Patent ID: 6535004
Filing Date: 2003-03-18
Classification: G01R

Abstract:
A Ball Grid Array measurement apparatus for testing Ball Grid Array devices, said measurement apparatus containing a test head, comprising:a base or main chuck; an assemblage of ball grid array devices contained within a device strip carrier; fixture means, connected to the base, for holding the ball grid array device strip carrier; actuating means connected to the base, for moving the base in at least one axis in response to a motion control signal; position sensing means, connected to the base, for sensing a position of the base, wherein the position sensing means has a position output; touch sensor means, connected to the base, for sensing contact with the ball grid array when the actuating means moves the base toward the ball grid array, wherein the touch contact means further comprises a plurality of gas pressure backed contact switches, each in a predetermined position, and each having a contact signal; computer sensor means, connected to receive the contact signal; and the position signal, for storing the position of the base at a time of contact to perform electrical measurements of the ball grid array after the ball grid array device has been placed in the measurement position with respect to the test head.