Weighing scales – Preset – Responsive to load receiver
Patent
1977-07-29
1978-10-03
Hartary, Joseph W.
Weighing scales
Preset
Responsive to load receiver
177DIG3, 235 92WT, G01G 2314
Patent
active
041178980
ABSTRACT:
An electronic tare system used in an electrical balance of the type which generates an electrical signal representing a mass being weighed for application to a digital read out or other display is capable of bipolar operation over a range much greater than that of the balance by generating and storing a digital value in response to the combined analog signals at an electrical summing junction coupled to receive both the electrical signal from the balance and an analog electrical signal generated from the stored digital value. An up-down counter coupled through a digital-to-analog converter to the summing junction counts in response to the output of a high gain amplifier coupled in a feedback loop to the output of the summing junction during the first portion of a tare mode of operation until the output of the digital-to-analog converter to the summing junction effectively equals and nulls the signal from the balance. Thereafter, the count stored in the counter which represents the weight of a sample holder on the balance is converted into an analog electrical signal which is subtracted from the signal from the balance representing the combined weight of the sample holder and a sample therein with the difference therebetween being applied to the digital read out to indicate the weight of the sample.
REFERENCES:
patent: 3812923 (1974-05-01), Rock
patent: 3888321 (1975-06-01), Wiiki
Hartary Joseph W.
Ventron Corporation
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