GB/T 24635.3-2009 Focus coordinate measurement machine measurement uncertainty determination technology. This part of the standard specializes in the method of applying calibrated workpieces or standard parts. Clarify the implementation process and operation points of the method, specify how to use these calibrated objects, scientifically evaluate the uncertainty of the coordinate measurement machine in actual measurement, provide a standard basis for quantifying measurement errors for the coordinate measurement machine during precision measurement operations, improve the Reliability and accuracy of measurement results, and help various industries to accurately control the dimensional accuracy of products.