| 摘要 |
PURPOSE:To enhance time interval measuring accuracy by converting a obtained sufficient voltage into time interval even when the time interval between two points is short, by integrating a constant voltage while sweeping between two points on the measuring waveform and accumulating integrated voltage for plural times. CONSTITUTION:When the potential between an A-point and a B-point desired to be measured becomes high and a start signal is applied to a D-flip-flop 1, an AND gate 2 is opened and a switch means 4 is controlled to an ON-state and a condenser 6 is charged with the output current of a current source 5. When three outputs of an AND gate 9 receiving a finish signal END and a close signal CLOSE are counted, a programmable counter 9 generates output and the Q-output of a D-flip-flop 3, that is, the close signal is brought to low potential and, during this time, the condenser 6 performs integration three times. The falling signal of the close signal is supplied to an analog/digital converter 7 and the terminal voltage of the condenser 6 at this time is converted to digital data which is, in turn, inputted to a control circuit 10.
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