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

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2 Author(s)
Amagai, Y. ; Nat. Metrol. Inst. of Japan (NMIJ), Nat. Inst. of Adv. Ind. Sci. & Technol. (AIST), Tsukuba, Japan ; Nakamura, Y.

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.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:61 ,  Issue: 3 )