Build Your Own Gauss Meter

Posted on Feb 6, 2014

Have you ever wanted to find out how strong a magnet really was, or how the strength of the magnetic field varied as you changed the distance from the magnet or the temperature of the magnet, or how well a shield placed in front of the magnet worked Voltmeters are fairly inexpensive and easy to find, but where do you purchase a Gaussmeter (also k

Build Your Own Gauss Meter
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nown as a magnetometer). I built a hand-held Gaussmeter for measuring the polarity and strength of a magnetic field. It uses a linear Hall effect device and some op-amps and resistors and things from Radio Shack. Now, with a magnet near the Hall device, you will see the output voltage change. If it is a South pole, the voltage will increase. If it is a North pole, the voltage will decrease. Call this voltage reading V1. We will say that the sensitivity of the Hall device is 2. 50mV/G as found on their data-sheet. Call this k. Therefore, the Magnetic Flux Density you are measuring from that magnet can be calculated as: See how easy that is You can make your own plot using Excel so you don`t have to calculate all the time. If you`re taking measurements, just write down the output voltage and do the calculations later. Pickup covers do affect the magnetic field that the strings vibrate in. The most pronounced drop in gauss is over the slug polepieces. The adjustable polepieces have significantly more power than covered ones.

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