毕业设计（文）-等精度测频法的频率计设计.doc

西安交通大学城市学院本科生毕业设计（论文）摘要PAGE PAGE IVPAGE IIIPAGE III 摘 要 频率测量是电子学测量中最为基本的测量之一。频率计主要是由信号输入和放大电路、单片机模块、分频模块及显示电路模块组成。AT89C52单片机是频率计的控制核心，来完成它待测信号的计数，译码，显示以及对分频比的控制。利用它内部的定时/计数器完成待测信号频率的测量。在整个设计过程中，所制作的频率计采用外部分频，实现1Hz-1kHz的频率测量及1ms-100ms的脉宽测量，而且可以实现量程自动切换流程。以AT89C52单片机为核心，通过单片机内部定时/计数器的门控时间，方便对频率计的测量。其待测频率值使用LCD液晶显示器显示，并可以自动切换量程。本次采用单片机技术设计一种数字显示的频率计，具有测量准确度高，响应速度快，体积小等优点。关键词：频率计,单片机,LCD液晶显示器。ABSTRACTABSTRACTFrequency measurement is one of the most basic measurement electronics measurement. Frequency counter is dominated by the signal input and the amplifier circuit, microcontroller module, frequency module and the display circuit module. AT89C52 microcontroller is to control the core frequency meter to complete its measured signal counting, decoding, display and control divider ratio. Use its internal timer / counter to complete the test signal frequency measurements. Throughout the design process, by making use of external parts of the frequency meter frequency to achieve frequency measurement and pulse width measurement 1ms-100ms of 1Hz-1kHz, and can realize automatic range switching processes. To AT89C52 microcontroller as the core, through the internal microcontroller timer / counter gate time, easy measurement of the frequency meter. Its measured frequency value using the LCD display, and can automatically switch range. The use of microcomputer technology to design a digital display of frequency meter, have a measurement of high accuracy, fast response, small size and so on.KEYWORDS: Frequency meter, S