| 摘要 |
The potential comparator includes input wires 3 and 4 that input a differential signal output from a test object 2, a high-threshold side divided-voltage generating section 5 that acquires the differential signal from each of the input wires 3 and 4 and generates and outputs the first divided voltage and the second divided voltage that are a divided voltage based on a predetermined high threshold potential V<SUB>OH </SUB>and an electric potential of the acquired differential signal, a high-threshold side potential comparator 6 that derives a magnitude relation between the first and the second divided voltages output from the high-threshold side divided-voltage generating section 5. The high-threshold side divided-voltage generating section 5 includes a first divided-voltage generating section 16 and a second divided-voltage generating section 17, which respectively generate the first and the second divided voltages of a value in which a magnitude relation between the first and the second divided voltages in the high-threshold side potential comparator 6 corresponds to a magnitude relation between a potential difference between a plus signal and a minus signal and a high threshold potential.
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