CURRENT ROUTE SEARCHING METHOD FOR WIRE

摘要

PROBLEM TO BE SOLVED: To enable searching of a current route of a wire accurately without affecting various devices connected to the wire by detecting the size and the phase of a sinusoidal signal current flowing through the wire with a lockin amplifier. SOLUTION: A sinusoidal signal of a signal generator 1 is applied to a grounding wire 2 for searching a current route while a signal current is divided by a divider 14 to be transmitted to a lockin amplifier 12 with a reference signal line 15. The signal current flowing through the grounding wire 2 is measured in non-contact by a current probe 11, the lock-in amplifier 12 and an oscilloscope 13. In other words, the size and phase of the sinusoidal current flowing through the wire are detected by the lockin amplifier 12 with the sinusoidal signal from the signal generator 1 as reference to track a path through which the sinusoidal current flows. A measurement with a current probe 11 is performed simultaneously or sequentially along an assumed route like current probes 11' and 11" and the current route of a desired grounding wire 2 (wire) can be searched.