CN113820643B - Production system for calibrating multimeter and shunt and calibration method - Google Patents
Production system for calibrating multimeter and shunt and calibration method Download PDFInfo
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Abstract
A production system and a calibration method for multimeter and shunt calibration comprise a production system for multimeter calibration, a production system for shunt calibration and a server, wherein the production system for multimeter calibration determines calibration data of a multimeter to be calibrated according to calibration data of a known shunt; the production system for calibrating the current divider determines calibration data of the current divider to be calibrated according to the calibration data of the known multimeter; the server obtains calibration data of the multimeter to be calibrated and calibration data of the shunt to be calibrated, obtains a new calibration function, and stores the new calibration function into the multimeter to be calibrated. Therefore, the production calibration of the multimeter and the shunt is carried out in different production systems, the multimeter and the shunt can be separately calibrated and finally combined together, and the production efficiency of the multimeter and the shunt is greatly improved.
Description
Technical Field
The invention relates to the technical field of digital multimeters, in particular to a production system and a calibration method for calibrating a multimeter and a current divider.
Background
Digital multimeters have the function of measuring resistance, capacitance, voltage and current, and manufacturers can calibrate the digital multimeter by using a multimeter calibrator before leaving factories, so that the digital multimeter can reach certain precision. With the popularization and development of new energy automobiles, the current required to be measured is larger and larger, and the traditional digital multimeter cannot meet the measurement requirement. The sampling resistor and the fuse, which measure the current, are separated as a separate component (shunt). Therefore, the current measuring requirement of the new energy automobile can be met by the digital multimeter only by selecting the current divider with a proper measuring range. However, since the digital multimeter and the shunt must be bound together for calibration to achieve a certain precision, the digital multimeter and the shunt must be bound for production during production, which affects production efficiency, especially for shunts with a plurality of different ranges, and affects production efficiency seriously.
Disclosure of Invention
The invention mainly solves the technical problem of how to improve the production efficiency of the multimeter and the shunt.
According to a first aspect, an embodiment provides a production system for multimeter calibration comprising:
a current source for outputting an analog current signal;
the current divider is used for converting the analog current signal output by the current source into an analog voltage signal and outputting the analog voltage signal; wherein the splitter is a splitter for known calibration data;
the universal meter is used for converting the analog voltage signal output by the current divider into a digital voltage signal, processing the digital voltage signal and displaying the current value of the analog current signal; the universal meter is a universal meter to be calibrated;
the server is in signal connection with the current source, the current divider and the universal meter and is used for storing calibration data of the current divider; the voltage value of the analog voltage signal output by the current divider is acquired; determining calibration data of the multimeter according to the calibration data of the current divider and the voltage value of the analog voltage signal; and sending the calibration data of the multimeter to the multimeter for storage.
In one embodiment, determining calibration data for the multimeter based on the calibration data for the current splitter and the voltage value of the analog voltage signal comprises:
acquiring a current value of an analog current signal output by the current source;
and determining calibration data of the multimeter according to the current value of the analog current signal, the voltage value of the analog voltage signal and the calibration data of the current divider.
In one embodiment, the current source outputs analog current signals as two sets of analog current signals with different current values, and the current divider outputs analog voltage signals as two sets of analog voltage signals with different voltage values.
In one embodiment, the determining calibration data of the multimeter from the current value of the analog current signal, the voltage value of the analog voltage signal, and the calibration data of the current divider comprises:
the calibration data for the multimeter was calculated according to the following equation:
I=(1/（G*R）)* Vadc+b
the universal meter comprises a current source, a voltage divider, a voltage amplifier circuit, an analog-to-digital converter, a current source, a voltage divider, a voltage-to-digital converter, a universal meter and an operational amplifier circuit, wherein I is the current value of the current source for outputting an analog current signal, Vadc is the voltage value of input analog voltage of the analog-to-digital converter in the universal meter, R is calibration data of the current divider, R is equivalent sampling resistance of the current divider, G and b are calibration data of the universal meter, G is internal gain of the universal meter, and b is bias current and voltage of the operational amplifier circuit inside the universal meter.
