CN110879097A - Portable scale and calibration method and measurement method thereof - Google Patents
Portable scale and calibration method and measurement method thereof Download PDFInfo
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- CN110879097A CN110879097A CN201910992038.4A CN201910992038A CN110879097A CN 110879097 A CN110879097 A CN 110879097A CN 201910992038 A CN201910992038 A CN 201910992038A CN 110879097 A CN110879097 A CN 110879097A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/01—Testing or calibrating of weighing apparatus
- G01G23/012—Testing or calibrating of weighing apparatus with load cells comprising in-build calibration weights
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/40—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight
- G01G19/413—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means
- G01G19/414—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means using electronic computing means only
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Abstract
The invention particularly relates to a portable scale, a calibration method and a measurement method thereof, and belongs to the technical field of portable scales. The device comprises a sensor, a micro control unit, a display, a buzzer and a key unit; the key unit is used for starting and stopping the micro control unit; the micro-control unit drives the sensor; the micro control unit comprises an ADC unit, a calculating unit and a storage unit; the sensor is used for collecting a tension signal and outputting an analog electric signal to the ADC unit; the ADC unit is used for ADC sampling, converting the analog electric signal into a digital electric signal and inputting the sampled digital electric signal into the computing unit; and the calculating unit calls the calibration value and the signal sampling value in the storage unit to carry out analysis and calculation, then outputs the weight value to the display to carry out weight display, and drives the buzzer. The calibration method adopts secondary calibration including the calibration of a preset calibration value and an actual standard weight value. The invention improves the weighing measurement accuracy and precision of the portable scale and reduces the weighing measurement error.
Description
Technical Field
The invention particularly relates to a portable scale, a calibration method and a measurement method thereof, and belongs to the technical field of portable scales.
Background
The portable scale is also called as a portable electronic scale, which is mainly characterized by light weight, thinness, shortness, smallness and convenient carrying, and is widely applied to light industry, electronics, chemical industry, trade and daily life. The portable electronic scale adopts an electronic weighing device integrating modern sensor technology, electronic technology and computer technology, can meet and solve the 'quick, accurate, continuous and automatic' weighing requirement in real life, and effectively eliminates human errors, so that the portable electronic scale is more in line with the application requirements of legal metering management and industrial production process control. With the development of the times, the traditional mechanical portable scale and the spring scale are gradually replaced by the electronic portable scale. The range of scales currently on the market varies from 5kg to 40 kg, indicating a division value between 5 g and 20 g. The portable electronic scale has a large weighing range, and if the portable electronic scale is calibrated only once due to the nonlinearity of the sensor, the portable electronic scale has a large error under the condition of light weight of an article.
Disclosure of Invention
The invention provides a portable scale, a calibration method and a measurement method thereof, aiming at solving the problems that the nonlinearity of a sensor of the conventional portable electronic scale is only calibrated once, and the error is large under the condition of light weight of an article.
In order to achieve the purpose, the invention adopts the following technical scheme:
a portable scale comprises a sensor, a micro control unit, a display, a buzzer and a key unit; the key unit is used for starting and stopping the micro control unit; the micro control unit drives the sensor; the micro control unit comprises an ADC unit, a calculating unit and a storage unit; the sensor is used for collecting a tension signal and outputting an analog electric signal to the ADC unit; the ADC unit is used for ADC sampling, converting the analog electric signal into a digital electric signal and inputting the sampled digital electric signal into the computing unit; and the calculating unit calls the calibration value and the signal sampling value in the storage unit to carry out analysis and calculation, then outputs the weight hanging value to the display to carry out weight display, and drives the buzzer.
Further, as a preferred technical solution of the present invention, the present invention further comprises an external memory; the output end of the computing unit is connected with the input end of the external memory; the external memory adopts an E2PROM memory.
Further, as a preferred technical solution of the present invention, the storage unit employs a BIE internal memory.
Further, as a preferred technical solution of the present invention, the ADC unit employs an ADC converter.
Further, as a preferable technical scheme of the invention, the display adopts an LCD liquid crystal display screen.
