A method to measure common mode voltages and balun efficiency is described. Common mode voltages were measured with a novel common mode measurement probe and oscilloscope along a coaxial cable of a loaded loop coil which was excited with a network analyzer at 127.74MHz. The common mode measurements were performed on the loop coil without a balun and compared to the same loop coil with a balun to evaluate the common mode attenuation of the balun.
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