Abstract
The magnetic fields in single sheet testers are quantitatively investigated in order to develope an improved tester. The effects of quarity and thickness of the specimen, the stacking method of yoke and the air gap between specimen and yoke on the accuracy of the H coil method and the IEC method are analysed.
The results obtained can be summarized as follows:
(1) The error of magnetic field strength is increased when the permeability and the thickness of specimen, and the gap width between the specimen and the yoke are increased.
(2) The stacking methods of yoke give a small influence on the accuracy of magnetic field strength.
(3) The accuracy of magnetic field strength measured by the H coil method is 10 times better than that by the IEC method.
