JPS59137828A - Display device of electronic balance - Google Patents

Abstract

PURPOSE:To simplify the measuring work, by computing the average weight of a sample group on a receiving pan, thereafter computing the deviation ratio of the samples together with the removed weight every time the samples are removed one by one, and synchronously displaying the result. CONSTITUTION:A load detecting part 1 detects a load on a receiving pan 1a. The detecting part 1 converts the detected value into a digital value at every minute time interval and outputs the result. The resut is sampled in a control part 2. The data is averaged based on the (i) items of the newest data among the load data stored in a random access memory 23 in the control part 2. Then, whether one sample is taken out of the receiving pan 1a or not is judged, and the deviation ratio of the removed weight with respect to the average weight is computed.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a display device for an electronic balance, and is particularly 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. The present invention relates to a display device for an electronic balance.

(B) Conventional technology For example, since tablet weight has a direct effect on the human body, the Japanese Pharmacopoeia's "weight deviation test" specified by the Pharmaceutical Affairs Law is used.
In this section, there are strict regulations regarding the permissible range of deviation of individual product weights from the average product weight. The content is to take 20 samples from the production loft, 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 an electronic balance, an interface, and a computer, as well as automated devices that are further equipped with a sample loading/unloading device, have already been put into practical use. but,
These conventional bags.

The drawbacks of this device are that it occupies a large area, is expensive, and lacks versatility.

(C) Purpose The present invention has been 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 section that detects the load on the pan at predetermined time intervals, and a means for sampling and storing the digitally converted data from the load detection section that detects the load on the pan, and for changing the sampling data. means for determining whether the sample group is in a stable state; The receiver is equipped with means for calculating the deviation rate of the removed weight from the average weight when one sample is removed from the plate and the sampling data becomes stable, and the receiver is placed on the plate. The present invention is characterized in that each time a sample is unloaded from a sample group, 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 Embodiments 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.

A load detection unit 1 that detects the load on the tray 1a converts the detected value into digital data at predetermined minute intervals, for example, every 0.2 seconds, and outputs the detected value, and the digital conversion data is sent to the control unit 2.
will be sampled and linked. 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 2 in which programs are written, and a random access memory that stores the above-mentioned sampling data, various calculation results, etc. It is composed of a memory 23, an average value register 24, a zero register 25, etc., which will be described later, and these are connected to each other by a pass line.

The control unit 2 includes a keyboard 3 equipped with a numeric keypad and operation keys for setting various initial values and provisional average value settings to be described later, and a display 4 that digitally displays numerical values based on command signals from the control unit 2. It is connected.

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

FIG. 2 is a flowchart showing a data processing program written in the read-only memory 22 according to the embodiment of the present invention.

The digitally converted data from the load detection section 1 is taken into the control section 20 and the random access memory 23, but the random access memory 23 has an area for storing up to 1,000 pieces of data, and every time the latest data dO arrives. The oldest data d is discarded in the output (STI, 5T2)
. First, when a group of tablet samples, which are objects to be measured, are placed on the tray la, the latest i (for example, 6) data G of the load data stored in the random access memory 23 are averaged. carried out (Sr1), its value W
From the deviation (do-WO) of the newly sampled data dO with respect to O, it is determined whether the sampling data is changing or transitioning to a stable state. That is, the deviation (do-Wo
) does not satisfy the following formula (1), the data is changing,
(If Equation 11 is satisfied, it is determined that the state is transitioning to a stable state (ST4).

ldo-w01≦R5・----(11 (In formula 11, R is the precision specific to this data and is a value input in advance. For example, if m is 30 on an electronic balance with R7!l<0.1 mg, In some cases, the deviation (do-Wo) is 0.
If it is 55 mg or more, it is judged that it is changing, and the data average value WO
The content t of the zero register 25 is subtracted from (1=0 at one point at this time), and the value is displayed momentarily on the display 4 (
ST5, 5T13°5T7). If the step response of the load detection unit 1 eventually attenuates and the deviation (do-Wo) satisfies (11), 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 number sampling. Data averaging is performed (ST, 9, 5T10).

