Analog multiplier error corrector, notably for precision wattmeters
US4118787A · kind A · utility
14Cited by
6References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 7, 1977 |
| Grant date | Oct 3, 1978 |
| Priority date | — |
| Expiry date | Feb 7, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R21/127
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An error correcting device for a multiplier of the time-division multiplication type comprising a modulator, a switch and a filter. Another switch is responsive to a time-base delivering periodically a zero signal to the modulator; a circuit memorizes and detects the difference between the product xy vitiated by switching and shifting errors and the errors themselves. The memories are of the capacitor and amplifier type, and the subtraction is obtained through the opposite of the voltages of said capacitors. This device is applicable more particularly to high-frequency, wide-range precision wattmeters adapted for d.c. calibration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.