GB/T 6683.3-2023Petroleum and related products - Precision of measurement methods and results - Part 3: Monitoring and verification of published precision data in relation to methods of test (English PDF)

1 Scope

This document describes how the precision values achieved by routinely monitored test methods are compared with the published precision values in the test method standards:

method, using data from a proficiency testing procedure involving routine users of the method standard:

This document is applicable to proficiency testing procedures based on standard test methods for (considered) homogeneous petroleum and related products:

, and the data are approximately normally distributed: This document applies only to (considered) long-term and transport-stable samples:

This document presents a method for comparing the standard deviation obtained by proficiency testing procedures with published values under reproducibility conditions:

The significance of this comparison is to determine whether the published reproducibility precision represents the realistic value obtained by everyday participants of the proficiency testing procedure:

Appendix A gives guidance for monitoring long-term performance of individual participants using proficiency testing procedure z-scores:

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references

For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document:

GB/T 6683:1 Petroleum and related products Measurement methods and precision of results - Part 1: Test method precision data accuracy (GB/T 6683:1-2021, ISO 4259-1:2017, MOD)

GB/T 27043 General requirements for proficiency testing for conformity assessment (GB/T 27043-2012, ISO /IEC 17043:2010, IDT)

GB/T 28043 Statistical methods for proficiency testing using inter-laboratory comparisons (GB/T 28043-2019, ISO 13528:

2015, IDT)

3 Terms and Definitions

The following terms and definitions defined in GB/T 6683:1, GB/T 27043 and GB/T 28043 apply to this document:

3:1

Proficiency testing; PT Participants' performance was evaluated according to pre-established criteria through inter-laboratory comparisons:

[Source: GB/T 28043-2019, 3:2, modified]

3:2

Through the statistical analysis of the results obtained from aliquot samples of the same batch of homogeneous material, for the regular assessment of laboratory capacity participants in the implementation of standards

Procedures designed for test methods:

Note 1: The frequency of this test depends on the program objectives: The execution of each test involves testing a single batch of material: Usually the test materials are different from test to test:

Note 2: This program is also known as inter-laboratory cross-checking program: […]