According to a second aspect, an embodiment provides a production system for shunt calibration, comprising:
a current source for outputting an analog current signal;
the current divider is used for converting the analog current signal output by the current source into an analog voltage signal and outputting the analog voltage signal; the shell of the diverter is provided with a bar code, and the bar code is used for identifying the diverter; the shunt is a shunt to be calibrated;
the universal meter is used for converting the analog voltage signal output by the current divider into a digital voltage signal, processing the digital voltage signal and displaying the current value of the analog current signal; wherein the multimeter is a multimeter with known calibration data;
the server is in signal connection with the current source, the current divider and the multimeter and is used for storing calibration data of the multimeter; the voltage value of the analog voltage signal output by the current divider is acquired; determining calibration data of the current divider according to the calibration data of the multimeter and the voltage value of the analog voltage signal; associating the calibration data of the diverter with a corresponding bar code and saving the bar code of the diverter and the calibration data of the diverter.
In one embodiment, determining calibration data for the current splitter from calibration data for the multimeter and a voltage value of the analog voltage signal comprises:
acquiring a current value of an analog current signal output by the current source;
and determining calibration data of the current divider according to the current value of the analog current signal, the voltage value of the analog voltage signal and the calibration data of the multimeter.
In one embodiment, the determining calibration data of the current divider according to the current value of the analog current signal, the voltage value of the analog voltage signal and calibration data of the multimeter comprises:
the calibration data for the multimeter was calculated according to the following equation:
I=(1/（G*R）)* Vadc+b
the universal meter comprises a current source, a voltage divider, a voltage amplifier circuit, an analog-to-digital converter, a current source, a voltage divider, a voltage-to-digital converter, a universal meter and an operational amplifier circuit, wherein I is the current value of the current source for outputting an analog current signal, Vadc is the voltage value of input analog voltage of the analog-to-digital converter in the universal meter, R is calibration data of the current divider, R is equivalent sampling resistance of the current divider, G and b are calibration data of the universal meter, G is internal gain of the universal meter, and b is bias current and voltage of the operational amplifier circuit inside the universal meter.
According to a third aspect, there is provided in an embodiment a production system for multimeter and shunt calibration comprising:
the production system for multimeter calibration according to the embodiment is used for determining calibration data of a multimeter to be calibrated according to calibration data of a known current divider and storing the calibration data into the multimeter to be calibrated;
the production system for calibrating the current divider, which is described in the embodiment, is used for determining the calibration data of the current divider to be calibrated according to the calibration data of the known multimeter; uploading the bar code of the shunt to be calibrated and the calibration data of the shunt to be calibrated to a server;
the server is used for acquiring calibration data of the multimeter to be calibrated and calibration data of the shunt to be calibrated, forming a new calibration function, and storing the new calibration function into the multimeter to be calibrated; and the new calibration function is used for calibrating the system consisting of the shunt to be calibrated and the multimeter to be calibrated.
According to a fourth aspect, there is provided in one embodiment a calibration method for a multimeter and a shunt, comprising:
in a production system for calibrating the multimeter, according to calibration data of a known current divider, determining calibration data of the multimeter to be calibrated, and storing the calibration data into the multimeter to be calibrated;
in a production system for calibrating the current divider, determining calibration data of the current divider to be calibrated according to calibration data of a known multimeter; uploading the bar code of the shunt to be calibrated and the calibration data of the shunt to be calibrated to a server;
the server acquires calibration data of the multimeter to be calibrated and calibration data of the shunt to be calibrated to form a new calibration function, and the new calibration function is stored in the multimeter to be calibrated; and the new calibration function is used for calibrating the system consisting of the shunt to be calibrated and the multimeter to be calibrated.
The production system for multimeter and shunt calibration according to the above embodiment comprises a production system for multimeter calibration, a production system for shunt calibration and a server, wherein the production system for multimeter calibration determines calibration data of a multimeter to be calibrated according to calibration data of a known shunt; the production system for calibrating the current divider determines calibration data of the current divider to be calibrated according to the calibration data of the known multimeter; the server obtains calibration data of the multimeter to be calibrated and calibration data of the shunt to be calibrated, obtains a new calibration function, and stores the new calibration function into the multimeter to be calibrated. Therefore, the production calibration of the multimeter and the shunt is carried out in different production systems, the multimeter and the shunt can be separately calibrated and finally combined together, and the production efficiency of the multimeter and the shunt is greatly improved.
