基于LabVIEW的电子频率计设计

Design of Electronic Cymometer Based on LabVIEW

针对传统频率计存在的测试精度偏低、误差偏高等诸多缺陷,提出了一种基于Lab VIEW的虚拟电子频率计设计方案.在分析测频、测周原理的基础上,设计了虚拟电子频率计手动、自动测试硬件系统;建立了底层驱动函数动态链接库;完成了测试测量系统控制与显示功能面板,以及程序框图设计.设计的系统具有5档闸门时间调节,5档周期倍乘切换,5种时标信号选取,以及自动选择测量等功能.实验测试数据表明,虚拟电子频率计较传统电子频率计有精度高、误差小和通用性好等优势,具有一定的应用及推广价值.

Because of the low accuracy and high error rate of the traditional cymometer,the design scheme of virtual electronic cymometer based on Lab VIEW is proposed. The hardware system of the virtual electronic cymometer is designed based on the principle of the frequency or periodic measurement. Furthermore,the dynamic link library of the underlying driver function is established. The control and display function panel of the test system is completed,and the program block diagram is also designed. This system has many kinds of function,such as 5 gate time adjustment,5 cycle times switching,5 time signal selection,and so on. The measured data shows that the virtual electronic cymometer has the advantages of higher accuracy,lower error rate and better generality compared with the traditional electronic cymometer. The virtual electronic cymometer has a certain application and popularization value.