| 摘要 |
PURPOSE:To stop surely a sweep, by stopping the sweep when a sweep stopping signal is detected once and completing the sweep if the sweep stop signal comes again after a prescribed time. CONSTITUTION:When a pulse signal 202 outputted from a counter 12 comes during the period of the sweep stopping signal 203, an AND circuit 41 outputs a signal 204 having a pulse in the same timing as that of the pulse from the counter 12. A one-shot multivibrator 42 outputs a pulse 205 of a time constant T1. This pulse is inverted by an inverter 43, a one-shot multivibrator 44 inputs this inverting signal, detects the fall of the pulse signal 205 and then rises, and outputs a pulse signal 206 having a time constant T2. The presence and absence of the sweep stopping signal 203 is discriminated again in the time T2. |
