D Drung et al 2009 Supercond. Sci. Technol. 22 114004 doi:10.1088/0953-2048/22/11/114004
D Drung1, M Götz2, E Pesel2, J-H Storm1, C Aßmann1, M Peters1 and Th Schurig1
Show affiliationsWe have realized an improved resistance calibration setup based on a cryogenic current comparator (CCC). The comparator, with 18 windings and 4647 turns in total, is well-suited for all the necessary comparisons with a 100 Ω standard resistor with the quantum Hall effect and inside the range of standard resistance values from 1 Ω to 1 MΩ. The new state-of-the-art setup is equipped with a low-noise dc SQUID (superconducting quantum interference device) and a digital double current source. Proper damping of the CCC resonance, careful electronics design ('box-in-box') and application of internal wideband feedback to the SQUID sensor improve the dynamic stability considerably and lower the overall measurement time as compared against our previous setup.
85.25.Dq Superconducting quantum interference devices (SQUIDs)
06.20.fb Standards and calibration
07.20.Mc Cryogenics; refrigerators, low-temperature equipment
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
Issue 11 (November 2009)
Received 14 June 2009, in final form 20 August 2009
Published 20 October 2009
D Drung et al 2009 Supercond. Sci. Technol. 22 114004
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