Abstract
We measured the magnetic shielding effectiveness of a cubic box constructed from grain-oriented silicon steel sheets. We also measured the effect of varying the box wall thickness on the shielding effectiveness. Experimental results were compared with theoretical expected results. We found that the shielding effectiveness for an alternating magnetic field in the 30 Hz to 5 kHz range was qualitatively explained by the permeability of materials and eddy currents in materials, and susceptible to the gap at the joint of the shielding materials.
