CN114910152A - Precision correction method for weighing and metering instrument - Google Patents
Precision correction method for weighing and metering instrument Download PDFInfo
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- CN114910152A CN114910152A CN202210596923.2A CN202210596923A CN114910152A CN 114910152 A CN114910152 A CN 114910152A CN 202210596923 A CN202210596923 A CN 202210596923A CN 114910152 A CN114910152 A CN 114910152A
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- 238000005303 weighing Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000012937 correction Methods 0.000 title claims abstract description 15
- 230000000694 effects Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012271 agricultural production Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 230000002093 peripheral effect Effects 0.000 description 1
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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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/10—Calibration or testing
- H03M1/1009—Calibration
Abstract
The application provides a precision correction method of a weighing and metering instrument, wherein the weighing and metering instrument comprises a metering signal AD channel, and the method comprises the following steps: constructing a reference signal AD channel which is the same as the metering signal AD channel, and inputting a certain fixed signal in the reference signal AD channel as a calibration signal; recording a calibration AD value in the reference signal AD channel corresponding to the calibration signal during calibration, and calculating a calibration weighing data slope according to the calibration AD value; and correcting the real-time AD value in the AD channel of the metering signal at a certain temperature based on the calibration AD value and the calibration weighing data slope. The problems that the accuracy influence of the temperature sensor is changed by adopting a temperature compensation method and the compensation algorithm is complex and poor in effect are solved.
Description
Technical Field
The invention relates to the technical field of metering instruments, in particular to a precision correction method of a weighing metering instrument.
Background
The weighing instrument is also called a weighing display control instrument, is an electronic device which converts a weighing sensor signal (or a weight transmitter) into a weight digital display and can transmit, store, count and print the weight data, and is commonly used for automatic batching and weighing in industrial and agricultural production so as to improve the production efficiency.
However, the slope of an AD processing chip adopted by the existing weighing and metering instrument is influenced by temperature, so that different metering accuracies of the use environment temperature are different.
Disclosure of Invention
In view of this, the main purpose of the present invention is to solve the technical problem that the existing weighing and metering instrument is easily affected by temperature, thereby causing low metering accuracy.
The invention provides a precision correction method of a weighing and metering instrument, wherein the weighing and metering instrument comprises a metering signal AD channel, and the method comprises the following steps: constructing a reference signal AD channel which is the same as the metering signal AD channel, and inputting a certain fixed signal in the reference signal AD channel as a calibration signal; recording a calibration AD value in the reference signal AD channel corresponding to the calibration signal during calibration, and calculating a calibration weighing data slope according to the calibration AD value; and correcting the real-time AD value in the AD channel of the metering signal at a certain temperature based on the calibration AD value and the calibration weighing data slope.
Further wherein the reference signal AD channel is disposed in the weigh meter.
Further, an expression for correcting the real-time AD value in the AD channel of the measurement signal at a certain temperature based on the calibrated AD value and the calibrated weighing data slope is as follows:
wherein W is the AD value in the AD channel of the corrected metering signal, AD Real time In order to measure the real-time AD value in the signal AD channel, K is the correction slope.
Further, the expression for calculating the correction slope is as follows:
in the formula, ADref Calibration For a nominal AD value in the reference signal AD channel, ADref At present For the current AD value, k, in the reference signal AD channel Calibration To calibrate the weighing data slope.
The precision correction method of the weighing and metering instrument records the calibration AD value in the reference signal AD channel corresponding to the calibration signal during calibration, calculates the calibration weighing data slope according to the calibration AD value, corrects the real-time AD value in the metering signal AD channel at a certain temperature based on the calibration AD value and the calibration weighing data slope, and solves the problems that the precision of a temperature sensor is influenced by changing by adopting a temperature compensation method and the compensation algorithm is poor in complex effect.
Drawings
Fig. 1 is a flowchart of a method for correcting the accuracy of a weighing and metering device according to an embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, a method for correcting accuracy of a weighing and metering device according to the present application is shown, where the weighing and metering device includes a metering signal AD channel, and the method includes:
step 1, constructing a reference signal AD channel which is the same as the metering signal AD channel, and inputting a certain fixed signal into the reference signal AD channel as a calibration signal;
step 2, recording a calibration AD value in the reference signal AD channel corresponding to the calibration signal during calibration, and calculating a calibration weighing data slope according to the calibration AD value;
and 3, correcting the real-time AD value in the AD channel of the metering signal at a certain temperature based on the calibration AD value and the calibration weighing data slope.
