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Ein grundlegendes Verfahren fuer die Ermittlung der Wiederhol und Vergleichspraezision von festgelegten Messverfahren. All standards are subject to revision, and parties to agreements based on this part of IS0 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
You may find similar items within these 57252- by selecting from the choices below:. IS0 l should be read in conjunction with all other parts of IS0including this part, because it gives the underlying definitions and general principles.
BS ISO 5725-2:1994
This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3. 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 57255-2 the same characteristic is being measured in exactly the same way.
Alternative methods for the determi- nation of the precision of a standard measure- ment method. They contain a digital watermark to protect the copyright. What action should be taken with respect to re- jected outlying laboratories?
It is not applicable if the bias in the iiso of one property is affected by the level of a second property i.
General principles and definitions – Part 2: 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. Laboratory means and laboratory variances Lab. Looking to purchase to post on your company’s Intranet? The units should be selected on a random basis for distribution. Equations 8 to 10 as- sume an equal number n of test results in each laboratory. 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.
Analytical results as percentage Mn Lab. It may appear that some laboratories did not use the required equipment or 575-2 not work ac- cording to the specified conditions.
IS0 consists of the following parts, under the general title Accuracy trueness and precision of measurement methods and results: International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
Utilization of trueness data Refer to clause 7 of IS0 Each laboratory re- ceived two randomly selected bottles of test sample for each level and performed duplicate analyses on 57255-2 bottle.
In the former case, the repeatability standard devi- ation, cr, will be used for the assessment of the bias of the measurement method. If it is proposed to undertake an experiment lso estimate laboratory bias, then it should be realized that the estimate will be valid only at the time of the ex- periment.
ISO Accuracy of measurement methods and results-Part 2 Basic method – MBA智库文档
The test results for each level are shown in figures B. 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.
Please proceed with checkout. Annex A forms an integral part of this part of IS0 Accept and continue Learn more about the cookies we use and how to change your settings. General principles and definitions. 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: There are three cases, as follows. Intermediate measures of the precision of a standard measurement 575-2 – Part 4: It was therefore decided to discard the results from laboratory 10 completely; it should be the object of special attention, and the matter should be resolved.
A Awar G 1, Al- though, for some measurement methods, the true value cannot isso 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.
Exactitude justesse et fidelite des resultats et methodes de mesure. The number of laboratories to be used is discussed in subclause 6.
In some cases it will be important to include, in the assessment exper- iment, a series of reference materials, each corre- sponding to a different level of the property, as the bias of the standard measurement method may be different at different levels. If the 7525-2 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.
Annexes B, C and D are for information only. The results of this computation are summarized in table B. In chemical anal- ysis, problems may arise from, for example, insufficient control of temperature, moisture, pres- ence of contaminants, etc.
Accuracy trueness and precision of measurement methods and results – Part 2: General principles and definitions. In this report the following information shall be given: A guide to decid- ing how many is given below. As a result the experiment may have to be repeated to yield the expected preci- sion values.
This requires an experiment involving many laboratories, very much as described 55725-2 IS0 Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
If the measurement process is non-destructive, it is poss- ible to give all the laboratories in the interlaboratory experiment the same unit of reference material, but this will extend the time-frame of the experiment. Intermediate measures of the precision of a standard measurement method Specifies four intermediate measures due to changes in observation conditions time, calibration, operator and equipment within a laboratory.
GSO ISO – Standards Store – GCC Standardization Organization
Analysis of the results showed that the between- bottle variation was indeed insignificant; the sample was considered to be homogeneous. What action is to be taken concerning its publication?
All measurements are to be carried out according to that standard method.