Permeameter

Permeameter - a type of instrument used for measurement of magnetic properties of magnetically soft materials.

The name was first applied by Silvanus P. Thompson to an apparatus devised by himself in 1890. In his device the mechanical force required to detach one end of the sample from an iron yoke of special form is a measure of the permeability.

The table below lists some of the most commonly used DC permeameters. Their ranges overlap so that the total range of magnetic field strength is from about 4 A/m (0.05 Oe) up to above 400 kA/m (5000 Oe or 5 kOe).