Magnet calibration

The MCSD series of precision Magnet Charger Setter Demagnetisers has been designed as a flexible magnet processor for the laboratory and as the production workhorse where calibrating (stabilising, setting or ageing) all types of permanent magnets is required.
These units offer functions that are known by various names including Magnet Treaters, Magnet Setters, Magnet Agers, Magnet Calibrators.

Why calibrate a magnet?

There may be a number of reasons for calibrating a magnet, the most common are

  • Knock back for stability
  • Calibration to a specific level

Certain grades of magnets, particularly Alnico and magnets from that family will exhibit an unwanted behaviour after magnetising. After fully magnetising the magnet, the magnet will slowly loose some of its magnetisation over time. In order to mitigate this effect, it is often necessary to knock back, or artificially age the magnet to put it into a stable state where it will no longer loose magnetisation. Terms for this including knock back, setting, calibrating and treating magnets.

Calibration for a specific level is another requirement. If the magnet is to be used in a sensor, or a moving coil meter, light aircraft compass or a number of other applications then its exact magnetisation level may be important. In this case the magnet is also knocked back until it achieves a desired level that is determined via some kind of external feedback such as a gaussmeter, fluxmeter or even in the case of microwave isolators and circulators a network analysiser.

The MCSD system

Hirst’s range of MCSD systems (Magnetiser Calibrator Setter Demagnetiser) are designed for the knockback, setting, calibrating and treating of permanent magnets. One of the most common applications is sensors and other small scale items, this is where the MCSD100-800J range comes in. These are bench top units that can be connected with other equipment or even a PC to calibrate magnets to specific levels.

It is also possible to manually calibrate the magnets using the easy to use buttons on the front panel.

Large MCSD machines

MCSD functions can also be added to our larger range of magnetisers. In the standard M Range from 8 – 67kJ we can add output option to allow reverse polarity and setting waveforms and these systems also work with a PC for SPC data capture and logging