Method and apparatus for measuring an unknown voltage, and power meter employing the same
US5256979A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 21, 1992 |
| Grant date | Oct 26, 1993 |
| Priority date | — |
| Expiry date | Feb 21, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for measuring an unknown voltage (V.sub.IN) using a voltage divider network in such a way that uncertainties in the values of the resistances do not affect the measurement. The unknown voltage is divided into three fractional voltages, the fractional voltages are measured, and the unknown voltage is computed on the basis of the fractional voltages. The unknown voltage is divided with a voltage divider comprising first, second and third resistors, and a first voltage (V.sub.o1) is measured across the first resistor, a second voltage (V.sub.o2) is measured across the second resistor and a third voltage (V.sub.o3) is measured across the third resistor. The unknown voltage V.sub.IN is computed in accordance with the equations disclosed in the specification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.