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粉末图计时是一种依工频为基准的新颖的计时装置,它具有很多优点,通过对自由落体下落时间的测定了解其特点,在测g值中采用了落球法。一、粉末图计时器原理在通有50Hz微弱交流电的金属板上,撒上升华硫粉末,用手指在板上抹动就会出现计时条纹,每一条纹出现时间为1/100秒。一般情况为硫粉带负电,手指在金属板上抹动的过程中,巧逢50Hz交流电处在正半周时,由于异性相吸,硫粉不被抹掉,留下粉末条纹痕迹。交流电处在负半周时,由于同性相斥,硫粉被抹掉露出金属板,50Hz的周期T=0.02秒,每一条纹出现时间
The powder diagram timing is a novel timing device based on the power frequency. It has many advantages. By knowing the characteristics of the falling time of free fall, the falling ball method is adopted in measuring the value of g. First, the principle of the powder diagram timer In the metal plate with 50Hz weak AC, sprinkle the sulfur powder, wipe with the finger will appear on the board timing stripes, each stripe appears time is 1/100 seconds. In general, the sulfur powder is negatively charged. During the process of wiping the finger on the metal plate, every 50 Hz alternating current is in the positive half cycle. Because the opposite sex attracts, the sulfur powder is not erased, leaving traces of powder streaks. When the AC is in the negative half of the week, due to repulsion of the same sex, the sulfur powder is erased to expose the metal plate. The period of 50Hz is T=0.02 seconds, and the time of each stripe appears.