具有电流输出功能的流量计的检定,由于采样电路的自身缺陷,电流采样过程中不可避免会引入采样误差,而采样误差的大小直接影响流量计检定的准确度。一、装置的结构和工作原理按计量标准器不同,流量标准装置分为称重法、容积法和标准表法3种,按试验介质不同,流量标准装置分为液体和气体两类。如图1所示,标准表法液体流量标准装置主要包括水泵、稳压罐、开关阀、电磁流量计、管线、计算机控制系统,其中电磁流量计作为标准表是标准表法液体流 Flowmeter with current output verification, due to the sampling circuit of its own shortcomings, the current sampling process will inevitably lead to sampling errors, and the size of the sampling error directly affect the accuracy of flowmeter verification. First, the device structure and working principle According to the different standards, flow standard device is divided into weighing method, volumetric method and standard table method 3, according to different test medium, flow standard device is divided into two types of liquids and gases. As shown in Fig. 1, the standard liquid flow rate standard device mainly includes water pump, surge tank, on-off valve, electromagnetic flowmeter, pipeline and computer control system. Electromagnetic flowmeter as a standard meter is a standard liquid flow meter