Standards tracker
What each standard is for, the current edition, and where to get it from the publisher. Summaries are in our own words; we never reproduce standards text.
Draft summaries, not yet reviewed. Always confirm the current edition with the publisher before relying on it.
General requirements for the competence of testing and calibration laboratories · ISO / IEC
The accreditation standard for calibration and testing labs: impartiality, competence, traceability, uncertainty, decision rules, reporting and software validation.
Evaluation of measurement data: Guide to the expression of uncertainty in measurement · BIPM / JCGM
The method behind every uncertainty budget: Type A and Type B evaluation, combining components, coverage factors.
International vocabulary of metrology · BIPM / JCGM
The agreed definitions of terms like traceability, calibration, uncertainty and measurand.
ILAC policy for measurement uncertainty in calibration · ILAC
How accredited labs must state CMCs and report uncertainty on calibration certificates.
Requirements for the calibration of measuring and test equipment · NCSL International
US requirements for calibration systems, including the 2% probability-of-false-accept rule often cited alongside TUR.
Guide for the use of the International System of Units (SI) · NIST
How to write SI units correctly and the conversion factors behind our pressure and torque tools.
Industrial platinum resistance thermometers and platinum temperature sensors · IEC
Pt100/Pt1000 resistance–temperature relationship and tolerance classes for industrial RTDs.
Standard specification for industrial platinum resistance thermometers · ASTM International
The US counterpart to IEC 60751 for industrial platinum RTDs.
Standard specification for laboratory weights and precision mass standards · ASTM International
Tolerance classes and physical requirements for laboratory weights.
Hand torque tools: requirements and calibration · ISO
Part 1 sets conformance requirements for hand torque tools; Part 2 sets the calibration method and uncertainty evaluation.
Torque instruments · ASME
US requirements for hand torque wrenches, screwdrivers and testers.