A range correction system, device and range correction method

Abstract

The application discloses a range correction system, a range correction device and a range correction method. The range correction system comprises four high-precision electronic scales and standard weights. The range correction device comprises a bottom shell and a power module, a main control module, a display module, standard weights and four weighing modules arranged in the bottom shell. The high-precision electronic scales and the weighing modules are used for collecting the weight components W1-W4 of the standard weights on the corresponding weighing sensors of the electronic scales to be calibrated. By adopting the mode of independently collecting the weight components of each weighing sensor, four independent weight conversion coefficients C1-C4 are respectively calibrated, and the total weight is calculated. Even if the heavy object is subjected to partial load, the sensor under large stress contributes a lot, and the sensor under small stress contributes a little. After weighting, the real total weight can still be restored, and the problem of large partial load error of the traditional model is effectively solved. The full-range error of the electronic scale to be calibrated is less than or equal to ±0.2 kg, the repeatability error is less than or equal to ±0.1 kg, the calibration process can be semi-automated, and the calibration efficiency of batch production is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of electronic scale technology, and in particular to a range calibration system, device and range calibration method. Background Technology

[0002] Electronic body scales and body fat scales are common household measuring instruments, and their measurement accuracy directly affects the user experience. Currently, mainstream four-sensor smart body fat scales (such as those from Xiaomi, Huawei, and Yunmai) all use the standard mathematical model of a multi-sensor weighing system: W=k1V1+k2V2+k3V3+k4V4, where V1~V4 are the raw physical outputs of the four weighing sensors, and k1~k4 are the corresponding calibration coefficients. In practical applications, this model relies solely on the total weight and total AD value for coefficient calibration, without considering the independent weight component of each sensor.

[0003] When the object being weighed is off-center (e.g., a person standing on the scale is tilted to one corner), the force on the four weighing sensors will be significantly uneven. The traditional weighted summation method cannot effectively compensate for this force difference, resulting in a significant increase in measurement error, usually with a large off-center load error. In addition, existing calibration methods mostly use manual single-point calibration, which is inefficient and has unstable accuracy, making it difficult to meet the needs of mass production.

[0004] Therefore, there is an urgent need for a range calibration system, device, and method that can effectively compensate for off-center load errors, and has high calibration accuracy and efficiency. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a range correction system, apparatus, and range correction method.

[0006] One embodiment of the present invention provides a technical solution to solve its technical problem: a range calibration system comprising four high-precision electronic scales and standard weights; The upper surface of the horizontal rigid platform is divided into 4 independent placement areas; Four high-precision electronic scales are placed in four designated areas to ensure that the upper surfaces of the four scales are on the same horizontal plane. The scale to be calibrated is supported on the upper surfaces of the four scales. The standard weights are supported at the center of the electronic scale to be calibrated; High-precision electronic scales are used to collect the weight components W1~W4 of standard weights on the weighing sensor corresponding to the weighing scale to be calibrated.

[0007] A range calibration device includes a base shell and a power module, a main control module, a display module and four weighing modules disposed inside the base shell, and also includes standard weights. The power supply module is electrically connected to the main control module, display module, and weighing module. Weighing modules are evenly distributed at the four corners of the bottom shell and electrically connected to the main control module. The electronic scale to be calibrated is supported on four weighing modules at the same time. The standard weight is supported on the electronic scale to be calibrated. The weighing modules are used to collect the weight components W1~W4 of the standard weight on the corresponding weighing sensor on the electronic scale to be calibrated. The display module is electrically connected to the main control module; The main control module can display the weight components W1~W4 through the display module.

[0008] As one of the preferred embodiments of the present invention, the range calibration device further includes a data storage module electrically connected to the main control module.

[0009] As one of the preferred embodiments of the present invention, the range calibration device further includes a communication module electrically connected to the main control module for data transmission with the host computer.

