Calibration of the comparator for long length measures used for the verification/calibration of tape measures with high accuracy

摘要

This paper describes the measurement method used for the verification or the calibration of tape measures with a nominal length of between 2 m and 50 m using a longitudinal comparator for long length measures, specially designed for this purpose. It then analyses the sources of errors that affect the comparator and gives the estimation of the measurement uncertainty. This longitudinal comparator is a unique reference standard installation, designed and built by the Length Laboratory of the National Institute of Metrology of Romania.