Time domain measure system of the magnetic shielding effectiveness

In order to measure the magnetic shielding effectiveness of buildings such as reinforced concrete construction, metal enclosure, a portable measurement device was developed. Its principle, structure and parameters are introduced in this paper. In order to improve performance the optic fiber system was used in the system. The measure program was written in Matlab. A wide range of frequency properties can be obtained from one time-domain measurement. Finally an example is presented.