[0010] A range calibration method, employing the aforementioned range calibration system, performs the following steps: S1. Place the electronic scale to be calibrated on the range calibration system so that the four scale feet of the electronic scale to be calibrated correspond to the four high-precision electronic scales respectively. S2. With the electronic scale to be calibrated unloaded, record the unloaded AD value of each weighing sensor, denoted as AD. 10 AD 20 AD 30 AD 40 The effective AD value is the original AD value of the corresponding channel minus the unloaded AD value; S3. Load standard weights of different weights sequentially at the center position of the electronic scale to be calibrated. Record the effective AD values ​​(AD1~AD4) of the four weighing sensors and the corresponding weight components (W1~W4) after each loading. According to the formula W... i =C i AD i Calculate the weight conversion coefficients C1~C4 for each of the four weighing sensors; S4. Write the calculated coefficients C1~C4 into the storage unit of the electronic scale to be calibrated. After powering on again, use standard weights to verify the full range. If the accuracy requirements are met, the calibration is complete.

[0011] As one of the preferred embodiments of the present invention, in step S1, the angle difference is compensated before placing the electronic scale to be calibrated on the range calibration system.

[0012] As one of the preferred embodiments of the present invention, in step S3, each set of standard weights is repeatedly loaded 3 times, and the average value of the effective AD value is taken.

[0013] A range calibration method, employing the aforementioned range calibration device, performs the following steps: S1. Place the electronic scale to be calibrated on the range calibration device so that the four weighing feet of the electronic scale to be calibrated correspond to the four weighing modules respectively. S2. With the electronic scale to be calibrated unloaded, record the unloaded AD value of each weighing sensor, denoted as AD. 10 AD 20 AD 30 AD 40 The effective AD value is the original AD value of the corresponding channel minus the unloaded AD value; S3. Load standard weights of different weights sequentially at the center position of the electronic scale to be calibrated. Record the effective AD values ​​(AD1~AD4) of the four weighing sensors and the corresponding weight components (W1~W4) after each loading. According to the formula W... i =C i AD i Calculate the weight conversion coefficients C1~C4 for each of the four weighing sensors; S4. Write the calculated coefficients C1~C4 into the storage unit of the electronic scale to be calibrated. After powering on again, use standard weights to verify the full range. If the accuracy requirements are met, the calibration is complete.

[0014] As one of the preferred embodiments of the present invention, in step S1, the angle difference is compensated before placing the electronic scale to be calibrated on the range calibration device.

[0015] As one of the preferred embodiments of the present invention, in step S3, each set of standard weights is repeatedly loaded 3 times, and the average value of the effective AD value is taken.

[0016] The beneficial effects of this invention are as follows: A range calibration system, device, and method are provided. The range calibration system includes four high-precision electronic scales and standard weights. The range calibration device includes a base shell and a power module, a main control module, a display module, standard weights, and four weighing modules housed within the base shell. The high-precision electronic scales and weighing modules are used to collect the weight components W1~W4 of the standard weights on the weighing sensors corresponding to the weighing sensors on the electronic scale to be calibrated. By independently collecting the weight components of each weighing sensor, four independent weight conversion coefficients C1~C4 are calibrated separately, and then the total weight is calculated. Even if the load is off-center, the sensor with greater force contributes more, and the sensor with less force contributes less. After weighting, the true total weight can still be restored, effectively solving the problem of large off-center loading errors in traditional models. This allows the full-range error of the electronic scale to be calibrated to be ≤±0.2kg and the repeatability error to be ≤±0.1kg. At the same time, the calibration process can be semi-automated, significantly improving the calibration efficiency of mass production. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a range calibration system; Figure 2 This is a schematic diagram of the first structure of a first embodiment of a range calibration device; Figure 3 This is a second structural schematic diagram of a first embodiment of a range calibration device; Figure 4 This is a schematic diagram of the first structure of a second embodiment of a range calibration device; Figure 5 This is a schematic diagram of the second structure of a second embodiment of a range calibration device; Figure 6 This is a block diagram illustrating the principle of a range calibration device. Detailed Implementation

[0018] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0019] In the description of this invention, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0020] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integrally formed connection; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] Example 1: Refer to Figure 1 This embodiment provides a range calibration system for accurately calibrating the range of an electronic scale (such as a home body fat scale) before it leaves the factory.

