IR Corrected electrochemical cell test instrument
First Claim
1. A test instrument for use with an electrochemical cell, comprising:
- control means attached to said electrochemical cell for generating a current to cause the current in said electrochemical cell to be interrupted for a predetermined length of time;
means connected to said control means for sampling the voltage level of said electrochemical cell during said predetermined period and for holding said voltage level;
whereby said held voltage level is indicative of the voltage of said electrochemical cell in the absence of IR polarization.
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Abstract
A test instrument for an electrochemical cell generates a current which counteracts the cell current so that it is briefly reduced to zero thereby allowing the electrode potential or cell potential to be measured free from the IR or ohmic polarization loss. A sample and hold circuit is enabled shortly after the current is interrupted to sense the voltage level of the electrode or electrochemical cell which has only experienced the voltage change due to the IR polarization losses. When cell current is restored, the IR corrected potential stored in the sample and hold circuit is compared to the control potential, and the difference between the two causes automatic adjustment of the average cell current such that the IR corrected potential of the cell is maintained despite any changes in IR polarization.
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Citations
6 Claims
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1. A test instrument for use with an electrochemical cell, comprising:
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control means attached to said electrochemical cell for generating a current to cause the current in said electrochemical cell to be interrupted for a predetermined length of time; means connected to said control means for sampling the voltage level of said electrochemical cell during said predetermined period and for holding said voltage level; whereby said held voltage level is indicative of the voltage of said electrochemical cell in the absence of IR polarization. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification