CN115166568A - Remote magnitude transmission and tracing system and method for direct-current voltage source - Google Patents
Remote magnitude transmission and tracing system and method for direct-current voltage source Download PDFInfo
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Abstract
The invention provides a system and a method for transmitting and tracing a remote magnitude value of a direct-current voltage source. The invention adopts a mobile communication (communication module) mode to realize remote quantity value transmission and tracing, so that the acquisition of a calibrated voltage source is not limited by a place environment any more, calibration is carried out on multiple paths of calibrated voltage sources on site, measurement parameters with time information are returned on site and correspond to laboratory measurement parameters, and real-time calibration is realized, thereby leading-in errors caused by time asynchronism can be eliminated. Therefore, the situation that the calibrated voltage source is separated from the working environment is avoided, and the calibration activity can be realized in the original working environment of the calibrated voltage source. The remote voltage source calibration system which is not easily influenced by environment and distance realizes high-efficiency, multi-site and multi-path voltage value remote calibration, and meets the requirements of the calibration system on quickness, accuracy, precision and the like.
Description
Technical Field
The invention relates to the field of electrical metering calibration, in particular to a system and a method for remote magnitude transmission and traceability of a direct-current voltage source.
Background
In this society, where high-quality production replaces high-speed production, the accuracy of instruments and meters has a significant impact on the sale and use of products. The metering calibration activity is a necessary measure for ensuring the accuracy and reliability of the measured values of the instruments. Currently, the techniques used in the field of calibration of metrology instruments are all conventional off-line techniques, including methods of delivering standard meters and standard metrology tools to the field.
Transfer standard instrumentation: the standard instrument is transferred from the laboratory to the field, and the most important step in the whole calibration process in the field is the tracing of the standard table, so that higher accuracy level of the standard table is ensured. However, in the process of transferring the standard table to the field, the accuracy of the standard table is difficult to maintain, additional errors are generated in the transferring process, the reasons of the errors are unknown, the sizes of the errors are unknown, and the errors in the transferring process cannot be eliminated theoretically. The process of transferring the standard instrument is complex and tedious, and the higher accuracy grade of the standard instrument cannot be ensured, so that the error which cannot be eliminated is brought to field verification.
Standard metering apparatus was placed on site: the standard metrology tool is placed at the calibration site, the metrology calibration activities are performed on site, and the data is brought back to the standard laboratory for processing. In the mode, the standard measuring instrument is placed on the site, and the standard measuring instrument needs to be periodically brought back to a standard laboratory for calibration of the standard measuring instrument, so that the accuracy and reliability of the on-site measuring calibration activity are ensured. However, this model has a long period of time in magnitude transmission and tracing, and is costly, labor and material consuming, and still involves a lot of additional errors in the process of transferring the standard instrument back to the laboratory.
In the research for remote calibration at home and abroad, roccotelli and the like research a dynamic weighing system based on the technology of the Internet of things, and Zhang Jun discusses a remote calibration method based on the Internet and performs network simulation. The component type remote calibration system which is easy to expand and high in applicability is constructed by the space design. Yulang et al analyzed a remote bus calibration system based on ActiveX technology. Guo Jingtao et al designed an internet-based universal remote calibration platform. Zhangpeng et al describe the research and development of a remote metering system using cloud services. Gurley proposes a network measurement and control system capable of realizing calibration of a standard instrument for on-site video monitoring, and the system does not propose calibration details and only explains the monitoring system. The calibration of the digital multimeter is indicated in LabVIEW-based remote calibration system research proposed by the university of defense science and technology, but the key point of the full text is the compiling and the function of an upper computer, and a detected table and a standard source are both in the same environment and are not really far-transmitted.
The calibration work of the standard voltage source is always a relatively complicated process, mainly because of the variability and complexity of the standard meter in the transportation process, the on-site calibration is carried out by transmitting the standard meter, the influence of factors such as environment and the like on the standard instrument in the transmission process cannot be ensured, a large amount of additional errors are introduced, and a large amount of human resources and material resources are consumed in the transportation process of the standard meter. Although some studies have been made by scholars on remote calibration, "real" remote calibration for voltage sources is still in the blank area. Compared with the prior art and the prior art, the remote real-time calibration is not achieved, the whole calibration process is more complicated, and the precision is lower.
Disclosure of Invention
One of the objectives of the present invention is to provide a remote magnitude transmission and traceability system for dc voltage source, so as to solve the problem of large error caused by remote transmission in the prior art.