Drawings
FIG. 1 is a schematic circuit diagram of a multimeter current measurement according to an embodiment;
FIG. 2 is a schematic circuit diagram of another embodiment of a multimeter for measuring current;
FIG. 3 is a schematic diagram of a production system for multimeter calibration according to an embodiment;
FIG. 4 is a schematic diagram of a production system for shunt calibration according to one embodiment;
FIG. 5 is a schematic diagram of a production system for multimeter and shunt calibration according to one embodiment;
FIG. 6 is a schematic diagram of calibration of a multimeter and shunt according to one embodiment;
FIG. 7 is a flow chart of a calibration method for a multimeter and a shunt according to one embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous specific details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in this specification in order not to obscure the core of the present application with unnecessary detail, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The ordinal numbers used herein for the components, such as "first," "second," etc., are used merely to distinguish between the objects described, and do not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Referring to FIG. 1, FIG. 1 is a schematic diagram of a multimeter current measurement circuit according to an embodiment, wherein a current I to be measured flows in from an input terminal + and flows out from the input terminal, and a voltage signal V is formed between a fuse and a sampling resistor R according to ohm's lawABThen, the analog voltage signal Vadc is output to the input end of an analog-to-digital converter (ADC) after passing through the conditioning circuit, the ADC converts the analog voltage signal Vadc into a digital voltage signal, and the digital voltage signal is processed by a processor to display the measured current value. Ideally, I = (1/(G × R)) × Vadc, G is the gain of the conditioning circuit, and after G and R are determined, the measured current value I can be calculated. However, because the sampling resistor R has an error in precision and the resistance of the sampling resistor R is very small, generally at the milliohm level, the fuse equivalent resistor Rf, the PCB trace equivalent resistor Rpcb, the connector equivalent resistor Rcon, etc. need to be considered, and the gain G of the conditioning circuit also has an error, so the multimeter needs to be calibrated. One calibration scheme is to input a plurality of high-precision currents of different current values to the multimeter, calculate a function of I = f (vadc), and store the function in a nonvolatile memory (flash) of the multimeter.
Referring to FIG. 2, FIG. 2 is a schematic diagram of another embodiment of a multimeter having a current divider separated from a fuse and a sampling resistor R, wherein the current divider is formed by a fuse and a sampling resistor R, and the multimeter is formed by a conditioning circuit, an analog-to-digital converter (ADC) and a processor. In this case, the shunt is used as an accessory of a multimeter.
In the embodiment of the invention, the current divider and the universal meter are respectively calibrated through different production systems, the calibration data of the current divider and the universal meter are respectively stored, and before the current divider and the universal meter are combined, the calibration data of the current divider and the universal meter are combined to obtain the combined calibration function of universal meter equipment, so that the universal meter equipment can be conveniently calibrated by adopting a universal meter calibrator in the subsequent process.
It should be noted that the multimeter provided by the embodiment of the present invention is the multimeter device shown in fig. 2 with the shunt separated, wherein the shunt (fuse, sampling resistor R) and the multimeter (conditioning circuit, ADC, and processor) form the multimeter device.
The first embodiment is as follows:
first, a production system for calibrating a multimeter alone will be described.
Referring to FIG. 3, FIG. 3 is a schematic diagram of a production system for multimeter calibration according to an embodiment, the production system for multimeter calibration comprising: current source 11, current divider 12, multimeter 13, and server 14. Wherein, current divider 12 is a current divider with known calibration data, and multimeter 13 is a multimeter to be calibrated.
The current source 11 is used for outputting an analog current signal to the shunt 12. In the present embodiment, the analog current signal output by the current source 11 is two sets of analog current signals with different current values, and the two sets of analog current signals can be sequentially output to the shunt 12.
