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ISO Accuracy of measurement methods and results-Part 2 Basic method – MBA智库文档
In the latter case, it is necessary to investigate the causes of the discrep- ancy and possibly to 57252 the experiment prior to proceeding further. The h values figureB. You may experience issues viewing this site in Internet Explorer 9, 10 or If the repeatability of the measurement method is poor, then it will not be practical to achieve a high degree of certainty in the estimate of the bias of the laboratory.
What action should be taken with respect to re- jected outlying laboratories? A guide to decid- ing how many is given below.
BS ISO 5725-2:1994
In the latter case, a careful examination of the working conditions of each laboratory shall be carried out before the assessment of the bias of the standard measurement method is undertaken.
In the former case, the repeatability standard devi- ation of the measurement method, or, will be used for the assessment of the laboratory bias. C Derivation of equations It may appear that some laboratories did not use the required equipment or did not work ac- cording to the specified conditions.
The first condition is actually developed in 4. Looking to purchase to post on your company’s Intranet?
The test results for each level are shown in figures B. In this report the following information shall be given: If so, what are the improvements required? Company organization, management and quality. Analysis of the results showed that the between- bottle variation was indeed insignificant; the sample was considered to be homogeneous.
To request this FREE document, please email us. The number of laboratories to be used is discussed in subclause 6. The results of this computation are summarized in table B. Basic method for the determination of repeatability and reproducability of a standard measurement method. Reference materials shall be homogeneous.
The uncertainty in the estimate of the laboratory bias depends on the repeatability of the measurement method and on the number of test results obtained. Basic methods for the determination of repeatability and reproducibility of a standard measurement method.
In the latter case, consideration should be given to repeating the experiment with verification at all steps that the standard measurement method is properly implemented. Jso four intermediate measures due to changes in observation conditions time, calibration, operator and equipment within a laboratory.
Unless otherwise stated, a is assumed to be 0, There are three cases, as follows. A technical corrigendum was issued for this standard after its publication.
A Awar G 1, Basic method for the determination of repeatability and re- producibility of a standard measurement method – Part 3: Basic methods for the determination of repeatability and reproducibility of a standard measurement method Status: In order for the results of an experiment to be able to detect with a high probability see annex Cl a prede- termined magnitude of bias, the minimum number of laboratories, p, and test results, n, shall satisfy the following equation: Outliers and stragglers Level Lab.
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Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
The h and k values are shown in figures B. Search all products by. Accuracy trueness and precision of measurement methods and results — Part 2: Al- though, for some measurement methods, the true value cannot be known exactly, it may be possible to have an accepted reference value for the property being measured; for example, if suitable reference materials are available, or if the accepted reference value can be established by refer- ence to another measurement method or by preparation of a known sample.
Equations 8 to 10 as- sume an equal number n of test results in each laboratory. The laboratory bias is further considered in IS0 iiso The work of preparing International Standards is normally carried out through IS0 technical committees.
Do the results of isso accuracy experiment justify the acceptability of the measurement method for adoption as a standard? Exactitude justesse et fidelite des resultats et methodes de mesure. If it is proposed to undertake an experiment to estimate laboratory bias, then it should be realized that the estimate will be valid only at the time of the ex- periment.
You may find similar items within these categories by selecting from the choices below:. Annexes B, C and D are for information only. The differences are a there is an additional requirement to use an ac- cepted reference value, and b the number of participating laboratories and the number of test results shall also satisfy the re- quirements given in 4.
The symbols used in IS0 are given in annex A. Intermediate measures of the precision of a standard measurement method – Part 4: There again, appropriate action should be taken 5752-2 investigating these laboratories, or, if necessary, by tightening the protocol of the measurement method.
The reference material should have a matrix as close as possible to the matrix of the material to be subjected to the standard measurement method, e. One laboratory re- sult was identified as a straggler; it originated from the same laboratory Lab.