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Keywords:

  • Portable instrumentation;
  • Ambulatory monitoring;
  • Skin conductance measurement

ABSTRACT

The design of instrumentation for the ambulatory measurement of skin conductance (SC) is discussed. Two problems which are frequently encountered concern size constraints and the provision of a sufficient dynamic range. A circuit description which overcomes these problems is given along with details of its construction. This device utilises an AC-coupled amplifier stage for Skin Conductance Responses (SCRs) and a DC-coupled amplifier stage for Skin Conductance Level (SCL). Its use in conjunction with a portable instrumentation cassette recorder is described.