ISO 14253-1-2017 PDF

Full title and description

Geometrical product specifications (GPS) — Inspection by measurement of workpieces and measuring equipment — Part 1: Decision rules for verifying conformity or nonconformity with specifications. This document defines decision rules and associated concepts (acceptance, rejection and uncertainty zones, guard bands and conformance probabilities) to be used when inspection is carried out by measurement and measurement uncertainty needs to be taken into account.

Abstract

ISO 14253-1:2017 establishes rules for verifying whether a measured characteristic of a workpiece (or population) or a metrological characteristic of measuring equipment meets a given specification when the measurement result lies close to specification limits. The standard formalizes acceptance, rejection and uncertainty zones using guard bands and requires the use of estimated measurement uncertainty (in line with GUM/Guide 98 principles); it also defines a default conformance probability (used to set guard bands) and provides guidance for supplier/customer relationships.

General information

• Status: Published (confirmed).
• Publication date: October 2017 (Edition 3).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 17.040.40 (Geometrical Product Specification — GPS).
• Edition / version: 3 (third edition, 2017).
• Number of pages: 23 (ISO published text, official edition).

These bibliographic details are taken from the ISO catalogue entry for ISO 14253-1:2017.

Scope

ISO 14253-1:2017 applies to verification by measurement of workpiece characteristics, population characteristics and metrological characteristics of measuring equipment where the characteristics and limits are expressed as quantity values. The standard is intended for specifications defined in general GPS standards (ISO/TC 213 family) and addresses the practical decision problem that arises when measured values are close to specification limits by prescribing how to incorporate measurement uncertainty into acceptance/nonconformance decisions.

Key topics and requirements

• Definition of acceptance, rejection and uncertainty zones around specification limits using guard bands.
• Use of estimated measurement uncertainty in the verification decision (aligned with the GUM/ISO Guide 98 series).
• Default conformance probability approach (used to set guard bands and keep decision risk constant), replacing previous simple k-factor rules in earlier editions.
• Rules for proving conformity (supplier onus) and for proving nonconformity (customer onus), and guidance for agreeing decision rules between parties.
• Applicability restricted to characteristics expressed as quantity values and to specifications in the GPS domain.

Key technical content and practical examples of application are covered in the main clauses and informative annexes of the standard.

Typical use and users

Typical users include metrologists, quality and inspection engineers, calibration laboratories, suppliers and customers involved in contractual acceptance, equipment manufacturers, and standards implementers/auditors. The standard is used to formalize inspection decisions, to reduce disputes on near-limit results, and to improve traceability and consistency in conformity assessments performed by measurement.

Related standards

ISO 14253-1 is part of the GPS and verification family maintained by ISO/TC 213. Related documents include ISO 14253-2 (guidance on estimation of measurement uncertainty in GPS measurement and product verification), ISO 14638 (GPS matrix and related GPS specifications), and the ISO/IEC Guide 98 series (GUM) on the expression of uncertainty in measurement. It also interacts with application-specific GPS standards and regional/adopted versions (for example EN ISO 14253-1:2017).

Keywords

GPS, decision rules, measurement uncertainty, guard band, acceptance zone, uncertainty zone, conformance, nonconformance, verification, metrology, ISO 14253-1.

FAQ

Q: What is this standard?

A: ISO 14253-1:2017 is an international standard that defines decision rules for verifying, by measurement, whether workpieces or measuring equipment meet specified tolerances or maximum permissible errors when measurement uncertainty is taken into account.

Q: What does it cover?

A: It covers how to use estimated measurement uncertainty to decide conformity or nonconformity, including the definition of guard bands and acceptance/rejection/uncertainty zones, default conformance probability concepts, and supplier/customer roles in verification. The standard applies where characteristics and limits are expressed as quantity values.

Q: Who typically uses it?

A: Metrology and quality professionals: calibration laboratories, inspection and test labs, production quality engineers, suppliers and customers engaged in contractual acceptance, and standards developers implementing GPS verification practices.

Q: Is it current or superseded?

A: ISO 14253-1:2017 is the current (third) edition published in 2017; the ISO entry shows it was reviewed and confirmed and remains current as of the latest ISO review. It replaces earlier editions (1998 and 2013).

Q: Is it part of a series?

A: Yes — it is Part 1 of ISO 14253 (decision rules). Other related parts and documents in the GPS/verification family include ISO 14253-2 (guidance on estimating uncertainty in GPS measurement and product verification) and other GPS standards from ISO/TC 213.

Q: What are the key keywords?

A: Decision rules, measurement uncertainty, guard bands, acceptance zone, uncertainty zone, conformance probability, GPS, verification, metrology.