[0023] The system includes four high-precision electronic scales 10 and one standard weight 20. The accuracy of the four high-precision electronic scales 10 should be at least one order of magnitude better than that of the electronic scale to be calibrated (for example, if the accuracy of the scale to be calibrated is ±0.1kg, then the accuracy of the high-precision electronic scales 10 should reach ±0.01kg) to ensure the accuracy of the calibration reference.

[0024] The upper surface of a horizontal hard platform 30 (such as a marble platform to ensure flatness) is divided into four independent placement areas 31. Four high-precision electronic scales 10 are placed in the four placement areas 31 respectively. The upper surfaces of the four high-precision electronic scales 10 are kept on the same horizontal plane by adjusting the feet of the high-precision electronic scales 10 or by using a level to assist in calibration.

[0025] The scale to be calibrated is simultaneously supported on the upper surfaces of four high-precision scales 10, and it is necessary to ensure that the four weighing feet of the scale to be calibrated correspond to one of the high-precision scales 10 below. The standard weight 20 is placed on the upper surface of the scale to be calibrated. When the standard weight 20 is loaded, due to the structure of the scale to be calibrated, the four weighing sensors inside will deform due to the force, and the deformation will be transmitted to the four high-precision scales 10 below through the weighing feet. Therefore, the values ​​displayed by the four high-precision scales 10 are W1 to W4, which are the weight components of the standard weight 20 on the scale to be calibrated corresponding to the four sensors.

[0026] The system in this embodiment can independently and accurately obtain the weight component of each sensor under a known total weight (the weight of a standard weight), providing a physical quantity benchmark for the subsequent independent calculation of the conversion coefficient of each sensor.

[0027] Example 2: Refer to Figures 2-3 , Figure 6 This embodiment provides an integrated range calibration device, which includes a base shell 41, and a power module 42, a main control module 43, a display module 44, four weighing modules 45, a data storage module 46, and a communication module 47 (such as a serial interface, USB interface, or Bluetooth module) disposed inside the base shell 41. In addition, it also includes a standard weight 20 for use with the device. Furthermore, the weighing modules 45 (weighing sensors) are built into the upper cover 50 which is movably connected to the base shell 41, and the weighing feet of the electronic scale to be calibrated are supported on the upper surface of the upper cover 50.

[0028] The power supply module 42 is electrically connected to the main control module 43, the display module 44, and the four weighing modules 45 to provide a stable working voltage (such as DC5V and 3.3V). The four weighing modules 45 are evenly distributed and fixed at the four corners of the bottom shell 41. Each weighing module 45 contains a high-precision weighing sensor and its signal conditioning circuit. The weighing sensor is electrically connected to the main control module 43 through wires.

[0029] During the calibration operation, the operator places the electronic scale to be calibrated on the base shell 41, with its four weighing feet supporting the four weighing modules 45 of the device, and then places the standard weight 20 on the upper surface of the electronic scale to be calibrated. At this time, the four weighing modules 45 respectively collect the weight signal applied by the standard weight 20 and transmitted through the electronic scale to be calibrated, and obtain the raw data of weight components W1~W4 after analog-to-digital conversion, and send it to the main control module 43. After processing the data, the main control module 43 displays the specific values ​​of the four weight components on the display module 44 in real time.

[0030] Operators can read and record these values ​​for subsequent calculations; the data storage module 46 stores the device's own calibration parameters and temporarily collected data, while the communication module 47 can upload the collected four-channel weight component data to the host computer in real time, realizing automated data processing and recording, thereby achieving semi-automation of the calibration process and greatly improving the calibration efficiency of mass production.

[0031] Example 3: Reference Figures 4-6 This embodiment provides an integrated range calibration device. The difference between this embodiment and embodiment 2 is that the weighing module 45 (weighing sensor) is externally placed below the upper cover 50 which is movably connected to the bottom shell 41, and the scale feet of the electronic scale to be calibrated are supported on the upper end surface of the upper cover 50.

