Patent ID: 8400174
Filing Date: 2013-03-19
Classification: G01R

Abstract:
1. A method of correcting a position of a prober, the method comprising: obtaining a first image of a pad, the pad having a predetermined reference contact position; contacting the prober to the pad after obtaining the first image of the pad; obtaining a second image of the pad after contacting the prober to the pad; determining an actual contact position of an actual contact mark on the pad, the actual contact mark being produced by the contacting of the prober to the pad; comparing the second image to the first image to obtain an offset data, the offset data relating the actual contact position to the reference contact position; and correcting the position of the prober by aligning the actual contact position with the reference contact position based on the offset data, wherein: the prober includes needles arranged in a zigzag pattern, and the reference contact position corresponds to an edge portion of the pad, the edge portion being between a side of the pad and a central portion of the pad.