"基于51单片机的高精度频率测量仪设计"

摘要 频率测量是电子学中最基本的测量之一。频率计由信号输入放大电路、单片机模块、分频模块和显示电路模块组成。本文以AT89C51单片机作为核心，完成待测信号的计数、译码、显示以及分频比控制。通过单片机内部定时/计数器实现待测信号频率的测量，采用外部分频实现10Hz-500kHz的频率测量，并可实现量程自动切换。设计具有高准确度、快速响应和小体积等优点的数字显示频率计。关键词：周期测频法、单片机控制、软硬件结合。 Abstract Frequency measurement is one of the most basic measurements in the field of electronics. A frequency meter consists of signal input amplification circuit, single-chip module, frequency division module, and display circuit module. The AT89C51 single-chip microcontroller is the control core of the frequency meter, used to count, decode, display the measured signals, and control the frequency division ratio. The measurement of the frequency of the signal is achieved using the internal timer/counter of the single-chip microcontroller. In the design process, external frequency division is used to achieve frequency measurement in the range of 10Hz-500kHz, with the capability of automatic range switching. The design utilizes single-chip technology to create a digital frequency meter with high measurement accuracy, fast response time, and compact size. Keywords: periodic frequency measurement method, single-chip control, integration of software and hardware.