In this embodiment, a calibration AD value in the reference signal AD channel corresponding to the calibration signal during calibration is recorded, a calibration weighing data slope is calculated according to the calibration AD value, and a real-time AD value in the metering signal AD channel at a certain temperature is corrected based on the calibration AD value and the calibration weighing data slope.
It should be noted that, the expression for correcting the real-time AD value in the AD channel of the measurement signal at a certain temperature based on the calibrated AD value and the calibrated weighing data slope is as follows:
wherein W is the AD value in the AD channel of the corrected metering signal, AD Real time In order to measure the real-time AD value in the signal AD channel, K is the correction slope.
Specifically, the expression for calculating the correction slope is as follows:
in the formula, ADref Calibration For a nominal AD value in the reference signal AD channel, ADref At present For the current AD value, k, in the reference signal AD channel Calibration To calibrate the weighing data slope.
Specifically, the calibration weighing data slope is a ratio of the calibration AD value to the calibration weight.
According to the method, the calibration AD value and the calibration weighing data slope are adopted to correct the real-time AD value in the metering signal AD channel at a certain temperature, so that the problems that the accuracy influence of a temperature sensor is changed by adopting a temperature compensation method and the compensation algorithm is complex and poor in effect are solved.
Specifically, the reference signal AD channel is arranged in the weighing and metering instrument.
In a specific embodiment, the meter using the AD conversion chip is designed with two AD channels with completely consistent specifications of circuits and components. The reference signal AD channel and the metering signal AD channel are both formed into analog signal input, amplification and conversion circuits with the same working state by adopting the same AD conversion chip, accessories such as peripheral resistors, capacitors and the like with the same specification and characteristics and the same parameters such as the same wiring. The two conversion circuits have the same temperature-dependent characteristics.
The fixed input inside the reference signal AD channel meter is 75% of a sensor full-scale signal which can be accessed by the meter. The metering instrument is mainly applied to the field of weighing, the connected signal is a resistance strain sensor, the principle of the metering instrument is that the instrument outputs voltage to the sensor, a Wheatstone bridge is arranged in the sensor, pressure is changed to cause unbalance of the Wheatstone bridge, and a corresponding differential signal is obtained. The principle is actually resistor voltage division output, and does not involve complex circuit conversion. The reference signal can realize the equivalent circuit with sensing at low cost only by building the equivalent resistance circuit of the weighing sensor;
the metering device is calibrated by a sensor 50% measuring range load at a certain temperature, the AD value of the acquired reference signal AD channel is 750000, and the AD value of the metering signal AD channel is 500000. If the load is 50.000kg, calculating the calibration slope to be 10, and recording the slope and an AD reference channel AD value;
when the metering instrument is used at another temperature, the AD value of a reference signal AD channel is collected to be 765000, the change of the ambient temperature is shown at the moment, and the temperature drift of the instrument AD is needed to be corrected;
and calculating a correction metering slope according to the AD value of the reference signal AD channel, and metering the AD value/the correction slope to obtain a correct metering indicating value.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (4)
1. A precision correction method for a weighing and metering instrument, wherein the weighing and metering instrument comprises a metering signal AD channel, and the method comprises the following steps:
constructing a reference signal AD channel which is the same as the metering signal AD channel, and inputting a certain fixed signal in the reference signal AD channel as a calibration signal;
recording a calibration AD value in the reference signal AD channel corresponding to the calibration signal during calibration, and calculating a calibration weighing data slope according to the calibration AD value;
and correcting the real-time AD value in the AD channel of the metering signal at a certain temperature based on the calibration AD value and the calibration weighing data slope.
2. The method of claim 1, wherein the reference signal AD channel is provided in the metrological instrument.
3. The method for correcting the accuracy of the weighing and metering instrument according to claim 1, wherein the expression for correcting the real-time AD value in the AD channel of the metering signal at a certain temperature based on the calibration AD value and the calibration weighing data slope is as follows:
wherein W is the AD value in the AD channel of the corrected metering signal, AD Real time In order to measure the real-time AD value in the signal AD channel, K is the correction slope.
