| 摘要 |
PROBLEM TO BE SOLVED: To specify the generating source of a high frequency current causing electromagnetic wave radiation flowing in a cable connected to a plurality of electronic equipment. SOLUTION: This current measuring device measures current phase distribution on a cable 8, connected to two electronic instruments A, B using two loop antennas 2, 3, an oscilloscope 4 and an information processing device 5 taking in a loop antenna output voltage waveform data. One loop antenna is used for getting a trigger signal, and the other loop antenna is used for measuring the antenna output voltage waveform at each point of the cable 8, while it is swept along the cable 8. There voltage waveforms thus obtained are subjected to a Fourier transform, and a current phase distribution on the cable 8 of every frequency components is sought. In the phase distribution, it is decided that a current flows from the position of a large phase to the position of a small phase, and it is specified that a generating source of the current flowing in the cable 8 exists in an instrument in the direction of larger phase.
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