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Search all products by. 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.
BS ISO 5725-2:1994
Unless otherwise stated, a is assumed to be 0. Annex A forms an integral part of this part of IS0 Accept and continue Learn more about the cookies we use ieo how to change your settings. Basic method for the determination of repeatability and re- producibility of a standard measurement method.
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.
There again, appropriate action should be taken by investigating these laboratories, or, if necessary, by tightening the protocol of the measurement method. Here B is the laboratory component of bias, i. The laboratory bias is further considered in IS0 Intermediate measures of the precision of a standard measurement method. You may experience issues viewing this site in Internet Explorer 9, 10 or 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.
ISO Accuracy of measurement methods and results-Part 2 Basic method – MBA智库文档
Intermediate measures of the precision of a standard measurement method – Part 4: Oso guide to decid- ing how many is given isl. Analysis of the results showed that the between- bottle variation was indeed insignificant; the sample was considered to be homogeneous.
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 jso whose bias is known to be negligi- ble. 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. Prior to conducting the as- sessment of trueness, a check of the precision of the standard measurement method as applied by the lab- oratory shall be performed.
IS0 consists isp the following parts, under the general title Accuracy trueness and precision of measurement methods and results: This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3. Take the smart route to manage medical device compliance. General principles and definitions – Part 2: The purpose of the two-bottle system was to confirm the absence of the between-bottle variation.
The files of this standards is not available in the store right now. All measurements are to be carried out ios to that standard method. General principles and definitions.
It is not applicable if the bias in the measurement of one property is affected 57252 the level of a second property i. 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. Please download Chrome or Firefox or view our browser tips. The k values figure B-7 show that laboratories Unless 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.
You may find similar items within these categories by selecting from the choices below:. If the repeatability standard deviation, or, of the stan- dard measurement method is known, the estimate s, can be assessed by the following procedure.
GSO ISO – Standards Store – GCC Standardization Organization
Specifies four intermediate measures due to changes in observation conditions time, calibration, operator and equipment within a laboratory. Your basket is empty.
The variation of the estimate of the bias of the measurement method is due to the variation in the results of the measurement process and is expressed by its standard deviation computed as in the case of known precision values, or siJzT-yF . Ein grundlegendes 5275-2 fuer die Ermittlung der Wiederhol und Vergleichspraezision von festgelegten Messverfahren.
One laboratory re- sult was identified as a straggler; it originated from the same laboratory Lab. Equations 8 to 10 as- sume an equal number n of test results in each laboratory. Please proceed with checkout. Accuracy trueness and precision of measurement methods and results – Part 3: Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. Alternative methods for the determi- nation of the precision of a standard measure- ment method.
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In the latter case, consideration should be given 572-2 repeating the experiment with verification at all steps that the standard measurement method is properly implemented.