Patent ID: 6466027
Filing Date: 2002-10-15
Classification: G01R

Abstract:
An apparatus for measuring an electrostatic charge on a sample semiconductor device comprising: a conductive plate; a voltage source; a first switch for connecting said conductive plate to said voltage source or to a ground potential; an insulator membrane arranged on said conductive plate for placement of said sample semiconductive device thereon; a conductive grounded plate arranged parallel to and spaced from said conductive plate and said insulator membrane; a conductive probe secured to said grounded plate through an insulator material for picking up an electrostatic charge induced in said sample element from a surface of said sample semiconductor device; a coulomb meter with a first electrode connected to said grounded plate for indicating a quantity of said electrostatic charge; and a second switch for connecting said probe to a second electrode of said coulomb meter or said grounded plate.