CN114089247A - Automatic calibrating installation of universal meter based on image recognition technology - Google Patents
Automatic calibrating installation of universal meter based on image recognition technology Download PDFInfo
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- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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Abstract
The invention relates to the technical field of automatic calibration tests of multimeters, in particular to an automatic calibration device of a multimeter based on an image recognition technology, which comprises a power supply unit, a control unit, a comprehensive standard source, a wiring terminal, an acquisition and extraction unit and a management platform, wherein the power supply unit is connected with the control unit; the power supply unit supplies power to the control unit and the comprehensive standard source; the control unit outputs a control instruction to the comprehensive standard source; and the comprehensive standard source outputs a standard numerical value after receiving the control instruction of the control unit. The invention has reasonable and compact structure and convenient use, controls the comprehensive standard source to output the standard value to the tested object through the control unit, acquires the image information of the tested object through the acquisition and extraction unit, extracts the characteristic data in the image information and outputs the characteristic data to the management platform, the management platform issues the verification report to complete the rapid verification of the tested object, the verification of a plurality of verification items of the tested object can be completed only through one-time wiring, the automation degree is high, and the verification efficiency of the tested object is improved.
Description
Technical Field
The invention relates to the technical field of automatic calibration tests of multimeters, in particular to an automatic calibration device of a multimeter based on an image recognition technology.
Background
The traceability of the instrument's measurements is through an uninterrupted comparison chain with a specified uncertainty, enabling the measurement or the value of the measurement standard to be linked to a specified reference standard. In the power industry, multimeters play an important role in daily maintenance, tests and other work of a power grid as important measurement work. In the using process of the multimeter, due to the fact that the using method is improper, aging of electrical components and the like can cause insufficient measurement precision or inaccurate measurement, and therefore the metering characteristics of the multimeter need to be verified according to regulations and specifications such as JJJG 124 verification regulations for power meters, voltage meters, power meters and resistance meters, JJF1587 calibration regulations for digital multimeters, and the like, and it is ensured that users of the multimeter can know measurement performance information of the multimeter in time. The conventional multimeter calibrating device needs continuous wiring of personnel, range adjustment, reading of data of each gear, calculation of data of each gear and measurement error in the whole calibrating process, and finally forms a calibrating certificate and other series of operations. Because the universal meter possesses measurement functions such as alternating current-direct current voltage, alternating current-direct current, resistance, possesses characteristics such as the function is many, the measuring point is many, and easily receive artificial intervention in the traditional verification process, degree of automation is low, and is inefficient.
Disclosure of Invention
The invention provides an automatic universal meter calibrating device based on an image recognition technology, overcomes the defects of the prior art, and can effectively solve the problems of low automation degree and low efficiency of the conventional automatic universal meter calibrating device which needs manual calibration.
The technical scheme of the invention is realized by the following measures: an automatic universal meter calibrating device based on an image recognition technology comprises a power supply unit, a control unit, a comprehensive standard source, a wiring terminal, an acquisition and extraction unit and a management platform;
the power supply unit supplies power to the control unit and the comprehensive standard source;
the control unit outputs a control instruction to the comprehensive standard source;
the comprehensive standard source is used for receiving a control instruction of the control unit and then outputting a standard value, wherein the standard value comprises alternating current voltage, alternating current, direct current voltage, direct current and direct current resistance;
the acquisition and extraction unit is used for acquiring image information of a tested article and extracting characteristic data of the image information, wherein the characteristic data comprises gears, display values and units;
and the management platform outputs a control command to the control unit, outputs a starting command to the acquisition and extraction unit, receives the characteristic data output by the acquisition and extraction unit and issues a verification report.
The following is further optimization or/and improvement of the technical scheme of the invention:
the management platform can comprise a verification module and an analysis module;
the verification module is used for making a verification scheme and outputting a control instruction according to the verification scheme, wherein the verification scheme comprises a plurality of verification items, and the verification items comprise alternating current verification, alternating voltage verification, direct current verification, direct voltage verification and direct current resistance verification;
and the analysis module is used for setting verification point data, and performing error analysis and precision analysis according to the acquired characteristic data and the corresponding verification point data, wherein the verification point data comprises alternating current data, alternating current voltage data, direct current voltage data and direct current resistance data.
