RECENT IMPROVEMENTS AND REVISED UNCERTAINTIES IN THE NIST AC-DC DIFFERENCE CALIBRATION SERVICE FOR THERMAL TRANSFER STANDARDS

摘要

This paper describes recent developments in the ac-dc difference calibration service for thermal transfer standards at the National Institute of Standards and Technology. Related developments include the revision of calibration uncertainties, with substantial reductions at many points, and an expansion of the calibration parameter space for thermal current converters and shunts. New research programs include a prototype thermal transfer standard using a superconducting temperature sensor.