Resistance bridge based on the cryogenic current comparator in a transport dewar

Author

Bartolomé, E. ; Camón, A. ; Sesé, J. ; Rillo, C. ; Flokstra, J. ; Rietveld, G. ; Rogalla, H.

Author_Institution

Dept. of Appl. Phys., Twente Univ., Enschede, Netherlands

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

867

Lastpage

870

Abstract

An optimized resistance bridge based on the Cryogenic Current Comparator (CCC) with SQUID readout has been developed. The bridge can be used for routine secondary resistance calibrations as well as for the traceability of 100 Ω to the quantum Hall resistance. The CCC-SQUID, shielding and wiring are mounted in a telescopic insert, fitted in a low-evaporation rate, transportable liquid He dewar, with an autonomy of around 1 month. A difference compensator method is used to balance the bridge. A new, more reliable and self-standing bridge electronics has been fabricated and tested. An uncertainty in the comparison of resistors at least one order of magnitude better than room temperature CCs is expected

Keywords

SQUIDs; bridge instruments; calibration; cryogenic electronics; current comparators; electric resistance measurement; readout electronics; 100 ohm; SQUID readout electronics; cryogenic current comparator; difference compensator; electrical quantum metrology; quantum Hall resistance; resistance bridge; secondary resistance calibration; transport liquid He dewar; Automatic testing; Bridges; Calibration; Cryogenics; Electronic equipment testing; Helium; Resistors; SQUIDs; Uncertainty; Wiring;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919482

Filename

919482