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, the deviation (do=Wo
If ') does not satisfy equation (2) below, it is determined that the data is not completely stable, and if it satisfies equation (2), it is determined that data ' is in a completely stable state (STII) .

1do-Wo'l≦R1"■ -・-・ (2) As mentioned above, R is the precision inherent to this electronic balance, and its value is 0.1 mg. If (i+q> is 14, then The right side of the equation is 0.37 mg.If it is determined that the data is not completely stable, the content t (at this point, t-〇) of the zero register 25 is subtracted from the averaged value Wo', and the value is displayed moment by moment on the display 4 (, 5T1
2,5T13,5T7). When the data is determined to be completely stable, the value of WO' is not near zero and is 2'
Only when OR or higher, the receiver determines that a sample group whose average weight can be calculated is placed on the plate la, and proceeds to the average weight calculation mode for 5T17 or lower (ST 1.5. ST 16
). In other words, even if the data is completely stable, the receiver will switch to average weight calculation mode if no sample is placed on the pan Ia or if the sample group weight is not 20 times or more the precision R of the electronic balance. If it does not enter, and the value is 5T12 or less, the value of WO' is displayed every moment. In the average weight calculation mode, the receiver can select the following two methods for setting the number N of sample groups on the pan 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 la, and the second method is when the approximate average weight of the samples is known. In this method, an appropriate number of tablets are placed on the tray la, and the temporary average amount Y of the tablets is inputted from the keyboard 3. In the case of the first method, divide the value of W8' by the pre-input number N, for example 20, calculate the average weight X of the sample group. The weight is stored in the average value register X, the average value calculation flag is set, the value of Wo' is stored in the zero register t, and the average weight is displayed on the display 4 (ST21.5T27).

In the case of the second method, the input value V of the average weight is collected and stored in the average value register X, and the key flag is set as the centimeter STI. STI 9), round off the fraction of the value obtained by dividing Wo' by the average weight Y to find the number N (ST23), use the calculated number N to calculate the true average weight, and store the number N in the register. Similarly, X is rounded and stored in the average value register X instead of Y, the average value calculation flag is set, the value of Wo' is stored in the zero register t, and Display the average weight and number N on the display 4 (ST23.5T25°5T).
26.5T27). Note that the obtained number N is 2 as specified.
If the number is less than 0, the corresponding lamp from the notification lamp group 41 shown in FIG. 3(a) is blinked to notify that fact (ST24, 5T28).

Further, whether one of the first and second methods described above is selected is determined based on the blind spot of the key human power of the temporary average value (ST17, 5T20).

After the above average weight calculation mode is performed, 5T14
Then, the process advances to the deviation rate measurement mode of 5T29 or less. In the deviation rate measurement mode, using the standard deviation rate ko (for example, 7.5%) determined in the deviation test, K and ′ shown in the following equation (3) are calculated (ST31), and the receiver is plated. 1a
From this point, one sample is used to determine whether or not it has been raised.

K=1-3ko/100'=1+3'o/100 In other words, the weight of the tray removed from the tray 1a is the average weight
If it is within the range of ±3 times the standard deviation rate ko, it is determined that one sample has been unloaded, and if it is outside that range, it is determined that the sample has not been unloaded or that an abnormal product has been unloaded, or It is determined that two or more samples have been removed at once, and the indicator 4
The corresponding notification lamp 41 is blinked to display the removed weight (Sr32.5T33.5T34.5T36). In addition, the removed weight is determined by zero register t from the weight on pan la.
It is obtained by subtracting the value of (Sr29).

