Patent ID: 6407541
Filing Date: 2002-06-18
Classification: G01R

Abstract:
A semiconductor tester comprising:a test head that includes a first docking structure and cam members which are moveable with respect to the first docking structure between a first position and a second position, a machine that includes a second docking structure and cam followers for engaging cam slots in the cam members when the first docking structure is in a predetermined position with respect to the second docking structure and the cam members are in the first position, so that when the cam members are moved to the second position the first and second docking structures are drawn together along a docking axis, at least two sensors carried by one of the first and second docking structures and spaced apart from one another, the sensors cooperating with the other of the first and second docking structures for sensing whether the first docking structure is in said predetermined position with respect to the second docking structure, the sensors being in a first state when the first docking structure is not engaged with the second docking structure and the first docking structure is being brought towards, but has not attained, said predetermined position, and being in a second state when the first docking structure attains said predetermined position.