4. The method of claim 3, wherein the calculation of the correction slope is expressed by:
in the formula, ADref Calibration For a nominal AD value in the reference signal AD channel, ADref At present Is the current AD value, k, in the reference signal AD channel Calibration To calibrate the weighing data slope.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210596923.2A CN114910152B (en) | 2022-05-30 | 2022-05-30 | Precision correction method for weighing metering instrument |
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| CN202210596923.2A CN114910152B (en) | 2022-05-30 | 2022-05-30 | Precision correction method for weighing metering instrument |
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| CN114910152A true CN114910152A (en) | 2022-08-16 |
| CN114910152B CN114910152B (en) | 2024-03-12 |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9626381D0 (en) * | 1995-12-22 | 1997-02-05 | Hermann Finance Corp Ltd | Microprocessor controlled sensor signal conditioning circuit |
| US6313414B1 (en) * | 2000-01-31 | 2001-11-06 | Harvestmaster, Inc. | Slope and motion compensator for weighing on a dynamic platform |
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| CN203132679U (en) * | 2012-11-30 | 2013-08-14 | 承德市五岳电子技术有限公司 | Weighing machine calibration-free weighing system |
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| CN106595819A (en) * | 2017-01-18 | 2017-04-26 | 郑州迪生仪器仪表有限公司 | Continuous baby weighing method of baby incubator |
| US20170257592A1 (en) * | 2016-03-02 | 2017-09-07 | Canon Kabushiki Kaisha | Signal processing apparatus and signal processing method, and image capturing apparatus |
| CN108225399A (en) * | 2017-12-13 | 2018-06-29 | 中国航天空气动力技术研究院 | A kind of general modification method of sensing system |
| CN109916496A (en) * | 2019-04-11 | 2019-06-21 | 深圳市深信信息技术有限公司 | A kind of monitoring method and system of electronic scale |
| CN112082634A (en) * | 2020-09-02 | 2020-12-15 | 谢凤兰 | Remote auxiliary calibration method for electronic scale |
| CN113393525A (en) * | 2021-08-18 | 2021-09-14 | 深圳市安普测控科技有限公司 | Weight calibration method based on accurate weighing |
| CN114499719A (en) * | 2020-11-12 | 2022-05-13 | 北京邮电大学 | Multi-radio-frequency channel mismatch calibration method and device based on channel simulator |
-
2022
- 2022-05-30 CN CN202210596923.2A patent/CN114910152B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9626381D0 (en) * | 1995-12-22 | 1997-02-05 | Hermann Finance Corp Ltd | Microprocessor controlled sensor signal conditioning circuit |
| US6313414B1 (en) * | 2000-01-31 | 2001-11-06 | Harvestmaster, Inc. | Slope and motion compensator for weighing on a dynamic platform |
| CN101943598A (en) * | 2010-07-08 | 2011-01-12 | 珠海市长陆工业自动控制系统有限公司 | Calibration-free interchange method for belt scale instruments |
| CN203132679U (en) * | 2012-11-30 | 2013-08-14 | 承德市五岳电子技术有限公司 | Weighing machine calibration-free weighing system |
| CN105794115A (en) * | 2013-10-31 | 2016-07-20 | 统雷有限公司 | Multiple channel matching method |
| US20170257592A1 (en) * | 2016-03-02 | 2017-09-07 | Canon Kabushiki Kaisha | Signal processing apparatus and signal processing method, and image capturing apparatus |
| CN106595819A (en) * | 2017-01-18 | 2017-04-26 | 郑州迪生仪器仪表有限公司 | Continuous baby weighing method of baby incubator |
| CN108225399A (en) * | 2017-12-13 | 2018-06-29 | 中国航天空气动力技术研究院 | A kind of general modification method of sensing system |
| CN109916496A (en) * | 2019-04-11 | 2019-06-21 | 深圳市深信信息技术有限公司 | A kind of monitoring method and system of electronic scale |
| CN112082634A (en) * | 2020-09-02 | 2020-12-15 | 谢凤兰 | Remote auxiliary calibration method for electronic scale |
| CN114499719A (en) * | 2020-11-12 | 2022-05-13 | 北京邮电大学 | Multi-radio-frequency channel mismatch calibration method and device based on channel simulator |
| CN113393525A (en) * | 2021-08-18 | 2021-09-14 | 深圳市安普测控科技有限公司 | Weight calibration method based on accurate weighing |
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