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 |
|---|---|
| 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 |
|---|---|
| Country | Canada |
| City | Ottawa |
| Period | 11/07/90 → 14/07/90 |
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Cite this
Varpula, T., & Seppä, H. (1990). VTT QUANTUM-hall setup. In G. R. Hanes (Ed.), CPEM'90 Digest: Conference on Precision Electromagnetic Measurements (pp. 352-353). IEEE Institute of Electrical and Electronic Engineers. https://doi.org/10.1109/CPEM.1990.110056