The current divider 12 is configured to sequentially convert two sets of analog current signals with different current values output by the current source 11 into analog voltage signals according to an input sequence of the analog current signals, and sequentially output the analog voltage signals to the multimeter 13.
The universal meter 13 is used for sequentially converting the two groups of analog voltage signals output by the current divider 12 into digital voltage signals, and sequentially displaying the current values of the two groups of analog current signals after processing the digital voltage signals; wherein, the universal meter is the universal meter that waits to calibrate.
The server 14 is in signal connection with the current source 11, the current divider 12 and the multimeter 13, and the server 14 is used for storing calibration data of the current divider 12; and is also used for obtaining the voltage value of the analog voltage signal output by the current divider 12; according to the calibration data of the current divider 12 and the voltage value of the analog voltage signal, determining calibration data of the multimeter; and sending the calibration data of the multimeter to a nonvolatile memory (flash) of the multimeter for storage. In this embodiment, the signal connections of the server 14 to the current source 11, the current divider 12 and the multimeter 13 are realized by a computer 16 for the production system.
In one embodiment, server 14 determines calibration data for multimeter 13 based on the calibration data for shunt 12 and the voltage value of the analog voltage signal, including:
acquiring the current value of the current source 11 outputting the analog current signal; calibration data for multimeter 13 is determined based on the current value of the analog current signal, the voltage value of the analog voltage signal, and the calibration data for shunt 12.
Because the analog current signals output by the current source 11 are two groups, the calibration data of the multimeter can be calculated according to the equations (1) and (2).
I1=(1/（G*R）)* Vadc1+b (1)
I2=(1/（G*R）)* Vadc2+b (2)
Wherein I1 is a current value of one set of analog current signals output by the current source 11, I2 is a current value of another set of analog current signals output by the current source 11, Vadc1 is a voltage value of an input analog voltage signal of an analog-to-digital converter in one set of multimeter, Vadc2 is a voltage value of an input analog voltage signal of an analog-to-digital converter in another set of multimeter, R is an equivalent sampling resistance of the shunt 12, and since a calibration function of the shunt 12 is f (div) = (R), R is calibration data of the shunt 12, which is a known quantity.
In summary, the values of G and b can be calculated according to equations (1) and (2), where G and b are parameters related to multimeter 13, and the calibration function of multimeter 13 is f (dmm) = (G, b), so that G and b are calibration data of the multimeter.
Since the splitter 12 has no memory, calibration data of the splitter 12 needs to be uploaded to a server for storage, and in order to identify calibration data of different splitters, the calibration data needs to be associated with barcodes of the splitters one by one, so that the barcodes on the splitter 12 can be scanned by a barcode scanner 15 in signal connection with the server 14 to obtain the calibration data.
Example two:
next, a production system for individually calibrating the shunt will be described.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a production system for shunt calibration according to an embodiment, the production system for shunt calibration includes: current source 21, current divider 22, multimeter 23, and server 24. Therein, multimeter 23 is a multimeter for which calibration data is known, and shunt 22 is the shunt to be calibrated.
The current source 21 is used to output an analog current signal to the shunt 22. In the present embodiment, the analog current signal output by the current source 21 is a set of analog current signals with known current values.
The current divider 22 is used for converting the analog current signal output by the current source 21 into an analog voltage signal according to the analog current signal, and outputting the analog voltage signal to the multimeter 23. The shell of the diverter 22 is provided with a bar code and a measuring range, the bar code corresponds to the diverter one by one, and the bar code is used for identifying the corresponding diverter.
The multimeter 23 is configured to convert the analog voltage signal output by the current divider 22 into a digital voltage signal, process the digital voltage signal, and display a current value of the analog current signal.
The server 24 is in signal connection with the current source 21, the current divider 22 and the multimeter 23, and the server 24 is used for storing calibration data of the current divider 22; and is also used for obtaining the voltage value of the analog voltage signal output by the current divider 22; determining calibration data of the current divider 22 according to the calibration data of the multimeter 23 and the voltage value of the analog voltage signal; the calibration data for the diverter 22 is associated with the corresponding bar code and the bar code for the diverter 22 and the calibration data for the diverter are saved. In the present embodiment, the signal connection of the server 24 to the current source 21, the current divider 22, and the multimeter 23 is realized by a computer 26 for the production system.
