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GEIA EIA-585 Document Information:
Title
Zero Acceptance Number Sampling Procedures and Tables for Inspection by Attributes of Isolated Lots
Government Electronics & Information Technology Association
Publication Date:
Jun 1, 1991
Scope:
PURPOSE
Conventional attribute sampling plans based upon acceptance numbers
that permit acceptance of a lot
when some allowable number of nonconformances are encountered during
inspection are no longer
desirable. In addition, emphasis is now placed on the quality level
that is received by the
customer. This relates directly to the Lot Tolerance Percent Defective
(LTPD) value or the Limiting
Quality Protection of MIL-STD-105. Measuring quality levels in percent
nonconforming, although not
incorrect, has been replaced with quality levels measured in parts per
million (PPM). As a result,
this standard addresses the need for sampling plans that can augment
MIL-STD-105, are based upon a
zero acceptance number, and address quality (nonconformance) levels in
the parts per million range.
This document does not address minor nonconformances, which are
defined as nonconformances that are
not likely to reduce materially the usability of the unit of product
for its intended purpose.
APPLICATION
The sampling plans based upon a zero acceptance number designated in
this standard are applicable,
but not limited, to inspection of the following:
a. End items.
b. Components and raw material.
These plans are designed for use with isolated lots,.and the Operating
Characteristic curves are
located in Appendix A. The manufacturer's risk, which is approximately
equal to the AQL values of
MIL-STD-105, is of little concern to consumers and users of zero
acceptance number sampling plans.
What is of interest is the level of nonconformances that will not be
exceeded at a given confidence
level, in any shipment of material to the consumer.
INSPECTION
Inspection is the process of measuring, examining, testing, or
otherwise comparing the unit of
product with the requirements.
INSPECTION BY ATTRIBUTES
Inspection by attributes is inspection whereby either the unit of
product is classified simply as
nonconforming or conforming, or else the number of nonconformances in
the unit of product is
counted and compared to a given requirement or set of requirements.
UNIT OF PRODUCT
The unit of product is the thing inspected in order to determine its
classification as
nonconforming or conforming or to count the number of nonconformances.
It may be a single article,
a pair, a set, a length, an area, an operation, a volume, a component
of an end product, or the end
product itself. The unit of product may or may not be the same as the
unit of purchase, supply,
production, or shipment.
NONCONFORMANCE
A nonconforming unit is one that is likely to result in failure, or to
reduce materially the
usability of the unit of product for its intended purpose.
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