National Physical Laboratory

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Guides
NPL guides aim to improve measurement understanding and technical abilities across the UK and the rest of the world.

Latest guides

 

GPG 140: Guide to Weighing in Vacuum front cover Guide to Weighing in Vacuum

An expert-level guide describing the establishment of weighing-in-vacuum facilities and methodologies to achieve traceability from the realisation of the kilogram in vacuum, to weights stored and used in air.

GPG 139: Guide to the Storage of Primary Mass Standards front cover Guide to the Storage of Primary Mass Standards

An expert-level guide for measurement experts presenting information that will assist with the maintenance of the SI unit of mass at National Measurement institutes.

GPG 125 Introduction to Temperature Measurement

This guide is an updated version of a previous Good Practice Guide. It is aimed at beginners with some scientific knowledge, explains the fundamental concepts underpinning temperature measurement and gives practical advice on the techniques available.

GPG 137 Good Practice Guide for Miniature ETMT Tests

This guide is intended for researchers, scientists and engineers who may be new to the field of miniaturised mechanical testing with the Electro-Thermal Mechanical Test system (ETMT). It discusses various aspects of testing miniaturised testpieces of representative engineering alloys, especially at high temperatures with the ETMT developed by NPL and Instron UK.

GPG 135: Manager's Guide to Mathematical Modelling for Gamma Assays Manager's Guide to Mathematical Modelling for Gamma Assays

This guide is primarily aimed at Project Managers and other professionals with responsibility for commissioning the measurement of radioactive materials, where modelling methods may be required.

Featured

A beginner's guide to Measurement in Electronic and Electrical Engineering Beginner's Guide to Measurement in Electronic and Electrical Engineering

NPL and the Institution of Engineering and Technology have jointly produced a beginner's guide to measurement for electronic and electrical engineering students.

GPG 133: Good Practice Guide for Underwater Noise Measurement Good Practice Guide for Underwater Noise Measurement

A guide designed for those making in-situ measurements of underwater sound, such as oil and gas companies, and developers of marine renewable energy.

A beginner's guide to humidity measurement Beginner's Guide to Measurement in Mechanical Engineering

NPL and the Institution of Mechanical Engineers have jointly produced a guide to measurement aimed at mechanical engineering students.

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Beginner's guides

The following guides to measurement and uncertainty provide introductions to basic measurement concepts to get yourself started in the world of measurement.

Beginner's guide to uncertainty in measurement

Beginner's guide to measurement

Beginner's guide to measurement in electronic and electrical engineering

Beginner's guide to measurement in mechanical engineering

Introduction to Temperature Measurement

Explore the wonderful world of measurement with NPL e-Learning

Collaborative guides

NPL collaborates with other organisations to produce a range of guides.

Guide to the Measurement of Humidity

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