电子秒表具有计时精确度高,使用方便等优点,在物理实验中广为应用。但在测量过程中人为产生的误差还是比较大的。主要原因在于难以把握计时的时刻。为了减小人为产生偶然误差。给电子秒表配上一个自动控制电路,这样就把一个普通电子秒表,改制成一个自动计时器。多年教学中使用,其计时效果较好。现介绍如下。 Electronic stopwatch with timing accuracy, ease of use, etc., widely used in physics experiments. However, in the measurement process of human error is still relatively large. The main reason is that it is difficult to grasp the timing of timing. In order to reduce the human accidental error. To the electronic stopwatch coupled with an automatic control circuit, so put an ordinary electronic stopwatch, converted into an automatic timer. Used for many years of teaching, the timing effect is better. Now introduced as follows.