Load cell type, weight-measuring device
AssigneeTokyo Electric Co., Ltd.
InventorTohru Kitagawa
Life of this patent
Estimating the term…
Abstract
A load cell type, weight-measuring device includes a load cell for generating an electrical signal corresponding to an applied weight, an analog-to-digital converting circuit for converting an output signal from the load cell to a digital data, and a data processing unit for generating weight data on the basis of output data from the A/D converting circuit. This weight-measuring device further has a memory in which data indicative of the temperature characteristic of the output signal of the load cell is stored, and a temperature sensor for detecting the temperature of the load cell and generating a corresponding output signal. The data processing unit corrects the output data from the A/D converting circuit on the basis of the output signal from the temperature sensor and the data in the memory.
Claims5
A load cell type, weight-measuring device, comprising:
- load cell means for generating an electrical signal corresponding to an applied weight;
- analog-to-digital converting means for converting an output signal from said load cell means to a digital data;
- read only memory means in which temperature data indicative of a temperature characteristic of the output signal of said load cell means is stored;
- said read only memory means storing zero point data obtained at least at first and second reference measurement temperatures, and span data obtained at least at said first and said second reference measurement temperatures;
- temperature sensing means for detecting the temperature of said load cell means and generating a corresponding output signal;
- and
- processing means coupled to said analog-to-digital converting means and said read only memory means, for deriving digital data, as weight data, from the digital data from said analog-to-digital converting means in accordance with the output signal of said temperature sensing means and the temperature data in said read only memory means;
- said processing means including means for generating a first characteristic curve defined by the zero point data and the span data both of which data are obtained at said first reference measurement temperature, means for generating a second characteristic curve defined by the zero point data and the span data both of which data are obtained at said second reference measurement temperature, and means for generating a new characteristic curve corresponding to an actual measurement temperature between said first and said second reference measurement temperatures wherein the processing means interpolates the new characteristic curve from said first and said second characteristic curves when the actual measurement temperatures lies between said first and said second reference measurement temperatures.
Dependencies are inferred from the claim text.