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<p>ISO 3951-1:2005 specifies an acceptance sampling system of single sampling plans for inspection by variables, in which the acceptability of a lot is implicitly determined from an estimate of the percentage of nonconforming items in the process, based on a random sample of items from the lot.</p>
<p>ISO 3951-1:2005 is primarily designed for application under the following conditions: </p>
<p>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; </p>
<p>where only a single quality characteristic <i>x</i> of these products is taken into consideration, which must be measurable on a continuous scale; </p>
<p>where the measurement error is negligible, i.e. with a standard deviation no more than 10% of the process standard deviation; </p>
<p>where production is stable (under statistical control) and the quality characteristic <i>x</i> is distributed according to a normal distribution or a close approximation to the normal distribution; </p>
<p>where a contract or standard defines an upper specification limit<i> U</i>, a lower<b> </b>specification limit <i>L</i>, or both; </p>
<p>an item is qualified as conforming if and only if its measured quality characteristic<i> x</i> satisfies the appropriate one of the following inequalities:</p>
<p><i>x</i> greater than or equal to <i>L</i> (i.e. the lower specification limit is not violated);</p>
<p><i>x</i> less than or equal to <i>U</i> (i.e. the upper specification limit is not violated);</p>
<p><i>x</i> greater than or equal to <i>L</i> and <i>x</i> less than or equal to <i>U</i> (i.e. neither the lower nor the upper specification limit is violated).</p>
<p>The first two inequalities are called cases with a single specification limit, and the third a case with double specification limits.</p>
<p>If double specification limits apply, it is assumed in ISO 3951-1:2005 that conformance to both specification limits is equally important to the integrity of the product; in such cases it is appropriate to apply a single AQL to the combined percentage of product outside the two specification limits. This is referred to as combined control. </p>
Reģistrācijas numurs (WIID)
34640
Darbības sfēra
<p>ISO 3951-1:2005 specifies an acceptance sampling system of single sampling plans for inspection by variables, in which the acceptability of a lot is implicitly determined from an estimate of the percentage of nonconforming items in the process, based on a random sample of items from the lot.</p>
<p>ISO 3951-1:2005 is primarily designed for application under the following conditions: </p>
<p>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; </p>
<p>where only a single quality characteristic <i>x</i> of these products is taken into consideration, which must be measurable on a continuous scale; </p>
<p>where the measurement error is negligible, i.e. with a standard deviation no more than 10% of the process standard deviation; </p>
<p>where production is stable (under statistical control) and the quality characteristic <i>x</i> is distributed according to a normal distribution or a close approximation to the normal distribution; </p>
<p>where a contract or standard defines an upper specification limit<i> U</i>, a lower<b> </b>specification limit <i>L</i>, or both; </p>
<p>an item is qualified as conforming if and only if its measured quality characteristic<i> x</i> satisfies the appropriate one of the following inequalities:</p>
<p><i>x</i> greater than or equal to <i>L</i> (i.e. the lower specification limit is not violated);</p>
<p><i>x</i> less than or equal to <i>U</i> (i.e. the upper specification limit is not violated);</p>
<p><i>x</i> greater than or equal to <i>L</i> and <i>x</i> less than or equal to <i>U</i> (i.e. neither the lower nor the upper specification limit is violated).</p>
<p>The first two inequalities are called cases with a single specification limit, and the third a case with double specification limits.</p>
<p>If double specification limits apply, it is assumed in ISO 3951-1:2005 that conformance to both specification limits is equally important to the integrity of the product; in such cases it is appropriate to apply a single AQL to the combined percentage of product outside the two specification limits. This is referred to as combined control. </p>
