JPH0544965B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a display device for an electronic balance, and in particular,
This invention relates to a display device that is effective when weighing a fixed amount of a powder or liquid sample.

<Prior Art> The work of accurately weighing a fixed amount, for example 5 g, of a powder or liquid sample occupies a large portion of weighing work. This kind of work is
Generally, this is done by dropping the sample onto a plate using a spoon or the like while watching the display.

<Problems to be solved by the invention> Injecting a sample as described above is traditionally called "spooning" and is usually done by holding a spoon in one hand and applying vibrations to the spoon with the other hand. Then, the input amount is adjusted, and the input amount is adjusted according to the difference between the weighed target value and the current displayed value. Therefore, this work requires skill and poses a serious problem in terms of work efficiency for beginners.

The present invention was made to solve this problem, and it is possible to grasp at a glance the excess/deficiency of the weighed value relative to the target value, and the degree thereof, just by looking at the display, and requires no skill. The purpose of the present invention is to provide a display device for an electronic balance that allows efficient weighing work without any hassle.

<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 section detects the load on the plate and supplies the detected data to the calculation section. The arithmetic unit determines a measured value by averaging the detected data, and displays the measured value on a digital display including a plurality of date-shaped display bodies.

The weighing target value inputted from the input means is stored in the memory.

The means of comparison is the current weighing value, the contents of the memory,
That is, the weighed target values are compared. Based on the comparison result, the display changing means changes the display mode of the Japanese character display corresponding to the lower first and second digits of the digital display as follows.

(1) When the weighing value is outside the preset first range with respect to the weighing target value stored in the memory, and the weighing value is smaller than the target value, the lower first digit and The second digit is displayed as a lower bar.

(2) When the measured value is outside the first range with respect to the target value and the measured value is larger than the target value,
The lower first and second digits are displayed as an upper bar.

(3) When the measured value is within the first range with respect to the target value and outside the preset second range, and the measured value is smaller than the target value,
The lower first digit is displayed as a lower bar.

(4) When the measured value is within the first range relative to the target value and outside the second range, and the measured value is greater than the target value, the lower first digit is displayed as an upper bar. .

<Function> By inputting the weighing target value, the digital display will display the lower first digit and second digit according to the difference until the weighing value reaches the target value.
The lower bar of the digit or the lower first digit is displayed, and the operator is given a sign that there is a shortage or a slight shortage.
If the measured value exceeds the target value, the same digit is displayed as an upper bar to send a sign to the operator that the value has exceeded or slightly exceeded. Therefore, the operator can grasp the current status of the load on the pan relative to the target weighing value by simply looking at the bottom first and second digits of the digital display. By adjusting the input amount thereafter, even inexperienced workers can work efficiently.

<Example> An example 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 unit 1 detects the load on the plate 1a, and the digital conversion data is stored for a predetermined minute period, e.g.
Data is collected by the control unit 2 every 0.1 seconds.

The control unit 2 is composed of a microcomputer, and executes programs and controls each peripheral device.
A CPU 21, a ROM 22 in which a data processing program (to be described later) is written, digital conversion data from the load detection section 1 and calculation results by the CPU 21,
RAM 23, input/output port 2, which has an area for storing input values of weighing target values, etc., which will be described later.
4, etc., and these are connected to each other by bus lines.

In addition to the load detection section 1, the control section 2 includes a digital display 3, which is made up of a plurality of date-shaped display bodies and is capable of digitally displaying weight values down to the smallest digit of 0.1 mg based on commands from the CPU 21; Also connected are operation keys 4 for inputting weighing target values and the like.

Next, list the effects. FIG. 3 is a flowchart showing a data processing program written in the ROM 22.

Before starting the weighing operation, a target weighing value W is input by operating the operation key 4. This causes the value to be stored in the RAM 23.

Now, the digital conversion data from the load detection section 1 is stored in the RAM 22 moment by moment at the minute intervals mentioned above, but the RAM 22 has an area for storing up to n+1 pieces of data, and the latest data d ₀
The oldest data is discarded each time it is collected (ST1, ST2). Every time data d ₀ is collected, d ₀ ...
... The average value W ₀ of the latest i pieces of data, for example, 5 pieces of data of d _i-1 is calculated, and the value is rounded to the smallest display digit, 0.1 mg (ST3). W ₀ after this rounding becomes the calculated value.

