NOTE A4.1—These calculations are based on Practice D6617.
A4.1 Determine the standard deviation for site uncertainty, σsite, from a laboratory quality control program. (See Practice D6299.)
A4.1.1 If the standard deviation for site uncertainty, σsite, is not known, use the value 0.19 %.
A4.2 Determine the combined extended uncertainty (CEU) of the accepted reference value (ARV) of the certified reference material (CRM) from the supplier’s label or included documentation. In this test method, the CRM is the Certified Viscosity Reference Standard (CVRS) as defined in 9.2.
NOTE A4.2—Combined Extended Uncertainty (CEU) is equivalent to Expanded Uncertainty (U). See NIST Technical Note 1297.