz range. >> plz provide me with the information iam in need of. >> or give me some contacts to whom i can clarify my >> doubts in future. >> >> seeking ur help barely. >> expecting ur reply. >> bye >> >> SINCERLY, >> MOTHISH BABU >> > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Jim Bacher: [email protected] > Michael Garretson: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
