基于LabVIEW的虚拟直流电压表设计

Virtual DC voltmeter design based on LabVIEW

借助虚拟仪器LabVIEW软件,以计算机丰富的软硬件为平台,设计了数据采集电路,其中主要包括A/D转换模块、增益选择模块及通道输入模块;利用LabWindows/CVI和Visual C++软件开发了底层功能函数和DLL动态链接库,通过在LabVIEW中的调用库函数,实现启动、选择、测量和显示等功能,最终完成了一种新型的数字式直流电压表设计。实验测试表明,设计开发的虚拟直流电压表具有测试方便、测量精度高、相对误差小等优势,市场应用前景广阔。

By use of virtual instruments LabVIEW software,and rich software and hardware of computer as a platform,the data acquisition circuit is designed,which includes A/D converter module,selection module and channel gain input module.The underlying performance functions and DLL dynamic link library are developed by using LabWindows/CVI and Visual C＋＋ software.In order to achieve starting,selecting,measuring,and other display functions,a new type of digital DC voltmeter design is completed finally by calling the library functions in LabVIEW.Experimental tests showed that the design and development of virtual DC voltmeter has convenient test,high accuracy,small relative error and other advantages.Thus the market prospect is broad.