| 摘要 |
PURPOSE:To enable the rate measurment to be performed easily from outside, by applying a pusle shorter than alarm pulse into the alarm driving coil and detecting the voltage. CONSTITUTION:The output of an oscillating circuit 1 is divided down 2, and is displayed as the time in a liquid crystal panel 5 through a time count circuit 3 and a decoder 4. A buzzer 12 is driven at a specified time through alarm signal forming circuit 6, control circuits 7, 8, alarm time memory circuit 9, alarm coincidence circuit 10, buzzer driving circuit 11, etc. On the other hand, the divided output is supplied into a rate measuring waveform forming circuit 13, and the rate measuring pulse of the output thereof is fed into the driving circuit 11. This pulse has a very short time width as compared with the alarm pulse. Hence, by detecting the voltage of the driving coil induced by this pulse, the rate may be measured. |
