JP2977011B2 - Load cell scale and its load adjustment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load cell type scale for measuring a load with a plurality of load cell units and a method for adjusting the load.

[0002]

2. Description of the Related Art In a load cell type balance in which a single mounting table is supported by a plurality of load cell units and the output of each load cell unit is summed to obtain a weighed value, there is a variation in sensitivity among the load cell units. A load cell unit that has been subjected to high-precision sensitivity adjustment is used so that there is no load cell unit.

Alternatively, as disclosed in JP-A-2-238327, when the outputs of the load cell units are summed, the outputs of the load cell units are respectively corrected by sensitivity correction means, and then the output of each load cell unit is calculated by the calculation means. Addition. To carry out the writing of the output correction coefficient to each sensitivity correction means, the mounting table was removed, the load correction coefficient was calculated by loading a known weight individually with a weight for each load cell unit, and calculated. The output correction coefficient is set in the sensitivity correction means for its own load cell unit.

[0004]

However, none of the above methods can cope with a geometrical disorder of the load transmitting mechanism such as the level of the base surface when the scale is installed at the place of use. At present, it is a factor of the measurement error.

It is conceivable to measure and write the output correction coefficient as described in JP-A-2-238327 after the scale is installed at the place of use, but it is troublesome at present.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a load cell type balance capable of realizing sensitivity adjustment of each load cell unit by a simple operation after installation of the balance and a method of adjusting the load thereof.

[0007]

According to a first aspect of the present invention, there is provided a load cell type balance which supports a platform with a plurality of load cell units, calculates a measured load of each load cell unit, and mounts the load on the platform. A load cell type scale for measuring a measurement load, wherein the weight is not placed on the output table and the output of each load cell unit for each mounting location obtained by replacing weights a plurality of times at a plurality of positions on the table. Storage means for storing the output of each load cell unit at the time of no load, and the output of each load cell unit at the time of no load and the load and weight for each mounting location obtained by reloading a plurality of times a calculating means for calculating an output correction factor for each load cell unit for aligning the sensitivity of each load cell unit from the output of each load cell unit, the output complement of the load cell unit Calculated a weight of correcting the amount of copper the output of each load cell in a state in which the center bearing the weight on the weighing platform using the coefficient, the calculation weight of the weight, wherein prefixed obtained instead put several times the weight The output of each load cell unit for each location is corrected with the output correction coefficient and compared with each calculated weight, and when the difference between the calculated weights exceeds a certain reference value, the calculated output correction coefficient is Checking means for instructing re-execution of adjustment work as inappropriate, output correction coefficient storage means for storing the output correction coefficient of each load cell unit when the obtained output correction coefficient is appropriate, and output correction coefficient Processing means for correcting the output of each load cell unit at the time of weight measurement using the output correction coefficient written in the storage means and then summing the outputs.

[0008] The load cell type balance according to claim 2 is
The load cell type balance according to claim 1, further comprising mode switching means for switching between an output value correction mode for displaying the measured load and an offset load adjustment value calculation mode for adjusting the offset load.

According to a third aspect of the present invention, there is provided a method for adjusting a load of a load cell type balance, wherein a plurality of load cell units support a mounting table, a measured load of each load cell unit is calculated, and a measured load of the load cell unit mounted on the above-mentioned table. A method for adjusting the load of a load cell type scale that measures the output of each load cell unit for each mounting location obtained by reloading a plurality of weights at a plurality of positions on the table and a weight on the table. The output of each load cell unit in the no-load state where no load is placed is stored, and the output and weight of each load cell unit in the no-load state and the weight for each mounting location obtained by replacing the weight a plurality of times are stored. and computing an output correction factor for each load cell unit for aligning the sensitivity of each load cell unit from the output of each load cell unit, the output correction of each load cell unit Calculated a weight of correcting the amount of copper the output of each load cell in a state of placing the weight in the center of the platform using a number, and calculating the weight of the weight, wherein prefixed obtained instead put several times the weight The output of each load cell unit for each location is corrected with the output correction coefficient and compared with each calculated weight, and when the difference between the calculated weights exceeds a certain reference value, the calculated output correction coefficient is Instruct the re-execution of the adjustment work as inappropriate, store the output correction coefficient of each load cell unit when the obtained output correction coefficient is appropriate, and write it to the output correction coefficient storage means at the time of load measurement. The output of each load cell unit is corrected at the time of weight measurement using the output correction coefficient, and then the sum is output, and the total value is output.

