| Standard | Role | |----------|------| | ISO 14253-2 | How to estimate uncertainty in GPS measurement | | ISO 14253-5 | Decision rules for testing conformity of measuring equipment | | ISO/IEC 17025 | General requirements for calibration labs (references 14253-1) | | ISO 22514-7 | Capability of measurement processes |
Spec: 10.00 mm ± 0.05 mm
→ LSL = 9.95 mm, USL = 10.05 mm
Measured: 10.03 mm
U (k=2) = 0.04 mm
Check:
Conclusion: Reject because uncertainty interval exceeds USL. INTERNATIONAL STANDARD ISO 14253 1.pdf
No actual image, but the logic is:
While not explicitly using this Latin legal phrase, the standard applies the logic of benefit of the doubt in specific ways:
Subject: Decision Rules for Proving Conformance or Non-Conformance with Specifications Standard Reference: ISO 14253-1 (Geometrical Product Specifications - GPS) Status: International Standard | Standard | Role | |----------|------| | ISO
ISO 14253-1 creates three distinct zones based on the measurement result ($y$) and the expanded measurement uncertainty ($U$). The limits of specification are defined as the Upper Specification Limit ($USL$) and Lower Specification Limit ($LSL$).
ISO 14253‑1 is a fundamental standard within the Geometrical Product Specification (GPS) system. It establishes decision rules for verifying whether a manufactured workpiece or a measuring instrument conforms to a given specification limit (e.g., upper or lower tolerance limit) when measurement uncertainty is present.
The key purpose is to resolve ambiguity: No measurement is perfect. Even with a high‑quality measuring system, there is always uncertainty. ISO 14253‑1 tells industry how to decide “pass” or “fail” while accounting for that uncertainty — thereby reducing false acceptances (consumer risk) and false rejections (producer risk). Spec: 10
The standard applies to:
It explicitly refers to ISO/IEC Guide 98‑3 (Guide to the Expression of Uncertainty in Measurement, GUM) for evaluating measurement uncertainty.