测量不确定度培训英文版.pdf

Measurement of
Uncertaint
Nov.2008
Rina Feng
l> Definition: Measurement uncertainty
A parameter associated with the result of a
measurement, that characterises the dispersion E
of the values that could reasonably be attributed E
to the measurand
Main Reference
Reference
VAM Proiect 3.2.1
Development and Harmonisation of Measurement Uncertainty
Principles
Part(d): Protocol for uncertainty evaluation from validation data
January 2000
LGC/VAM/1998/088
contract with the Department of Trade and Industry as part of the
National Measurement Systems Valid Analytical Measurement
(VAM)Programme
Other References
ILAC Guide 17
Introducing the Concept of Uncertainty in Testing in
illini willl I
Association With the Application
of the Standard ISO/EC 17025(2002)
www.llac.org
n.u11:1
EA Guide 4/16
EA guidelines on the expression of uncertainty in
quantitative testing(12/2003)
www.european-accreditation.com
EURACHEM/CTAC Guide CG 4
EURACHEM/CITAC Guide CG d
Quantifying Uncertainty in Analytical Measurement(2000)
Quantifying Uncertainty in
Analytical Measurement
wwweurachem.com
Difference between error uncertainty
Error
Difference between an individual result
and the true value of the measurand
Error is a single value
Applicaiton: a correction to the result
Uncertainty
Applies to all the determinations a range
Cannot be used to correct a measurement
result