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Precision high-value resistance scaling with a two-terminal cryogenic current comparator.
F L Hernandez-Marquez1, M E Bierzychudek2, G R Jones3
1Centro Nacional de Metrología, Querétaro 76900, Mexico.
The Review of Scientific Instruments
|May 3, 2014
Summary
A new cryogenic bridge precisely scales resistance from quantum standards to high values (1 MΩ–1 GΩ). This method improves accuracy by minimizing errors, offering a stable alternative to conventional techniques.
Area of Science:
- Metrology
- Electrical Engineering
- Quantum Physics
Background:
- Accurate high-resistance standards are crucial for metrology.
- Scaling resistance from quantum Hall effect (QHE) to higher values presents challenges.
- Conventional cryogenic current comparators (CCCs) can have limitations in dynamic stability for low-current measurements.
Purpose of the Study:
- To develop and present a novel cryogenic two-terminal high-resistance bridge.
- To enable precise resistance scaling from the quantized Hall resistance (QHR) to decade resistance standards.
- To improve dynamic stability in high-resistance measurements.
Main Methods:
- Utilized a cryogenic two-terminal bridge design.
- Minimized lead resistance errors through multiterminal connections to the QHR device.
- Employed a single variable voltage source and resistive ratio windings for stability.
Main Results:
- Successfully scaled resistance from QHR (RK/2) to standards between 1 MΩ and 1 GΩ.
- Achieved excellent dynamic stability, surpassing conventional CCCs in certain applications.
- Demonstrated the bridge's effectiveness through international comparisons.
Conclusions:
- The developed cryogenic bridge offers a reliable method for high-resistance scaling.
- The design provides enhanced dynamic stability and reduced lead resistance errors.
- This technique is validated by international metrology comparisons.
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