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: [email protected]

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.