Basic Characteristics of 3-dimensional Helmholtz Coils for Radiated Immunity Test

Abstract

Basic characteristics of 3-dimensional Helmholtz coils for radiated immunity test have been studied. The coils can excite the magnetic fields of an arbitrary direction. By applying the fields to equipment under test (EUT), the immunity characteristics of EUT for the magnetic field of an arbitrary direction is made clear. Computer calculation is done to evaluate the field uniformity that is necessary for radiated immunity testing. Moreover, the experiment using the small prototype is done to verify the estimation. The results show that the excited field have the uniformity necessary for radiated immunity test.