此类计数器设计方便，电路简单，译码电路简单，并具有快速自启动特。
These counters have many advantages: easy to design, simple circuit, simple decode and self starting.
本文介绍了一种同步测周期计数器的设计，并基于该计数器设计了一个高精度的数字频率计。
The design of a counter measuring synchronous period is introduced in this paper. And based on it, a high precision digital cymometer is designed.
介绍了一种光学颗粒计数器设计技术的理论和方法，并研制了一套用于颗粒计数的实验装置。
The particle count technology based on light scattering at different collecting angles is introduced and device is constructed.
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