There is disclosed an assembly for use in testing ball grid array devices, the assembly including a novel ball alignment plate. The ball alignment plate is a thin material having a pattern of holes precisely formed therethrough. The pattern of holes is formed to match the array pattern of the ball grid...http://www.google.com/patents/US6927588?utm_source=gb-gplus-sharePatent US6927588 - Ball alignment plate testing apparatus and method for testing semiconductor chips
