JPH0444683B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a display device for an electronic balance, and in particular,
The present invention relates to a display device for an electronic balance suitable for measuring the deviation rate of each sample weight with respect to the average weight of a sample group, such as in a weight deviation test.

(b) Prior Art For example, since tablet weight has a direct effect on the human body, the Japanese Pharmacopoeia's "Weight Deviation Test" section stipulated by the Pharmaceutical Affairs Law examines the deviation of individual product weights from the average weight of the product. There are strict regulations regarding the permissible range. The content is to take 20 samples from the production lot, measure their individual weights with a balance, calculate the average weight from the total weight of the 20 samples, calculate the deviation rate of each sample weight from the average weight, and calculate the deviation rate of each sample weight from the average weight. This is a test to see if the value is within the specified value. Conventionally, in order to save labor in this type of testing, devices that combine electronic balances, interfaces, and computers, as well as automated devices that add sample loading and unloading devices, have already been put into practical use. Conventional devices have the drawbacks of occupying a large area, being expensive, and lacking in versatility.

(c) Purpose The present invention was made in view of the above, and provides an economical and versatile display device for an electronic balance that can simplify the work of measuring the deviation rate as described above using only an electronic balance. For the purpose of providing.

(D) Structure The display device for an electronic balance of the present invention includes means for sampling and storing digitally converted data from a load detection unit that detects the load on a tray at predetermined time intervals, and a means for sampling and storing digitally converted data from a load detection unit that detects a load on a receiving tray, and a means for storing the digitally converted data from a load detection unit that detects a load on a receiving tray, and a means for storing the digitally converted data from a load detection unit that detects a load on a receiving tray. a means for determining whether the sample group is in a stable state; a means for calculating and storing the average weight by dividing the weight of the sample group placed on the receiving tray by the number of samples; and a receiving tray based on data from the load detection section. means for determining that one sample has been removed from the tray when the weight on the tray has decreased by an amount within a preset range from the calculated and stored average weight; After it is determined that the sampling data is in a stable state, the device is equipped with means for calculating the deviation rate of the removed weight from the average weight, and the sample is taken one by one from the sample group placed on the receiving tray. The system is characterized in that each time the sample is unloaded, the weight of the unloaded sample and the deviation rate of that sample can be displayed after waiting for the sampling data to stabilize.

(e) Examples Examples of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

Load detection unit 1 that detects the load on the tray top 1a
converts the detected value into digital data at predetermined minute intervals, for example every 0.2 seconds, and outputs the digitally converted data, and the digitally converted data is sampled by the control unit 2. The control unit 2 includes a central processing unit 21 that executes various calculations and programs and controls each peripheral device, a read-only memory 22 in which programs are written, and a random access memory 23 that stores the above-mentioned sampling data, various calculation results, etc. , an average value register 24 and a zero register 25, which will be described later, and the like, which are connected to each other by a bus line. The control unit 2 includes a keyboard 3 equipped with a numeric keypad and operation keys for setting various initial values and setting a temporary average value (described later), and a display 4 that digitally displays numerical values based on command signals from the control unit 2.
is connected.

Next, the operation of the embodiment of the present invention will be described.

FIG. 2 shows a read-only memory 2 according to an embodiment of the present invention.
2 is a flowchart showing a data processing program written in FIG.

The digital conversion data from the load detection section 1 is taken into the random access memory 23 of the control section 2, but the random access memory 23 has a maximum of m+
It has an area for storing one piece of data, and every time the latest data do arrives, the oldest data dm is discarded (ST1, ST2). First, when a group of tablet samples to be measured is placed on the receiving tray 1a, data averaging is performed using the latest i pieces (for example, 6 pieces) of the load data stored in the random access memory 23. (ST3) From the deviation (do−Wo) of the newly sampled data do with respect to the value Wo, it is determined whether the sampling data is changing or transitioning to a stable state. That is, while the deviation (do-Wo) does not satisfy the following formula (1), it is determined that the data is changing, and when it satisfies formula (1), it is determined that the data is transitioning to a stable state (ST4).