[0032] This embodiment details a method for calibrating the range of an electronic scale to be calibrated using the range calibration system described in Embodiment 1, the range calibration device described in Embodiment 2, or the range calibration device described in Embodiment 3. The method is illustrated using Embodiment 2 or 3 as an example. Specifically: 1. Calibration Preparation Use the range calibration device described in Example 2, and ensure that it has been preheated and passed the self-test; environmental requirements: room temperature is stable between 15℃ and 30℃, and there is no strong vibration or air flow interference.

[0033] Pre-processing of the electronic scale to be calibrated: Before placing the electronic scale to be calibrated on the range calibration device, it is first subjected to corner difference compensation; corner difference compensation is a standard procedure before the electronic scale leaves the factory. Its purpose is to adjust the software parameters under no-load and loaded conditions so that when the same weight is placed at different positions on the scale surface, the total display value of the scale is basically the same. Completing corner difference compensation is a prerequisite for ensuring the subsequent four-coefficient calibration effect of this invention.

[0034] Placement: Place the electronic scale to be calibrated, after the angle difference compensation has been completed, on the range calibration device, so that its four weighing feet are supported on the four weighing modules 45 of the device respectively.

[0035] 2. Zero point calibration When the electronic scale to be calibrated is in an unloaded state, the original AD value of each weighing sensor (output by the sensor itself, without processing) is recorded via the host computer of the device or by directly reading its internal register, and is denoted as AD. 10 AD 20 AD 30 AD 40 The effective AD value used in subsequent calculations is defined as the real-time raw AD value of each channel minus its corresponding idle AD value, i.e., the effective AD value. i =Original AD i -AD i0 This step can eliminate the influence of the sensor's initial zero-point drift on the measurement, and is particularly effective when measuring small weights.

[0036] 3. Full-scale calibration and coefficient calculation At the center of the electronic scale to be calibrated, load standard weights 20 of different weights in ascending order. To obtain a more accurate linear relationship, it is recommended to load weights at no less than 3 different weight points. In this embodiment, 9 points of weights, namely 1000g, 1500g, 2000g, 2500g, 3000g, 3500g, 4000g, 4500g, and 5000g, are used as examples for illustration.

[0037] For each weight point, the loading is repeated three times, and the stable effective AD values ​​(AD1, AD2, AD3, AD4) of the four weighing sensors are recorded after each loading. Simultaneously, the weight components (W1, W2, W3, W4) corresponding to each sensor are directly read and recorded using the range correction device or system of this invention. For each weight point, the effective AD value and weight component values ​​from the three measurements are averaged to obtain the average effective AD value (AD) at that weight point. i and average weight component W i .

[0038] According to formula W i =C i ADi The conversion coefficient C for each sensor at that weight point can be derived. i =W i / AD i .

