Patent ID: 6639410
Filing Date: 2003-10-28
Classification: G01R

Abstract:
An insulation resistance measuring apparatus for capacitive electronic parts that applies a predetermined measurement voltage to a capacitive electronic part, and measures a current flowing through the electronic part so as to calculate an insulation resistance characteristic of the capacitive electronic part, said insulation resistance measuring apparatus comprising:a noise clipper circuit connected in a path leading from a measurement power supply through the capacitive electronic part to a current detector; said noise clipper circuit having a parallel circuit including a first resistor, a first switching means, and a series connected in parallel with one another, said series circuit including a second resistor and a second switching means; at least said first switching means is controlled to remain closed in an early stage of charging the capacitive electronic part; when charging the capacitive electronic part has progressed to some extent, said first switching means is controlled to open and said second switching means is controlled to close; and when charging the capacitive electronic part has further progressed, said first and second switching means are controlled to open.