| 摘要 |
PROBLEM TO BE SOLVED: To determine a non-defective product by simplifying an operation confirmation to test an analog-to-digital converter, and externally variable changing a comparison accuracy to meet a circumferential condition at inspection. SOLUTION: An analog-to-digital converter inspecting circuit 14 for checking an operation/non-operation is connected to the analog-to-digital converter 1 as a reference. Further, a comparator 12 for comparing converted value of an analog-to-digital converter 2 to be decided for its non-defectiveness or defectiveness with that of the converter 1 is provided, and the non-defectiveness or defectiveness of the converter 2 is decided according to an allowable error input 9.
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