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Magnet Calibration and StabilityIt is often required that the magnet maintains a very stable magnetisation long after it has been magnetised and does not “droop”. Although rare earth magnets and ferrite do not lose their magnetisation after saturation as Alnico can, there is still a relaxation after magnetisation that in some situations can be problematic. Alternatively, it may be required that the magnet is calibrated (also known as setting, treating or aging) to a particular level for use in a calibrated instrument. If the magnet is “set” then it can be calibrated to a particular level with the aid of an Integrating Fluxmeter, Gaussmeter or other measuring technology as appropriate. Alternatively, the magnet can be “knocked back” by applying a pulse in the opposite direction to the sample to “knock back” the magnetisation, which greatly improves the stability of the magnet. ![]() Next > Mechanical Handling < Previous The Magnetising Energy ![]() |
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