【摘要】 设计了一套基于虚拟仪器软件LabVIEW的ESCORT-3146A台式数字万用表多功能测量系统。该系统中3146A台式数字万用表与计算机的通讯功能是利用LabVIEW中的串口通讯函数与子VI进行开发的,采用USB串口线实现计算机USB端口与3146A台式数字万用表RS232端口的物理连接。在集成3146A台式数字万用表前面板测量功能的基础上,测量系统增加了图形化显示测量数据,采样周期自由设定,海量数据存储等功能。利用3146A台式数字万用表四线制测量电阻的功能,该测量系统还可以配合PT100进行精密测温,测量范围为0~200℃,测温精度达到0.023℃。更多还原

【Abstract】 By using the virtual instrument software LabVIEW,a multi-functional measurment system was designed based on ESCORT-3146 A bench-type digital multimeter( DMM). The function of communication between PC and 3146 A DMM was achieved by LabVIEW’s serial communication functions and sub VI. Physical connections between USB port of PC and RS232 port of 3146 A DMM were realized with USB serial port line. On the basis of the integration of the front panel measuring functions of 3146 A DMM,the additional functions were added to the measurement system,such as graphical displaying of measurement data,sampling period setting,massive data storage. Using the four-wire method of resistance measurement,this measurement system could coordinate with PT100 for precise temperature measurement,with measurement range of 0-200℃ and temperature measurement precision reached 0. 023℃.更多还原