JPH0719944A - Electronic balance - Google Patents

Abstract

PURPOSE:To provide an electronic balance, which can select a data processing method with a vibration-proof mode for measuring animal, besides an ordinary mode, and which can display the mass of a static load without generating an error at the time of loading the static load with a vibration-proof mode and which can cope with the operation flexibly at the time of maintenance and inspection. CONSTITUTION:A discriminating means (d) for discriminating that the fluctuation width of the data, which is sent from a load detecting unit (a), exceeds a preset value or not is provided. Under the condition that a vibration-proof mode is selected by a selecting means (c), a data processing method with a vibration- proof mode is carried out in the case where the fluctuation width of the data exceeds the preset value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic balance, more specifically, a so-called vibration resistance mode or animal measurement mode, which is used, for example, for measurement of experimental animals.
The present invention relates to an electronic balance capable of selecting a mode in which a relatively stable display value can be obtained even when the load to be measured vibrates.

[0002]

2. Description of the Related Art Generally, an electronic balance is configured to determine a weighing display value by averaging or filtering the momentary data from a load detecting portion engaged with a measuring pan. When measuring the weight of a moving animal, etc., the data from the load detector fluctuates greatly from moment to moment, so a stable display value can be obtained with a data processing method suitable for measuring normal static loads. I can't.

Therefore, conventionally, a mode in which a normal measurement mode and a mode called a vibration resistance mode or an animal measurement mode are set and which can be selected by a switch operation has been put into practical use.

In the vibration resistant mode or the animal measurement mode of this kind of electronic balance, a data processing method that is more resistant to vibration than the data processing method in the normal measurement mode, for example, when averaging load data to determine a measured value, Fluctuation of data /
Processing methods such as widening the stability range for prohibiting / permitting reading of the measured value to judge the stability and displaying the measured value as a stable state even when the load data are scattered are executed, and Even if the data fluctuates every moment, the measured data is used to obtain the measurement display value.

[0005]

By the way, in the electronic balance in which the vibration resistant mode or the animal measurement mode and the normal mode as described above can be selected, the balance is placed on the measuring pan before the measurement of the animal. There are cases where it is used to check the operation status of, but at this time,
If a weight is placed in the vibration-resistant mode or animal measurement mode, the weighing error will increase.For example, even if a weight with a known mass is loaded, a weighing value different from that mass is displayed. There is a chance that you will be mistaken for a malfunctioning balance.

An object of the present invention is that even if a static load such as a weight is weighed in a state where the vibration resistance mode or the animal measurement mode is selected, no error occurs in the weighing result, and this type of balance is particularly suitable. An object of the present invention is to provide an electronic balance capable of preventing misunderstandings and operation mistakes during maintenance and inspection of the.

[0007]

The structure for achieving the above object will be described with reference to the basic conceptual diagram shown in FIG. Is sampled by the weighing value determining means b, and the weighing value determining means b determines the weighing display value by any one of at least two kinds of data processing methods using the sampled data string, and the data used by the weighing value determining means b. The processing method is a balance configured so as to be determined according to the selection state by the selection means c for selecting either the normal mode or the vibration-proof mode. In the state where the discrimination means d for discriminating whether or not the value exceeds the value is provided, and the vibration-proof mode is selected by the selection means c, based on the discrimination result by the discrimination means d. There, the data fluctuation range is characterized by being configured so that the data processing method of the vibration mode only if it exceeds the predetermined value is executed.

[0008]

When the vibration resistance mode (or animal measurement mode) is selected and a static load such as a weight is applied, the data processing method in the normal mode is automatically performed based on the discrimination result from the discriminating means d. Is adopted.

[0009] Therefore, the user of the balance can perform the check before the actual measurement without considering the selection status of the mode by the selection means c. In addition, when the vibration resistance mode is selected and the static load such as the weight is applied and the data processing in the normal mode is executed as described above, it is determined that the actual measurement of the animal is performed. Since the data processing is automatically switched to the vibration resistant mode based on the determination result from the means d, no particular problem occurs.

[0010]

FIG. 2 is a block diagram showing the structure of an embodiment of the present invention. The load detection unit 1 is, for example, an electromagnetic force balance type detection unit, and outputs an electric signal corresponding to the load acting on the measurement dish 1a. The output signal from the load detector 1 is digitized by the A / D converter 2 and then taken into the data processor 3.

The data processing section 3 includes a CPU 31 and a ROM 3
2, RAM 33, and an input / output port 3 for connecting to an external device 10 such as a printer or a personal computer
The data processing unit 3 includes the A / D converter 2 described above.
In addition to the above, there is a display 5 for displaying a weighing display value, and a keyboard 5 having various keys including a mode selection key 5a for selecting either a normal mode or a vibration resistant mode (animal measurement mode). It is connected.

