Electronic balance

• US 7,917,329 B2
• Filed: 09/03/2007
• Issued: 03/29/2011
• Est. Priority Date: 09/03/2007
• Status: Expired due to Fees

• Current Assignee: Shimadzu Corporation
• Original Assignee: Shimadzu Corporation
• Inventors: Hamamoto, Hiroshi
• Primary Examiner(s): Bui; Bryan
• Application Number:
  US12/162,049
• Publication Number:
  US 20100228521A1
• Time in Patent Office: 1,303 Days
• Field of Search: 702/173, 702/127, 177/25.19, 173/25.13, 173/25.19
• US Class Current: 702/173
• CPC Class Codes: G01G 23/37 involving digital counting

Abstract

An electronic balance 1 is provided with a measured weight storage controlling portion 33 for storing measured weight in sequence, a measuring mode storing portion 42 for storing a number of measuring modes where different averaging parameters are preset, an input portion for a measuring mode 72 which carries out an input operation for selecting one measuring mode from among a number of measuring modes, and an average weight display controlling portion 31 for calculating the average weight by averaging the number of measured weight on the basis of the averaging parameter in the measuring mode and displays the average weight in a display portion 60, and is characterized in that the electronic balance is further provided with an input portion 71 for making a modification which carries out an input operation for making a modification on the averaging parameter in the selected measuring mode, and the average weight display controlling portion 31 calculates the average weight by averaging the number of measured weight on the basis of the averaging parameter where a modification is made and displays the average weight in the display portion 60.

Claims

1. An electronic balance, comprising:

a measured weight storage controlling portion for controlling a detecting weight of an object in sequence and thus storing the detected measured weight in a measured weight storing portion in sequence;

a measuring mode storing portion for storing a number of measuring modes where different averaging parameters are preset;

an input portion for a measuring mode which carries out an input operation for selecting one measuring mode from among the number of measuring modes stored in said measuring mode storing portion; and

an average weight display controlling portion for calculating average weight by averaging the number of measured weight stored in said measured weight storing portion on the basis of an average parameter in the selected measuring mode and displaying the average weight in a display portion, characterized in that

the electronic balance further comprises an input portion for making a modification which carries out an input operation for making a modification in an average parameter in the selected measuring mode, and

said average weight display controlling portion calculates the average weight by averaging a number of measured weight on the basis of the average parameter where a modification is made and displays the average weight in the display portion.

2. The electronic balance according to claim 1, characterized in that

said averaging parameter is the number of samples which is the number of measured weight on which an averaging process is carried out, and

said average weight display controlling portion improves the stability of the average weight to be displayed when such a modification is made that the number of samples increases using the number of samples in said selected measuring mode as a reference while improving the response of the average weight to be displayed when such a modification is made that the number of samples decreases using the number of samples in said selected measuring mode as a reference.

3. The electronic balance according to claim 1, characterized in that

said average weight display controlling portion calculates a first average weight, which is a moving average of the measured weight of which the number of samples is the number of measured weight on which an averaging process is carried out, in sequence when measured weight is stored in said measured weight storing portion in sequence, and at the same time, stores the first average weight in the average weight storing portion in sequence,

furthermore, calculates a second average weight, which is a moving average of the first average weight of said number of samples in sequence when the first average weight is stored in said average weight storing portion, in sequence, and at the same time, stores the second average weight in the average weight storing portion in sequence, and thus, calculates and stores the mth average weight in sequence,

said averaging parameter has a corresponding set number m in order to display the mth average weight, and

said average weight display controlling portion improves the stability of the average weight to be displayed when such a modification is made that the set number m increases using the set number m in said selected measuring mode as a reference while improving the response of the average weight to be displayed when such a modification is made that the set number m decreases using the set number m in said selected measuring mode as a reference.

4. The electronic balance according to claim 1, characterized in that

the electronic balance further comprises a calculation portion for calculating the width of fluctuation which indicates chronographic change in the measured weight stored in said measured weight storing portion in sequence,

said averaging parameter is a first threshold value of the width of fluctuation of the measured weight for determining whether or not a stable state has been gained,

said average weight display controlling portion determines that a stable state has been gained when said width of fluctuation falls within the first threshold value and displays the average weight, which is the average measured weight of the number of samples, in the display portion and determines that a stable state has not been gained when said width of fluctuation is outside the first threshold value, and displays the average weight or the measured weight, which is the average measured weight of the number of samples that is smaller than the number of samples in said stable state, in the display portion, and

when such a modification is made that the first threshold value increases using the first threshold value in said selected measured mode as a reference, it becomes easy to determine whether the state is stable, while when such a modification is made that the first threshold value decreases using the first threshold value of said selected measuring mode as a reference, it becomes difficult to determine whether the state is stable.

5. The electronic balance according to claim 1, characterized in that

the electronic balance further comprises a calculation portion for calculating the width of fluctuation which indicates chronographic change in the measured weight stored in said measured weight storing portion in sequence,

said averaging parameters are the first threshold value of the width of fluctuation in said measured weight for determining whether the state is stable and a second threshold value for the continuing time of the state where the width of fluctuation in said measured weight is the first threshold value or less,

said average weight display controlling portion determines that the state is stable when the continuing time after said width of fluctuation becomes the first threshold value or less is longer than the second threshold value and displays the average weight, which is the average measured weight of the number of samples, in a display portion and determines that the state is not stable when the continuing time after said width of fluctuation becomes the first threshold value or less is not longer than the second threshold value, and displays the average weight or the measured weight, which is the average measured weight of the number of samples that is smaller than the number of samples in said stable state, and

when such a modification is made that the second threshold value becomes shorter using the second threshold value in said selected measured mode as a reference, it becomes easy to determine whether the state is stable, while when such a modification is made that the second threshold value becomes longer using the second threshold value of said selected measuring mode as a reference, it becomes difficult to determine whether the state is stable.

6. The electronic balance according to claim 1, characterized by further comprising an averaging parameter display controlling portion for displaying an image indicating the averaging parameter where a modification has been made in the display portion.

7. The electronic balance according to claim 2, characterized by further comprising an averaging parameter display controlling portion for displaying an image indicating the averaging parameter where a modification has been made in the display portion.

8. The electronic balance according to claim 3, characterized by further comprising an averaging parameter display controlling portion for displaying an image indicating the averaging parameter where a modification has been made in the display portion.

9. The electronic balance according to claim 4, characterized by further comprising an averaging parameter display controlling portion for displaying an image indicating the averaging parameter where a modification has been made in the display portion.

10. The electronic balance according to claim 5, characterized by further comprising an averaging parameter display controlling portion for displaying an image indicating the averaging parameter where a modification has been made in the display portion.