Non-contact voltage measurement method and device, and detection probe
US6825649B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 4, 2002 |
| Grant date | Nov 30, 2004 |
| Priority date | — |
| Expiry date | Apr 4, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/312
- WIPO fieldMeasurement
- WIPO sectorInstruments
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 volta…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.