Patent ID: 7057365

Claim:
A prober comprising: a frame having a frame ground terminal; a chuck stage for placing a device under test; at least one servo motor for driving the chuck stage, each servo motor having a ground terminal; at least one servo amplifier connected to the servo motor, each servo amplifier having a ground terminal; at least one first floating mount on which the at least one servo amplifier is provided, the first floating mount being electrically insulated from the frame and being provided with a first ground terminal that is connected to the ground terminal of the servo amplifier; at least one second floating mount on which at least one of the at least one servo motor is provided, each second floating mount being electrically insulated from the frame and being provided with a second ground terminal that is connected to the ground terminal of each of the at least one servo motor; a shielded cable that connects the servo amplifier and the servo motor; a first wire that connects the first ground terminal and the frame ground terminal and that connects the first ground terminal and the second floating mount; and a second wire that connects the shielded cable and the frame ground terminal.