The analysis module can complete error analysis according to the following formula;
Δ＝PX-PN
where Δ is the indication error, γ is the relative indication error, PNFor a standard value of the combined standard source output, PXAnd displaying the value of the tested object corresponding to the standard numerical value.
The collecting and extracting unit can comprise a collecting unit and an extracting unit;
the acquisition unit acquires image information of the tested object in real time;
and the extraction unit is used for extracting the characteristic data in the image information, wherein the characteristic data comprises gear positions, display values and units.
The comprehensive standard source can comprise a standard source and an amplifying circuit, and the standard source is respectively connected with the power supply unit, the control unit and the amplifying circuit.
The standard source can comprise an alternating current standard source, an alternating voltage standard source, a direct current standard source and a direct current resistance module, wherein the alternating current standard source and the direct current standard source are respectively connected with the power supply unit, the control unit and the amplifying circuit, and the alternating voltage standard source, the direct current standard source and the direct current resistance module are respectively connected with the power supply unit and the control unit.
The control unit can comprise a main control module, an input module, an output module and a communication interface, wherein the input module and the output module are connected with the main control module, and the main control module is connected with the management platform and the comprehensive standard source through the communication interface.
The invention has reasonable and compact structure and convenient use, controls the comprehensive standard source to output the standard value to the tested object through the control unit, acquires the image information of the tested object through the acquisition and extraction unit, extracts the characteristic data in the image information and outputs the characteristic data to the management platform, the management platform issues the verification report to finish the rapid verification of the tested object, the verification of a plurality of verification items of the tested object can be finished only through once wiring, the degree of automation is high, the verification process does not need to manually and frequently insert and pull lines, adjust the measuring range, read the data of each gear, calculate the data of each gear and the measurement error, and the verification efficiency of the tested object is improved.
Drawings
Fig. 1 is a schematic circuit diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic circuit diagram of an amplifier circuit in embodiment 1 of the present invention.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
The invention is further described with reference to the following examples and figures:
example 1: as shown in the attached figure 1, the automatic calibrating device of the multimeter based on the image recognition technology comprises a power supply unit, a control unit, a comprehensive standard source, a wiring terminal, an acquisition and extraction unit and a management platform;
the power supply unit supplies power to the control unit and the comprehensive standard source;
the control unit outputs a control instruction to the comprehensive standard source;
the comprehensive standard source is used for receiving a control instruction of the control unit and then outputting a standard value, wherein the standard value comprises alternating current voltage, alternating current, direct current voltage, direct current and direct current resistance;
the acquisition and extraction unit is used for acquiring image information of a tested article and extracting characteristic data of the image information, wherein the characteristic data comprises gears, display values and units;
and the management platform outputs a control command to the control unit, outputs a starting command to the acquisition and extraction unit, receives the characteristic data output by the acquisition and extraction unit and issues a verification report.
In the invention, the tested object is a universal meter, besides the universal meter, the tested object can also select a voltmeter, an ammeter, a loop resistance meter and the like; the invention can also be provided with a wiring terminal which comprises a voltage current terminal 1 and a resistance terminal 2, and the comprehensive standard source is connected with the tested object through the wiring terminal; when the detection is carried out, a tested product is connected to the voltage and current terminal 1, signals such as alternating voltage, direct voltage, alternating current and alternating voltage output by the comprehensive standard source are measured, and a measured value is displayed on a display screen of the tested product; and (3) connecting the tested sample to the resistance terminal 2, and displaying a measured value on a tested sample display screen after selecting the range of the tested sample, wherein the range of the tested sample is manually adjusted according to the output standard value of the comprehensive standard source.
The power supply unit can output 220V/380V voltage to the comprehensive standard source and provide voltage for the comprehensive standard source; the power supply unit can also output +/-3V/+/-12V voltage to the control unit to supply power to the control unit, the power of the power supply unit is not lower than 500W, and the precision is not lower than five ten-thousandths.
