Evaluation of measurement uncertainty for gas flow circular venturi tubes stamdard device

For all kinds of flowmeter,it is necessary to research on their characteristics from development to application.All the tests are performed on flowmeter standard device.Since measurement uncertainty affect test results a lot,the uncertainty evaluation is rather important.Taking Gas Flow Circular Venturi Tubes Standard Device as example,this paper introduced verification and calibration methods as well as measurement uncertainty evaluation of test results.