Method and apparatus for measuring complex self-immitance of a general electrical element

  • US 6,294,896 B1
  • Filed: 11/10/2000
  • Issued: 09/25/2001
  • Est. Priority Date: 09/11/1998
  • Status: Expired due to Term
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First Claim
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1. Apparatus for evaluating at least one component of complex self-immittance of an electrical element at a discrete frequency comprising:

  • excitation circuitry adapted to excite said element with periodic excitation characterized by a fundamental period equal to the reciprocal of said discrete frequency;

    excitation signal sense and process circuitry adapted to provide an excitation signal in accordance with said periodic excitation;

    response signal sense and process circuitry adapted to provide a response signal in accordance with a periodic response of said electrical element to said periodic excitation;

    excitation signal sample and convert circuitry adapted to provide digital representations of sampled values of said excitation signal, said sampled values acquired at discrete excitation signal sampling times synchronized with said periodic excitation and distributed in time over one or more half-period or full-period intervals of said fundamental period;

    response signal sample and convert circuitry adapted to provide digital representations of sampled values of said response signal, said sampled values acquired at discrete response signal sampling times synchronized with said periodic excitation and distributed in time over one or more half-period or full-period intervals of said fundamental period; and

    , computation and control circuitry adapted to initiate said excitation signal sampling times, to initiate said response signal sampling times, and to numerically combine said digital representations of said sampled values of said excitation signal and said digital representations of said sampled values of said response signal to evaluate at least one said component of said complex self-immittance of said electrical element at said discrete frequency.

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