基于改进型等精度测量的可视化频率仪  

Visual Frequency Meter Based on FPGA

作　　者：谭本艳 夏界宁[1,2] TAN Benyan;XIA Jiening

机构地区：[1]中国地震局地震研究所 [2]武汉地震科学仪器研究院有限公司

出　　处：《计量与测试技术》2023年第3期51-53,共3页Metrology & Measurement Technique

摘　　要：通过比较直接测频法、测周期测频法和等精度测频法,在确定等精度测频法不受被测信号计数影响的前提下,提出一种同时记录标准时钟上升沿和下降沿的改进型等精度测频法。与传统的等精度测频法相比,将±1个计数误差减小为±0.5个计数误差。采用FPGA进行验证,并扩展PC机上显示频率读数和波形可视化功能。By comparing the direct frequency measurement method,the periodic frequency measurement method and the equal precision frequency measurement method,and on the premise of ensuring that the equal precision frequency measurement method is not affected by the measured signal count,an improved equal precision frequency measurement method which records the rising edge and falling edge of the standard clock at the same time is proposed.Compared with the traditional equal precision frequency measurement method,the counting error of ±1 is reduced to ±0.5.FPGA is used for verification,and the function of display frequency reading and waveform visualization on PC is extended.

关 键 词：改进的等精度测频 计数器 虚拟示波器 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]