ILAC Policy for
帝王石Uncertainty in Calibration ILAC-P14:11/2010
© Copyright ILAC 2010
ILAC encourages the authorized reproduction of this publication, or parts thereof, by organisations wishing to u such material for areas related to education, standardisation, accreditation, good conformity asssment practice or other purpos relevant to ILAC’s area of experti or endeavour.
Organisations eking permission to reproduce material from this publication must contact the ILAC Secretariat in writing or via electronic means such as email.
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1)the part thereof, for which permission is sought;
2)where the reproduced material will appear and what it will be ud for;
3)whether the document containing the material will be distributed commercially, where it
will be distributed or sold, and what quantities will be involved;
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4)any other background information that may assist ILAC to grant permission.
ILAC rerves the right to refu permission without disclosing the reasons for such refusal.
The document in which the reproduced material appears must contain a statement acknowledging the ILAC contribution to the document.
Permission to reproduce this material only extends as far as detailed in the original request. Any variation to the stated u of the material must be notified in advance in writing for additional permission.
ILAC shall not be held liable for any u of its material in another document.
Any breach of the above permission to reproduce or any unauthorized u of this material is strictly prohibited and may result in legal action.
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TABLE OF CONTENTS南亚高压
PREAMBLE (4)
PURPOSE (4)
AUTHORSHIP (4)
PROCEDURE (5)
1.Introduction (5)
民生的重要性2.Scope (5)
纸板手工制作3.Terms and Definitions (5)
4.ILAC Policy on the Estimation of Uncertainty of Measurement (6)
5.ILAC Policy on Scopes of Accreditation of Calibration Laboratories (6)贵州高考分数线
6.ILAC Policy on Statement of Uncertainty of Measurement on Calibration
Certificates (8)
7.References (9)
8.Example of guidance documents (9)
ANNEX (11)
PREAMBLE
In order to enhance the harmonisation in the expression of uncertainty of measurement on calibration certificates and on scopes of accreditation of calibration laboratories, ILAC approved a resolution at its third General Asmbly meeting in Rio de Janeiro in 1999 that ILAC will develop crit
eria for the determination of uncertainty of measurement (e below)*. Since then ILAC members have implemented documents on uncertainty of measurement bad on the “Guide to the Expression of Uncertainty of Measurement” (GUM). ILAC and the BIPM have signed a Memorandum of Understanding (MOU) and issued Joint Declarations aiming at cooperation on various issues. In recent years ILAC and the BIPM have agreed to harmoni the terminology, namely the “Best Measurement Capability (BMC)” ud on scopes of accreditation of calibration laboratories with the “Calibration and Measurement Capability (CMC)” of the Appendix C of the CIPM MRA .
This policy document address the estimation of uncertainty of measurement and its expression on calibration certificates of accredited laboratories and the evaluation of the CMC on the scopes of accreditation in line with the principles agreed upon between ILAC and the BIPM (e annex).
*3.7.6 ILAC Arrangement Signatories shall have and implement criteria for the determination of uncertainty of measurements in calibration by June 2000. The signatories shall demonstrate that such documents are equivalent to the GUM Guide. The document EAL-R2 “Expression of the Uncertainty of Measurements in Calibration” [1] will be ud as the measuring stick for such documents as a temporary measure pending the development of an ILAC document.
PURPOSE
This policy ts out the requirements and guidelines for the estimation and statement of uncertainty in calibration and measurement, which apply to accreditation bodies and their accredited laboratories and reference material producers that perform calibration and measurement, in order to ensure a harmonid interpretation of the GUM and the consistent u of CMC by ILAC member bodies to strengthen the credibility of ILAC Arrangement.
AUTHORSHIP
This procedure was prepared by the ILAC Accreditation Issues Committee (AIC) and endord by the ILAC membership.
PROCEDURE
1.Introduction快活的意思
ISO/IEC 17025 requires calibration laboratories and testing laboratories to have and apply
procedures for the estimation of uncertainty of measurement.
ISO 15195 [2] and ISO Guide 34 [3] have similar requirements for reference measurement
laboratories and reference material producers.
Specific advice on the evaluation of uncertainty can be found in the “Guide to the Expression of Uncertainty in Measurement” (GUM), first published in 1993 in the name of BIPM, IEC, IFCC, ISO, IUPAC, IUPAP and OIML [4][8]. The GUM establishes general rules for
evaluating and expressing uncertainty in measurement that can be followed in most fields of physical measurements. The GUM describes an unambiguous and harmonid way of
evaluating and stating the uncertainty of measurement and provides veral options to
estimate and state uncertainty of measurement. Similarly, ISO Guide 35 [5] provides specific advice on determining the contributions to uncertainty from reference materials, including
instability, inhomogeneity, and sample size, but veral options are allowed. This may result in various interpretations of the GUM and ISO Guide 35, and hence calibration/reference
measurement laboratories and reference material producers accredited by ILAC member
bodies may report uncertainty of measurement in an inconsistent way. For this reason, many accreditation bodies, as well as regional co-operations, have published mandatory criteria
documents and guidance on uncertainty of measurement, in line with the GUM and ISO
Guide 35, to help laboratories implement the criteria and guidance. Some examples of
guidance documents are listed in Section 8 of this Policy.
2.Scope
This document ts forth the ILAC policy regarding the requirements for the evaluation of the uncertainty of measurement in calibration and measurement, evaluation of the calibration and measurement capability (CMC), and the reporting of uncertainty on the certificates of
calibration and measurement.
This document is applicable to calibration laboratories, reference measurement laboratories
for laboratory medicine, and producers of certified reference materials that provide
calibration and measurement rvices that refer to their accredited status under the ILAC
MRA.
Relevant ctions of this policy may also be applicable to testing laboratories that perform
their own calibrations.
3.Terms and Definitions
For the purpo of this document, the relevant terms and definitions given in the
新学期班会ppt“International Vocabulary of Metrology – Basic and General Concepts and Associated
Terms” (VIM) [6][9] and the following apply:
Laboratory
3.1 Calibration
In this policy, "calibration laboratory" further means a laboratory that provides
calibration and measurement rvices.