[0010]

According to the structure of the first aspect and the method of the third aspect, when the outputs of the plurality of load cell units supporting the mounting table are totaled, the output and the weight of each load cell unit in the no-load state are calculated. The output correction coefficient of each load cell unit for equalizing the sensitivity of each load cell unit is obtained from the output of each load cell unit for each mounting location obtained by reloading a plurality of times, and the processing means weighs using the output correction coefficient. Sometimes the output of each load cell unit is corrected and then summed up to obtain the weighed output, so the output correction coefficient is automatically calculated by replacing the weight, and the output is corrected by the output correction coefficient at the time of weight measurement and the weighed value is calculated. the output child and <br/> a. Then, a calculation by weight of correcting the amount of copper the output of each load cell unit when the output using a correction coefficient place the weight in the center of the platform for each load cell unit, and calculating the weight of the weight, a plurality of weights The output of each load cell unit for each of the placement locations obtained by reloading is compared with each calculated weight obtained by correcting the output correction coefficient with the output correction coefficient and calculating the sum.
When the difference in the calculated weight exceeds a certain reference value, it is determined that the output correction coefficient obtained is inappropriate and the re-execution of the adjustment operation is instructed. The performance is improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

The load cell scale according to the present invention is shown in FIGS.
It is configured as shown in FIG.

In this embodiment, the mounting table 2 is supported by four load cell units 1a, 1b, 1c, 1d. The load cell units 1a to 1d are connected to an indicator 4 via a communication line 3. Each load cell unit 1a-1d
And the indicator 4 are configured as follows.

Since the load cell units 1a to 1d are all the same, a description will be given here by taking the load cell unit 1a as an example.

As shown in FIG. 1, the load cell unit 1
In the casing 5, a bridge circuit 6, an A / D converter 7, a temperature sensor 8, a central processing unit 9a, in addition to the strain body, a bridge connected to a strain gauge attached to the strain body. , A communication control 10a, a communication driver receiver 11a, and the like. The power supply voltage of ± 15 VDC supplied from the outside to the casing 5
At a, the voltage is converted into various necessary voltages inside the load cell unit 1a and is supplied to each unit. An excitation voltage is applied to the strain gauge bridge circuit 6 via a reference power supply 12b. The output voltage of the bridge circuit 6 is the amplifier 1
3 and a low-pass filter 14 are applied to the input of the A / D converter 7.

The conversion timing of the A / D converter 7 is managed by the central processing unit 9a.
The digitally converted weighed data is taken into the central processing unit 9a. The temperature sensor 8 detects the internal temperature of the casing 5, and here, measures the temperature of the flexure element to which the bridge circuit 6 is bonded, and the temperature data is taken into the central processing unit 9a. The temperature data taken into the central processing unit 9a is used for temperature correction of the weighed data taken from the A / D converter 7. The central processing unit 9a includes a communication control 10a and a communication driver receiver 11a.
Is connected to the communication line 3 via the. The load cell units 1b to 1d are similarly connected to the communication line 3.
Note that different individual numbers are assigned to the load cell units 1a to 1d in advance.

The load cell unit 1 via the communication line 3
The indicator 4 connected to a to 1d has a built-in system controller 15 as follows.

The system controller 15 comprises a communication driver receiver 11b, a communication controller 10b, a central processing unit 9b, a weighing calculation data processing section 16, and an indicator interface 17. The central processing unit 9b connects the load cell units 1a to 1d to the communication line 3 via the communication control 10b and the communication driver receiver 11b.
Are requested in order by sequentially designating the individual numbers, and the sum of the weighed values collected from all the load cell units 1a to 1d via the communication line 3 is calculated by the weighing data processing unit 16. Output via the indicator interface 17.

The balance calculation data processing section 16 is configured as shown in FIG. 4, and is provided with a switch 18 as mode switching means for switching between an output value correction mode and an offset load adjustment value calculation mode.

In a normal use state, the switch 18
The mode has been switched to the output value correction mode P1 for supplying the raw data of each of the load cell units 1a to 1d to the processing means 19, and the raw data w1i to w4i of the load cell units 1a to 1d are output correction coefficients as follows. S1
The processing is performed in S4, the addition processing is performed, and the result is output as the measured weight Wi.