In one embodiment, server 24 determines calibration data for splitter 22 based on the calibration data for multimeter 23 and the voltage value of the analog voltage signal, including:
acquiring the current value of the current source 21 outputting the analog current signal; calibration data for the shunt 22 is determined from the current value of the analog current signal, the voltage value of the analog voltage signal, and calibration data for the multimeter 23.
Multimeter calibration data was calculated according to equation (3).
I3=(1/（G*R）)* Vadc3+b (3)
Where I3 is the current value of the analog current signal output by the current source 21, Vadc3 is the voltage value of the input analog voltage signal of the analog-to-digital converter in the multimeter, G and b are relevant parameters of the multimeter 23, and the calibration function of the multimeter 23 is f (dmm) = (G, b), so G and b are calibration data of the multimeter, which are known quantities.
In summary, the value of R can be calculated according to equation (3), where R is the equivalent sampling resistance of the shunt 22, and since the calibration function of the shunt 22 is f (div) = (R), R is the calibration data of the shunt 22.
Since the splitter 22 has no memory, the calibration data of the splitter 22 needs to be uploaded to the server for storage, and in order to identify the calibration data of different splitters, the calibration data needs to be associated with the bar codes of the splitters one by one, so that the bar codes on the splitter 22 can be scanned by the bar code 25 in signal connection with the server 24 to obtain the calibration data.
Example three:
referring to FIG. 5, FIG. 5 is a schematic diagram of a production system for multimeter and shunt calibration according to an embodiment, the production system for multimeter and shunt calibration being a production system for multimeter device calibration resulting from a final combination of multimeters and shunts. The production system includes: the production system 31 for multimeter calibration provided in the first embodiment, the production system 32 for shunt calibration provided in the second embodiment, and the server 33.
The production system 31 for multimeter calibration determines calibration data of the multimeter to be calibrated according to calibration data of the known current divider, and stores the calibration data into the multimeter to be calibrated.
The production system 32 for shunt calibration determines calibration data for the shunt to be calibrated from calibration data for a known multimeter; the bar code of the splitter to be calibrated and the calibration data of the splitter to be calibrated are uploaded to the server 33.
Since the detailed description of the embodiments of the production system 31 for multimeter calibration and the production system 32 for shunt calibration are described in detail in examples one and two, no further description is provided herein.
The server 33 acquires calibration data of the multimeter to be calibrated and calibration data of the shunt to be calibrated to form a new calibration function, and the new calibration function is stored in the multimeter to be calibrated; the new calibration function is used for calibrating the multimeter device formed by the current divider to be calibrated and the multimeter to be calibrated.
It should be noted that the server 14, the server 24, and the server 33 may be one server, or may be three different servers with which signals can interact.
Referring to fig. 6, when leaving the factory, a multimeter 34 to be calibrated and a shunt 35 to be calibrated may be randomly calibrated by the server 33 before being assembled and packaged, specifically: the server 33 can directly acquire calibration data G and b of the multimeter 34 to be calibrated, and the server 33 can acquire calibration data R of the shunt 35 to be calibrated by scanning a bar code on the shunt 35 to be calibrated through the code scanner 36, wherein the server 33 is in communication connection with the code scanner 36 and the multimeter 34 to be calibrated through the computer 37 for assembling and packaging, so that a new calibration function I = (1/(G × R)) = Vadc + b is formed according to G, b and R, and the new calibration function is saved in a nonvolatile memory (flash) of the multimeter to be calibrated as a calibration function of the newly formed multimeter device because the shunt has no memory function. Finally, the user calibrates the newly formed multimeter device according to the calibration function by using the existing multimeter calibrator.
Referring to fig. 7, in the production system for multimeter and shunt calibration described above, fig. 7 is a flowchart of a calibration method for multimeter and shunt according to an embodiment, including the following steps:
step 100: in a production system for multimeter calibration, calibration data for a multimeter to be calibrated is determined from calibration data for a known shunt, and the calibration data is saved to the multimeter to be calibrated.
