Patent ID: 7275197

Claim:
A testing apparatus which comprises a plurality of testing module slots to which different types of testing modules for testing a device under test are optionally mounted, comprising at least one synchronization controlling unit for controlling the operation of a first testing module and a second testing module among said plurality of testing modules, said synchronization controlling unit comprising: operation order holding means for holding information indicating that a test operation by the first testing module should be performed before a test operation by the second testing module; trigger return signal receiving means for receiving a trigger return signal from said first testing module, said trigger return signal indicating that said first testing module has completed said test operation thereof, when said test operation of said first testing module has been completed; trigger signal supplying means for supplying a trigger signal to said second testing module, said trigger signal indicating that said second testing module should start said test operation thereof, when said trigger return signal receiving means receives said trigger return signal; an expanded trigger input terminal; and an expanded trigger output terminal.