ISO 5725-2 PDF

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Please proceed with checkout. You may experience issues viewing this site in Internet Explorer 9, 10 or The symbols used in IS0 are given in annex A. In particular, if outlying values are de- tected, all necessary steps shall be taken to investi- gate the reasons why they have been obtained, including re-appraisal of the suitability of the accepted reference value.

When a value for the bias of a measure- ment method is quoted, together with a test result obtained by that method, there is an implication that the same characteristic is being measured in exactly the same way. The laboratory bias is further considered in IS0 Methode de base pour la determination de la repetabilite et de la reproductibilite d’une methode de mesure normalisee.

Further regular testing is required to show that the labora- tory bias does not vary; the method described in IS0 may be used for this. C Derivation of equations The analysis was performed such that in the case where the absence of between-bottle variation is confirmed, the four analytical results can be con- sidered as replicates under repeatability conditions. 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.

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Accuracy trueness and precision of measurement methods and results – Part 2: Specifies four intermediate measures due to changes in observation conditions time, calibration, operator and equipment within a laboratory.

They contain a digital watermark to protect the copyright. The test results for each level are shown in figures B. The work of preparing International Standards is normally carried out through IS0 technical committees. 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.

BS ISO 5725-2:1994

Basic methods for the determination of repeatability and reproducibility of a standard measurement method Status: Your basket is empty. The h and k values are shown in figures B. In this report the following information shall be given: If the repeatability standard deviation, or, of the stan- dard measurement method is known, the estimate s, can be assessed by the following procedure.

However, for practical reasons, the choice of the number of laboratories is usually a compromise between the availability of re- sources and the desire to reduce the value of 6, to a satisfactory level.

GSO ISO – Standards Store – GCC Standardization Organization

Find Similar Items This product falls into the following categories. Reference materials could be either a certified reference materials; b materials manufactured for the purpose of the experiment with known properties; or c materials whose properties have been established by measurements using an alternative measure- ment method whose bias is known to be negligi- ble. Therefore the Index j for the level has been omitted 55725-2.

Genauigkeit Richtigkeit und Praezision von Messverfahren und Messergebnissen. The purpose of the two-bottle system was to confirm the absence of the between-bottle variation. The number of laboratories to be used is discussed in subclause 6. Utilization of trueness data Refer to clause 7 of IS0 In chemical anal- ysis, problems may arise from, for example, insufficient jso of temperature, moisture, ios ence of contaminants, etc. You can buy this standard from any national standardization body.

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The linear regression equations of the repeatability and reproducibility standard deviations versus levels of concentration are: Click iao learn more. Each laboratory re- ceived two randomly selected bottles of test sample for each level and performed duplicate analyses on each bottle.

If this is not true, the respective equations given in IS0 should be used to calculate s.

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. There are three cases, as follows.

ISO Accuracy of measurement methods and results-Part 2 Basic method – MBA智库文档

The units should be selected on a random basis for distribution. 5725–2 otherwise specified, no part of this publrcation may be reproduced or utrlized In any form or by any means, electronrc or mechanical, rncludrng photocopyrng and mrcrofilm, wrthout permission in writing from the publisher.

Analysis of the results showed that the between- bottle variation was indeed insignificant; the sample was considered to be homogeneous. One laboratory re- sult was identified as a straggler; it originated from the same laboratory Lab.

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In the former case, the repeatability standard devi- ation of the measurement method, or, will be isp for the assessment of the laboratory bias. Alternative methods for the 5725-22 nation of the precision of a standard measure- ment method. Intermediate measures of the precision of a standard measurement method. 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.