JPS61270623A - Electronic balance - Google Patents

Abstract

PURPOSE:To determine the level of a disturbance while grasping it quantitatively without depending upon perception by calculating variation among a specific number of digital conversion data from a load detection part. CONSTITUTION:Up-to-date data as many as a number set with a key switch 3 among data in a RAM 23 from a load detection part 1 are averaged to determine and display the metered value of a load on a pan 1a on a display device 4. Then, it is decided whether data from the detection part 1 change or not during measurement in a disturbance state. While the data are stable, preset N data are fetched from the data group from the detection part 1 and the standard deviation of the N data is calculated and displayed 4. The standard deviation is used as an effective standard for comparing the level of a disturbance. For the purpose, electronic balances are provided at plural candidate places and standard deviation values at the respective places are compared to select a place where the deviation is smallest, thereby finding the most suitable installation place.

Description

[Detailed description of the invention] ? Industrial application field> The present invention relates to electronic balances.

<Conventional technology> Generally, in electronic balances, in order to stabilize the displayed weighing value against disturbances such as vibration, a large number of load data from the load detection section are averaged to obtain the weighing value. ing. The number of pieces to be averaged or the time for collecting data to be averaged (averaging time) is normally configured to be selectable depending on the magnitude of disturbance in the installation environment, required measurement accuracy, etc. It goes without saying that the installation environment should be in a place where there are as few disturbances as possible, such as vibrations. E; It is possible to obtain a measured value of h degrees.

<Problems to be Solved by the Invention> Based on the above, when installing an electronic balance, it is first necessary to determine which location is the most appropriate location with the least amount of disturbance such as vibration. , humans often make decisions based on intuition based on tactile sensations, etc.

However, there are some disturbances that are imperceptible to humans but do not affect high-precision electronic balances, and the conventional method of determining the installation location as described above has many problems.

In addition, once the installation location has been determined, the turbulence situation is not always the same.
The reality is that it is difficult to say that it is used based on the equalized number of iFs.

The present invention has been made in response to the above problems, and the electronic balance itself has a function to display and display the magnitude of disturbance at the installation location, thereby making it ideal for installation without relying on intuition. The purpose of the present invention is to provide an electronic balance that is capable of knowing from the electronic balance where it is located, or detecting changes in disturbance conditions after installation.

Means for Solving the Problems> The configuration of the present invention will be explained based on the functional block diagram shown in FIG.

The load detection part a generates an electric signal corresponding to the placed load,
The digitally converted data is supplied to the average value calculation means at predetermined time intervals. The average value calculation means determines a metric value each time data is averaged based on the selected number of averaged data. The measured value is displayed on the measured value display stage C. The digital conversion data from the load detecting section a is also used to calculate the magnitude of the dispersion in a preset number of data by the data dispersion calculating means d. The calculated magnitude of variation is configured to be displayed by variation display means e.

<Function> Load on the load detection part a; In a state where the load does not change, the value displayed by the dispersion display means (!) is correlated with the magnitude of disturbance at the location where the electronic balance is installed. Therefore, it is possible to know the degree of disturbance occurring at that location from the displayed value.

<Example> Embodiments of the present invention will be described below based on the drawings.

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

The load detection section 1 outputs an electric signal corresponding to the load placed on JI[l 1 a , . The control unit 2 is composed of a microcomputer, and includes a CPLJ 21 that executes various calculations and programs and controls each peripheral device, a ROM 22 in which measurement programs and disturbance situation measurement programs to be described later are written, and digital conversion from the load detection unit 1. It is provided with a RAM 23 having an area for storing data, an area for storing various calculation results, etc., and an input/output port 24 for connection with external equipment, which are connected to each other by a pass line.

In addition to the load detection section 1, the input/output boat 24 of the control section 2 includes a key switch 3 for giving commands to the control section 2, and a display for digitally displaying weighing values etc. according to commands from the control section 2. 4 is connected.

As shown in FIG. 3, the display device 4 includes a measured value display section 4a that displays measured values, and a disturbance situation display section 4b that displays a standard deviation σ calculated by a disturbance situation measurement program to be described later. It is equipped with

Next, we will discuss the effect. In the normal measurement mode, a measurement program is executed. In this measurement program, R
By averaging the latest data of the number selected with the key switch 3 among the data from the load detection unit 1 stored in the AM 23, the measured value of the load on the plate Ia is determined and displayed on the display. Display on 4.

