Patent ID: 6316949
Filing Date: 2001-11-13
Classification: G01R

Abstract:
A testing apparatus for testing conductivity of an electric pathway formed on a substrate, the pathway including a first wiring having an input portion, and a second wiring connected with the first wiring and arranged above the first wiring and at least partially overlapping the first wiring, the testing apparatus comprising:a first electric signal applier for applying a first electric signal to the input portion of the first wiring;a first electrode facing a first portion of the second wiring with a gap to be capacitively coupled therewith;a second electrode facing a second portion of the second wiring with a gap to be capacitively coupled therewith;a second electric signal applier for applying a second electric signal to the second electrode, the second electric signal changing its electric parameter in the phase reverse to that of the first electric signal; anda monitor connected to the first electrode for monitoring the signal transmitted to the first electrode through its capacitive coupling.