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“打点计时器”是高中力学实验中非常重要的基本仪器.测速度、加速度等物理量时,通常是小车连着纸带,纸带穿过打点计时器,用纸带上的点来记录小车的运动情况.实验装置非常简洁、直观,便于学生理解.但在实际操作中,最为突出的问题有两个,一是小车到达长木板的末端不能停下,甚至跌落到地面上;二是学生不能及时关闭电源,导致打点计时器长时间工作,影响打点计时器的使用寿命.
“RBI timer ” is a very important basic instrument in high school mechanics experiment.When measuring the physical quantity such as velocity and acceleration, the car is usually connected with the paper tape, the paper tape passes through the RBI timer and the dots on the paper tape are used to record The movement of the car.Experimental device is very simple and intuitive, easy for students to understand.But in practice, the two most prominent problems, first, the car can reach the end of the long wooden board can not stop, or even dropped to the ground; the second is Students can not turn off the power in a timely manner, resulting in RBI timer work for a long time, affecting RBI timer service life.