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流量计检定(或校准)时,脉冲采样误差的大小直接影响流量计的准确度等级。根据装置脉冲采样的原理,可以发现脉冲采样误差主要来自于换向器的换向时间误差和计数器的计数误差。1.换向器换向时间误差分析换向器利用机械部件改变介质流动方向,同时提供反馈信号,让采集系统对流量计检定准确计时。该装置采用开式换向器,通过行程差法检定,其A类标准不确定度:0.0069%、0.0023%,B类标准不确定度0.0036%,其合成标准不确定度为0.0081%,可见换向
Flowmeter calibration (or calibration), the size of the pulse sampling error directly affects the flowmeter accuracy level. According to the pulse sampling principle of the device, it can be found that the pulse sampling error mainly comes from the commutator’s commutation time error and the counter’s counting error. 1. Commutator commutation time error analysis Commutator use of mechanical parts to change the flow direction of the medium, while providing feedback signal, the acquisition system to check the accuracy of timing meter. The device adopts an open commutator and is tested by the travel difference method. The standard uncertainty of category A is 0.0069% and 0.0023%, the standard uncertainty of category B is 0.0036% and the synthetic standard uncertainty is 0.0081% to