Patent ID: 7286742

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 a test sequence of said test head; and a fibre optic cable unit for optically coupling said main frame and said test head, wherein said fibre optic cable unit comprises: a cable group comprising a plurality of fibre optic cables layered in an overlapped direction, said fibre optic cable comprising a plurality of fibre optic cores arranged in the arrangement direction: a cable containing chain for holding said layered plurality of fibre optic cables so that said fibre optic cables can slide each other, said cable containing chain being bendable in the overlapped direction; and a slide sheet provided between said layered plurality of fibre optic cables, the slide sheet holding said layered plurality of fibre optic cables so that said plurality of fibre optic cables can slide each other.