ISO 4259-3 pdf free download
ISO 4259-3-2020 pdf free download.Petroleum and related products – Precision of measurement methods and results一 Part 3: Monitoring and verification of published precision data in relation to methods of test.
This document specifies the methodology for the regular monitoring of the test method precision achieved versus the precision published in the standard test method using data from proficiency testing schemes (PTSs) supported by the regular users of standard test methods.
The procedures in this document are designed specifically for proficiency testing (PT) conducted on standard test methods, having a published reproducibility, for petroleum and petroleum-related products, which are presumed to be homogeneous, and where the data distribution is approximately normal. In addition, it is applicable to properties of interest that are (known to be) stable over time and transport.
This document specifies the methodology for the statistical comparison of standard deviation under reproducibility conditions achieved in PT programmes versus that published.
The purpose of this comparison is to find out if the published reproducibility precision is representative of that achievable by the regular participants in the PT programmes.
This document also provides guidance on how to use a PT z-score to monitor an individual participant’s performance over time (see Annex B).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 4259-1, Petroleum and related products — Precision of measurement methods and results — Part 1:
Determination of precision data in relation to methods of test
ISO 13528:2015, Statistical methods for use in proficiency testing by interlaboratory comparison ISO/IEC 17043, Conformity assessment — General requirements for proficiency testing
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4259-1, ISO 13528, ISO/IEC 17043 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1 proficiency testing PT
evaluation of participant performance against pre-established criteria by means of interlaboratory
comparisons
3.2 proficiency testing scheme PTS
programme designed for the periodic evaluation of participating laboratories’ proficiency in the execution of a standard test method through the statistical analysis of their test results obtained on aliquots prepared from a single batch of homogeneous material
Note ito entry: The frequency of such testing varies in accordance with the scheme objective. Each execution of testing Involves testing of a single batch of material. Materials typically vary from test to test.
Note 2 to entry: This Is also commonly relerred to as the Inter Laboratory Cross Check Programm&’.
4 Proficiency testing scheme requirement
4.1 PTS provider
The PTS provider shall conform to the technical and management requirements as outlined in ISO/IEC 17043.ISO 4259-3 pdf download.
