| 摘要 |
A measurement apparatus is provided for measuring at least one of the switching times of the output signals output from a device under test. The measurement apparatus comprises: a first light-emitting unit having a function whereby light emission starts in a case that the voltage of the output signal becomes equal to or greater than a first threshold voltage; a second light-emitting unit having a function whereby light emission starts in a case that the voltage of the output signal becomes equal to or greater than a second threshold voltage that is higher than the first threshold voltage; a first light reception unit which receives light emitted from the first light-emitting unit; a second light reception unit which receives light emitted from the second light-emitting unit; and a measurement unit which measures the switching time required for the voltage to switch between the first threshold voltage and the second threshold voltage, based upon at least one of the difference in the light-emission start timing and the difference in the light-emission stop timing between the first light-emitting unit and the second light-emitting unit.
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