Patent ID: 7543202

Claim:
A test apparatus that tests a device under test, comprising: a plurality of signal input/output units each of which includes a signal output section that outputs a signal to a terminal of a device under test and a signal input section that inputs the signal outputted from the terminal; a first adjustment section that adjusts each signal input/output unit such that the phase difference between a time at which the signal output section outputs a signal and a time at which the signal input section inputs the signal is the same as that of the other signal input/output units; an amount of shift detecting section that detects a first amount of shift to shift a signal input timing of the signal input section in order to input a signal outputted by the signal output section in the first signal input/output unit by the signal input section in the second signal input/output unit, and a second amount of shift to shift a signal input timing of the signal input section in order to input a signal outputted by the signal output section in the second input/output unit by the signal input section in the first signal input/output unit in a state that the plurality of signal input/output units are connected to each other for adjustment; a calculating section that calculates the amount of phase difference between the first signal input/output unit and the second signal input/output unit based on the first amount of shift and the second amount of shift; and a second adjustment section that adjusts such that the phases of the signal outputs and the phases of the signal inputs between the first signal input/output unit and the second signal input/output unit are substantially equal to each other based on the amount of phase difference.