S1 · Δw1i + S2 · Δw2i + S3 · Δw3i + S4 · Δw4i = Wi Here, Δw1i is an output obtained by subtracting the output w1z of the load cell unit 1a in the no-load state from the raw data w1i, and can be expressed as “Δw1i = w1i−w1z”. Similarly, Δw2i to Δw4i are represented as follows.

Δw2i = w2i−w2z Δw3i = w3i−w3z Δw4i = w4i−w4z The output correction coefficients S1 to S4 are stored in the output correction coefficient storage means 20 in the following procedure after the load cell scale is installed at the place of use. Is set. Output correction coefficient storage means 20
An EEP-ROM is used as an example.

[Step. 1] The part that determines the output correction coefficients S1 to S4 is composed of a data storage unit 21 and a calculation unit 22. After installing the load cell type balance at the place of use, put the load 2 on the platform 2 in a no-load state, and operate the "*" key as a specific key to specify the calculation mode of the output correction coefficient from the keyboard of the indicator 4. Then, the switch 18 is switched to the side P2 of the data storage means 21 (the offset load adjustment value calculation mode), and the data storage means 21 reads the raw data w1i to w4i of each of the load cell units 1a to 1d. Here, the raw data of 100 times is read for each load cell unit in the digital conversion cycle, and the average value is taken as raw data w1z of each of the load cell units 1a to 1d when there is no load.
w4z is stored.

When the reading of w1z to w4z into the data storage means 21 is completed, the display of the indicator 4 changes to a content indicating that the weight is to be placed on the first specific location R1 of the platform 2. Here, the first specific location R1 is a position near the load cell 1a, and a quadrilateral formed by connecting the positions N1, N2, N3, and N4 of 1/2 of the side of the mounting table 2 as shown in FIG. 2 is an intersection R1 with a diagonal line Q1 connecting two opposing corners.

[Step. 2] When a weight is placed on the intersection R1 as the first specific place R1 and the "*" key as a specific key of the keyboard of the indicator 4 is operated, the data storage means 21 stores the load cells in each of the load cell units 1a to 1d. The data w1i to w4i are read, and the unloaded raw data w1z to w4z stored in the same data storage unit 21 are subtracted (w1i−w1z), (w2i−w2z), (w3i−w3z), and (w4i−). w4z) is calculated here for 100 times of the raw data w1i to w4i in the digital conversion cycle, and the first specific portion R1 is calculated.
Is the average value of the load cell units 1a to 1d in Δ
w11 to Δw41. Assuming that the weight value of the weight at this time is known and is M1, the following equation can be established.

M1 = S1 · Δw11 + S2 · Δw21 + S3 · Δw31 + S4 · Δw41 (1) When the storage of Δw1 to Δw4 is completed, the indicator 4 displays the weight on the second specific location R2 of the mounting table 2. It changes to the content instructing to do so. The second specific portion R2 is an intersection of a quadrilateral formed by connecting the positions N1, N2, N3, and N4 of the half of the side of the mounting table 2 and a diagonal line Q2 connecting opposite corners of the mounting table 2.

[Step. 3] [Step. When the weight used in [1] is moved to the second specific location R2 and the "*" key as a specific key on the keyboard of the indicator 4 is operated, the data storage means 21
Is the raw data w of each load cell unit 1a to 1d
1i to w4i and the same data storage means 2
1 is subtracted from the raw data w1z to w4z at the time of no load, and (w1i−w1z), (w2i−w2z), (w3i−w3z), and (w4i−w4z) are calculated by a digital conversion cycle. The second specific location R2 is performed for 100 times of raw data w1i to w4i.
Is the average value of the load cell units 1a to 1d in Δ
It is stored as w12 to Δw42. Assuming that the weight value of the weight at this time is known and M2, the following equation can be established.

M2 = S1Δw12 + S2Δw22 + S3Δw32 + S4Δw42 (2) [Step. 4] Similarly, [Step. When the weight used in [3] is moved to the third specific place R3 of the mounting table 2 and the "*" key as a specific key on the keyboard of the indicator 4 is operated, the third weight is obtained.
Load cell units 1a to 1 at a specific location R3
The average value of d is stored as Δw13 to Δw43. Assuming that the weight value of the weight at this time is known and M3, the following equation can be established.

M3 = S1 · Δw13 + S2 · Δw23 + S3 · Δw33 + S4 · Δw43 (3) The third specific portion R3 is a position N1, which is a half of the side of the mounting table 2.
This is the intersection of a quadrilateral formed by connecting N2, N3, and N4 with a diagonal line Q1 connecting the opposing corners of the mounting table 2.

