电子秒表和机械秒表,作为一种特殊类型的时间间隔测量仪,其测量时间间隔的启停受控于其外壳上的开始/停止按钮。因此,对于电子秒表和机械秒表来说,无法直接将标准时间间隔信号(启停控制信号)接入。为了减少人为误差(一般人的反应速度为0.2s～ Electronic stopwatch and mechanical stopwatch, as a special type of time-lapse meter whose start and stop of measurement intervals are controlled by the start / stop button on their housing. As a result, standard time interval signals (start-stop control signals) can not be accessed directly for electronic stopwatches and mechanical stopwatches. In order to reduce human error (most people’s reaction rate of 0.2s ~