| 摘要 |
PURPOSE:To set the delay time of a delaying circuit in a quick and accurate way, by giving a loop oscillation with feedback to the output of a delaying circuit to which the delay time is set and measuring the cycle of the loop oscillation. CONSTITUTION:Switching circuits 8 and 6 perform switching for the area between an input terminal 4 and an output terminal 5 from the 2nd closed loop comprising the circuit 8, a delaying circuit 7, the circuit 6, an OR gate 11 and a monostable multivibrator 9 to the 1st closed loop in which the circuit 7 of the 2nd closed loop is by-passed. The oscillating cycle T1 of the 1st closed loop is counted by a counter 14 and by the pulse of the vibrator 9. The difference between the cycle T1 and the oscillating cycle T2 of the 2nd closed loop which is counted in the same way is compared with the delay time T3 to be set. To set this difference at zero, a control means 17 of the circuit 7 is controlled. In such a way, the delay time can be set in a quick and accurate way. |