One of the objects of the invention is achieved by: a remote magnitude transmission and tracing system for DC voltage source comprises:
the field voltage acquisition module is positioned on the field of the voltage source to be calibrated, is connected with the communication module, and is used for acquiring data of the voltage source to be calibrated and transmitting an acquisition result to the field communication module;
the laboratory voltage acquisition module is positioned in a laboratory, is connected with the communication module and the upper computer, acquires data of the standard voltage source and sends an acquisition result to the upper computer of the laboratory;
a communication module connected with the field voltage acquisition module and the laboratory voltage acquisition module for transmitting the received data of the calibrated voltage source and the data of the standard voltage source to an upper computer through the laboratory voltage acquisition module, and
and the upper computer is connected with the laboratory voltage acquisition module, controls the field voltage acquisition module and the laboratory voltage acquisition module to acquire and transmit data, reads, directionally stores and processes the acquired data to obtain error and uncertainty information, and judges whether the calibration meets the verification requirements or not.
Further, the invention can be realized according to the following technical scheme:
the field voltage acquisition module and the laboratory voltage acquisition module have the same structure and both comprise:
the voltage acquisition terminal circuit is connected with the voltage end to be detected and is used for receiving voltage data of the voltage end to be detected, and transmitting the voltage data to the voltage value acquisition circuit after voltage stabilization and voltage division;
the 3V reference source is connected with the voltage value acquisition circuit and is used for comparing with the acquired voltage value analog signal;
the J-Link is connected with the voltage value acquisition circuit and is used for burning the programmed program and basically debugging the module;
the user key is connected with the voltage value acquisition circuit and used for transmitting the instruction to the voltage value acquisition circuit by a user;
the communication module interface is connected with the voltage value acquisition circuit and is used for transmitting the information of the voltage value acquisition circuit to the communication module by a user; and
and the voltage value acquisition circuit is connected with the voltage acquisition terminal circuit, the 3V reference source, the J-Link, the user key and the communication module interface, and is used for acquiring and preprocessing data of the voltage source to be calibrated according to a user instruction and then transmitting the data to the communication module.
The communication module comprises:
the field communication module is connected with the field voltage acquisition module and the laboratory communication module, and is used for receiving the acquisition result transmitted by the field voltage acquisition module and transmitting the acquisition result to the laboratory communication module; and
and the laboratory communication module is connected with the field communication module and the laboratory voltage acquisition module and used for receiving the corrected voltage source acquisition result sent by the field communication module and sending the corrected voltage source acquisition result to the laboratory voltage acquisition module.
The laboratory voltage acquisition module is connected with the upper computer through a laboratory end computer, and the field voltage acquisition module is connected with the man-machine interaction display module.
The host computer including:
the calibration control module is connected with the laboratory voltage acquisition module and is used for controlling the calibration process, setting the calibration point and executing the control instruction sent by the laboratory voltage acquisition module;
the system management module is connected with the laboratory voltage acquisition module, performs self-checking on software and sets the authority of management personnel; and
and the data processing module is connected with the laboratory voltage acquisition module, processes the data acquired by the field and laboratory voltage acquisition modules and stores the processed data to a designated path on a laboratory PC.
The second objective of the present invention is to provide a method for remote magnitude transmission and tracing of dc voltage source, so as to solve the problems of large measurement error and high cost in the existing method.
The second purpose of the invention is realized by the following steps: a remote magnitude transmission and tracing method for a direct current voltage source comprises the following steps:
A. the direct current voltage source remote magnitude transmission method is applied to the direct current voltage source remote magnitude transmission system of claim 1;
B. starting a client, starting an upper computer to clear cache data, and performing self-checking on software;
C. establishing remote communication, wherein the upper computer controls the laboratory communication module to establish remote communication with the field communication module, and determines that the field communication module can receive an instruction of the laboratory communication module and feeds the instruction back to the laboratory communication module;
D. connecting the calibrated instrument, connecting the calibrated instrument with a field voltage acquisition module, and connecting a standard voltage source with a laboratory voltage acquisition module;
e, setting detection points and sampling times, and setting the detection points and the sampling times according to the detection rules;
collecting and transmitting data, wherein a field voltage collecting module collects a voltage value of the instrument to be calibrated, and the voltage value is preprocessed and then sent to an upper computer together with a time parameter through a field communication module laboratory end communication module and a CPU (central processing unit) of the voltage collecting module; the laboratory voltage acquisition module acquires a voltage value of the standard voltage source, and the voltage value is sent to the upper computer together with the time parameter after being preprocessed;
G. and (3) processing data, wherein the upper computer reads, directionally stores and processes the data value and the time parameter of the calibrated instrument and the data value and the time parameter of the standard voltage source at the same time to obtain error and uncertainty information so as to judge whether the calibration meets the verification requirement.
