BT52i Magnetic Field Sensor User’s Guide
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3
or the calibration stored in the Coach Sensor Library. The Coach program allows shifting the
pre-defined calibration or creating a new calibration if needed. Use the
Set to zero
option in
Coach to adjust the zero point of the sensor.
Suggested experiments
The Magnetic Field sensor can be used in various experiments such as:
•
Measurements of the magnetic field near a (strong) permanent magnet.
•
Measurements of the magnetic field near a current-carrying wire.
•
Measurements of the magnetic field near or inside a coil or solenoid.
•
The variation of the field when alternating current flows through a coil.
Figure. Measuring the magnetic field near a permanent magnet
.
Magnetic field strength measurement
Magnetic field strength
(also known as the
magnetic flux density
) is a measure of the force the
magnetic field will exert on an electric current or another magnet.
In S.I. units magnetic field strength
is expressed in teslas (T). In cgs units magnetic field
strength
is expressed in gauss (G).
1 G = 1 x 10
-4
T = 0.1 mT and 1 mT = 10 G
Below are given magnetic field strength values of exemplary magnetic sources.
Magnetic field strength
in mT
Magnetic field source
10
-10
– 10
-9
The human brain magnetic field
0.031 - 0.058
The Earth’s magnetic field on its surface
2,5
The Earth's magnetic field in its core
5
A typical refrigerator magnet
10
A small iron magnet
200
A small neodymium-iron-boron (NIB) magnet
1500 - 3000
A medical magnetic resonance imaging electromagnet
