Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Thermal
Patent
1989-06-29
1990-02-13
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Thermal
136207, 324132, G01R 522, H01V 132
Patent
active
049010069
ABSTRACT:
A method and apparatus for the comparision of AC signals by electrothermal means in which both signals are applied to an electrothermal converter, such as a thermocouple converter or a thermoresistive converter, and the temperature produced by the signals is converted to a difference signal. The DC component of the difference signal is used to maintain the electrothermal converter at a stable operating temperature. The AC component of the difference signal is used to indicate the difference between two signals when used as a comparator, to control the amplitude of a reference standard's output when used as a voltmeter or calibration standard, and also to control the amplitude of an oscillator when used as a calibration standard.
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Harrison, Jr. Archie J.
Katzmann Fred L.
Electro Scientific Industries Inc.
Karlsen Ernest F.
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