Abstract
The authors present a compact setup for quantum Hall measurements consisting of an overlapped-tube cryogenic current comparator, where the imbalance is detected with a sensitive DC-SQUID (superconducting quantum interference device) magnetometer, and a small superconducting magnet system operated in a standard liquid-helium storage dewar. The system also incorporates PC-controlled electronics, which facilitates automatic measurements. The setup has been developed for a small-scale national standards laboratory where resistance calibrations at an uncertainty level of 10/sup -8/ are performed. A block diagram of the electronics of the measurement setup is shown along with a 1.5 K insert that includes a complete superconducting magnet system and the quantum-Hall probe.
Original language | English |
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Title of host publication | CPEM'90 Digest |
Subtitle of host publication | Conference on Precision Electromagnetic Measurements |
Editors | Gary R. Hanes |
Place of Publication | New York |
Publisher | IEEE Institute of Electrical and Electronic Engineers |
Pages | 352-353 |
DOIs | |
Publication status | Published - 1990 |
MoE publication type | A4 Article in a conference publication |
Event | CPEM'90: Conference on Precision Electromagnetic Measurements - Ottawa, Canada Duration: 11 Jul 1990 → 14 Jul 1990 |
Conference
Conference | CPEM'90 |
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Country/Territory | Canada |
City | Ottawa |
Period | 11/07/90 → 14/07/90 |