Potential fixing device, potential fixing method, and capacitance measuring instrument
US7046016B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 22, 2002 |
| Grant date | May 16, 2006 |
| Priority date | — |
| Expiry date | Oct 22, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R27/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electric potential fixing apparatus is provided that can prevent the combined total amount of electricity of a connection line between the first capacitance and the second capacitance from changing even when the electric potential of the connection line between the first capacitance and the second capacitance is fixed in the case where the first capacitance and the second capacitance are directly connected.This electric potential fixing apparatus has the first high resistance (3) and the second high resistance (4) and includes a voltage supply circuit (1) that preserves the combined total amount of electric charge of a measuring capacitance (14) and a fixed capacitance (15) and maintains constant the electric potential of a signal line (17) that connects the measuring capacitance (14) and the fixed capacitance (15). And an output terminal (5) of the voltage supply circuit (1) is connected to the signal line (17).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.