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General purpose potentiostatic test system using a multiplexer for test electrode selection

  • US 4,772,851 A
  • Filed: 07/17/1986
  • Issued: 09/20/1988
  • Est. Priority Date: 01/28/1986
  • Status: Expired due to Fees
First Claim
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1. An apparatus to provide bipolar potentiostatic control of test electrodes, said test electrodes forming part of an electrical potentiostatic circuit having an auxiliary electrode and reference electrode wherein said electrodes are immersed in an electrolyte, comprising:

  • potential supply means for providing an adjustable set potential to said potentiostatic circuit;

    buffer means connected to said reference electrode and said potential supply means to provide a first and second buffered signal;

    adding means for adding said first and second buffered signals to obtain a computed potential;

    driver means for maintaining said test electrodes at said computed potential by controlling the current flow between said test electrodes and said auxiliary electrode;

    measuring means to determine the value of said adjustable set potential and said current flow wherein the value of said current flowing is indicative of the corrosive action affecting said test electrodes,said measuring means including multiplexer means coupled to said driver means for selecting a test electrode to be tested and for sampling the current flowing to said selected test electrode and means for directing the sampled test electrode current to said selected test electrode; and

    display means for displaying said adjustable set potential and said current flowing through said test electrodes.

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