Efforts to Japan Calibration Service System (JCSS) in Vacuum Measurement, from the “Error” and “Traceability” to the “Uncertainty”

Abstract

　This article describes the reason why ULVAC, Inc. tried to become the JCSS calibration Lab, and also describes the advantage to our vacuum gauge users. When operating ISO/IEC 17025 and getting traceability of measurement we needs to understand the concept of uncertainty of measurement. Understanding the difference of the concept of “measurement error” and “uncertainty of measurement” leads to understanding the concept of the traceability of measurement.