Patent ID: 7336885

Claim:
A test apparatus for testing a device under test, comprising: a test head for applying a test pattern to the device under test; a main frame for controlling test sequences of the test head; and a optical coupler for coupling the main frame and the test head, wherein the optical coupler including: a plurality of optical fiber cables for optically coupling the main frame and the test head; a cable storage chain for bundling a stored portion except for a non-stored portion in a part of the test head side and a non-stored portion in a part of the main frame side of the plurality of optical fiber cables and storing the same, wherein the cable storage chain is disposed between the test head side cable storage unit and the main frame side cable storage unit, wherein the cable storage chain has a space along the longitudinal direction thereof, wherein the optical fiber cables are stored within the space, and wherein the cable storage chain has a plurality of pieces therein configured to be rotatably connected to each other in the longitudinal direction of the cable storage chain; a test head side cable storage unit provided at the boundary between the non-stored portion and the stored portion of the plurality of optical fiber cables on the test head side and being capable of adjusting a length for storing therein the non-stored portion on the test head side; and a main frame side cable storage unit provided at the boundary between the non-stored portion and the stored portion of the plurality of optical fiber cables on the main frame side and being capable of adjusting a length for storing therein the non-stored portion on the main frame side.