The calculated value W ₀ is compared with the weighed target value stored in the RAM 23, and it is determined whether it is within a first range preset for W, for example, ±1% ( ST4). If it is outside the range, when W ₀ < W, the lower first and second digits of W ₀ are transferred to the display register set in the RAM 23 as a lower bar display as described later, and are displayed digitally. Display on container 3. (ST5, ST6, ST8). Also, W ₀
>W, similarly, the lower first and second digits of W ₀ are transferred to the display register in the upper bar display state as described later, and displayed on the digital display 3 (ST5, ST7, ST8) .

If the measured value W ₀ is within ±1% of the target value W, then check whether W ₀ is within a second range preset for W, for example ±0.1%. is determined (ST9). If out of range, W ₀
When <W, the lower first digit of W ₀ is displayed as a lower bar and transferred to the display register, and W ₀ >
When it is W, the lower first digit of W ₀ is displayed as an upper bar and transferred to the display register and displayed on the digital display 3 (ST10, ST11, ST8;
ST10, ST12, ST8).

When the weighing value W ₀ is within ±0.1% of the target value W, W ₀ is transferred to the display register with all digits intact and displayed on the digital display 3 (ST9, ST13, ST8).

The above operation can be explained using the digital display 3 shown in Fig. 4.
This will be explained in detail with reference to the display state of . Assume that the weighing target value W is set to 50,000 g, for example. As the sample is introduced, as long as the measured value W ₀ is less than the target value by 1%, that is, 50 mg or more, the 1 mg and 0.1 mg digit indicators will change to the lower bar as shown in Figure 4a. Is displayed. This shows that it is still okay to continue making rough inputs.

As a result of continued injection, if there is a shortage of less than 1% or 0.1% or more with respect to the target value w, the display with only the 0.1 mg digit becomes a lower bar display, as shown in Figure b. This allows the operator to check the current weighing value.
It turns out that W ₀ is slightly short of the target value W, and it is learned that it is best to gradually increase the input.

Eventually, when the measured value W ₀ falls short by 0.1%, or less than 5 mg, from the target value, all digits are displayed as shown in c in the same figure, indicating that the input amount is extremely close to the target value. I know what happened.

If the target value W is exceeded, if the excess amount is 5 mg or more and less than 50 mg, only the 0.1 mg digit will be displayed as an upper bar, as shown in Figure d; , as shown in Figure e, the 1 mg and 0.1 mg digits are displayed as bars on the upper side, allowing the user to know the amount of sample to be removed.

In addition, if the first and second ranges (±1%, ±0.1%) in the above embodiments are made freely selectable, the range can be selected as appropriate according to the allowable error for the weighed target value. For example, if the second range matches the allowable error range, it is possible to know that the weighing operation is complete when all digits are displayed.

<Results> As explained above, according to the present invention, the measured value is weighed and compared with the target, and the excess/deficiency status and degree are indicated by the display mode of the lower first and second digits of the digital display. The operator is notified by displaying the upper bar or the lower bar, so it is not necessary to memorize the target weighing value during weighing work and to constantly check all digits on the display. There is no need to worry about overdoing and adjust the amount of input while comparing it with the value, and efficient weighing work can be performed without requiring skill.

[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 flowchart showing the data processing program written in the ROM 23, and FIG. 4 is a diagram showing the display state of the digital display 3 depending on the magnitude of the measured value. 1... Load detection section, 2... Control section, 21...
CPU, 22...ROM, 23...RAM, 3...
Digital display, 4...operation keys.

Claims (1)

[Scope of Claims] 1. A display device in a balance that calculates and displays a weighing value based on output data of a load detection unit that detects a load on a pan, which comprises a plurality of date-shaped display bodies, A digital display for displaying the weighing value, an input means for inputting the weighing target value,
A memory for storing the input value, a comparison means for comparing the current weighing value and the contents of the memory, and a display mode of the lower first and second digits of the digital display based on the comparison results as follows. 1. A display device for an electronic balance, comprising: a display changing means for changing the display. (1) When the measured value is outside the first range set in advance for the contents of the above memory, and the measured value is smaller than the contents of the above memory,
The lower first and second digits are displayed as a lower bar. (2) The weighing value is the same as the first one above with respect to the contents of the above memory.
If it is outside the range and the measured value is larger than the content of the memory, the lower first and second digits are displayed as upper bars. (3) The weighing value is the same as the first one above with respect to the contents of the above memory.
When the measured value is smaller than the content of the memory and is within the range set in advance and outside the preset second range, the lower first digit is displayed as a lower bar. (4) The weighing value is the same as the first one above with respect to the contents of the above memory.
and outside the second range, and the measured value is larger than the content of the memory, the lower first digit is displayed as an upper bar.