[Step. 5] In addition, [Step. When the weight used in [4] is moved to the fourth specific location R4 of the mounting table 2 and the "*" key as a specific key of the keyboard of the indicator 4 is operated, the fourth weight is obtained.
Load cell units 1a to 1 at a specific location R4
The average value of d is stored as Δw14 to Δw44. Assuming that the weight value of the weight at this time is known and M4, the following equation can be established.

M4 = S1 · Δw14 + S2 · Δw24 + S3 · Δw34 + S4 · Δw44 (4) [Step. 6] The calculating means 22 calculates the output correction coefficients S1 to S4 using the above equations (1) to (4) as quaternary linear equations. In this embodiment, the weight of the weight is calculated as "M1 = M2 = M3 = M4 = 250 kg".

[Step. 7] The output correction coefficients S1 to S4 are written into the output correction coefficient storage means 20, and the switch 18 returns to the output value correction mode side P1 which supplies the processing means 19 with the raw data of each of the load cell units 1a to 1d. .

With this configuration, the appropriate output correction coefficients S1 to S4 can be obtained by merely changing the weight according to the display of the indicator 4 and operating the "*" key of the keyboard of the indicator 4 five times. The adjustment work can be completed by being automatically written to the storage means 20.

In the above embodiment, the weight of the weight is set to “M1
= M2 = M3 = M4 ”, but“ M1 ≠ M2 ≠ M
Even if 3 ≠ M4 ″, the output correction coefficients S1 to S4 can be calculated using the above equations (1) to (4) as quaternary linear equations and automatically written into the output correction coefficient storage unit 20.

In each of the above embodiments, the weights M1 to M
4 was known, but when the same weight was replaced on the first to fourth specific locations R1 to R4, the weight M1 of the weight was used.
M4 does not need to be known. When the same weight is used, the output correction coefficients S1 to S4 are similarly calculated by solving the quaternary linear equation obtained by connecting the right sides of the above equations (1) to (4) by an equal sign by the calculating means 22. Output correction coefficient storage means 2
It can be automatically written to 0. In this case, in the embodiment, the same weight is applied to the first to fourth specific portions R1 to R
Although the quaternary linear equation was solved based on the data collected by reloading on the 4th, by solving the quaternary linear equation based on the data collected by replacing the same weight on five or more places of the mounting table 2, The reliability of the output correction coefficients S1 to S4 is improved.

In each of the above embodiments, the solution of the quaternary linear equation calculated by the arithmetic means is described as being written unconditionally in the output correction coefficient storage means 20. A step of performing a verification process, and only when the solution satisfies a certain condition, the output correction coefficient storage means 2
By configuring to write 0, it is possible to prevent a decrease in the reliability of the measured weight Wi.

In this embodiment, output correction coefficients S1 to S4 are calculated in the above embodiment [Step. 6] and the output correction coefficients S1 to S4 are written in the output correction coefficient storage means 20 [Step. 7], [Step. 6a] to [Step. 6c].

[Step. 6a] The display on the indicator 4 changes to a content indicating that the weight is to be mounted on the fifth specific location R5 of the mounting table 2. The fifth specific location R5 is the intersection of the diagonal Q1 and the diagonal Q2. The previous [step. 6), the weight used in step 6 is moved to the center of the mounting table 2, and “*” as a specific key of the keyboard of the indicator 4 is used.
When the "" key is operated, .DELTA.w15.about..DELTA.
w45 is stored in the data storage unit 21. The weight value of the weight at this time is known and is set to M5. Δw15 to Δw45
Is completed, the display of the indicator 4 changes to the content for instructing the input of the resolution of the load cell type balance being adjusted.

[Step. 6b] Assuming that the resolution of the scale is “1/3000”, when “3000” is keyed in from the keyboard of the indicator 4 and the “*” key is operated as a specific key, the display of the indicator 4 indicates the weight. The content changes to an instruction for inputting a ratio between the weight and the weighing of the load cell type balance.

[Step. 6c] When the weight of the weight is “M5 = 250 Kg” and the weight is 1 t, “250 Kg / 1t = 25%
When "25" is keyed in from the keyboard of the indicator 4 from the calculation of "" and the "*" key as a specific key is operated, the output correction coefficient S1 calculated from the equations (1) to (4) is obtained.
In step S4 to step S4. 6) Δw15 to Δ
The calculation load m5 is calculated by processing w45 as follows.