The calibration method based on the portable scale comprises the following steps: step 1, collecting a tension signal in no-load by a sensor, and outputting an electric signal to an ADC unit; step 2, the ADC unit samples signals, records the signal sampling value of the ADC unit as a no-load ADC value ADC _0 and inputs the signal sampling value into the calculation unit; step 3, the calculation unit inputs the ADC value ADC _0 into the storage unit; step 4, a preset CAL5 is arranged in the storage unit, and the calculation unit calls the preset CAL5 in the storage unit and displays the CAL5 through a display; step 5, collecting a tension signal with a hanging weight of 5kg by a sensor, and outputting an electric signal to an ADC unit; step 6, the ADC unit samples signals, the sampling time is more than or equal to 3 seconds, the signal sampling value of the ADC unit is recorded as a first calibrated ADC value ADC _5kg, and the first calibrated ADC value ADC _5kg is input into the calculation unit; when the sampling time is less than 3 seconds, returning to the step 5; step 7, inputting the first calibrated ADC value ADC _5kg into a storage unit by a calculation unit; step 8, a preset CAL20 is arranged in the storage unit, and the calculation unit calls the preset CAL20 in the storage unit and displays the CAL20 through a display; step 9, collecting a tension signal with a hanging weight of 20kg by a sensor, and outputting an electric signal to an ADC unit; step 10, the ADC unit samples signals, the sampling time is more than or equal to 3 seconds, the signal sampling value of the ADC unit is recorded as a second calibrated ADC value ADC _20kg, and the second calibrated ADC value ADC _20kg is input into the calculation unit; when the sampling time is less than 3 seconds, returning to the step 9; step 11, inputting a second calibration ADC value ADC _20kg into a storage unit by a calculation unit; and step 12, the storage unit stores the idle ADC value ADC _0, the first calibration ADC value ADC _5kg and the second calibration ADC value ADC _20 kg.
The measuring method based on the calibration method of the portable scale comprises the following steps: step 1, collecting a tension signal when a weight is hung by a sensor, and outputting an electric signal to an ADC unit; step 2, the ADC unit samples signals, the signal sampling time is more than or equal to 3 seconds, and the signal sampling value of the ADC unit is recorded as a hanging weight ADC value ADC _ v and is input into the calculation unit;
step 3, when the hanging weight ADC value ADC _ V is greater than or equal to the no-load ADC value ADC _0 and the hanging weight ADC value ADC _ V is less than the first calibrated ADC value ADC _5kg, the calculation formula of the hanging weight value V is as follows:
V＝5×(adc_v-adc_0)/(adc_5kg-adc_0)
wherein ADC _ v is a weight-on ADC value; ADC _0 is the no-load ADC value; ADC _5kg is the first calibrated ADC value;
when the hanging weight ADC value ADC _ V is greater than or equal to the first calibration ADC value ADC _5kg, the calculation formula of the hanging weight value V is as follows:
V＝20×(adc_v-adc_0)/(adc_20kg-adc_0)
wherein ADC _ v is a weight-on ADC value; ADC _0 is the no-load ADC value; ADC _20kg is the second calibrated ADC value;
and 4, outputting the hanging weight value to a display by the calculating unit for weight display.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects: according to the technical scheme, the weighing measurement accuracy and the weighing measurement precision of the portable scale are improved, and the weighing measurement error is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of a calibration method of the present invention;
FIG. 3 is a flow chart of a measurement method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a portable scale comprises a sensor, a micro control unit, a display, a buzzer and a key unit; the key unit is used for starting and stopping the micro control unit; the micro-control unit drives the sensor; the micro control unit comprises an ADC unit, a calculating unit and a storage unit; the sensor is used for collecting a tension signal and outputting an analog electric signal to the ADC unit; the ADC unit is used for ADC sampling, converting the analog electric signal into a digital electric signal and inputting the sampled digital electric signal into the computing unit; and the calculating unit calls the calibration value and the signal sampling value in the storage unit to carry out analysis and calculation, then outputs the weight hanging value to the display to carry out weight display, and drives the buzzer.
Also includes an external memory; the output end of the computing unit is connected with the input end of the external memory; the external memory adopts an E2PROM memory. The storage unit adopts a BIE internal memory. The ADC unit adopts an ADC converter. The display adopts an LCD liquid crystal display screen. After the weighed object is hung on the portable scale, a sensor in the portable scale converts a tension signal into an electric signal, a voltage signal is converted into a digital signal by an ADC (analog to digital converter), and the weight is calculated and displayed on an LCD (liquid crystal display).
The calibration method adopts secondary calibration comprising the calibration of a preset calibration value and an actual standard weight value, and the invention adopts 5kg and 20kg standard weights for weight hanging.
