Optical Flats Optical flats are used to test the flatness of fine-lapped surfaces such as the measuring faces on gauge blocks, measuring inserts, measuring tables, micrometers etc., which have to…

The natural standard for the metre is defined as the length of the path travelled by light in a vacuum during a time interval of 1/299 792 458 of a…

In order that the standard of length is uniform throughout Europe the National Metre is transferred from an Interferometric Measurement to one of Mechanical Comparison via the UKAS organisation and…

All engineers, regardless of the branch of the profession to which they belong, are constantly faced with the problem of measurement. It may be of time, mass, force, temperature, the…

Reference Standards on UKAS calibration Certificates The purpose of this section is to assist you with the discussions you may have with assessors from certification bodies about the content of…

The United Kingdom Accreditation Service (UKAS) Prior to 1968 firms requiring traceability in the calibration of standards required to send them to the National Physical Laboratory (NPL) or rely on…