Zero-shift values of automatic and inexpensive strain-gage instrumentation systems

P. Cappa, K. G. McConnell, L. W. Zachary

Research output: Contribution to journalArticlepeer-review


Computer-controlled data-acquisition systems are being used extensively for gathering strain-gage data. This paper explores the relative merits of using modern solidstate digital multi-meters (DDM) to measure the strain-gage resistance directly rather than using a conventional Wheatstone bridge. Both a direct-resistance measurement scheme and a reversed current scheme are compared over long measurements terms of 6 and 12 days using a 6 1/2-digit multimeter. The results show that the reversed current method is superior in maintaining the zero-gage resistance reading at the cost of using several meters. Possibly the direct-resistance method can be improved so that the operation and equipment can be simplified.

Original languageEnglish
Pages (from-to)88-92
Number of pages5
JournalExperimental Mechanics
Issue number1
Publication statusPublished - Mar 1991

ASJC Scopus subject areas

  • Mechanics of Materials
  • Computational Mechanics


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