流量计的检定主要包括对其计量性能的要求、通用技术要求及计量器具控制等内容。由于流量计的形式各异、原理不同,检定方法也各不相同,所以下面简述对流量计检定的一般要求及检定方法。一、流量计检定的一般要求(一)对流量标准装置的要求1.流量标准装置(以下统称“装置”)和几何检验法所用的量具及仪器等应有有效的检定证书。2.装置的扩展不确定度应不大于被检流量计最大允许误差绝对值的1/2或1/3。3.装置应保证在流量计上、下游侧有足够长的直 The verification of the flowmeter mainly includes the requirements of its metrological performance, general technical requirements and control of measuring instruments. Due to the different forms of the flowmeter, the principle is different, the verification method is also different, so the following general description of the flowmeter verification and verification methods. First, the general requirements of the flowmeter test (A) of the requirements of the flow standard device 1 flow standard device (hereinafter referred to as “device”) and the geometric test method used measuring instruments should have a valid test certificate. 2. The expansion uncertainty of the device shall not be greater than 1/2 of the absolute value of the maximum permissible error of the flowmeter under test or 1 / 3.3. The device shall ensure that the downstream side of the flowmeter has a long enough straight