Weighing scales – Computer – Electrical
Patent
1994-03-01
1997-04-22
Spyrou, Cassandra C.
Weighing scales
Computer
Electrical
177211, 177229, 73862627, 73862623, G01G 1922, G01G 314, G01G 308
Patent
active
056231288
ABSTRACT:
A digital load cell includes an EEPROM that is permanently attached to the counterforce along with a temperature sensor and a plurality of strain gages. The strain gages are mounted on the counterforce in the electrical configuration of a full wheatstone bridge. The EEPROM and bridge are connected to a flexible circuit that is detachably connectable in electrical communication with circuits including a processor and an analog-to-digital converter, which can be mounted permanently on a local circuit board physically separated from the EEPROM. The local circuit board operates in a manner so that the EEPROM can be programmed to store the calibration/correction factors that are to be applied by the processor to the digital weight signals from the analog-to-digital converter. The local circuit board is associated with, and alternatively can be removably attachable to, the counterforce.
REFERENCES:
patent: 4520339 (1985-05-01), Utsunomiya
patent: 4653599 (1987-03-01), Johnson
patent: 4718287 (1988-01-01), Mishliborsky
patent: 4747456 (1988-05-01), Kitagawa et al.
patent: 4804052 (1989-02-01), Griffen
patent: 4815547 (1989-03-01), Dillon et al.
patent: 5076375 (1991-12-01), Dillon et al.
Sensor Developments, Inc.; "Applying EPROM Technology to Transducers Simplifies Instrument Calibration"; Spring 1994; pp. 2,3; Innovations in Force Measurement, Issue 18.
Sensor Developments, Inc.; "Recent Developments -SDI's auto-id system"; 1994; p.2; Company Profile.
Grimm Steven R.
Loshbough Richard C.
Gibson Randy W.
Mettler-Toledo, Inc.
Spyrou Cassandra C.
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