S1 · Δw15 + S2 · Δw25 + S3 · Δw35 + S4 · Δw45 = m5 Further, the output correction coefficients S1 to S4 are substituted into the equations (1) to (4) to calculate m1 to m4 as follows.

S1 · Δw11 + S2 · Δw21 + S3 · Δw31 + S4 · Δw41 = m1 S1 · Δw12 + S2 · Δw22 + S3 · Δw32 + S4 · Δw42 = m2 S1 · Δw13 + S2 · Δw23 + S3 · Δw33 + Δw + S4 · Δ4 + S4ΔΔS4ΔΔS4ΔΔS3ΔΔS3ΔΔS4ΔΔS3ΔΔS3ΔΔS3ΔΔS3ｍΔS3ΔΔS3ｍΔS3ｍΔS3ｍΔS3ｍΔS3ｍΔS3ｍΔS3ｍΔS3ΔΔS3ΔΔS3ΔΔS3ｍΔS3ΔΔS3ｍΔS ΔΔS3ΔΔS3ΔΔS3ΔΔS ΔΔS m5 and m1, m2, m3, by comparing the m4, difference q ₁ between the calculated load _{m5, q 2, q 3,} q 4
Ask for. Based on the following determination values, it is determined whether or not the magnitude of the obtained errors q _{1 to} q ₄ is an allowable value.

The case of the test tolerance of the accuracy class M will be described as an example. (Scale resolution / weight weighing ratio) If> 2000, check whether the condition of ± 1.5 · (1 / scale resolution) is satisfied. 500 <(scale resolution / weight weighing ratio) <2000 for ± 1.0 • (1 / scale resolution) …… (6) 0 <(scale resolution / weight weighing ratio) <500 0.5 · (1 / Resolution of the balance) ………… Check if the condition of (7) is satisfied.

In the case of this embodiment, since (3000 · 25%) <2000, the error is determined based on the equation (6).

In this way, only the output correction coefficients S1 to S4 satisfying the allowable value are written to the output correction coefficient storage means 20. If the allowable value is not satisfied, the display of the indicator 4 indicates that the adjustment work is to be re-executed.
Writing of the calculated output correction coefficients S1 to S4 to the output correction coefficient storage unit 20 is not executed.

In the checking means of the above embodiment, the calculation load m
5 and m1, m2, m3, and m4, and the calculated load m
5, the differences q ₁ , q ₂ , q ₃ , and q ₄ were determined, and the determined errors q _{1 to} q ₄ were compared with the determination values to determine the reliability of the output correction coefficients S1 to S4. By comparing the weight value M5 with the calculated loads m1, m2, m3, m4, and m5,
Differences q ₁ , q ₂ , q ₃ , q ₄ , of the weight from the weight value M5,
seeking q _5, to determine the reliability of the error obtained q ₁ to q ₅ and the output is compared with the determination value correction coefficient S1 to S4,
If the allowable value is not satisfied, the indication on the indicator 4 indicates that the adjustment work is to be re-executed, and the calculated output correction coefficients S1 to S4 are written into the output correction coefficient storage means 20. It can also be configured not to.

In the above embodiment, the data storage means 21 stores the output of each of the load cell units 1a to 1d in a no-load state in which no measurement load is applied to the mounting table 2 and stores the output at a plurality of arbitrary positions on the mounting table 2. The deviation weight between the output of each of the load cell units 1a to 1d when a weight having a known weight is sequentially loaded and the output in a no-load state is stored. This is achieved by measuring the data storage unit 21 on the mounting table 2. The output of each of the load cell units 1a to 1d in a no-load state where no load is applied is stored, and
Is configured to store the output of each of the load cell units when a weight having a known weight is sequentially loaded at a plurality of arbitrary positions. The same applies to a configuration in which an output correction coefficient of each load cell unit is calculated by calculating a deviation weight between the output of each load cell unit 1a to 1d when the weight is loaded and the output in the no-load state.

In each of the above embodiments, [Step. 6b]
[Step. 6c], the resolution, the weight of the weight, and the weighing are keyed in. However, the input operation can be omitted by writing the data in the data storage means 21 in advance.

In each of the above-described embodiments, the number of load cell units is four, and weights are sequentially placed on four places on the mounting table 2.
The raw data w1i to w4i are read, but when the number of load cell units is N, at least
Weights are placed on N places in the order above, and raw data w1i to w
The measured weight Wi can be obtained by reading Ni and obtaining the output correction coefficients S1 to SN.

