Key Comparison: Calibration of Diameter Standards
Project Description
The measurands are the diameters of the two rings, two plugs and the diameter of a ceramic ball.
Roundness and straightness will also be measured on some standards additionally.
Progress Report 2025-10-22
Some problems arose during measurements on one of the standards, and one of the parameters was removed from the protocol.
CMI (Czechia), NIMT (Thailand), NIM (China) and SE “Ukrmetrteststandart” (Ukraine) are now participating in this project.
The technical protocol can be downloaded here>.