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    • 6. 发明专利
    • COUNTING DEVICE
    • JPS5552985A
    • 1980-04-17
    • JP12586578
    • 1978-10-13
    • TOKYO SHIBAURA ELECTRIC CO
    • MURAYAMA MASAKI
    • G04G3/00G04F3/00G04F5/00
    • PURPOSE:To enable counting time in high accuracy for long time by counting pulses of high frequency produced from an oscillator at every half cycle of commercial alternating current by a timer counter and controlling an oscillator enable by n shift counter. CONSTITUTION:A commercial alternating current is applied through a full-wave rectifier 2 and a waveform shaper 3 to a flip-flop FF5, which is thereupon set at every half wave of the commercial alternating current to allow a timer oscillator 6 to generate a clock pulse of higher frequency than the commercial alternating current. When this clock is counted by a timer counter 9 to count the time and also by a decimal counter 8 to cause the counted value to become 10, the flip-flop FF5 is reset through a detector 10 by the pulse from the counter 8 to enable the oscillator 6. Accordingly, an error is not accumulated in the counter 9 to count the time in high accuracy for long time in response to the commercial alternating current stable in period for long time.