[0039] ① For example, for a calibration point of 1000g, if the weight components read from the four sensors are W1=254.7g, W2=248.8g, W3=255.2g, and W4=240.5g, and the corresponding average effective AD values ​​are AD1=499.212, AD2=485.16, AD3=500.192, and AD4=464.165, then the following can be calculated: C1=0.510204082 C2=0.512820513 C3=0.510204082 C4=0.518134715 ② For example, for a calibration point of 1500g, if the weight components read from the four sensors are W1=382.6g, W2=361.8g, W3=381.4g, and W4=373.5g, and the corresponding average effective AD values ​​are AD1=749.896, AD2=701.892, AD3=743.73, and AD4=728.325, then the following can be calculated: C1=0.510204082 C2=0.515463918 C3=0.512820513 C4=0.512820513 ③ For example, for a calibration point of 2000g, if the weight components read from the four sensors are W1=485.0g, W2=477.5g, W3=526.6g, and W4=509.6g, and the corresponding average effective AD values ​​are AD1=940.9, AD2=926.35, AD3=1026.87, and AD4=993.72, then the following can be calculated: C1=0.515463918 C2=0.515463918 C3=0.512820513 C4=0.512820513 ④ For example, for a calibration point of 2500g, if the weight components read from the four sensors are W1=632.6g, W2=601.4g, W3=648.0g, and W4=617.3g, and the corresponding average effective AD values ​​are AD1=1233.57, AD2=1166.716, AD3=1270.08, and AD4=1197.562, then the following can be calculated: C1=0.512820513 C2=0.515463918 C3=0.510204082 C4=0.515463918 ⑤ For example, for a calibration point of 3000g, if the weight components read from the four sensors are W1=782.3g, W2=726.6g, W3=755.6g, and W4=734.6g, and the corresponding average effective AD values ​​are AD1=1541.131, AD2=1402.338, AD3=1473.42, and AD4=1425.124, then the following can be calculated: C1=0.512820513 C2=0.518134715 C3=0.512820513 C4=0.515463918 ⑥ For example, for a calibration point of 3500g, if the weight components read from the four sensors are W1=884.1g, W2=815.3g, W3=904.4g, and W4=895.6g, and the corresponding average effective AD values ​​are AD1=1723.995, AD2=1581.682, AD3=1772.624, and AD4=1755.376, then the following can be calculated: C1=0.512820513 C2=0.515463918 C3=0.510204082 C4=0.510204082 ⑦ For example, for a calibration point of 4000g, if the weight components read from the four sensors are W1=1096.0g, W2=957.0g, W3=971.3g, and W4=975.2g, and the corresponding average effective AD values ​​are AD1=2159.12, AD2=1866.15, AD3=1903.748, and AD4=1911.392, then the following can be calculated: C1=0.507614213 C2=0.512820513 C3=0.510204082 C4=0.510204082 ⑧ For example, for a calibration point of 4500g, if the weight components read from the four sensors are W1=1123.0g, W2=1131.0g, W3=1128.0g, and W4=1117.0g, and the corresponding average effective AD values ​​are AD1=2201.08, AD2=2205.45, AD3=2188.32, and AD4=2166.98, then the following can be calculated: C1=0.510204082 C2=0.512820513 C3=0.515463918 C4=0.515463918 ⑨ For example, for a calibration point of 5000g, if the weight components read from the four sensors are W1=1349g, W2=1202g, W3=1229g, and W4=1220g, and the corresponding average effective AD values ​​are AD1=2630.55, AD2=2331.88, AD3=2396.55, and AD4=2379, then the following can be calculated: C1=0.512820513 C2=0.515463918 C3=0.512820513 C4=0.512820513 C calculated at different weight points i The value should remain basically constant, and its average value should be taken as the final conversion coefficient of the sensor. Then, mathematical methods such as linear regression are used to apply the conversion coefficient to all weight points (W). i AD i By fitting the data pairs, a more accurate C can be obtained. i This allows for high-precision calibration across the entire range.

[0040] 4. Writing and Verification The four independent conversion coefficients C1, C2, C3, and C4 obtained at the end are written into the storage unit (such as EEPROM) of the electronic scale to be calibrated through a programmer or communication interface. After writing is completed, the electronic scale to be calibrated is powered on again. Then, standard weights 20 are placed at different positions on the scale surface (center, near angle 1, near angle 3, etc.), the final displayed weight of the electronic scale is recorded, and compared with the actual weight of the standard weights.

[0041] The verification results should meet the following requirements: full-range error ≤ ±0.2kg, repeatability error ≤ ±0.1kg. If the above accuracy requirements are met, the calibration is complete; otherwise, the angular difference compensation or calibration process needs to be checked and recalibrated.

[0042] Using the above method, since C1~C4 are calibrated independently for each sensor, when the load is unevenly loaded, the sensor with greater force contributes more and the sensor with less force contributes less. The total weight calculated by weighted summation = C1·AD1+C2·AD2+C3·AD3+C4·AD4 can still accurately restore the real weight, thus overcoming the defect of large error in traditional models under uneven loading conditions.

[0043] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A range calibration system, characterized in that: Includes 4 high-precision electronic scales (10) and standard weights (20); The upper surface of the horizontal rigid platform (30) is divided into 4 independent placement areas (31). The four high-precision electronic scales (10) are respectively placed in the four placement areas (31) so that the upper surfaces of the four high-precision electronic scales (10) are on the same horizontal plane, and the electronic scale to be calibrated is supported on the upper surfaces of the four high-precision electronic scales (10). The standard weight (20) is supported at the center of the electronic scale to be calibrated; The high-precision electronic scale (10) is used to collect the weight components W1~W4 of the standard weight (20) on the weighing sensor corresponding to the weighing sensor on the electronic scale to be calibrated.