As shown in fig. 2, the calibration method based on the portable scale includes the following steps: step 1, collecting a tension signal in no-load by a sensor, and outputting an electric signal to an ADC unit; step 2, the ADC unit samples signals, records the signal sampling value of the ADC unit as a no-load ADC value ADC _0 and inputs the signal sampling value into the calculation unit; step 3, the calculation unit inputs the ADC value ADC _0 into the storage unit; step 4, a preset CAL5 is arranged in the storage unit, and the calculation unit calls the preset CAL5 in the storage unit and displays the CAL5 through a display; step 5, collecting a tension signal with a hanging weight of 5kg by a sensor, and outputting an electric signal to an ADC unit; step 6, the ADC unit samples signals, the sampling time is more than or equal to 3 seconds, the signal sampling value of the ADC unit is recorded as a first calibrated ADC value ADC _5kg, and the first calibrated ADC value ADC _5kg is input into the calculation unit; when the sampling time is less than 3 seconds, returning to the step 5; step 7, inputting the first calibrated ADC value ADC _5kg into a storage unit by a calculation unit; step 8, a preset CAL20 is arranged in the storage unit, and the calculation unit calls the preset CAL20 in the storage unit and displays the CAL20 through a display; step 9, collecting a tension signal with a hanging weight of 20kg by a sensor, and outputting an electric signal to an ADC unit; step 10, the ADC unit samples signals, the sampling time is more than or equal to 3 seconds, the signal sampling value of the ADC unit is recorded as a second calibrated ADC value ADC _20kg, and the second calibrated ADC value ADC _20kg is input into the calculation unit; when the sampling time is less than 3 seconds, returning to the step 9; step 11, inputting a second calibration ADC value ADC _20kg into a storage unit by a calculation unit; and step 12, the storage unit stores the idle ADC value ADC _0, the first calibration ADC value ADC _5kg and the second calibration ADC value ADC _20 kg.
And the idle ADC value ADC _0, the first calibration ADC value ADC _5kg and the second calibration ADC value ADC _20kg are stored in a BIE internal memory or are output to an external E2PROM memory for storage through a computing unit.
As shown in fig. 3, the measuring method based on the calibration method of the portable scale includes the following steps: step 1, collecting a tension signal when a weight is hung by a sensor, and outputting an electric signal to an ADC unit; step 2, the ADC unit samples signals, the signal sampling time is more than or equal to 3 seconds, and the signal sampling value of the ADC unit is recorded as a hanging weight ADC value ADC _ v and is input into the calculation unit; step 3, when the hanging weight ADC value ADC _ V is greater than or equal to the no-load ADC value ADC _0 and the hanging weight ADC value ADC _ V is less than the first calibrated ADC value ADC _5kg, the calculation formula of the hanging weight value V is as follows:
V＝5×(adc_v-adc_0)/(adc_5kg-adc_0)
wherein ADC _ v is a weight-on ADC value; ADC _0 is the no-load ADC value; ADC _5kg is the first calibrated ADC value;
when the hanging weight ADC value ADC _ V is greater than or equal to the first calibration ADC value ADC _5kg, the calculation formula of the hanging weight value V is as follows:
V＝20×(adc_v-adc_0)/(adc_20kg-adc_0)
wherein ADC _ v is a weight-on ADC value; ADC _0 is the no-load ADC value; ADC _20kg is the second calibrated ADC value;
and 4, outputting the hanging weight value to a display by the calculating unit for weight display.
The portable scale needs to be calibrated before leaving a factory, and a measuring frame and a standard weight need to be prepared in the calibration process and operated by workers. The calibration method used by the invention adopts secondary calibration comprising preset calibration values and actual standard weight values, and the invention adopts 5kg and 20kg standard weights for weight hanging. And after the worker opens the portable scale, hanging the portable scale on the measuring frame, and then operating according to the calibration flow. And after the calibration is finished, the normal measurement mode can be entered, and the object is weighed.
The foregoing is provided to facilitate an understanding and appreciation of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (7)
1. A portable scale is characterized by comprising a sensor, a micro control unit, a display, a buzzer and a key unit; the key unit is used for starting and stopping the micro control unit; the micro control unit drives the sensor; the micro control unit comprises an ADC unit, a calculating unit and a storage unit; the sensor is used for collecting a tension signal and outputting an analog electric signal to the ADC unit; the ADC unit is used for ADC sampling, converting the analog electric signal into a digital electric signal and inputting the sampled digital electric signal into the computing unit; and the calculating unit calls the calibration value and the signal sampling value in the storage unit to carry out analysis and calculation, then outputs the weight hanging value to the display to carry out weight display, and drives the buzzer.
