ILAC P10:01/2013
ILAC Policy on the Traceability
of Measurement Results
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TABLE OF CONTENTS
PREAMBLE (4)
PURPOSE (4)
AUTHORSHIP (4)
1. Terms and Definitions (5)
2.ILAC Policy for Traceability Covered by the ILAC Arrangement in Calibration (5)
3. ILAC Policy for Traceability Covered by the ILAC Arrangement in Testing (7)
4. ILAC Policy for Traceability Provided through Reference Materials (RMs) and Certified
Reference Materials (CRMs) (8)
5. References (9)
ANNEX A (10)
PREAMBLE
To ensure confidence in the results of accredited laboratories, accreditation bodies implement ILAC policies and u guidance documents to assist in the uniform and harmonid approach of accreditation criteria. Metrological traceability of measurement results is a key topic for which a harmonid policy is needed if the market is to have confidence in calibrations, testing and inspections performed by accredited laboratories and inspection bodies covered by the ILAC Arrangement. Metrological traceability requires an unbroken chain of calibrations to stated references, all having stated uncertainties – refer VIM [1]. The persistent misconception that metrological traceability may be linked to a particular organization (e.g., “traceable to a specific Natio
nal Metrology Institute”) fosters continued confusion with regard to its nature. Metrological traceability pertains to reference quantity values of measurement standards and results, not the organization providing the results.
Factors that influence the establishment of a harmonid ILAC policy on metrological traceability of measurement results include the following:
(a) The concept of metrological traceability of measurement results in fields such as the chemical, medical, and biological sciences is still under development;
(b) Not all economies have the complete range of national measurement standards or calibration and measurement capabilities needed to support the calibration and testing needs of all applicants for accreditation in their economy;
(c) The role of reliable and traceable certified reference materials in providing metrological traceability of measurement results has not yet been fully established internationally.
PURPOSE
This document describes the ILAC policy with regard to the metrological traceability requirements fro
m ISO/IEC 17025:2005 [2] and ISO 15189:2007 [3]. This policy may also be applied to other conformity asssment activities where testing and/or calibration is involved (e.g., inspection and product certification). For calibrations performed by a laboratory in order to establish metrological traceability for its own activities, and which are not a part of the laboratory’s scope of accreditation, the ILAC policy in ction 2 is applicable. Internal calibrations are also known as “In-hou” calibrations.
The date of implementation is January 2014.
AUTHORSHIP
This version was reviewed by the ILAC Accreditation Committee (AIC) and endord for publication by the ILAC General Asmbly in 2013.
1. TERMS AND DEFINITIONS
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The following definitions apply throughout this document:
朝梁暮陈Metrological traceability (VIM 3 clau 2.41)
Property of a measurement result whereby the result can be related to a reference through a
documented unbroken chain of calibrations, each contributing to the measurement uncertainty.
Note 1 clau 2.41 states that a ‘reference’ can be a “definition of a measurement unit through its practical realization, or a measurement procedure including the measurement unit for a
non-ordinal quantity, or a measurement standard.”
In ISO/IEC 17025:2005 and ISO 15189:2007 the term “traceability” is equivalent to the
马桶渗水VIM’s “Metrological traceability” and the term “traceability” is ud throughout this
document.
洗衣机洗衣服Metrological traceability chain (VIM 3 clau 2.42)
Sequence of measurement standards and calibrations that is ud to relate a measurement
result to a reference
Metrological traceability to a measurement unit (VIM 3 clau 2.43)
Metrological traceability where the reference is the definition of a measurement unit through its practical realization
Note1: The expression “traceability to the SI” means metrological traceability to a
measurement unit of the International System of Units.
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NMI
National Metrology Institutes (NMI) and Designated Institutes (DI) maintain standards in
countries (or regions) all over the world. Throughout this document, the term “NMI” is ud to cover both National Metrology Institutes as well as Designated Institutes.
JCTLM
The CIPM, IFCC and ILAC Joint Committee for Traceability in Laboratory Medicine
2. ILAC POLICY FOR TRACEABILITY COVERED BY THE ILAC ARRANGEMENT
IN CALIBRATION
The general requirement for traceability in ISO/IEC 17025:2005 is:
5.6.1 A ll equipment ud for tests and/or calibrations, including equipment for
subsidiary measurements (e.g. for environmental conditions) having a significant幼儿园主题课程
effect on the accuracy or validity of the result of the test, calibration or sampling shall
be calibrated before being put into rvice.
It is an obligation of the laboratory to justify the need for calibration. In ISO/IEC 17025:2005, the further traceability requirement for calibration laboratories is:
5.6.2.1.1 For calibration laboratories, the programme for calibration of equipment
shall be designed and operated so as to ensure that calibrations and measurements
made by the laboratory are traceable to the International System of Units (SI)
(Système international d'unités).
