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Method and circuit for extending the range of a cold cathode discharge vacuum gauge

  • US 4,967,157 A
  • Filed: 08/29/1988
  • Issued: 10/30/1990
  • Est. Priority Date: 08/29/1988
  • Status: Expired due to Term
First Claim
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1. A cold cathode ionization gauge controller for measuring the pressure of a gas comprising:

  • means for measuring the electrical resistance of a cold cathode ionization gauge in communication with the gas where said measuring means includes means for measuring the current through the gauge and means for measuring the voltage across the gauge and means for dividing the measured voltage by the measured current to obtain said electrical resistance; and

    means for translating said electrical resistance to said pressure of the gas.

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