Eddy current decay resistivity measurements using a digital voltmeter Academic Article uri icon


  • A digital voltmeter is shown to successfully capture the voltage decay signal during eddy current decay (ECD) measurements at cryogenic temperatures on low-resistivity specimens. The use of a voltmeter simplifies ECD measurements, typically made using a digital oscilloscope. An added benefit of using a voltmeter is that under certain circumstances, measurement precision exceeds that which is normally obtained with a preamplifier-digital oscilloscope combination. Results indicate that the best combination of instruments for capturing extremely weak signals (i.e., those with long exponential time constants) is a preamplifier-voltmeter configuration. Results of a comparative study using a preamplifier-digital oscilloscope configuration, a digital voltmeter alone and a preamplifier-digital voltmeter arrangement are presented and discussed.

author list (cited authors)

  • Hua, C. Y., McDonald, L. C., & Hartwig, K. T.

publication date

  • January 1997