Patent ID: 6337569
Filing Date: 2002-01-08
Classification: G01R

Abstract:
A detection apparatus for detecting a line on an earthed side of an AC power supply including two AC power lines, comprising:power supply terminals configured to be connected to the AC power supply; ground terminals configured to be connected to ground of an electric or electronic equipment; a switching unit configured to selectively connect a first of the two AC lines of the AC power supply to ground of the detection apparatus, the selective connection being changed-over to connect a second of the two AC lines to the ground of the detection apparatus; an antenna unit configured to detect an electromagnetic wave leaking out of the electric or electronic equipment; and a discrimination unit configured to discriminate an earthed side and a non-earthed side of the two AC lines based on a level of the electromagnetic wave and that depends on which of the two AC lines is connected to the ground of the detection apparatus.