YOKOGAWA GROUP'S INSTRUMENT TRACEABILITY AND MANAGEMENT

摘要

It is the responsibility of instrument manufacturers to maintain the traceability of measuring instruments and testing equipment to national standards, in order to ensure the consistency and reliability of measured data. This paper discusses traceability with a focus on electrical, optical, pressure and temperature measurements. The DC voltage standard is a Zener-type standard voltage source, the DC resistance standard is a Yokogawa-manufactured standard resister, the AC voltage and AC current standards are AC/DC thermal voltage and current transfer standards, the optical power standard is a calorimeter, the optical wavelength standard is a frequency-stabilized He-Ne laser, the pressure standard is a deadweight pressure balance, and the temperature standards are a Pt-Co RTD, SPRT and R-thermocouple. Measurement traceability is maintained by means of periodical calibration. Yokogawa Electric Corporation is an accredited calibration service provider in the categories "Electrical" and "Pressure" of the Japan Calibration Service System, a measurement law-based traceability system introduced in 1993.