In the standard values output by the comprehensive standard source, the output magnitudes of the alternating voltage and the direct voltage are as follows: 30mV, 100mV, 300mV, 500mV, 1V, 3V, 5V, 10V, 30V, 100V, 300V and 1000V, and the precision is not lower than 0.01 per thousand multiplied by the measuring range; the output magnitudes of the alternating current and the direct current are: 300uA, 1mA, 3mA, 10mA, 30mA, 100mA, 1A, 3A, 10A and 30A, the precision is not lower than 0.012 thousandth multiplied by the measuring range; the resistance output magnitude is: 10 omega, 50 omega, 100 omega, 500 omega, 1k omega, 10k omega, 50k omega, 100k omega, 10M omega, 50M omega, 100M omega, 500M omega, 1000M omega, the precision is not less than 0.015 per thousand multiplied by the measuring range.
The management platform can be a computer and is used for making a verification scheme according to verification requirements, wherein the verification scheme comprises the determination of information such as completion of verification items (verification items comprise alternating current verification, alternating voltage verification, direct current verification and direct current resistance verification), verification point data (verification point data comprise alternating current data, direct current voltage data and direct current resistance data), error calculation (calculation of indication error and relative indication error according to related data), precision grade (determination according to a display value of a tested object of the related data) and the like, the management platform selects to execute the verification scheme, the standard value output by the comprehensive standard source is adjusted according to the verification requirement, and a control instruction is output to the control unit, so that the management and control of one or more control units can be realized; the management platform can also output a starting command to the acquisition and extraction unit, and provides a verification report after receiving the characteristic data output by the acquisition and extraction unit and performing calculation processing.
In conclusion, the invention has reasonable and compact structure and convenient use, the control unit controls the comprehensive standard source to output the standard value to the tested object, the acquisition and extraction unit acquires the image information of the tested object and extracts the characteristic data in the image information to output to the management platform, the management platform issues the verification report to complete the rapid verification of the tested object, the verification of a plurality of verification items of the tested object can be completed only by once wiring, the automation degree is high, the verification process does not need to manually perform frequent plugging and unplugging, adjusting the measuring range, reading the data of each gear, calculating the data of each gear and measuring errors, and the verification efficiency of the tested object is improved.
The above embodiment 1 can be further optimized or/and improved according to actual needs:
as shown in fig. 1, the management platform includes a certification module and an analysis module;
the verification module is used for making a verification scheme and outputting a control instruction according to the verification scheme, wherein the verification scheme comprises a plurality of verification items, and the verification items comprise alternating current verification, alternating voltage verification, direct current verification, direct voltage verification and direct current resistance verification;
and the analysis module is used for setting verification point data, and performing error analysis and precision analysis according to the acquired characteristic data and the corresponding verification point data, wherein the verification point data comprises alternating current data, alternating current voltage data, direct current voltage data and direct current resistance data.
The verification module selects and executes verification items in the verification scheme, adjusts the standard value output by the comprehensive standard source according to verification requirements, and outputs a control instruction to the control unit, and the verification module can realize management and control of one or more control units.
The verification point data set by the analysis module is standard data output to the tested object by the comprehensive standard source; the acquisition module determines the precision grade of the display value of the tested object by acquiring the display value of the tested object in the characteristic data extracted by the acquisition and extraction unit.
As shown in fig. 1, the analysis module performs error analysis according to the following formula;
Δ＝PX-PN
where Δ is the indication error, γ is the relative indication error, PNFor a standard value of the combined standard source output, PXAnd displaying the value of the tested object corresponding to the standard numerical value.
And calculating to obtain an indicating value error and a relative indicating value error by integrating the standard value output by the standard source and the display value of the tested object corresponding to the standard value, and completing error analysis.
As shown in fig. 1, the collecting and extracting unit comprises a collecting unit and an extracting unit;
the acquisition unit acquires image information of the tested object in real time;
and the extraction unit is used for extracting the characteristic data in the image information, wherein the characteristic data comprises gear positions, display values and units.
The acquisition unit can be a video camera, a still camera or a high-speed camera, has pixels of not less than 200 ten thousand and is used for receiving a starting command output by the control platform to acquire image information of the tested object in real time.
The extraction unit extracts the characteristic data of the image information, specifically, firstly, the image information is subjected to enhancement processing, outlines of various keys, connecting lines, displays and the like of a tested object in the image information are positioned, a high-definition image detection area image is converted into a gray image, sample matching identification is carried out on different collected parts of the tested object, a display area of the tested object is determined, binarization processing, image gradient correction and the like are carried out on the display area, extraction of the characteristic data of the display of the tested object is completed, and the characteristic data is transmitted to a management platform in a text form.
