Method and apparatus for scale calibration and weighing
US4909338A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1989 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Jun 12, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01G23/01
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A scale utilizes a plurality of load cells positioned beneath a weighing platform for determining the weight of objects placed upon the platform. During a weighing operation, each load cell generates a voltage proportional to the response of said cell to the application of a weight to the platform. Each such generated voltage is transmitted serially through a multiplexer and is converted to a digital value by an analog-to-analog converter. These digital values are employed by a microprocessor to determine the weight of the object placed on the weighing platform. The scale is calibrated by weighing a test weight in a plurality of different locations on the weighing platform, and utilizing the individual digital values thus obtained for each load cell in a plurality of simultaneous equations, which are then solved in the microprocessor to provide constant values associated with each load cell, which are used in subsequent weighing operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.