Patent ID: 7227351

Claim:
A parallel test apparatus comprising: a power supply configured to provide a test current to devices under test (DUTs), the DUTs connected to the power supply in a parallel manner, the power supply having power sources; switching devices, each switching device connected between a corresponding one of the DUTs and one of the power sources, each switching device configured to selectively provide the test current to the corresponding one of the DUTs, wherein at least one switching device is connected to a first one of the power sources and at least one other switching device is connected to a second one of the power sources; and at least one control unit configured to control the switching devices such that a maximum test current generated by the corresponding one of the power sources is provided to the corresponding one of the DUTs, wherein the test current is provided only to one DUT out of the plurality of DUTs connected in a parallel manner according to the operation of the switching device, and wherein the at least one control unit is configured to control the switching devices such that a maximum test current generated by the corresponding one of the power sources is provided to the corresponding one of the DUTs during a first process, and the maximum test current generated by the corresponding one of the power sources is divided between more than one of the DUTs during a second process.