Saturation permeameter

Abstract

The saturation permeameter is a device for speedy and accurate measurement of saturation value of magnetic material; that is, for measurement of the limiting value of intrinsic induction (s) characteristic of that material. The permeameter in its present form is of the well-known bar-yoke type, with a magnetizing coil capable of producing a magnetizing force of H = 4500 g. without excessive heating. The permeameter is equipped with a compensating coil whose function is to compensate automatically for the spatial flux enclosed by the potential coil, so that the ballistic deflections indicate the saturation value without further computation or correction. The permeameter is available for accurate measurement of saturation value of such material as is saturated well within the working range of the permeameter, i. e., with a magnetizing force of H = 8000 g., or less, which includes all magnetic material used for electrical engineering purposes except those for permanent magnets and cobalt. The saturation permeameter is also available for approximately correct measurement of B or s, for range of H below the saturation point as far down as H = 200 g. In speed of testing and accuracy of the measured saturation value, this permeameter surpasses all devices for saturation measurement developed heretofore.