Step 200: in a production system for calibrating the current divider, determining calibration data of the current divider to be calibrated according to calibration data of a known multimeter; and uploading the bar code of the shunt to be calibrated and the calibration data of the shunt to be calibrated to a server.
Step 300: the method comprises the steps that a server obtains calibration data of the multimeter to be calibrated and calibration data of a current divider to be calibrated to form a new calibration function, and the new calibration function is stored in the multimeter to be calibrated; the new calibration function is used for calibrating a system consisting of the shunt to be calibrated and the multimeter to be calibrated.
The calibration method corresponds to the above production system, and is not described in detail herein.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (3)
1. A production system for multimeter and shunt calibration comprising:
the production system for calibrating the multimeter is used for determining calibration data of the multimeter to be calibrated according to the calibration data of the calibrated shunt and storing the calibration data into the multimeter to be calibrated;
the production system is used for calibrating the current divider and is used for determining calibration data of the current divider to be calibrated according to the calibration data of the calibrated multimeter; uploading the bar code of the shunt to be calibrated and the calibration data of the shunt to be calibrated to a server;
the server is used for acquiring calibration data of the multimeter to be calibrated and calibration data of the shunt to be calibrated to form a new calibration function, and storing the new calibration function into the multimeter to be calibrated; the new calibration function is used for calibrating a multimeter system consisting of the shunt to be calibrated and the multimeter to be calibrated;
the current divider to be calibrated and the current divider calibrated both consist of a fuse and a sampling resistor, and the multimeter to be calibrated and the multimeter calibrated both consist of a conditioning circuit, an analog-to-digital converter and a processor;
the production system for multimeter calibration comprises:
a first current source for outputting a first analog current signal;
a calibrated current divider for converting a first analog current signal output by the first current source into a first analog voltage signal and outputting the first analog voltage signal; wherein the calibrated splitter is a splitter for known calibration data;
the multimeter to be calibrated is used for converting the first analog voltage signal output by the calibrated shunt into a first digital voltage signal, and displaying the current value of the first analog current signal after processing the first digital voltage signal;
the server is in signal connection with the first current source, the calibrated current divider and the multimeter to be calibrated, and the server is used for storing calibration data of the calibrated current divider; the current value acquisition module is also used for acquiring the voltage value of a first analog voltage signal output by the calibrated current divider and the current value of the first analog current signal; determining calibration data of the multimeter to be calibrated according to the calibration data of the calibrated current divider, the current value of the first analog current signal and the voltage value of the first analog voltage signal; sending the calibration data of the multimeter to be calibrated to the multimeter to be calibrated for storage;
the production system for shunt calibration includes:
a second current source for outputting a second analog current signal;
the current divider to be calibrated is used for converting a second analog current signal output by the second current source into a second analog voltage signal and outputting the second analog voltage signal; the shell of the shunt to be calibrated is provided with a bar code, and the bar code is used for identifying the shunt to be calibrated;
the calibrated multimeter is used for converting a second analog voltage signal output by the current divider to be calibrated into a second digital voltage signal, and displaying the current value of the second analog current signal after processing the second digital voltage signal; wherein the calibrated multimeter is a multimeter with known calibration data;
the server is in signal connection with the second current source, the current divider to be calibrated and the calibrated multimeter, and the server is used for storing calibration data of the calibrated multimeter; the voltage value of the second analog voltage signal output by the current divider to be calibrated is also obtained; determining calibration data of the current divider to be calibrated according to the calibration data of the calibrated multimeter, the current value of the second analog current signal and the voltage value of the second analog voltage signal; associating the calibration data of the shunt to be calibrated with the corresponding bar code, and storing the bar code of the shunt to be calibrated and the calibration data of the shunt to be calibrated;
