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研究单摆的振动,首先要测定其周期.用秒表来测定它的一个周期,不容易测准.如果将目前中学配备的J0201型或J0201—1型数字计时器的光电门电路作些改进,就可较准确地测定单摆的一个周期,用以研究单摆的振动极为方便.数字计时器的光电门上有一只光敏管和一只发光二极管.当计时器的“功能转换”开关置“S_2”档时,其中任何一只光电门的光敏管被挡光,计时器就开始计时,到再次被挡光计时才停止,计时器记录的是两次
To study the vibration of a pendulum, we must first determine its cycle. Using a stopwatch to measure one cycle, it is not easy to measure. If we improve the photoelectric gate circuits of the J0201 or J0201-type digital timers currently used in middle schools, One cycle of the pendulum can be accurately measured to study the vibration of the pendulum. It is very convenient for the pendulum to have a photocell and a light emitting diode on the photogate of the digital timer. When the timer’s “function switch” switch is set to “ In the case of S_2, the photosensitive tube of any one of the photoelectric gates is blocked and the timer starts timing. It is stopped until it is blocked again. The timer records twice.