Standard Practice for Estimating and Monitoring the Uncertainty of Test Results of a Test Method Using Control Chart Techniques

Importancia y uso:

4.1 This practice provides one way for a laboratory to develop data-based Type A estimates of uncertainty as referred to in Section A22 in Form and Style for ASTM Standards.

4.2 Laboratories accredited under ISO/IEC 17025 are required to present uncertainty estimates for their test results. This practice provides procedures that use test results to develop uncertainty estimates for an individual laboratory.

4.3 Generally, these test results will be from a single sample of stable and homogeneous material known as a control or check sample.

4.4 The true value of the characteristic(s) of the control sample being measured will ordinarily be unknown. However, this methodology may also be used if the control sample is a reference material, in which case the test method bias may also be estimated and incorporated into the uncertainty estimate. Many test methods do not have true reference materials available to provide traceable chains of uncertainty estimation.

4.5 This practice also allows for ongoing monitoring of the laboratory uncertainty. As estimates of the level of uncertainty change, possibly as contributions to uncertainty are identified and minimized, revision to the laboratory uncertainty will be possible.

Subcomité:

E11.50

Referida por:

D7979-20, E1323-15R20, D7600-16R24, E2655-14R20, E2787-21, D8421-24, C1068-21, D8025-23, E1488-23, E0456-13AR22E01, D7979-20, C1210-21, E2655-14R20, D7599-16R24, E1323-15R20, D7644-23, D8024-23, D8018-15R20, D7466_D7466M-23, D7968-23, E2866-21, D8025-23, E1125-16R20, D7742-17R24, D8535-23, D5994_D5994M-10R21, D7597-16R24, E1488-23, D7858-13R18, E2838-21, E0903-20, D7598-16R24, D7645-23, E0384-22

Volúmen:

14.01

Número ICS:

03.120.10 (Quality management and quality assurance), 19.020 (Test conditions and procedures in general)

Palabras clave:

control chart; control sample; intermediate precision; test result; uncertainty;