ASTM E691-12
Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- Standard No.
- ASTM E691-12
- Release Date
- 2012
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- Replace By
- ASTM E691-13
- Latest
- ASTM E691-23
- Scope
- 5. Significance and UseTop
Bottom 5.1 ASTM regulations require precision statements in all test methods in terms of repeatability and reproducibility. This practice may be used in obtaining the needed information as simply as possible. This information may then be used to prepare a precision statement in accordance with Practice E177.
5.2 Test Method and Protocol???In this practice, the term ???test method??? is used both for the actual measurement process and for the written description of the process, while the term ???protocol??? is used for the directions given to the laboratories for conducting the ILS.
5.3 Observations, Test Determinations and Test Results:
5.3.1 A test method often has three distinct stages, the direct observation of dimensions or properties, the arithmetic combination of the observed values to obtain a test determination, and the arithmetic combination of a number of test determinations to obtain the test result of the test method. In the simplest of test methods a single direct observation is both the test determination and the test result. For example, the test method may require the measurement of the mass of a test specimen prepared in a prescribed way. Another test method may require the measurement of the area of the test specimen as well as the mass, and then direct that the mass be divided by the area to obtain the mass per unit area of the specimen. The whole process of measuring the mass and the area and calculating the mass per unit area is a test determination. If the test method specifies that only one test determination is to be made, then the test determination value is the test result of the test method. Some test methods require that several determinations be made and the values obtained be averaged or otherwise combined to obtain the test result of the test method. Averaging of several determinations is often used to reduce the effect of local variations of the property within the material.
5.4 Test Specimens and Test Units???In this practice a test unit is the total quantity of material needed for obtaining a test result as specified by the test method. The portion of the test unit needed for obtaining a single test determination is called a test specimen. Usually a separate test specimen is required for each test determination.
5.5 Precision, Bias, and Accuracy of a Test Method:
5.5.1 When a test meth..........
ASTM E691-12 history
- 2023 ASTM E691-23 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 2022 ASTM E691-22 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 2021 ASTM E691-21 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 2020 ASTM E691-20 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 2019 ASTM E691-19e1 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 2019 ASTM E691-19 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 2018 ASTM E691-18 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 2016 ASTM E691-16 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 2015 ASTM E691-15 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 2014 ASTM E691-14 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 2013 ASTM E691-13 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 2012 ASTM E691-12 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 2011 ASTM E691-11 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 2009 ASTM E691-09e1 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 2009 ASTM E691-09 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 2008 ASTM E691-08 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 2005 ASTM E691-05 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- 1999 ASTM E691-99 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
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