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Related Concept Videos

Wheatstone Bridge01:29

Wheatstone Bridge

An ohmmeter is a resistance-measuring device. It works by applying a voltage to a resistor of unknown resistance and measuring the current across the resistor. The resistance value is deduced using Ohm's law. Usually, the standard configuration of an ohmmeter comprises a voltmeter or an ammeter. However, such configurations are limited in accuracy because the meters alter the voltage applied to the resistor and the current that flows through it.
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A Strain Gauge Monitor (SGM) for Continuous Valve Gape Measurements in Bivalve Molluscs in Response to Laboratory Induced Diel-cycling Hypoxia and pH
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A simple ac bridge for detecting small resistance change.

Xiaohui Song1, Yirong Jin, Xin Zhang

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. xhsong@aphy.iphy.ac.cn

The Review of Scientific Instruments
|September 4, 2009
PubMed
Summary

A novel AC resistance bridge offers high stability for detecting minute resistance changes. Its performance is validated by magnetoresistance measurements on a gold film.

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Metrology

Background:

  • Accurate resistance measurement is crucial for material characterization.
  • Existing bridges may lack the stability required for detecting subtle resistance variations.

Purpose of the Study:

  • To propose a simple AC resistance bridge with enhanced stability.
  • To demonstrate its suitability for sensitive resistance change detection.

Main Methods:

  • Design and construction of a simple AC resistance bridge.
  • Evaluation of bridge stability.
  • Application in magnetoresistance measurements of a thin gold film.

Main Results:

  • Achieved stability better than 10^-6.
  • Successfully detected tiny resistance changes.
  • Demonstrated good performance in magnetoresistance measurements.

Conclusions:

  • The proposed AC resistance bridge provides a stable and effective platform for precise resistance measurements.
  • The design is well-suited for applications requiring high sensitivity, such as magnetoresistance studies.