REVISION OF JEITA STANDARD ABOUT EVALUATION METHOD FOR SHIELDING PERFORMANCE OF MAGNETICALLY SHIELDED ROOMS AND EVALUATION OF ACTUAL ROOM USING THIS STANDARD

The shielding performance of a magnetically shielded room (MSR) for bio-magnetic measurement was evaluated using JEITA standard (EM-4502 and EM-4503). In the process evaluation, some problems were extracted, such as fact that MSR shape not covered by standard. Therefore, authors revised EM-4502 EM-4503. main points revision are expansion target reexamination placement conditions accuracy exciting coils. Finally, EM-4502A EM-4503A formulated standards used to reevaluate aforementioned MSR.