the method for determining the calibration data of the multimeter to be calibrated according to the calibration data of the calibrated current divider, the current value of the first analog current signal and the voltage value of the first analog voltage signal comprises the following steps:
calculating the calibration data of the multimeter to be calibrated according to the following formula:
I1=(1/（G1*R1）)* Vadc1+b1
wherein, I1Is the current value of the first analog current signal, Vadc1For the voltage value, R, of the input analog voltage of an analog-to-digital converter in a multimeter to be calibrated1Calibration data for a calibrated shunt, wherein R1Is the resistance of the sampling resistor of the calibrated shunt, G1And b1Calibration data for the multimeter to be calibrated, where G1For the internal gain of the multimeter to be calibrated, b1The bias current of a conditioning circuit in the multimeter to be calibrated is obtained;
determining calibration data of the current divider to be calibrated according to the calibration data of the calibrated multimeter, the current value of the second analog current signal and the voltage value of the second analog voltage signal, wherein the determining calibration data comprises:
calculating calibration data of the shunt to be calibrated according to the following formula:
I2=(1/（G2*R2）)* Vadc2+b2
wherein, I2Is the current value of the second analog current signal, Vadc2Is the voltage value, R, of the input analog voltage of an analog-to-digital converter in a calibrated multimeter2Calibration data for the shunt to be calibrated, where R2For the equivalent sampling resistance, G, of the shunt to be calibrated2And b2Calibration data for a calibrated multimeter wherein G2For internal gain of calibrated multimeter, b2Is the bias current of the conditioning circuitry inside the calibrated multimeter.
2. The production system for multimeter and shunt calibration of claim 1, wherein the first current source outputs the first analog current signals as two sets of analog current signals having different current values, and the calibrated shunt outputs the first analog voltage signals as two sets of analog voltage signals having different voltage values.
3. A calibration method for a multimeter and shunt, comprising:
in a production system for calibrating the multimeter, according to calibration data of a calibrated shunt, determining calibration data of the multimeter to be calibrated, and storing the calibration data into the multimeter to be calibrated;
in a production system for calibrating the current divider, determining calibration data of the current divider to be calibrated according to the calibration data of the calibrated multimeter; uploading the bar code of the shunt to be calibrated and the calibration data of the shunt to be calibrated to a server;
the server acquires calibration data of the multimeter to be calibrated and calibration data of the shunt to be calibrated to form a new calibration function, and the new calibration function is stored in the multimeter to be calibrated; the new calibration function is used for calibrating a multimeter system consisting of the shunt to be calibrated and the multimeter to be calibrated;
the universal meter to be calibrated and the universal meter to be calibrated respectively comprise a conditioning circuit, an analog-to-digital converter and a processor;
the production system for multimeter calibration comprises:
a first current source for outputting a first analog current signal;
a calibrated current divider for converting a first analog current signal output by the first current source into a first analog voltage signal and outputting the first analog voltage signal; wherein the calibrated splitter is a splitter for known calibration data;
the multimeter to be calibrated is used for converting the first analog voltage signal output by the calibrated shunt into a first digital voltage signal, and displaying the current value of the first analog current signal after processing the first digital voltage signal;
the server is in signal connection with the first current source, the calibrated current divider and the multimeter to be calibrated, and the server is used for storing calibration data of the calibrated current divider; the current value acquisition module is also used for acquiring the voltage value of a first analog voltage signal output by the calibrated current divider and the current value of the first analog current signal; determining calibration data of the multimeter to be calibrated according to the calibration data of the calibrated current divider, the current value of the first analog current signal and the voltage value of the first analog voltage signal; sending the calibration data of the multimeter to be calibrated to the multimeter to be calibrated for storage;
the production system for shunt calibration includes:
a second current source for outputting a second analog current signal;
