Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Inertia control – instrument damping and vibration damping
Patent
1989-06-05
1990-06-12
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Inertia control, instrument damping and vibration damping
324152, 324155, 324156, G01R 102, G01R 114
Patent
active
049336320
ABSTRACT:
An apparatus for ferromagnetic measurements of electric quantities comprises a coil having a hollow barrel on which a winding of a conductive wire is formed. A unit which is integral with a needle is positioned in the barrel. The needle is displaced in front of a graduated dial between a zero value and a maximum value. The movable unit is formed integrally with a first metallic plate which is displaced, in the course of the measurement of an electrical quantity, relative to a second metallic plate which is fixed in the hollow barrel of the coil, as a function of the magnetic field created by the winding. At least one additional metallic plate is fixed in the hollow barrel of the coil, in such a manner as to cooperate with the movable plate to generate therewith a repulsive force in order to brake the pivoting of the pivotable unit when the electrical quantity to be measured tends to displace the needle of the movable unit beyond the maximum value of the graduation.
REFERENCES:
patent: 2353618 (1944-07-01), Lamb
patent: 2515375 (1950-07-01), Kelly
patent: 2668945 (1954-02-01), Pfeffer
patent: 2708737 (1955-05-01), Skidmore
patent: 3713024 (1973-01-01), Banus
Jaillant Gabriel
Palencher Jacques
Eisenzopf Reinhard J.
Harvey Jack B.
Radio Controle S.A.
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