Journal Published Online: 01 January 1997
Volume 25, Issue 1

Eddy Current Decay Resistivity Measurements Using a Digital Voltmeter



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 Information

Hua, CY
General Research Institute for Non-Ferrous Metals, Beijing, China
McDonald, LC
Rimkus Consulting Group, Inc., Houston, TX
Hartwig, KT
Texas A & M University, College Station, TX
Pages: 8
Price: $25.00
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Stock #: JTE11323J
ISSN: 0090-3973
DOI: 10.1520/JTE11323J