Patent ID: 7268574

Claim:
An apparatus for testing microfeature workpieces, comprising: a first support member configured to releasably carry a microfeature workpiece; a second support member positioned proximate to the first support member, the second support member being configured to carry an electrical testing device for microfeature workpieces, at least one of the first and second support members being movable toward and away from the other; a signal source positioned proximate to the first support member, wherein the signal source is positioned to direct a signal across a planar support surface of the first support member when the first support member does not carry a microfeature workpiece, and wherein the signal source is positioned to direct radiation across a planar surface of a microfeature workpiece when the first support member does carry the microfeature workpiece; and a signal sensor positioned at least proximate to the first support member and the signal source, the signal sensor being configured to receive at least a portion of the signal directed by the signal source and passing proximate to the first support member.