Patent ID: 7253649
Filing Date: 2007-08-07
Classification: G01R

Abstract:
1. A probe measurement system for a wafer mounted with the surface to be measured facing downward, said system comprising: a probe head with a flat face oriented upward with at least one probe passage defined through the probe head ending in an orifice on said face with said face disposed to make contact with the downward facing surface of said wafer during testing; a mercury supply system disposed to provide mercury to said at least one probe passage and to extend mercury to the opening on said face with a mercury contact made with the surface of the wafer from each of said at least one probe passage when the face of the probe head is in contact with the surface of the wafer; and a probe head positioning system to advance and retract said probe head to and from contact with the surface of the wafer before and after probing the surface of the wafer including: