Abstract
An apparatus realized at VNIIFTRI is presented, combining the possibility of thermometer calibration and fixed point measurements, which has a number of additional unique features generally not available at all in any other previous calibration apparatus: it is self-contained, i.e., it does not require any further apparatus or instrument outside a normal storage dewar (for liquid nitrogen or helium) with a Ø50 mm neck, where the cryogenic module is inserted; it requires only initial roughing vacuum pumping, without any permanent pumping during operation which can last up to several weeks continuously over the 24 hours; it has a built-in 4He evaporation refrigerator for one-shot operation below 4.2 K, each shot lasting one working day; it is fully automated through an interactive software user interface, can be run on any inexpensive PC and is fully compatible, for data reduction, with most popular commercial packages; it has an intrinsic accuracy up to ± 1 mK in the full temperature range. Measurement results performed at IMGC are reported, on the calibration of precision and middle-quality thermometers, and on the measurement of ITS-90 fixed points in self-contained permanent IMGC sealed cells.
Partially funded by Contract CERN N° CA 1051884.
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© 1996 Plenum Press, New York
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Pavese, F., Malyshev, V.M., Steur, P.P.M., Ferri, D., Giraudi, D. (1996). Routine Calibration of Cryogenic Thermometers in the Range 1.5–350K with an Accuracy up to the Millikelvin Level, and Measurement of Fixed Points in Sealed Cells with a Fully Automated and Self-Contained Modular Apparatus. In: Kittel, P. (eds) Advances in Cryogenic Engineering. A Cryogenic Engineering Conference Publication, vol 41. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0373-2_211
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DOI: https://doi.org/10.1007/978-1-4613-0373-2_211
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