|do−Wo|≦R√ (1) In equation (1), R is a precision specific to this data and is a value input in advance. For example, R is 0.1mg
When m is 30 on an electronic balance, if the deviation (do-Wo) is 0.55 mg or more, it is judged that it is changing.
From the data average value Wo to the contents of zero register 25 t
is subtracted (t=0 at this point), and the value is displayed momentarily on the display 4 (ST5, ST6,
ST7). When the step response of the load detection unit 1 eventually attenuates and the deviation (do-Wo) satisfies (1), it is determined that the data is transitioning to a stable state, and the number of data is sequentially increased from i for each data sampling. Then, data averaging is performed (ST9, ST10). The number of data (i+q) for averaging is increased until it reaches the maximum data storage m of the random access memory 23 (ST8). Then, as long as the deviation (do - Wo') of the newly collected data do from the averaged value Wo' of (i + q) pieces of data does not satisfy the following equation (2), it is determined that the data is not completely stable. , it is determined that the data is in a completely stable state if equation (2) is satisfied (ST11).

｜do−Wo′｜≦R√+ ...(2) As mentioned above, R is the precision inherent to this electronic balance, and its value is 0.1 mg, and if (i + q) is 14,
The right side of equation (2) is 0.37 mg. When it is determined that the data is not completely stable, the content of the zero register 25 t (t=0 at this point) is calculated from the averaged value Wo'.
is subtracted, and the value is displayed every moment on the display 4 (ST12, ST13, ST7). When it is determined that the data are in a completely stable state, only when the value of Wo' is not near zero and is 20R or more, it is determined that a sample group whose average weight can be calculated is placed on the tray 1a, and ST17 Proceed to the average weight calculation mode below (ST15, ST16). In other words, even if the data is completely stable, there may be cases where no sample is placed on the tray 1a, or the weight of the sample group is not accurate to the accuracy R of the electronic balance.
If it is not 20 times or more, the average weight calculation mode is not entered, and the values of ST21 or less and Wo' are displayed momentarily.
In the average weight calculation mode, the following two methods can be selected for setting the number N of sample groups on the tray 1a. The first method is to count sample tablets by a preset and input number N (for example, 20) and place them on the tray 1a.
This is a method in which the approximate average weight of the sample is known, and an appropriate number of tablets are placed on the tray 1a, and the provisional average weight is input from the keyboard 3. In the case of the first method,
The value of Wo′ is set to the pre-input number N, e.g.
Divide by 20 to calculate the average weight of the sample group (ST21), round the value to less than the displayed digit, store it in the average value register X, set the average value calculation flag, and set the value of Wo'. zero register t
and displays the average weight on the display 4 (ST21, ST27). In the case of the second method, the input value of the average weight is collected and stored in the average value register X, and a key flag is set (ST18, ST19).
Dividing Wo' by the average weight and rounding off the fraction to find the number N (ST23), use the calculated number N to calculate the true average weight, store the number N in a register, and do the same in the same way. Round the number and store it in the average value register X, set the average value calculation flag, store the value of Wo' in the zero register t, and display the average weight and number N as shown in Figure 3a. Display on device 4 (ST23, ST25,
ST26, ST27). Incidentally, if the determined number N is less than the specified 20, the corresponding lamp from the notification lamp group 41 shown in FIG. 3a is blinked to notify that fact (ST24, ST28). Further, whether one of the above-mentioned first and second methods is selected is determined based on whether or not a temporary average value key is input (ST17, ST20).

After the above average weight calculation mode is performed,
Proceed from ST14 to the deviation rate measurement mode below ST29. In the deviation rate measurement mode, using the standard deviation rate ko (e.g. 7.5%) determined in the deviation test,
K and K′ shown in the following equation (3) are calculated (ST31),
This is used to determine whether one sample has been taken down from the tray 1a.

K = 1-3K ₀ /100 K' = 1 + 3K ₀ /100 ... (3) In other words, if the weight removed from the tray 1a is within ±3 times the specified deviation rate ko from the average weight, it is considered a sample. It is determined that one sample has been unloaded, and if it is outside the range, it is determined that the sample has not been unloaded, or that an abnormal item has been unloaded, or that two or more samples have been removed at once, and the corresponding display on indicator 4 is displayed. The notification lamp 41 is made to blink and the removed weight is displayed (ST32, ST33, ST34, ST36). The removed weight is obtained by subtracting the value of the zero register t from the weight on the tray 1a (ST29). For example, if the number of samples N is 20 and the weight is 4462.0 mg, 223.1 mg is stored in the average value register X in the average weight calculation mode and the zero register t is
4462.0mg is stored. If left in this state, Wo' = 0 in ST29, and 0mg is displayed as the process progresses from ST32 to ST34. Then, one sample was taken down, and its weight was within the range of K and K′ shown in equation (3) for the average weight of 223.1 mg (172.9 if ko = 7.5%).
~273.4mg), for example, if it is 218.3mg, the value of Wo' becomes -218.3mg at ST29, and the value of Wo' becomes -218.3mg from ST32, ST33 to ST35, and the deviation rate k
is calculated by the following formula (4), and the value is rounded and transferred to the display register along with |Wo'|, that is, 218.3mg, and is displayed on the display 4 as shown in Figure 3(b). Divide the area and display them at the same time.

