基于PAC和LabVIEW的压力变送器高精度动态测试系统研究

Research of High Precision Dynamic Test System Based on PAC and LabVIEW

为了实现压力变送器静态特性和动态特性的高精度测试,设计了一套基于PAC和LabVIEW的智能控制系统。该系统利用伺服泵组产生的高精度压力源施加于被测对象(压力变送器),通过对比校验装置的示值与被测对象的反馈数据,分析校验示值与被测对象反馈结果压力之间的对应关系,从而实现压力变送器的压力自动测试。同时,该系统还可以自动获取压力变送器的灵敏度、线性度、迟滞性、重复性、精度、温度漂移和零点漂移等特性参数。实验结果表明,该系统设计合理,压力测试精度高。

In order to realize the high accuracy test of static and dynamic characteristics of the pressure transmitter,a set of intelligent control system based on PAC and LabVIEW is designed.The system applies the high precision pressure produced by the servo pump group to the pressure transmitter,then compares and analyzes the correspondence between the check value and the feedback result pressure of the test object,so as to realize the automatic pressure test of the pressure transmitter.Meanwhile,the system can automatically obtain the parameters of the pressure transmitter including sensitivity,linearity,lag,repeatability,accuracy,temperature drift,and zero drift.The experimental results show that the system is reasonably designed with high pressure test accuracy.