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RN30 - New PTB Calibration Service for dc SQUID-based Noise Thermometers to Disseminate PLTS-2000

New PTB Calibration Service for dc SQUID-based
Noise Thermometers to Disseminate PLTS-2000

J. Engert1, J. Beyer1, M. Schmidt1, S. Ali Valiollahi2, H.-J. Barthelmess2 and Th. Schurig1

1Physikalisch-Technische Bundesanstalt (PTB), Abbestr. 2-12, 10587 Berlin, Germany
2MAGNICON GmbH, Lemsahler Landstr. 171, 22397 Hamburg, Germany

E-mail: jost.engert@ptb.de

Abstract - The Physikalisch-Technische Bundesanstalt has started a new calibration service for dc SQUID based noise thermometers according to the PLTS-2000. The thermometers are easy-to use, compact, robust and allow temperature measurements with less than 1% uncertainty in short times in the temperature range from 1 K down to the millikelvin region. New developments in low-temperature thermometry are briefly discussed.

Keywords - Noise thermometry, temperature scales, dc SQUID, magnetic gradiometer, calibration service

Submitted January 14, 2014, accepted January 16, 2014.  Reference No. RN30; Category 4.