US Patent 7802160 Test apparatus and calibration method

A test apparatus that tests a device under test is provided, including a driver section that supplies a test signal to a corresponding pin of the device under test, a judgment section that makes a judgment concerning pass/fail of the device under test based on the response signal output by the device under test in response to the test signal, a voltage measuring section that detects a DC voltage of the signal output by the driver section, and an output side adjusting section that adjusts a duty ratio of the signal output by the driver section according to the DC voltage detected by the voltage measuring section.