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Capacitance measurement

  • US 5,136,251 A
  • Filed: 01/31/1991
  • Issued: 08/04/1992
  • Est. Priority Date: 09/23/1988
  • Status: Expired due to Term
First Claim
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1. A method for measuring the value of a capacitor comprising the steps of:

  • at least partially discharging said capacitor and measuring the initial voltage across said capacitor,cyclically charging said capacitor over a sequence of cycles during each of which a separate charging current is supplied to said capacitor until over the sequence of cycles said capacitor reaches a predetermined proportion of possible charge,integrating the currents supplied to said capacitor during said sequence of cycles to provide a value proportional to the actual charge delivered to said capacitor,measuring the final voltage on said capacitor, anddividing said value proportional to actual charge on said capacitor by the difference between the final and initial voltages across said capacitor to provide a measure of the capacitance of said capacitor.

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