Improvements in the Nist Calibration Service for Thermal Transfer Standards

We report on multiple improvements made in the calibration services offered for thermal converters and thermal transfer standards in the ac-dc Difference Standards and Measurement Techniques Project at NIST during the past year. The major improvement in this calibration is the increased efficiency made possible by the consolidation of three disparate calibration services – low voltage thermal transfer standards, lowfrequency thermal converters, and RF-dc difference calibrations – into a single service. This consolidation has the immediate benefit of offering NIST calibration customers one source for ac-dc calibrations from 2 mV to 1000 V and from 10 Hz to 1 GHz. Additional benefits include lower calibration prices and reduced uncertainties at many points.