Fluxmeter test principle

The fluxmeter can measure the magnetic flux of a single magnet and multiple magnets. When the fluxmeter measures the change of the magnetic flux in the Helmholtz coil, it is a magnetic field measuring instrument that determines the magnetic flux according to the changing magnetic field. In the closed loop formed by the measuring coil and the movable frame winding of the fluxmeter, when the magnetic flux Φ in the measuring coil changes, an induced current passes through the frame winding, causing the frame to generate a certain deflection α, and Φ and α are proportional to the magnetic flux. (Wb) is Φ=(cα/N)×10-3 (1) where c is the Helmholtz coil constant; N is the number of turns of the measuring coil.

According to the value of the magnetic flux Φ and the volume of the test sample, the magnetic moment M, the remanence Br, the coercive force HC, and the maximum magnetic energy product BHmax can be calculated using the formula.