US Patent 7365553 Probe card assembly

A probe card assembly has a probe contractor substrate having a plurality of probe contractor tips thereon and a probe card wiring board with an interposer disposed between the two. Support posts contacting the probe contractor substrate are vertically adjustable until secured by a locking mechanism which is coupled to the probe card wiring board. When the posts are secured in a fixed position, the position is one in which the plane of the plurality of probe contractor substrates is substantially parallel to a predetermined reference plane.