Patent ID: 6107804
Filing Date: 2000-08-22
Classification: G01R

Abstract:
A method of measuring the amount of an electric charge from an IC, comprising:a) preparing a sample including a charged insulating part and a conductive part having a fixed electric charge and a movable electric charge opposite in polarity to said fixed electric charge, both of said fixed electric charge and said movable electric charge are in said conductive part in the presence of said charge insulating part;b) accumulating said movable electric charge from a conductive lead of said IC into a capacitor means for changing a potential level from an initial value to a final value by contacting said conductive lead of said IC to the capacitor means;c) measuring a difference between said initial value and said final value; andd) calculating the amount of said movable electric charge on the basis of a capacitance of said capacitor means and said difference.