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>\n
ISO 3951-1:2005 is primarily designed for application under the following conditions: <\/p>\n
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>\n
where only a single quality characteristic x<\/i> of these products is taken into consideration, which must be measurable on a continuous scale; <\/p>\n
where the measurement error is negligible, i.e. with a standard deviation no more than 10% of the process standard deviation; <\/p>\n
where production is stable (under statistical control) and the quality characteristic x<\/i> is distributed according to a normal distribution or a close approximation to the normal distribution; <\/p>\n
where a contract or standard defines an upper specification limit U<\/i>, a lower <\/b>specification limit L<\/i>, or both; <\/p>\n
an item is qualified as conforming if and only if its measured quality characteristic x<\/i> satisfies the appropriate one of the following inequalities:<\/p>\n
x<\/i> greater than or equal to L<\/i> (i.e. the lower specification limit is not violated);<\/p>\n
x<\/i> less than or equal to U<\/i> (i.e. the upper specification limit is not violated);<\/p>\n
x<\/i> greater than or equal to L<\/i> and x<\/i> less than or equal to U<\/i> (i.e. neither the lower nor the upper specification limit is violated).<\/p>\n
The first two inequalities are called cases with a single specification limit, and the third a case with double specification limits.<\/p>\n
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>\n","protected":false},"excerpt":{"rendered":"
Sampling procedures for inspection by variables \u2014 Part 1: Specification for single sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection for a single quality characteristic and a single AQL<\/b><\/p>\n\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n ISO<\/b><\/a><\/td>\n 2005-04<\/td>\n 114<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":615065,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[97,2634],"product_tag":[],"class_list":{"0":"post-615053","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-03-120-30","7":"product_cat-iso","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/615053","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/615065"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=615053"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=615053"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=615053"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}