FIG. 3 is a flow chart showing the contents of the program written in the ROM 32 of the data processing section 3. The operation of the embodiment of the present invention will be described below with reference to this figure.
The digital conversion data from the load detector 1 is sampled at every predetermined minute time and stored in the RAM 33 every moment (ST1). A predetermined number of data storage areas are set in the RAM 33, and each time new data is sampled, the oldest data is discarded and the latest predetermined number of data is always stored (S).
T2).

Now, in the data processing section 3, it is judged whether or not the vibration resistant mode (or animal measurement mode, hereinafter simply referred to as vibration resistant mode) is selected in ST3, and when the normal mode is selected, Goes to ST4 to determine the measured value by the usual data processing method and display it on the display 4 (ST5). If the anti-vibration mode is selected, check the load data fluctuation status by the following method.

That is, the data from the load detector 1 is
Let x ₀ be the latest one, and x i be the data before _i , X ₁ = x ₀ + x ₁ + x ₂ + x ₃ X ₂ = x ₄ + x ₅ + x ₆ + x ₇ X ₃ = x ₈ + x ₉ + x ₁₀ Request _{+ x 11 X 4 = x 12} + x 13 + x 14 + x 15. The X ₁ to X ₄ is updated every time the four sampled load data. That is, every time the latest load data is sampled four times, X ₁ → X ₂ , X ₂ →
X ₃ and X ₃ → X ₄ are shifted, and X ₁ is newly calculated (ST6 and ST7).

And

[0016]

[Equation 1]

It is determined whether or not the condition is satisfied (ST9).
When the condition of the expression (1) is satisfied, it means that the load data is stable to some extent or more, it is determined that no animal is placed on the measuring dish 1a, and the vibration resistant mode is selected. Despite this, the process proceeds to ST5 and thereafter to determine and display the measured value by the data processing method in the normal mode. As a result, when a static load such as a weight is applied in the vibration resistant mode, the data processing in the normal mode is automatically performed, and the measurement display value does not have an error.
When the condition of the expression (1) is not satisfied, the measured value is determined by the data processing method in the vibration resistant mode according to the mode selection (ST10) and displayed on the display.

If n does not reach 4 in ST6, that is, if it is not the fourth data sampling, the process proceeds to ST12, the measured value is determined by the same data processing method as the last time, and the value is displayed on the display. To do. In this case, the value of n is incremented by 1 in ST11, and if n is 4, the value is reset to 1 in ST9. As a result, by checking the value of n in ST6, it can be determined whether or not it is the fourth data sampling.

The determination as to whether or not the data is changing is not limited to the method according to the formula (1) as in the above embodiment, and the point is that it is comparable to the state in which the animal is placed on the measuring dish. It suffices to determine whether the load data is changing,
Any determination method can be adopted as long as it is a determination method according to this viewpoint.

[0020]

As described above, according to the present invention,
In the electronic balance that can select the vibration resistant mode (or animal measurement mode) and the normal mode, even when the vibration resistant mode is selected, the fluctuation range of the load data is within the predetermined range, Since the weighing display value is automatically determined by the data processing method in the normal mode, when a weight is loaded to check the electronic balance with the vibration resistant mode selected to measure the animal, the weight Since the weight is displayed accurately, it is possible to flexibly deal with the operation during maintenance and inspection of this kind of electronic balance, and at the same time, the balance user also changes the mode especially for maintenance and inspection. Eliminates the need and improves usability.

[Brief description of drawings]

FIG. 1 is a basic conceptual diagram showing the configuration of the present invention.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 3 is a flowchart showing the contents of a program written in a ROM 32 of the data processing unit 3.

[Explanation of symbols]

 1 load detection unit 1a measuring dish 2 A-D converter 3 data processing unit 31 CPU 32 ROM 33 RAM 4 display 5 keyboard 5a mode selection key 6 input / output port

Claims (1)

[Claims] 1. A measurement data is sampled by a data processing means from a load detecting section, and the data processing means determines a measurement display value by any one of at least two kinds of data processing methods using a sampled data string. In addition, the data processing method used by this data processing means is
In a balance configured to be determined according to the selection status by the mode selection means for selecting either the normal mode or the vibration-proof mode, the fluctuation range of the momentary data from the load detection unit exceeds a predetermined value set in advance. In the state in which the vibration selecting mode is selected by the mode selecting means, only when the data fluctuation width exceeds the predetermined value based on the result of the judgment by the judging means. An electronic balance characterized by being configured to execute a data processing method in a vibration resistant mode.