Span adjusting system of electronic weighing apparatus
AssigneeKabushiki Kaisha Ishida Koki Seisakusho
InventorKazufumi Naito
Life of this patent
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Abstract
There is provided a system for adjusting the span of an electronic scale having a double-integrating A/D converter for converting a weight signal into a digital signal. The double-integrating A/D converter has a software-implemented timer for controlling a primary integrating time. The operation time of the software-implemented timer is adjusted linearly or in steps so that a digital value at the time a weight is placed on the scalepan of the scale will correspond to the weight. The adjustment of the operation time of the software-implemented timer is utilized to adjust the differences between gravitational accelerations corresponding to different weights in geographical areas on the earth.
Claims11
A system, for adjusting the span of an electronic scale, having a double-integrating A/D converter for converting a weight signal into a digital signal, said system comprising:
- a control unit, operatively connected to the double-integrating A/D converter, having a software-implemented timer for controlling a primary integrating time of the double-integrating A/D converter;
- and
- adjusting means, operatively connected to said control unit, for adjusting an operation time of said software-implemented timer.
A system, for adjusting the span of an electronic scale, having a double-integrated A/D converter for converting a weight signal into a digital signal, said system comprising:
- display means, operatively connected to the double-integrating A/D converter, for displaying a digital signal produced by the double-integrating A/D converter;
- a control unit, operatively connected to the double-integrating A/D converter, having a software-implemented timer for controlling a primary integrating time of the double-integrating A/D converter;
- and
- adjusting means, operatively connected to said control unit, for adjusting an operation time of said software-implemented timer.
A system, for adjusting the span of an electronic scale, having a double-integrating A/D converter for converting a weight signal into a digital signal, said system comprising:
- a control unit, operatively connectable to the double-integrating A/D converter, having a software-implemented timer for controlling an integrating time for integrating the weight signal;
- setting means, operatively connected to said control unit, for applying a signal to said software implemented timer to stepwise change an operation time from said software-implemented timer of said control unit;
- and
- a variable resistor, operatively connected to the double-integrating A/D converter, for continuously adjusting a reference voltage of the double-integrating A/D converter.
A system, for adjusting the span of an electronic scale, having a double-integrating A/D converter for converting a weight signal into a digital signal, said system comprising:
- a control unit, operatively connectable to the double-integrating A/D converter, having a software-implemented timer for controlling an integrating time for integrating the weight signal;
- setting means, operatively connected to said control unit, for applying a signal to said software implemented timer to stepwise change an operation time from said software-implemented timer of said control unit;
- and
- a variable resistor, operatively connected to the double-integrating A/D converter, for continuously adjusting an input voltage applied as the weight signal to the double-integrating A/D converter.
A system, for adjusting the span of an electronic scale, having a double-integrating A/D converter for converting a weight signal into a digital signal, said system comprising:
- a memory for storing a digital value indicative of the weight of a weight;
- a control unit including:
- a software-implemented timer, operatively connected to the double-integrating A/D converter, for controlling a primary integrating time of the double-integrating A/D converter;
- and
- adjusting means, operatively connected to said memory, the double-integrating A/D converter and said software implemented timer, for reading the digital value from said memory, comparing the read digital value with an output value from the double-integrating A/D converter at the time a weight is placed on a scalepan of the electronic scale, and adjusting an operation time of said software-implemented timer so that the compared values will be equal to each other;
- and
- a span command switch, operatively connected to said adjusting means, for commanding operation of said adjusting means.
A system, for adjusting the span of an electronic scale, having a double-integrating A/D converter for converting a weight signal into a digital signal, said system comprising:
- a sofware-implemented timer, operatively connectable to the double-integrating A/D converter, for controlling an integrating time for integrating an input signal;
- a control unit, operatively connectable to the double-integrating A/D converter and to said software implemented timer, having control means for controlling an operation time of said software-implemented timer;
- a memory, operatively connected to said software implemented timer, for storing operation times of said software-implemented timer corresponding to respective gravitational accelerations so that the span of the electronic scale remains constant;
- and
- area indicating means, operatively connected to said memory, for indicating areas corresponding to the operation times stored in said memory for the respective gravitational accelerations.
A system for adjusting the span of an electronic scale, operatively connected to receive a weight signal, said system comprising:
- a double-integrating A/D converter for integrating the weight signal;
- a control unit, operatively connected to said double-integrating A/D converter, having a software implemented timer for controlling an integrating time for integrating the weight signal;
- and
- setting means, operatively connected to said control unit, for applying a signal to stepwise change an operation time of said software implemented timer.
A span adjusting system, operatively connected to receive a weight signal and a reference voltage, comprising:
- a double-integrating A/D converter operatively connectable to receive the reference voltage;
- a control unit, operatively connected to said double-integrating A/D converter, having a software-implemented timer for controlling an integrating time for integrating the weight signal;
- setting means, operatively connected to said control unit, for applying a signal to stepwise change an operation time of said software implemented timer;
- and
- a variable resistor, operatively connected to said double-integrating A/D converter, for continuously adjusting the reference voltage of said double-integrating A/D converter.
Dependencies are inferred from the claim text.