Working and Check Standards for NIST Surface and Microform Measurements
Jun-Feng Song, Theodore V. Vorburger
Different working standards and check standards are used in the NIST surface and microform measurement laboratory for calibrating instruments, establishing measurement traceability and control measurement uncertainty. The basic requirements for these standards include geometric requirements, material stability and calibration uncertainty. In this paper, the definitions, characteristics and utilizations of working and check standards are described. Some examples are used for demonstrating the selection and utilization of working and check standards in NIST surface and microform measurements. One example comes from the microform measurements of the Rockwell diamond indenters. The check standards have been successfully used to establish measurement traceability, reduced measurement uncertainty of the least squares radius from micrometers to sub-micrometers, and prevented an unsuitable diamond indenter from being accepted as a national Rockwell hardness calibration indenter.
Proceedings of NCSL Workshop & Symposium
January 1, 1995
check standards, microform, roughness, traceability, uncertainty, working standards