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在零流量条件下,当超声水表输出值中含有显著漂移特性时,其小流量测量段的示值误差就会出现较大的不确定性,严重时会影响该流量段水表测量结果的准确度。通过分析漂移产生原因、采取有效技术手段、在出厂检验中设置辅助测量项目等措施来及时发现并基本消除隐含在水表计量特性中的漂移因素,可以大大降低超声水表测量值随时间发生变化的程度。
Under the condition of zero flow, when the output value of the ultrasonic water meter contains significant drift characteristics, the indication error of the small flow measurement section will be greatly uncertain, which will affect the accuracy of the measurement results . By analyzing the causes of drift, adopting effective technical means, setting up auxiliary measurement items in factory inspection and other measures to find out and basically eliminate the drift factors implicit in the metrological characteristics of water meters, the measurement values of ultrasonic water meters can be greatly reduced with time degree.