As shown in fig. 1 and 2, the integrated standard source includes a standard source and an amplifying circuit, and the standard source is respectively connected with the power supply unit, the control unit and the amplifying circuit.
The standard source is used for outputting standard values of alternating current voltage, alternating current, direct current voltage, direct current and direct current resistance according to a control instruction of the control unit.
The amplifying circuit can comprise a controllable resistor, a feedback circuit, a coil 1 and a coil 2, wherein the controllable resistor, the feedback circuit and the coil 1 are all connected with a standard source, the feedback circuit is connected with the controllable resistor and the coil 2, the standard source outputs adjustable and stable direct current, the output current is adjusted by adjusting the controllable resistor, and is I2, wherein I2 ∞ R1/(R1+ R2); the standard source outputs adjustable stable alternating current, and after the alternating current is boosted through the coil, the required test current is generated, and the output current is I2, wherein I2 is N1I 1/N2, and in general, the coil N2 is 1, namely I2 is N1I 1; the feedback circuit is used for measuring the output current, carrying out error calculation and carrying out compensation on an output line through a standard source.
The amplifying circuit can increase the current output by the standard source to 1000A equivalent current and 2000A equivalent current for output.
As shown in fig. 1, the standard source includes an ac standard source, a dc standard source, and a dc resistance module, the ac standard source and the dc standard source are respectively connected to the power supply unit, the control unit, and the amplifying circuit, and the ac standard source, the dc standard source, and the dc resistance module are respectively connected to the power supply unit and the control unit.
The alternating current standard source, the alternating voltage standard source, the direct current standard source and the direct voltage marking source can be three-phase alternating current and direct current marking sources and are used for outputting alternating current, alternating voltage, direct current and direct voltage to a tested object; the direct current resistance module is used for simulating direct current resistance and outputting a direct current resistance value to a tested product.
As shown in fig. 1, the control unit includes a main control module, an input module, an output module and a communication interface, wherein the input module and the output module are connected to the main control module, and the main control module is connected to the management platform and the comprehensive standard source through the communication interface.
In the technical scheme, the main control module can adopt a Huanshan MIC-3716 high-resolution multifunctional card and is used for outputting a control signal to the comprehensive standard source according to a control command of the management platform. The input device can be a key, a mouse, a keyboard and the like and is used for operating the main control module so that the main control module outputs a control command according to the operation instruction. The output device can be a display and is used for displaying the instructions received and output by the main control module, so that the visual check of the working personnel is facilitated. The communication interface can be interfaces of RJ45, RS232, RS485 and the like, and is used for communication between the control unit and the management platform as well as the comprehensive standard source.
Example 2: in this embodiment, an example of a verification item performed on a test object as an alternating current verification is specifically:
before verification, firstly connecting a tested object with a connecting terminal, then adjusting an alternating current standard value output by an integrated standard source by a management platform according to the alternating current verification item requirement of the tested object, and outputting a control command to enable a control unit to control the integrated standard source to output the adjusted alternating current standard value to the tested object (the alternating current standard value is verification point data of the tested object in an alternating current verification item, the alternating current standard value is preset in the management platform), meanwhile, outputting a starting command to an acquisition and extraction unit by the management platform, acquiring image information of the tested object in real time by the acquisition and extraction unit, extracting characteristic data in the image information at the moment by the acquisition and extraction unit after the acquired image information of the tested object is stable, wherein the characteristic data comprises gears, display values, units and the like, and outputting the characteristic data to the management platform in a text manner, the management platform receives the characteristic data, calculates the indicating value error and the relative indicating value error according to the related verification regulation by using the alternating current standard value and the display value of the tested object, specifically,
Δ＝PX-PN
where Δ is the indication error, γ is the relative indication error, PNStandard value of AC current output for integrated standard source, PXDisplaying a value of the tested object corresponding to the standard value of the alternating current; and finally, the management platform issues a verification report according to a verification report template, thereby completing the verification process of the alternating current verification item.
