| 摘要 |
A power supply line on the earthed side of an AC power supply is detected in order to prevent the leakage of an electromagnetic wave. A detection apparatus detects the AC line on the earthed side of the AC power supply. A power supply terminal is provided to be connected to the AC power supply. Ground terminals are provided to be connected to ground of an electric equipment. A switching unit selectively connects either of AC lines connected with the AC power supply to ground of the detection apparatus, the selective connection being changed-over. An antenna unit detects an electromagnetic wave leaking out of the electric or electronic equipment. And, a discrimination unit discriminates an earthed side and a non-earthed side of the AC lines on the basis of a level of the electromagnetic wave and based on which of the AC lines is connected to the ground of the detection apparatus.
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