2. The portable scale of claim 1, further comprising an external memory; the output end of the computing unit is connected with the input end of the external memory; the external memory adopts an E2PROM memory.
3. The portable scale of claim 1, wherein the storage unit is a BIE internal memory.
4. The portable scale of claim 1, wherein the ADC unit employs an ADC converter.
5. The portable scale of claim 1, wherein the display is an LCD screen.
6. The portable scale calibration method based on claim 1 is characterized by comprising the following steps:
step 1, collecting a tension signal in no-load by a sensor, and outputting an electric signal to an ADC unit;
step 2, the ADC unit samples signals, records the signal sampling value of the ADC unit as a no-load ADC value ADC _0 and inputs the signal sampling value into the calculation unit;
step 3, the calculation unit inputs the ADC value ADC _0 into the storage unit;
step 4, a preset CAL5 is arranged in the storage unit, and the calculation unit calls the preset CAL5 in the storage unit and displays the CAL5 through a display;
step 5, collecting a tension signal with a hanging weight of 5kg by a sensor, and outputting an electric signal to an ADC unit;
step 6, the ADC unit samples signals, the sampling time is more than or equal to 3 seconds, the signal sampling value of the ADC unit is recorded as a first calibrated ADC value ADC _5kg, and the first calibrated ADC value ADC _5kg is input into the calculation unit; when the sampling time is less than 3 seconds, returning to the step 5;
step 7, inputting the first calibrated ADC value ADC _5kg into a storage unit by a calculation unit;
step 8, a preset CAL20 is arranged in the storage unit, and the calculation unit calls the preset CAL20 in the storage unit and displays the CAL20 through a display;
step 9, collecting a tension signal with a hanging weight of 20kg by a sensor, and outputting an electric signal to an ADC unit;
step 10, the ADC unit samples signals, the sampling time is more than or equal to 3 seconds, the signal sampling value of the ADC unit is recorded as a second calibrated ADC value ADC _20kg, and the second calibrated ADC value ADC _20kg is input into the calculation unit; when the sampling time is less than 3 seconds, returning to the step 9;
step 11, inputting a second calibration ADC value ADC _20kg into a storage unit by a calculation unit;
and step 12, the storage unit stores the idle ADC value ADC _0, the first calibration ADC value ADC _5kg and the second calibration ADC value ADC _20 kg.
7. The method for measuring the calibration method of the portable scale based on the claim 6 is characterized by comprising the following steps:
step 1, collecting a tension signal when a weight is hung by a sensor, and outputting an electric signal to an ADC unit;
step 2, the ADC unit samples signals, the signal sampling time is more than or equal to 3 seconds, and the signal sampling value of the ADC unit is recorded as a hanging weight ADC value ADC _ v and is input into the calculation unit;
step 3, when the hanging weight ADC value ADC _ V is greater than or equal to the no-load ADC value ADC _0 and the hanging weight ADC value ADC _ V is less than the first calibrated ADC value ADC _5kg, the calculation formula of the hanging weight value V is as follows:
V=5×(adc_v-adc_0)/(adc_5kg-adc_0)
wherein ADC _ v is a weight-on ADC value; ADC _0 is the no-load ADC value; ADC _5kg is the first calibrated ADC value;
when the hanging weight ADC value ADC _ V is greater than or equal to the first calibration ADC value ADC _5kg, the calculation formula of the hanging weight value V is as follows:
V=20×(adc_v-adc_0)/(adc_20kg-adc_0)
wherein ADC _ v is a weight-on ADC value; ADC _0 is the no-load ADC value; ADC _20kg is the second calibrated ADC value;
and 4, outputting the hanging weight value to a display by the calculating unit for weight display.
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| CN201910992038.4A CN110879097A (en) | 2019-10-18 | 2019-10-18 | Portable scale and calibration method and measurement method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112284582A (en) * | 2020-10-27 | 2021-01-29 | 南京信息工程大学滨江学院 | Sensing detection signal filtering method, pressure detection system and application |
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| CN2929673Y (en) * | 2006-06-27 | 2007-08-01 | 宁波市计量测试所 | Electronic hook scale detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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