Now, when the disturbance situation measurement mode is selected by the key switch 3, a disturbance situation measurement program as shown in FIG. 4 is executed.

In the disturbance situation measurement program, first, it is determined whether the data from the load detection section 1 is changing. In this case, the step response of the output of the load detection unit 1 due to loading and unloading of the load on the plate la has not settled down, and the disturbance situation cannot be measured while the data is changing, so the step response has not completely settled down. After the data reaches a stable state, proceed to the next step. This determination can be performed using a known stability determination method. For example, when the value of each individual data falls within a predetermined range with respect to the average value of data of a predetermined function, the data is stable. It can be determined that the condition exists.

In the data stable state, N pieces of data set in advance are taken in from the data group from the load detection unit 1 stored in the RAM 23, the standard deviation σ of these N pieces of data is calculated, and the value is displayed on the disturbance status display section 41) of the display 4. Variations in data in this data stable state are considered to be due to disturbances acting on the electron-large bottle, so its standard deviation σ is closely correlated with the magnitude of the disturbance at this installation location. This is an effective guideline for comparing the magnitude of disturbances.

Therefore, when deciding where to install an electronic balance, install the electronic balance at each of multiple candidate locations, compare the values of the standard deviation σ at each location, and find the location with the smallest value. By selecting, you can find the most suitable installation location. Furthermore, once the electronic balance is installed, changes in the surrounding disturbance status can also be known from the displayed value of the standard deviation σ.

In addition, in the above embodiment, the variation state of N pieces of data was represented by the standard deviation σ, but NIIXI
By determining and displaying the width of data dispersion, it is possible to use this as a guide for the disturbance situation.Furthermore, without directly displaying these, it is possible to determine the magnitude of the disturbance based on the data dispersion state. It can also be configured to calculate and display coefficients related to the degree of variation in the data.Furthermore, instead of displaying the coefficients numerically, the magnitude of the disturbance can be divided into multiple stages, and the magnitude of the data can be adjusted accordingly. It can also be configured to display the based stage.

Furthermore, in the series of embodiments, execution of the disturbance situation measurement program was instructed by mode selection using the key switch 3, but the program may be configured to be executed automatically upon power-on, for example.

Furthermore, in the disturbance situation measurement program, it is not necessarily necessary to determine the stability of the data;
The program may be configured to be executed after confirming the stability of the output.

<Effect> As explained above, according to the present invention, the load detection section]
Since the configuration is configured to calculate and display the magnitude of dispersion in a predetermined number of digitally converted data from the electronic balance, the magnitude of the displayed value in the stable state of the data can be used to determine whether there is any disturbance in the area where the electronic balance is installed. As a result, you can determine the best place to install your electronic balance without relying on intuition as you would with conventional methods.
It is possible to quantitatively understand and determine the magnitude of the disturbance.

Similarly, for electronic balances that have already been installed, it is possible to quantitatively understand changes in the disturbance situation at that location, and this can be used as a guide as to whether or not it is necessary to change the number of averaged balances.

[Brief explanation of drawings]

FIG. 1 is a functional block 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 front view of the display 4, and FIG. 4 is a functional block diagram of the embodiment of the present invention. This is a flowchart 1- showing a disturbance situation measurement block diagram written in the ROM 22. 1... Load detection section 2... Control section 3... Key switch 4... Display 4a... Measured value display section 4b... Disturbance status display section 21... CPU 22... ROM 23...RAM 24...I/O boat patent applicant Shimadzu Corporation Representative Patent attorney Nishi 1) New Japanese Patent Publication No. 6l-270623 (4) Figure 4

Claims (1)

[Claims] The balance determines and displays the weighing value by collecting digitally converted data from the load detection section at predetermined time intervals and calculating the average value of the above data based on the selected number of averaged pieces. comprising means for calculating the magnitude of variation in a predetermined number of the data, and means for displaying the magnitude of the calculated variation;
An electronic balance characterized in that it is configured so that the degree of disturbance at the location where the balance is installed can be reported by the displayed value of the magnitude of the dispersion when the load is stable.