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      Electrochemical Impedance Spectroscopy (EIS) has
      become a standard technique in the electrochemists’
      toolbox providing detailed information over very wide
      time scales and amplitudes. Commercial instruments
      are available that can measure impedances from m?
      to T? and over frequencies from μHz to MHz.
      Most commonly, EIS is measured using a “single-sine”
      method where individual frequencies are measured
      sequentially. One disadvantage of single-sine EIS is
      the time it takes to acquire a full spectrum. A
      complete sine wave cycle takes ~17 min at 1 mHz
      and ~27 hrs for 10 μHz. This disadvantage can be
      overcome by measuring multiple frequencies at the
      same time (akin to Fourier transform spectroscopy
      This application note discusses the use of multiple sine
      wave excitation in EIS and its implementation in
      Gamry Instrument software. It does not cover the
      basics of EIS which are described in the application
      note ”Basics of Electrochemical Impedance

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