一、概述 计数是日常生活和科研、生产中经常遇到的基本测量之一。过去使用的机械式计数器由于机械惰性限制,计数速度不可能很高。电子计数器则是用电子线路完成计数工作的,故其速度大大提高(例如每秒钟计百万个数并不困 First, an overview Counting is one of the basic measurements often encountered in daily life and scientific research and production. Mechanical counters used in the past due to mechanical inertia limit, the counting speed can not be high. Electronic counters are used to complete the electronic circuit count work, so the speed greatly increased (for example, millions of dollars per second is not sleepy