ISO 5725-2 PDF
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Annex B provides practical examples of estimating the precision of measurement methods by experiment. Intermediate measures of the precision of a standard measurement method – Part 4: Methode de base pour la determination de la repetabilite et de la reproductibilite d’une is de mesure normalisee. Bias can arise, for example, in chemical analysis if the measurement method fails to extract all of an element, or if the presence of one element interferes with the determination of another.
ISO matallic coatints measurement of coating thickness uso method by anodic dissolution. Reference is 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.
As a result the experiment may have to be repeated to yield the expected preci- sion values.
Calibration-different Equipment-different Identifier for a particular laboratory Identifier for intermediate measures of precision; in brackets, identification of ios type of intermediate situation ldentif ier for a particular level IS0 Relevant International Standards on sample division should be consulted.
International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. These intermediate measures can be established by an experiment within a specific laboratory or by an inter 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.
Basic method for the determination of repeatability and reproducability of a standard measurement method. The analytical results are listed in tableB.
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Learn more about the cookies we use and how to change your settings. Equations 8 to 5752-2 as- sume an equal number n of test results in each laboratory.
General principles and definitions – Part 2: General principles and definitions. Accuracy trueness and precision of measurement methods and results – Part 1: Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. Intermediate measures of the precision of a standard measurement method.
BS ISO 5725-2:1994
Ministry of Commerce and Industry. It is not applicable if the bias in the measurement of one property is affected by the level of a second property i. ido
Metrology and measurement in general Including measuring instruments in general, preferred numbers, standard measures, general aspects of reference materials, etc. Search all products by. 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. 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.
Basic methods for the determination of the trueness of a standard measurement method 1 Scope 1.
If the repeatability standard deviation of the standard measurement method has not been previously deter- mined in accordance with IS0s, will be con- sidered to be the best estimate of it. Looking to purchase to post on your company’s Intranet? Ein grundlegendes Verfahren fuer die Ermittlung der Wiederhol und Vergleichspraezision von festgelegten Messverfahren. The h values figureB. The boxed points in figures B. The faster, easier way to work with standards. Reference materials shall be homogeneous.
If the bias is found to 57252- statistically insignif- icant, then the objective is to determine the magnitude of the maximum bias that would, with a certain probability, remain undetected by the results of the experiment. The reference material should have a ios as close as possible to the matrix of the material to be subjected to the standard measurement method, e.
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.