Regulations On Metrological Traceability For Testing Laboratories That Using AOSC Accreditation Services

Regulations On Metrological Traceability For Testing Laboratories That Using AOSC Accreditation Services
    With reference to ILAC-P10 ILAC Policy on Traceability of Measurement Results, AOSC issued the Regulations on metrological traceability for testing laboratories to describe its the requirements related to measurement traceability. This document is intended for all AOSC accredited testing laboratories and calibration laboratories (refer to as ‘laboratories’ in this document).
Calibration is the operation that, under specified conditions, in the first step, establishes a relation between the quantity values with measurement uncertainties provided by measurement standards and corresponding indications with associated measurement uncertainties and, in the second step, uses this information to establish a relation for obtaining a measurement result from an indication.
Metrological traceability is the 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.
Metrological traceability chain is the sequence of measurement standards and calibrations that is used to relate a measurement result to a reference.
Metrological traceability to a measurement unit is the metrological traceability where the reference is the definition of a measurement unit through its practical realization.
 
     According to GR-14, AOSC requires that all calibrations of measuring and test equipment and reference standards to be conducted by:
        - A calibration laboratory accredited to ISO/IEC 17025 by an accreditation body mutually recognized by ILAC (International Laboratory Accreditation Cooperation), Asia Pacific Laboratory Accreditation Cooperation (APLAC); or
        - A recognized National Metrology Institute (NMI) including designated institutes that is suitable for the intended need and is a signatory to the CIPM (Comité International des Poids et Mesures) MRA (Mutual Recognition Arrangement). Services covered by the CIPM MRA can be viewed in the BIPM KCDB which includes the range and uncertainty for each listed service; or
       - A laboratory that is accredited to ISO/IEC 17025 by AOSC (the scope of accreditation does not include in-house calibration methods) found to meet the clause 4.4 requirements of this document for their in-house calibrations.
 
     Where traceability of measurements to SI units is not possible and/or not relevant, laboratory shall provide confidence in measurements by establishing traceability to appropriate measurement standards such as:
         - The use of certified reference materials provided by a competent supplier to give a reliable physical or chemical characterization of a material;
          - The use of specified methods and/or consensus standards that are clearly described and agreed by all parties concerned.
           - Participation in a suitable programme of interlaboratory comparisons is required where possible.
 
       Certified Reference Materials which are used for traceability shall have:
      - The values assigned to CRMs produced by an accredited RMP under its accredited scope of accreditation to ISO 17034 by an accreditation body mutually recognized by ILAC (International Laboratory Accreditation Cooperation), Asia Pacific Laboratory Accreditation Cooperation (APLAC), are considered to have established valid traceability; or
           - The values assigned to CRMs produced by National Metrology Institute (NMI) and included in the BIPM KCDB; or
         - The values assigned to CRMs covered by entries in the JCTLM database are considered to have established valid traceability; or
           - The majority of RMs and CRMs are produced by other RMPs. These can be considered as critical consumables and the laboratory shall demonstrate that each RM or CRM is suitable for its intended use.
 
       In-house calibrations
       Laboratories that perform in-house calibration shall have appropriate technical capability in calibration.
      
The laboratory shall keep evidence of in-house calibration capabilities. These evidences must include but are not limited to the following:

  a. Establish and maintain documented procedures for in-house calibration including estimation of measurement uncertainty;
     b. Documentation of calibration method with its validation of method records;
    c. Documentation for competence of staff that performing in-house calibration. For example: records of training and assessment of staff performance for a method;
     d. Documentation for traceability of measurements;
     e. Documentation for facility and environmental conditions;
     f. Documentation for assuring the quality of in-house calibration results;
     g. Records of assessment and internal audit of in-house calibration for laboratory;
     h. Suitable method of recording the calibration and measurement data.
         AOSC will assess the competence of in-house calibration of laboratory based on the above requirements during assessment.
 
         Please refer to GR-14 in VLAT Document on AOSC website for more information.

Source: AOSC

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