the current divider to be calibrated is used for converting a second analog current signal output by the second current source into a second analog voltage signal and outputting the second analog voltage signal; the shell of the shunt to be calibrated is provided with a bar code, and the bar code is used for identifying the shunt to be calibrated;
the calibrated multimeter is used for converting a second analog voltage signal output by the current divider to be calibrated into a second digital voltage signal, and displaying the current value of the second analog current signal after processing the second digital voltage signal; wherein the calibrated multimeter is a multimeter with known calibration data;
the server is in signal connection with the second current source, the current divider to be calibrated and the calibrated multimeter, and the server is used for storing calibration data of the calibrated multimeter; the current value acquisition module is also used for acquiring the voltage value of a second analog voltage signal and the current value of the second analog current signal output by the current divider to be calibrated; determining calibration data of the current divider to be calibrated according to the calibration data of the calibrated multimeter, the current value of the second analog current signal and the voltage value of the second analog voltage signal; associating the calibration data of the shunt to be calibrated with the corresponding bar code, and storing the bar code of the shunt to be calibrated and the calibration data of the shunt to be calibrated;
the step of determining calibration data of the multimeter to be calibrated according to the current value of the analog current signal, the voltage value of the analog voltage signal and the calibration data of the current divider to be calibrated includes:
calculating the calibration data of the multimeter to be calibrated according to the following formula:
I1=(1/（G1*R1）)* Vadc1+b1
wherein, I1Is the current value of the first analog current signal, Vadc1For the voltage value, R, of the input analog voltage of an analog-to-digital converter in a multimeter to be calibrated1Calibration data for a calibrated shunt, wherein R1Is the resistance of the sampling resistor of the calibrated shunt, G1And b1Calibration data for the multimeter to be calibrated, where G1For the internal gain of the multimeter to be calibrated, b1The method comprises the steps of obtaining bias current of a conditioning circuit in the multimeter to be calibrated;
determining calibration data of the current divider to be calibrated according to the calibration data of the calibrated multimeter, the current value of the second analog current signal and the voltage value of the second analog voltage signal, wherein the determining calibration data comprises:
calculating calibration data of the shunt to be calibrated according to the following formula:
I2=(1/（G2*R2）)* Vadc2+b2
wherein, I2Is the current value of the second analog current signal, Vadc2For the voltage value of the input analog voltage, R, of an analog-to-digital converter in a calibrated multimeter2Calibration data for the shunt to be calibrated, where R2For the equivalent sampling resistance, G, of the shunt to be calibrated2And b2Calibration data for a calibrated multimeter, wherein G2For internal gain of a calibrated multimeter, b2Is the bias current of the conditioning circuitry inside the calibrated multimeter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2502277Y (en) * | 2001-04-10 | 2002-07-24 | 郑华 | Intelligent digital multimeter |
| TWI305841B (en) * | 2006-10-11 | 2009-02-01 | Hon Hai Prec Ind Co Ltd | System and method for measuring digital multimeters automatically |
| DE102011078334A1 (en) * | 2011-06-29 | 2013-01-03 | Robert Bosch Gmbh | Method and system for calibrating a shunt resistor |
| CN202196158U (en) * | 2011-08-24 | 2012-04-18 | 杭州三海电子有限公司 | Battery voltage and current calibration system |
| US9234943B2 (en) * | 2011-12-16 | 2016-01-12 | Lear Corporation | Method and system for battery current measurement calibration |
| CN107728094B (en) * | 2017-10-23 | 2020-09-29 | 宁德时代新能源科技股份有限公司 | Current calibration coefficient measuring device and method, and current detecting device and method |
| CN207817038U (en) * | 2018-01-22 | 2018-09-04 | 深圳市鼎阳科技有限公司 | A kind of current measurement circuit and multimeter |
| US11249164B2 (en) * | 2019-04-25 | 2022-02-15 | Honeywell International Inc. | Methods, apparatuses, systems, and computer program products for multi-point shunt calibration |
| CN110471023B (en) * | 2019-08-02 | 2025-01-07 | 珠海科盈自动化系统有限公司 | A DC instrument testing tool and method |
| CN110736949B (en) * | 2019-10-16 | 2022-08-02 | 桂林市华谊智测科技有限责任公司 | Digital multimeter calibration method and related device |
| CN211979181U (en) * | 2019-10-16 | 2020-11-20 | 桂林市华谊智测科技有限责任公司 | Calibration device of universal meter |
| CN112731247B (en) * | 2020-12-29 | 2024-03-19 | 欣旺达动力科技股份有限公司 | Calibration system, calibration method, and storage medium |
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