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Improved Measurement of AC–DC Transfer Difference Using a Low-Drift Single-Junction Thermal Converter | IEEE Journals & Magazine | IEEE Xplore

Improved Measurement of AC–DC Transfer Difference Using a Low-Drift Single-Junction Thermal Converter


Abstract:

We reduced the exponentially decreasing thermal drift of a single-junction thermal converter and performed comparison measurements of the ac-dc transfer difference. The t...Show More

Abstract:

We reduced the exponentially decreasing thermal drift of a single-junction thermal converter and performed comparison measurements of the ac-dc transfer difference. The thermal converter was mounted on a metal block using a high-thermal-conductance paste; this treatment is crucial to improving the thermal drift. Numerical calculations using a thermal model that includes the temperature increase on the cold side of the thermocouple can explain the measured thermal drift. Our system, which uses a low-drift thermal converter, allows comparison measurements of the ac-dc transfer difference at a few parts in 107 with a short measurement time if a sufficiently long waiting time is used.
Published in: IEEE Transactions on Instrumentation and Measurement ( Volume: 61, Issue: 3, March 2012)
Page(s): 786 - 790
Date of Publication: 05 December 2011

ISSN Information:


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