Patent ID: 7119547

Claim:
A testing apparatus for testing a device under test by supplying a current to said device under test, comprising: a first power supply unit for generating a current to be supplied to said device under test; and first and second coaxial cables through which said current generated by said first power supply unit is supplied to said device under test, wherein said first power supply unit comprises: a current detecting unit for detecting an amount of a voltage drop when said current generated by said first power supply unit passes through a predetermined resistor; and a current controlling unit for controlling said current being supplied to said device under test in response to said amount of said voltage drop detected by said current detecting unit, said first coaxial cable comprises: a first internal conductor for conducting said current from said first power supply unit towards said device under test; and a first external conductor provided around said first internal conductor with an insulator interposed therebetween for conducting said current from said device under test towards said first power supply unit, and said second coaxial cable comprises: a second internal conductor for conducting said current from said device under test towards said first power supply unit; and a second external conductor around said second internal conductor with an insulator interposed therebetween for conducting said current from said first power supply unit towards said device under test, wherein said first internal conductor, said first external conductor, said second internal conductor, and said second external conductor are connected to said device under test.