Test apparatus

A test apparatus for testing a device under test, comprising:

• a signal supply section that supplies a test signal to the device under test via a transmission line;
• and
• a comparing and judging section that receives a response signal from the device under test via the transmission line shared with the signal supply section, and judges whether the device under test is acceptable by referring to a comparison result obtained by comparing a signal level of the response signal with a reference level corresponding to a logic pattern of the test signal, wherein
• the comparing and judging section includes:
• a first comparator that compares the signal level of the response signal with a first reference level to obtain a first comparison result and outputs the first comparison result;
• a second comparator that compares the signal level of the response signal with a second reference level to obtain a second comparison result and outputs the second comparison result, the second reference level being different from the first reference level;
• and
• a selecting and judging section that judges whether the device under test is acceptable, by referring to one of the first comparison result and the second comparison result that is selected in accordance with the logic pattern of the test signal.