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Director of NIST (1994), Dr. John W. Lyons, wrote, “ It is generally agreed that the usefulness of measurement results ….is to a large extent determined by the quality of the statements of uncertainty that accompany them.” (From Technical Note 1297; 1994 ). GDC: data point.

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Presentation Transcript
slide1

Director of NIST (1994), Dr. John W. Lyons, wrote,

“It is generally agreed that the usefulness of measurement results ….is to a large extent determined by the quality of the statements of uncertainty that accompany them.”

(From Technical Note 1297; 1994)

slide2

GDC: data point

Data point

Expanded uncertainty

Properties

Expanded combined uncertainty

State variables

Expanded uncertainty

slide3

Derivation of combined uncertainty

Data point

Expanded uncertainty of property

Expanded combined uncertainty

Derivatives by

state variables

Expanded uncertainties of state

variables

slide4

Sources of information

CalcUncertainty function

Repeatability

Device specification

Calibration/Comparison

Method/Device

Method specifications

Uncertainty

Scattering/deviations

Expert judgment

(quality factor)

GDC software

Literature source

TRC