Patent ID: 7298150

Claim:
A test apparatus for testing a device under test, the test apparatus comprising: a reference voltage supply section for supplying a reference voltage; a field effect transistor provided between a positive side terminal and a negative side terminal of the reference voltage supply section so that a drain terminal and a source terminal of the field effect transistor are in parallel connection with the device under test; an inductance that is connected between the positive side terminal and the negative side terminal of the reference voltage supply section, the inductance being in serial connection with the device under test between a positive-side power supply terminal and a negative-side power supply terminal of the device under test, and being in serial connection with the field effect transistor between the drain terminal and the source terminal of the field effect transistor; a control section for controlling a gate voltage of the field effect transistor, thereby changing a power supply voltage to be supplied to the device under test; and a judgment section for judging quality of the device under test, based on characteristic of the device under test in accordance with change in the power supply voltage.