Measurement Method Using a Gaussmeter (Teslameter)
• Principle: A gaussmeter is an instrument that measures magnetic field intensity based on the Hall effect principle. When an electric current passes through a Hall element placed in a magnetic field, a Hall voltage will be generated in the direction perpendicular to both the current and the magnetic field. The stronger the magnetic field intensity, the higher the Hall voltage. By measuring the Hall voltage, the magnetic field intensity can be calculated.
• Operation Steps: First, place the probe of the gaussmeter close to the surface of the ferrite magnet, ensuring that the probe is perpendicular to the magnet surface to obtain accurate measurement values. Then, read the magnetic field intensity value displayed on the gaussmeter. The unit is usually gauss (G) or tesla (T), where 1 T = 10,000 G. When measuring, pay attention to the position of the measurement point because the magnetic field intensity at different positions of the magnet may vary. For example, for a bar-shaped ferrite magnet, the magnetic field intensity at both ends is usually stronger than that in the middle part.
Measurement Method Using a Fluxmeter
• Principle: A fluxmeter is mainly used to measure magnetic flux, and magnetic flux is related to magnetic field intensity and the passing area (magnetic flux Φ = magnetic field intensity B × area S). By measuring the magnetic flux and combining it with the known measurement area, the magnetic field intensity can be indirectly calculated.
• Operation Steps: First, a test coil is needed. Connect the test coil to the fluxmeter and then place the test coil around the ferrite magnet. Ensure that the relative position between the coil and the magnet is fixed to ensure the accuracy of the measurement. During the measurement, the fluxmeter will display the value of the magnetic flux. If the area of the test coil is known, the magnetic field intensity can be calculated according to the magnetic flux calculation formula. For example, if the measured magnetic flux is Φ and the area of the test coil is S, then the magnetic field intensity B = Φ/S.
Comparison Method Using a Standard Magnet with Known Magnetic Force
• Principle: The magnetic force intensity of a ferrite magnet is roughly judged by comparing it with a standard magnet with a known magnetic force intensity. If two magnets have the same shape and size, their magnetic force intensities can be compared according to their attraction to the same object.
• Operation Steps: Prepare a standard magnet whose magnetic force intensity is known and whose shape and size are as similar as possible to the ferrite magnet to be tested. Place the two magnets close to some small ferromagnetic objects, such as small iron nails, respectively. Observe and compare the number or distance at which they attract the small iron nails. For example, if the standard magnet can attract 5 small iron nails at a distance of 5 centimeters, while the ferrite magnet to be tested can only attract 3 small iron nails at the same distance, it can be roughly judged that the magnetic force intensity of the magnet to be tested is weaker than that of the standard magnet. However, this method is relatively rough and can only provide a rough comparison result.
