Patent ID: 6297656
Filing Date: 2001-10-02
Classification: G01R

Abstract:
A probe-test method comprising steps of:placing an object of examination on a main chuck adapted to move along X-, Y-, Z- and .theta.-directions;aligning the main chuck with probes held to respective locations above the main chuck;raising the main chuck toward the probes to make the object contact with the probes, and overdriving the main chuck, to thereby completely effect electric conduction between the object and the probes; andexamining the object to determine certain electric characteristics thereof;characterized by further comprising steps of:predicting the displacement of each of the positions on the object to be brought into contact with the corresponding one of the probes, which occurs in the X-, Y- and Z-directions due to the tilt of the main chuck caused by overdriving the object on the main chuck for the probes, on the basis of given data;determining by arithmetic operation the distance for the position to be corrected at least in one of the X-, Y- and Z-directions in order to reduce the predicted displacement; anddetermining the position for the main chuck to be overdriven according to the distance of correction.