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ASTM D 4356 Document Information:
Title
Standard Practice for Establishing Consistent Test Method Tolerances
ASTM International
Publication Date:
Mar 30, 1984
Scope:
This practice should be used in the development of any test method in
which the determination value
is calculated from measurement values by means of an equation. The
practice is not applicable to
such determination values as those calculated from counts of
nonconformities, ratios of successes
to failures, gradings, or ratings.
The purpose of this practice is to provide guidance in the specifying
of realistic and consistent
tolerances for making measurements and for reporting the results of
testing.
This practice can be used as a guide for obtaining the minimum test
result tolerance that should be
specified with a particular set of specified measurement tolerances,
the maximum permissible
measurement tolerances which should be specified to achieve a
specified test result tolerance, and
more consistent specified measurement tolerances.
These measurement and test result tolerances are not statistically
determined tolerances that are
obtained by using the test method but are the tolerances specified in
the test method.
In the process of selecting test method tolerances, the task group
developing or revising a test
method must evaluate not only the consistency of the selected
tolerances but also the technical and
economical feasibility of the measurement tolerances and the
suitability of the test result
tolerance for the purposes for which the test method will be used.
This practice provides guidance
only for establishing the consistency of the test method tolerances.
This practice is presented in the following sections:
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
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