Measuring magnetic fields requires specialized sensors and knowledge of physics and electronics. You can use a variety of instruments, including gaussmeters, teslameters, fluxmeters, and magnetometers, to measure magnetism, and prices for these units range from pennies to hundreds of thousands of dollars. Learn which sensor fits your application. By Paul Rako, Technical Editor -- EDN, 7/24/2008 All magnetometers measure the B field, rather than the H field. Hall-effect sensors are versatile and have good resolution, but they drift over time and temperature. Instruments can cost pennies to hundreds of thousands of dollars. In one of the earliest magnetic measurements, primitive mariners used lodestones—magnetized pieces of magnetite—to determine the earth’s magnetic field. Today, thousands of applications require the...
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