Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With voltage or current conversion
Patent
1996-04-24
1998-06-09
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With voltage or current conversion
324 99D, G01R 1918, G01R 1706
Patent
active
057640483
ABSTRACT:
An ultra high accuracy voltage measurement system utilizes a Josephson junction voltage generator whose voltage is controlled by a high precision frequency. The voltage measurement system to measure an input DC voltage incudes: a microwave oscillator which generates a microwave signal whose frequency is variable by a voltage applied thereto; an atomic frequency standard which generates a standard frequency signal with extremely high accuracy and stability; a frequency synthesizer which synthesizes a frequency signal based on the atomic frequency standard; a phase lock loop for synchronizing the microwave signal with the frequency signal from the frequency synthesizer; a Josephson junction voltage generator which is soaked with liquid helium and generates a standard voltage determined by the frequency and a power level of the microwave signal; a bias circuit for supplying a bias current to the Josephson junction voltage generator; a switch group for alternately changing polarities of the input voltage and the standard voltage; a difference detector for detecting a voltage difference between the input voltage and the standard voltage; a feedback circuit to control the frequency of the microwave signal through the phase lock loop so that the voltage difference is canceled; and a system controller to control an overall operation of the voltage measurement system.
REFERENCES:
patent: 3761798 (1973-09-01), Silver
patent: 4468635 (1984-08-01), Lukens et al.
patent: 4605897 (1986-08-01), Gelinas
patent: 4866373 (1989-09-01), Harada et al.
Advantest Corp.
Karlsen Ernest F.
Phung Anh
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