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Electrode integrity checking

  • US 6,392,416 B1
  • Filed: 08/10/2000
  • Issued: 05/21/2002
  • Est. Priority Date: 12/24/1997
  • Status: Expired due to Fees
First Claim
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1. A method of obtaining an in situ measure of impedance between potential sensing electrodes of a meter having a high input impedance, the method comprising applying a substantially linear voltage ramp waveform to a capacitor coupled to one of the electrodes to generate a substantially constant current, and deriving a measure of impedance by comparing a potential developed across the electrodes while the constant current is flowing to a potential developed across the electrodes when no current, or a different current, is flowing.

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