In the verification process, the acquisition and extraction unit acquires image information of the tested object in real time, the image information of the tested object to be acquired is stable, specifically, the acquisition and extraction unit acquires the image information of the tested object in real time and identifies the image information, and after a certain frame of image is identified, the measured data of the tested object is considered to be stable when the change value of the image information identified in the three times before and after the change value is zero.
The other verification items are the same as the ac verification process in this embodiment, and are not described herein again.
The technical characteristics form an embodiment of the invention, which has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (10)
1. An automatic universal meter calibrating device based on an image recognition technology is characterized by comprising a power supply unit, a control unit, a comprehensive standard source, a wiring terminal, an acquisition and extraction unit and a management platform;
the power supply unit supplies power to the control unit and the comprehensive standard source;
the control unit outputs a control instruction to the comprehensive standard source;
the comprehensive standard source is used for receiving a control instruction of the control unit and then outputting a standard value, wherein the standard value comprises alternating current voltage, alternating current, direct current voltage, direct current and direct current resistance;
the acquisition and extraction unit is used for acquiring image information of a tested article and extracting characteristic data of the image information, wherein the characteristic data comprises gears, display values and units;
and the management platform outputs a control command to the control unit, outputs a starting command to the acquisition and extraction unit, receives the characteristic data output by the acquisition and extraction unit and issues a verification report.
2. The automatic multimeter calibration device based on image recognition technology of claim 1, wherein the management platform comprises a calibration module and an analysis module;
the verification module is used for making a verification scheme and outputting a control instruction according to the verification scheme, wherein the verification scheme comprises a plurality of verification items, and the verification items comprise alternating current verification, alternating voltage verification, direct current verification, direct voltage verification and direct current resistance verification;
and the analysis module is used for setting verification point data, and performing error analysis and precision analysis according to the acquired characteristic data and the corresponding verification point data, wherein the verification point data comprises alternating current data, alternating current voltage data, direct current voltage data and direct current resistance data.
3. The automatic multimeter calibration device based on image recognition technology of claim 2, wherein the analysis module performs error analysis according to the following formula;
Δ＝PX-PN
where Δ is the indication error, γ is the relative indication error, PNFor a standard value of the combined standard source output, PXAnd displaying the value of the tested object corresponding to the standard numerical value.
4. The automatic multimeter calibration device based on the image recognition technology according to claim 1, 2 or 3, wherein the acquisition and extraction unit comprises an acquisition unit and an extraction unit;
the acquisition unit acquires image information of the tested object in real time;
and the extraction unit is used for extracting the characteristic data in the image information, wherein the characteristic data comprises gear positions, display values and units.
5. The automatic multimeter calibration device according to claim 1, 2 or 3, wherein the integrated standard source comprises a standard source and an amplifying circuit, and the standard source is respectively connected with the power supply unit, the control unit and the amplifying circuit.
6. The automatic multimeter calibration device according to claim 4, wherein the integrated standard source comprises a standard source and an amplifying circuit, and the standard source is connected to the power supply unit, the control unit and the amplifying circuit respectively.
7. The automatic multimeter calibration device according to claim 5, wherein the standard source comprises an AC standard source, a DC standard source and a DC resistance module, the AC standard source and the DC standard source are respectively connected to the power supply unit, the control unit and the amplifying circuit, and the AC standard source, the DC standard source and the DC resistance module are respectively connected to the power supply unit and the control unit.
8. The automatic multimeter calibration device according to claim 6, wherein the standard source comprises an AC standard source, a DC standard source and a DC resistance module, the AC standard source and the DC standard source are respectively connected to the power supply unit, the control unit and the amplifying circuit, and the AC standard source, the DC standard source and the DC resistance module are respectively connected to the power supply unit and the control unit.
9. The automatic multimeter calibration device based on the image recognition technology of claim 1, 2, 3, 6, 7 or 8, wherein the control unit comprises a main control module, an input module, an output module and a communication interface, the input module and the output module are both connected with the main control module, and the main control module is connected with the management platform and the comprehensive standard source through the communication interface.
10. The automatic universal meter calibrating device based on the image recognition technology as claimed in claim 5, wherein the control unit comprises a main control module, an input module, an output module and a communication interface, the input module and the output module are both connected with the main control module, and the main control module is connected with the management platform and the comprehensive standard source through the communication interface.
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