k=|Wo′|−/×100 (4) At this time, the value of the number N is counted down by one. Furthermore, the value of Wo' -218.3 mg is the zero register t
is added to the value of 446.0 mg and stored, resulting in t = 4243.7 mg, which is used for the next removal weight calculation (ST36).

When all 20 samples on the tray 1a are taken one by one, N=0, from ST30 to ST37, the average value calculation flag is reset, the zero register t is cleared, and the value 0 of Wo' is displayed on the display 4. and waits for measurement of the next sample group. Note that only when the second method described above is adopted for setting the number of samples, the contents of the average value register X are not cleared and the provisional average weight of the next sample group is supplied (ST39, ST40). Also,
If the value of Wo' is not in the vicinity of 0 even though the number N has become 0, that value is displayed and the error notification lamp in the notification lamp group 41 of the display 4 is blinked. (ST37,
ST41).

As described above, once a sample group is placed on the tray 1a and the data is stable, the average weight is calculated by dividing the weight by the number of samples, and then each time one sample is removed from the tray 1a, After waiting for the data to stabilize, the removed weight and the deviation rate of the sample from the average weight are calculated and displayed at the same time.

(f) Effects As explained above, according to the present invention, since the sample group is initially placed on the receiving tray and its average weight is calculated, there is no need to memorize the individual weight of each sample, and it is not necessary to memorize the weight of each sample individually. Compared to this, the storage capacity of the random access memory can be reduced, which is economical. In addition, the sample weight and its deviation rate can be read at the same time, and it is also possible to check the quality of the product for cracks, chips, etc. when removing it, and at the same time, it is possible to check the quality of the product for cracks, chips, etc. when the samples are attached to each other. Even if the above sample is lowered from the receiving tray,
The deviation rate is not calculated, and incorrect data due to work errors is automatically eliminated. Furthermore, it eliminates the need for peripheral devices such as computers and interfaces as in the past, and allows testing to be carried out using only an electronic balance without reducing work efficiency, reducing the area occupied by the device, making it more economical, and more versatile. It is a great contribution to the Note that if the temporary average weight is input in advance, there is no need to count the number of samples in the sample group and place them on the tray, and errors in counting cannot occur.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a flowchart showing a data processing program, and FIG. 3 is a front view of a display showing an example of its display mode. DESCRIPTION OF SYMBOLS 1... Load detection part, 1a... Receiver, 2... Control part, 3... Keyboard, 4... Display device, 21...
... central treatment unit, 22 ... read-only memory,
23... Random access memory, 24... Average value register, 25... Zero register.

Claims (1)

[Scope of Claims] 1. Means for sampling and storing digitally converted data from a load detection unit that detects the load on the tray at predetermined time intervals, and determining whether the data is changing or in a stable state. means for calculating and storing the average weight by dividing the weight of the sample group placed on the tray by the number of samples; means for determining that one sample has been removed from the tray when the weight of the sample has decreased by an amount within a preset range with respect to the average weight; and after determining that one sample has been removed. ,
When the above data is determined to be in a stable state,
A display device for an electronic balance, comprising means for calculating a deviation rate of the removed weight with respect to the average weight, and configured to simultaneously display the calculated deviation rate and the removed weight. 2. The electronic balance according to claim 1, wherein the removed weight and its deviation rate are displayed simultaneously by dividing a multi-digit digital display into areas. 3 Equipped with a means to calculate the number of specimens on the tray by dividing the weight of the sample group on the tray by the provisional average weight entered in advance, and calculate the true average weight by dividing the weight of the specimen group on the tray by the calculated number. 2. A display device for an electronic balance according to claim 1, wherein the display device is configured to be able to store the calculated weight and display the calculated number at the same time as the true average weight.