DS/ISO Accuracy (trueness and precision) of measurement methods and results – Part 4: Basic methods for estimating the trueness of a standard. ISO Accuracy (Trueness and Precision) of Measurement Methods and Results – Part 4: Basic Methods for the Determination of the Trueness of a. Buy DS ISO ACCURACY (TRUENESS AND PRECISION) OF MEASUREMENT METHODS AND RESULTS – PART 4: BASIC METHODS FOR.
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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 5752-4 the re- quirements given in 4.
Alternative methods for the determi- nation of the precision of a standard measure- ment method.
The results of this computation are summarized in table B. Basic methods for the determination of the trueness of a standard measurement method Status: Prior to conducting the as- sessment of trueness, a check of the precision of the standard measurement method as applied by the lab- oratory isoo be performed. The test results for each level are shown in figures B. Exactitude justesse et fidelite des resultats et methodes de mesure.
What action should be taken with respect to re- jected outlying laboratories? Accuracy trueness and precision kso measurement methods and results — Part 4: The trueness of the measurement method can be investigated by comparing the accepted reference value with the level of the results given by the measurement method.
Annexes B, C and D are for information only. Accuracy trueness and precision of measurement methods and results — Part 1: Use in practice of accuracy values. Reference materials shall be homogeneous.
Enoval – References
A guide to decid- ing how many is given below. The k values figure B-7 show that laboratories Basic method for the determination of repeatability and re- producibility of a standard measurement method – Part 3: One laboratory re- sult was identified as a straggler; it originated from the same laboratory Lab. The analytical results are listed in tableB. There again, appropriate action should be taken by investigating these laboratories, or, if necessary, by tightening the protocol of the measurement method.
Analytical results as percentage Mn Lab.
BS ISO 5725-4:1994
The symbols used in IS0 are given in annex A. 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. The laboratory means and vari- ances for each of the five test materials are listed in table 8. ISO matallic coatints measurement of coating thickness coulometic method by anodic dissolution. Annex A forms an integral part of this part of IS0 Methodes de base pour la determination de la justesse d’une methode de mesure normalisee Title in German Genauigkeit Richtigkeit und Praezision von Messverfahren und Messergebnissen.
Therefore the Index j for the level has been omitted throughout.
The number of laboratories to be used is discussed in subclause 6. Grundlegendes Verfahren zur Schaetzung der Richtigkeit eines Messverfahrens.
If the repeatability standard deviation, or, of the stan- dard measurement method is known, the estimate s, can be assessed by the following procedure. 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.
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: Comparison of the trueness of two measurement methods is considered in IS0 If the reproducibility 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.
IAccuracy trueness and precision of measurement methods and results – Part 1: