G - Physics – 01 – R
Patent
G - Physics
01
R
324/44
G01R 27/26 (2006.01) G01R 17/10 (2006.01)
Patent
CA 1056457
ABSTRACT OF THE DISCLOSURE Alternating current capacitance measuring bridge for measu- ring the capacitance of capacitors having one electrode connected to an external earth. It comprises a first metal screen box con- nected to the common terminal of the secondary windings of a differential transformer and directly to screened coaxial connec- tions of capacitors inside of which an alternating voltage source and the transformer are placed, and means for d.c. supplying the source via internal d.c. supply terminals comprising a first win- ding connecting to the common terminal of secondary windings and the external earth, a second and third windings connecting to the internal d.c. supply terminals and external d.c. supply terminals, the first, second and third windings having a high impedance at the operational frequency of the source, two capacitors of high impedance inserted between the internal d.c. supply terminals and said first screen box, and tow other capacitors of high impedance inserted between the external d.c. supply terminals and the ex- ternal earth. In addition, the measuring bridge comprises a second metal box screen containing all the elements of the measuring bridge and connected to the external earth. The screened coaxial connections comprise either external conductors connected to the external earth, or internal conductors connected to the first metal screen box and external conductors connected to the exter- nal earth, so as to eliminate mutual capacitance errors coming from induced currents between conductors of the screened coaxial connections.
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