2. A range calibration device, characterized in that: It includes a bottom shell (41) and a power module (42), a main control module (43), a display module (44) and four weighing modules (45) disposed in the bottom shell (41), and also includes standard weights (20). The power module (42) is electrically connected to the main control module (43), the display module (44), and the weighing module (45); The weighing modules (45) are evenly distributed at the four corners of the bottom shell (41) and electrically connected to the main control module (43). The electronic scale to be calibrated is supported on four weighing modules (45) at the same time. The standard weight (20) is supported on the electronic scale to be calibrated. The weighing modules (45) are used to collect the weight components W1~W4 of the standard weight (20) on the weighing sensor corresponding to the weighing sensor on the electronic scale to be calibrated. The display module (44) is electrically connected to the main control module (43); The main control module (43) can display the weight components W1~W4 through the display module (44).

3. The range calibration device according to claim 2, characterized in that: It also includes a data storage module (46) electrically connected to the main control module (43).

4. The range calibration device according to claim 2, characterized in that: It also includes a communication module (47) electrically connected to the main control module (43) for data transmission with the host computer.

5. A range calibration method, characterized in that: Using the range calibration system as described in claim 1, the following steps are performed: S1. Place the scale to be calibrated on the range calibration system so that the four feet of the scale to be calibrated correspond to the four high-precision scales (10). S2. With the electronic scale to be calibrated unloaded, record the unloaded AD value of each weighing sensor, denoted as AD. 10 AD 20 AD 30 AD 40 The effective AD value is the original AD value of the corresponding channel minus the unloaded AD value; S3. Load standard weights (20) of different weights sequentially at the center position of the electronic scale to be calibrated, and record the effective AD values ​​AD1~AD4 of the four weighing sensors and the corresponding weight components W1~W4 after each loading. According to the formula W i =C i AD i Calculate the weight conversion coefficients C1~C4 for each of the four weighing sensors; S4. Write the calculated coefficients C1~C4 into the storage unit of the electronic scale to be calibrated. After powering on again, use the standard weight (20) to verify the full range. If the accuracy requirements are met, the calibration is complete.

6. The range calibration method according to claim 5, characterized in that: In step S1, the angle difference is compensated before placing the electronic scale to be calibrated on the range calibration system.

7. The range calibration method according to claim 5, characterized in that: In step S3, each set of standard weights (20) is loaded 3 times, and the average value of the effective AD value is taken.

8. A range calibration method, characterized in that: Using the range calibration device as described in any one of claims 2-4, the following steps are performed: S1. Place the electronic scale to be calibrated on the range calibration device so that the four weighing feet of the electronic scale to be calibrated correspond to the four weighing modules (45). S2. With the electronic scale to be calibrated unloaded, record the unloaded AD value of each weighing sensor, denoted as AD. 10 AD 20 AD 30 AD 40 The effective AD value is the original AD value of the corresponding channel minus the unloaded AD value; S3. Load standard weights (20) of different weights sequentially at the center position of the electronic scale to be calibrated, and record the effective AD values ​​AD1~AD4 of the four weighing sensors and the corresponding weight components W1~W4 after each loading. According to the formula W i =C i AD i Calculate the weight conversion coefficients C1~C4 for each of the four weighing sensors; S4. Write the calculated coefficients C1~C4 into the storage unit of the electronic scale to be calibrated. After powering on again, use the standard weight (20) to verify the full range. If the accuracy requirements are met, the calibration is complete.

9. The range calibration method according to claim 8, characterized in that: In step S1, the angle difference is compensated before placing the electronic scale to be calibrated on the range calibration device.

10. The range calibration method according to claim 8, characterized in that: In step S3, each set of standard weights (20) is loaded 3 times, and the average value of the effective AD value is taken.

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