| 摘要 |
PURPOSE:To forcibly reset a pulse motor driven type measuring instrument at the start of operation, by reversily rotating a pulse motor only corresponding to a full scale by the closing signal of a key switch. CONSTITUTION:When a key switch is closed, the output of a timer circuit 18 comes to zero from 1 and a counter 4 is cleared by the signal from a control circuit 7. At the same time, the input of the terminal 6b of a counter 6 comes to 1 and the data for performing the reverse rotary driving of a pulse motor is taken in from initial value memory 17 while a reference pulse signal Pc is outputted from an oscillation circuit 9. On the other hand, the counter 6 is subjected to down-operation because the input of the terminal 6a is zero. A drive circuit 11 reversely rotates the pulse motor 12. During running at a constant speed, a comparator circuit 5 performs discrimination and the input of the reference pulse Pc is stopped. |
