Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With waveguide or long line
Patent
1982-08-31
1985-10-15
Levy, Stewart J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With waveguide or long line
324 99R, 324119, G01R 2104
Patent
active
045477280
ABSTRACT:
An RF wattmeter is disclosed of the type using an "insertion-type" pick-up element to produce a voltage wave signal corresponding to the measured power in the coaxial transmission line. The induction loop in the pick-up element is connected to a principal detector, and a secondary detector is connected in opposition to the principal detector. Both detectors are located in close proximity to each other and are subject to the same thermal environment. A sine wave generator supplies a wave signal to the secondary detector in opposition to the wave signal supplied to the principal detector from the inductive loop. The d.c. portion of the resulting signal representing the difference between the opposed signals is integrated, and the integrated output is used as the amplitude in the generated sine wave. When the circuit is in balance, the integrated output matches the amplitude of the inductive wave form and can be used as an output indicating measured power in the coaxial transmission line.
REFERENCES:
patent: 3142799 (1964-07-01), Kovalevski
patent: 4080566 (1978-03-01), Mecklenburg
patent: 4359682 (1982-11-01), Winslow
News From Rhode & Schwarz 60, Burkhart, D., "Directional Power Meter NAUS", vol. 13, 1973, pp. 13-15.
Baker S.
Bird Electronic Corporation
Levy Stewart J.
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