SIST ISO 8258:1996/C1:1996
(Corrigendum)ISO 8258:1991/Cor 1:1993
ISO 8258:1991/Cor 1:1993
Adds in table 5, third column, first line "3" after "±".
Cartes de contrôle de Shewhart — Rectificatif technique 1
Shewhart control charts - Technical corrigendum 1
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Shewhart control charts - Technical corrigendum 1ISO 8258:1991/Cor 1:199303.120.30Application of statistical methodsICS:Ta slovenski standard je istoveten z:ISO 8258:1991/Cor 1:1993SIST ISO 8258:1996/C1:1996en01-september-1996SIST ISO 8258:1996/C1:1996SLOVENSKI
STANDARD
SIST ISO 8258:1996/C1:1996
INTERNATIONAL STANDARD IS0 8258:1991 TECHNICAL CORRIGENDUM 1 Published 1993-04-15 INTERNAT’KBNAL DRGANIU’WN FOR STANDARDUAllOfh M~YHAPO&HAfi OPTAbiH3AuM no ~AH~APfb434h’b DRGANISATION lN’l’HlNATK)NALE DE NORMALISATION Shewha
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— amplifies the general principles for designing experiments for the numerical estimation of the precision of measurement methods by means of a collaborative interlaboratory experiment;
— provides a detailed practical description of the basic method for routine use in estimating the precision of measurement methods;
— provides guidance to all personnel concerned with designing, performing or analysing the results of the tests for estimating precision.
NOTE Modifications to this basic method for particular purposes are given in other parts of ISO 5725.
1.2 It is concerned exclusively with measurement methods which yield measurements on a continuous scale and give a single value as the test result, although this single value can be the outcome of a calculation from a set of observations.
1.3 It assumes that in the design and performance of the precision experiment, all the principles as laid down in ISO 5725-1 are observed. The basic method uses the same number of test results in each laboratory, with each laboratory analysing the same levels of test sample; i.e. a balanced uniform-level experiment. The basic method applies to procedures that have been standardized and are in regular use in a number of laboratories.
1.4 The statistical model of ISO 5725-1:1994, Clause 5, is accepted as a suitable basis for the interpretation and analysis of the test results, the distribution of which is approximately normal.
1.5 The basic method, as described in this document, (usually) estimates the precision of a measurement method:
a) when it is required to determine the repeatability and reproducibility standard deviations as defined in ISO 5725-1;
b) when the materials to be used are homogeneous, or when the effects of heterogeneity can be included in the precision values; and
c) when the use of a balanced uniform-level layout is acceptable.
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1.1 This document
— specifies basic methods for estimating the bias of a measurement method and the laboratory bias when a measurement method is applied;
— provides a practical approach of a basic method for routine use in estimating the bias of measurement methods and laboratory bias;
— provides a brief guidance to all personnel concerned with designing, performing or analysing the results of the measurements for estimating bias.
1.2 It is concerned exclusively with measurement methods which yield measurements on a continuous scale and give a single value as the measurement result, although the single value can be the outcome of a calculation from a set of observations.
1.3 This document applies when the measurement method has been standardized and all measurements are carried out according to that measurement method.
NOTE In ISO/IEC Guide 99:2007(VIM), "measurement procedure" (2.6) is an analogous term related to the term "measurement method" used in this document.
1.4 This document applies only if an accepted reference value can be established to substitute the true value by using the value, for example:
— of a suitable reference material;
— of a suitable measurement standard;
— referring to a suitable measurement method;
— of a suitable prepared known sample.
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This International Standard specifies sequential sampling plans and procedures for inspection by
variables of discrete items.
The plans are indexed in terms of producer’s risk point and the consumer’s risk point. Therefore, they
are suitable not only for the purposes of acceptance sampling, but for the more general purpose of the
testing of simple statistical hypotheses for proportions.
The purpose of this International Standard is to provide procedures for the sequential assessment
of inspection results that may be used to induce the supplier to supply lots of a quality having a high
probability of acceptance. At the same time, the consumer is protected by a prescribed upper limit to
the probability of accepting a lot (or process) of poor quality.
This International Standard is primarily designed for use under the following conditions:
a) where the inspection procedure is to be applied to a continuing series of lots of discrete products
all supplied by one producer using one production process. In such a case, sampling of particular
lots is equivalent to the sampling of the process. If there are different producers or production
processes, this International Standard shall be applied to each one separately;
b) where only a single quality characteristic x of these products is taken into consideration, which
must be measurable on a continuous scale;
c) where the measurement error is negligible (i.e. with a standard deviation no more than 10 % of the
process standard deviation);
d) where production is stable (under statistical control) and the quality characteristic x has a known
standard deviation, and is distributed according to a normal distribution or a close approximation
to the normal distribution;
CAUTION — The procedures in this International Standard are not suitable for application to
lots that have been screened previously for nonconforming items.
e) where a contract or standard defines an upper specification limit U, a lower specification limit L, or
both; an item is qualified as conforming if and only if its measured quality characteristic, x, satisfies
the appropriate one of the following inequalities:
1) x ≤ U (i.e. the upper specification limit is not violated);
2) x ≥ L (i.e. the lower specification limit is not violated);
3) x U and x L (i.e. neither the upper nor the lower specification limit is violated.)
Inequalities 1) and 2) are called cases with a “single specification limit”, and 3) is the case with “double
specification limits”.
In this International Standard, it is assumed that, where double specification limits apply, conformance
to both specification limits is either equally important to the integrity of the product or is considered
separately for both specification limits. In the first case, it is appropriate to control the combined
percentage of product outside the two specification limits. This is referred to as combined control. In
the second case, nonconformity beyond each of the limits is controlled separately, and this is referred
to as separate control.
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