Calculate the standard error of the accepted reference
value (SEARV) by dividing the CEU by the coverage factor, k,
listed on the supplier’s label or included documentation.
SEARV 5 CEUARV
k (A4.1)
NOTE A4.3—Standard Error (SEARV) is equivalent to Combined Standard Uncertainty (UC). See NIST Technical Note 1297.
A4.3.1 If the coverage factor, k, is not known, use the value
2.
A4.4 Construct the acceptable tolerance zone:
TZ 5 61.44 =σsite
2 1SEARV
2 (A4.2)
A4.5 Worked out example for kinematic viscosity zone
(band):
σsite 5 0.19 % ~default value from A4.1.1! (A4.3)
CEUARV 5 0.22 % ~from the CVRS label or documentation!