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 flow of an electric current, length, angle, and so on; or it may be of the effects of some of these in combination. Almost invariably, the results of such measurements will determine the course of action the engineer takes thereafter. Thus the results obtained by

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 their approved laboratories. This entails the use of Reference Grade Gauge Blocks being used to calibrate lesser grades of Gauge Blocks with, what is to all intents and purposes, a very accurate Comparator. A Gauge Block Deviation Chart is produced by the Calibration Laboratory which

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 calibration certificates. Difficulties sometimes occur because assessors wish to see details of the reference standards used for calibration included on UKAS calibration certificates. Any calibration laboratory that holds UKAS accreditation has to operate in accordance with UKAS requirements at all times. These requirements apply not