Patent ID: 7486089

Claim:
A method for controlling parallelism between a probe card and a mounting table when inspecting electrical characteristics of a target object by allowing the probe card having a number of probe pins to electrically contact the target object on the mounting table, the method comprising: a first step of selecting, among the probe pins, one or more probe pins corresponding to each of plural distinct locations on an X-Y coordinate system whose origin lies at a probe center; a second step of detecting a tip of each of the selected probe pins and obtaining position coordinates (X,Y,Z) thereof; a third step of selecting a specific point on each of connection lines connecting tips of neighboring selected probe pins, the specific point being located between the probe pins defining the line on which the specific point is located, and calculating position coordinates of the specific points on the connection lines, wherein the position coordinates of the specific points are set as position coordinates (X,Y,Z) of tips of imaginary probe pins; and a fourth step of adjusting the parallelism between the probe card and the mounting table based on the position coordinates (X,Y,Z) of the tips of the imaginary probe pins.