The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 30, 2004
Filed:
Apr. 04, 2002
Koichi Nakano, Nishinomiya, JP;
Hokuto Electronics Incorporated, Hyogo, JP;
Abstract
It is possible to avoid the effects of floating capacitance, and to measure a voltage with a simple operation and in a non-contact manner, without measuring the floating capacitance. A measurement method for measuring an AC voltage applied to a conductor, without contacting the conductor, using a detection probe, provided with a detection electrode capable of covering part of a surface of insulation for insulating the conductor and a shield electrode for covering the detection electrode, and an oscillator for outputting a signal having a certain frequency, wherein one end of each of a core wire and a sheath wire of a shield cable are connected to the detection electrode and the shield electrode, and a floating capacitance effect is substantially made zero by establishing an imaginary short-circuit state between each of the other ends, the measurement method comprising the steps of measuring impedance between the detection electrode and the conductor by applying the signal from an oscillator to the detection electrode via the shield cable, measuring a current discharged from the detection electrode attributable to the voltage applied to the conductor, and obtaining the applied voltage based on the measured impedance and current.