[0050]

As described above, according to the configuration of the first aspect and the method of the third aspect, the output of each load cell unit in a no-load state where no load is placed on the mounting table after the balance is installed, and the plurality of arbitrary positions of the mounting table. With the simple operation of reading the output of each load cell unit when a weight with a known weight is sequentially loaded at the position, the geometrical characteristics of the load transmission mechanism, such as the levelness of the foundation surface when installing the scale at the place of use, Adjustment of the sensitivity of each load cell unit corresponding to the dynamic deviation can be realized.In addition, just by placing a weight on the center of the mounting table , the calculated output correction coefficient is accurately calculated and an appropriate output correction coefficient is obtained. It is possible to adjust the load with high accuracy and good workability.

According to the second aspect of the present invention, it is possible to perform the adjustment work satisfactorily while switching between the output value correction mode and the offset load adjustment value calculation mode by the mode switching means. Work efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a load cell scale according to the present invention.

FIG. 2 is a schematic configuration diagram of the embodiment.

FIG. 3 is an external perspective view of the embodiment.

FIG. 4 is a configuration diagram of a main part of the embodiment.

FIG. 5 is a plan view of the mounting table showing a mounting position of the weight according to the embodiment.

[Explanation of symbols]

 1a to 1d load cell unit 2 mounting table 3 communication line 4 indicator 16 weighing calculation data processing unit 19 processing means 20 output correction coefficient storage means 21 data storage means 22 calculation means

Claims (3)

(57) [Claims] 1. A load cell scale which supports a mounting table with a plurality of load cell units, calculates a measured load of each load cell unit, and measures a measured load of the object mounted on the table. The output of each load cell unit for each mounting location obtained by replacing weights a plurality of times at a plurality of positions and the output of each load cell unit in a no-load state where no weight is placed on the table are stored. Storage means for performing the same operation for each load cell unit based on the output of each load cell unit and the output of each load cell unit for each mounting location obtained by replacing weights a plurality of times when no load is applied. a calculating means for calculating an output correction factor for each load cell unit, in the mounting base by using the output correction coefficient for each load cell unit
Calculated a weight of correcting the amount of copper the output of each load cell unit in a state carrying the weight on the central, and calculating the weight of the weight, weight several times loaded recombinant-obtained each load cell unit before each described local disks Each output is corrected with the output correction coefficient and compared with each calculated weight obtained by summing.If the difference between the calculated weights exceeds a certain reference value, it is determined that the calculated output correction coefficient is inappropriate. Check means for instructing re-execution of the adjustment work, output correction coefficient storage means for storing the output correction coefficient of each load cell unit when the obtained output correction coefficient is appropriate, and output correction coefficient storage means A load cell type balance provided with processing means for correcting the outputs of the respective load cell units during weight measurement using the output correction coefficient. 2. The load cell type balance according to claim 1, further comprising mode switching means for switching between an output value correction mode for displaying the measured load and an offset load adjustment value calculation mode for adjusting the offset load. 3. A method for supporting a mounting table with a plurality of load cell units, calculating a measured load of each load cell unit, and adjusting a load of a load cell type scale for measuring a measured load of the object mounted on the table. The output of each load cell unit for each mounting location obtained by replacing weights a plurality of times at a plurality of positions on the table and the load cells in a no-load state where no weight is placed on the table. The output for each unit is stored, and the sensitivity of each load cell unit is calculated from the output of each load cell unit and the output of each load cell unit for each mounting location obtained by replacing weights a plurality of times when no load is applied. and computing an output correction factor for each load cell unit for aligning, in the mounting base by using the output correction coefficient for each load cell unit
Calculated a weight of correcting the amount of copper the output of each load cell unit in a state carrying the weight on the central, and calculating the weight of the weight, weight several times loaded recombinant-obtained each load cell unit before each described local disks Each output is corrected with the output correction coefficient and compared with each calculated weight obtained by summing.If the difference between the calculated weights exceeds a certain reference value, it is determined that the calculated output correction coefficient is inappropriate. Instruct the re-execution of the adjustment work, store the output correction coefficient of each load cell unit when the obtained output correction coefficient is appropriate, and at the time of load measurement, the output correction coefficient written in the output correction coefficient storage means. A method for adjusting the load of a load cell type balance, in which the outputs of the respective load cell units are corrected and then summed up at the time of weight measurement to output the total value.