For example, if the number of samples N is 20, the weight is 4462.0 m.
g, 223.1 mg is stored in the average value register X in the average weight calculation mode, and the zero register t
4462.0mg is stored in . If left in this state, Wo'=0 at 5T29, the process progresses from Sr12 to 5T34, and Omg is displayed. And sample 1
If the average weight is 223.1 mg, the weight is within the range of 2' (with ko = 7.5%, within the range of 172.9 to 273.4111 g). For example, if it is 218.3 mg, 5T29
The value of Wo' is -218.3 mg, and -3T32
．． Proceeding from 5T33 to 5T35, the deviation rate k is as follows (4
) is calculated by the formula, rounding the value to I
It is transferred to the display register together with Wo'1, that is, 218.3 mg, and the display area of the display 4 is divided and displayed simultaneously as shown in FIG. 3 (bl).

lWo'l-Also=x 100-T41 At this time, the value of the number N is counted down by one.

Furthermore, the value of Wo' -218.3mg is added to and stored in the value of zero register t, 446.0mg, and t = 4243.
7 mg, which will be used for the next removal weight calculation (Sr3
6).

When the receiver finishes taking all 20 samples on the plate la one by one, N=0, from 5T30 to 5T37 or less, resets the average value calculation flag, clears the zero register t, and returns Wo'
The value O is displayed on the display 4, and the measurement of the next sample group is awaited. Note that only when the second method described above is adopted for setting the number of samples, the contents of the average value register
40).

In addition, if the value of Wo' is not near 0 even though the number N is 0, that value is displayed and the error notification lamp in the notification lamp group 41 of the display 4 is blinked. and notify that fact (Sr37.5T41).

As described above, the receiver places the sample group on the plate la, and once the data is stable, the average weight is calculated by dividing the weight by the number of sample groups, and then the receiver removes the samples one by one from the plate la. Each time, after the data has stabilized, 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 tray and the average weight is calculated, there is no need to memorize the weight of each sample value, and The storage capacity of the random access memory can be reduced compared to the above device, making it economical.

In addition, the sample weight and its deviation rate can be read at the same time, and
During removal, it is also possible to check the quality of the product for cracks, chips, etc. 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 and improving economic efficiency and versatility. The contribution is huge. Note that if a low average weight is input in advance, there is no need to count the number of sample groups and place the receiver on the pan, and errors in counting cannot occur.

[Brief explanation of the drawing]

Fig. 1 is a program diagram showing the configuration of an embodiment of the present invention;
The figure is a flowchart showing the data processing program, and FIG. 3 is a front view of the display showing an example of the display mode. 1--Load detection section 1a--Socket plate 2--Control section 3--Keyboard 4...Display unit 21-Central processing unit 22--Read only memory 23--Random access memory 24--Average value register 25-Zero Register Patent Applicant Shimadzu Corporation Patent Attorney Nishi 1
)new

Claims (3)

[Claims] (1) The receiver has means for sampling and storing digitally converted data from a load detection section that detects the load on the plate at predetermined time intervals, and means for determining whether the data is changing or in a stable state. The receiver has means for calculating and storing the average weight by dividing the weight of the sample group placed on the plate by the number of samples, and after calculating the average weight, the receiver removes one sample from the plate. , and when the above data becomes stable, the receiver is provided with means for calculating the deviation rate of the removed weight from the above average weight, and the receiver selects sample 1 from the sample group placed on the plate.
A display device of an electronic balance configured to simultaneously display the weight of the dropped sample and the sample deviation rate each time the sample is unloaded one by one, when the sample has been removed and the above data is in a stable state. . (2) The weight of the unloaded sample and its deviation rate are displayed simultaneously by dividing a multi-digit digital display into areas.
A display device for an electronic balance as described in Section 1. (3) The receiver is equipped with a means for calculating the number of samples by dividing the weight of the sample group on the plate by the provisional average weight entered in advance, and the receiver divides the weight of the sample group on the plate by the calculated number. 2. A display device for an electronic balance according to claim 1, wherein the display device for an electronic balance is configured to calculate and store the true average weight and simultaneously display the calculated number along with the true average weight.