Eddy Current Decay Resistivity Measurements Using a Digital Voltmeter

    Volume 25, Issue 1 (January 1997)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 8


    Hua, CY
    Senior engineer, General Research Institute for Non-Ferrous Metals, Beijing,

    McDonald, LC
    Project consultant, Rimkus Consulting Group, Inc., Houston, TX

    Hartwig, KT
    Associate professor, Texas A & M University, College Station, TX

    (Received 27 November 1995; accepted 29 July 1996)

    Abstract

    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.


    Paper ID: JTE11323J

    DOI: 10.1520/JTE11323J

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    Author
    Title Eddy Current Decay Resistivity Measurements Using a Digital Voltmeter
    Symposium , 0000-00-00
    Committee B01