| 摘要 |
A mesuring instrument for measuring the characteristics of a transmission circuit for transmitting a signal, wherein the transmission circuit comprises an electric signal transmitting section for transmitting a transmission signal, an electrooptical converting section for converting the transmission signal into an optical signal, a section for transmitting the optical signal, a photoelectric conversion circuit for converting an optical signal into an electric signal, a level measuring section for detecting the data value of an electric signal by comparing the strength of an electric signal outputted from the photoelectric conversion circuit with a predetermined reference level, an electric signal receiving section for detecting the data value of the electric signal, and a timing control section for controlling the latching timing at which the electric signal receiving section detects the data value of the electric signal. The measuring instrument comprises a comparing section for comparing the data value of an electric signal taken in at the electric signal receiving section with a predetermined expected value, a setting control section for varying a reference level and a latch timing sequentially, and a section for storing the comparison results from the comparing section for each reference level and latch timing.
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