Further, the invention can be realized according to the following technical scheme:
in the step G, the upper computer evaluates the measurement error and the uncertainty, the storage of the data and the review of the data are the key points of the verification process, and after the data acquisition is completed under the operation conforming to the verification rules, the data processing, including the data storage and the review, is performed, and then the processed data is used for generating the verification report.
In the step C, the upper computer sends a communication verification command to the field communication module through the laboratory communication module, the command comprises time parameters, the field communication module immediately responds that the communication is good after receiving the communication verification command, when the laboratory communication module receives the response that the communication is good, the laboratory communication module records the received time, when the time difference between the command sending time and the response receiving time is less than 100ms, the communication is considered to be good, and otherwise, equipment needs to be reconnected or a calibration place needs to be reselected.
And H, after the verification of one verification point is finished, resetting aiming at a new verification point, and restarting the verification of the new verification point.
The invention adopts a mobile communication (communication module) mode to realize remote quantity value transmission and tracing, so that the acquisition of a calibrated voltage source is not limited by a place environment any more, calibration is carried out on multiple paths of calibrated voltage sources on site, measurement parameters with time information are returned on site and correspond to laboratory measurement parameters, and real-time calibration is realized, thereby leading-in errors caused by time asynchronism can be eliminated. A pair of voltage acquisition modules (a field voltage acquisition module and a laboratory voltage acquisition module) with high enough precision consistency is used for acquiring numerical values of a plurality of voltage sources at a field end and a laboratory standard source, after the numerical values are acquired, the numerical values are transmitted through a mobile communication network (a communication module), data are processed at a laboratory end, and a calibration and verification report is issued. Specifically, a calibration request applied by a field user is monitored in real time, and when an observation period starts, data of the last observation period is collected and processed and transmitted back to a laboratory calibration center. The calibration center processes laboratory data and field returned data, stores and processes the data in a centralized manner on the upper computer, can obtain a measurement result and generate a verification report after the data processing is finished, and can be used for directly sending the data to a field client. Therefore, the situation that the calibrated voltage source is separated from the working environment is avoided, and the calibration activity can be realized in the original working environment of the calibrated voltage source. The remote voltage source calibration system which is not easily influenced by environment and distance realizes high-efficiency, multi-site and multi-path voltage value remote calibration, and meets the requirements of the calibration system on quickness, accuracy, precision and the like.
The system can also be provided with a plurality of field measurement terminals according to the needs, and only one master station laboratory measurement terminal and an analysis center are needed. The remote transmission and tracing of the voltage source magnitude value with the detection point of 0-10V are realized in a remote mode, accurate calibration is realized, simultaneous calibration can be carried out according to a plurality of calibrated voltage sources at the site end, manpower and material resources are saved, and the calibration efficiency is improved. The difficulty that additional errors transmitted in tracing by traditional quantity values are difficult to measure is solved, and real remote calibration is realized. The system has the advantages of quick response, short period, low cost, high precision and manpower and material resources saving, and can carry out simultaneous calibration according to a plurality of calibrated voltage sources at an on-site end.
Compared with the traditional calibration mode, the remote calibration system can simultaneously acquire the voltage values of a plurality of voltage sources on site, greatly shortens the calibration time, reduces the labor cost, improves the calibration efficiency and can finish real-time calibration.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural diagram of the voltage acquisition module of the present invention.
Fig. 3 is a schematic structural diagram of a mobile communication module according to the present invention.
Fig. 4 is a circuit diagram of a voltage value acquisition circuit.
Fig. 5 is a circuit diagram of a 3V reference source.
FIG. 6 is a J-Link circuit diagram.
Fig. 7 is a user key circuit.
Fig. 8 is a voltage acquisition terminal circuit.
Detailed Description
Example 1
As shown in figure 1, the invention comprises a field voltage acquisition module, a field communication module and a man-machine interaction display module at a field end, and a laboratory voltage acquisition module, a laboratory communication module, a laboratory end computer and an upper computer at a laboratory end. The communication module comprises a field communication module and a laboratory communication module.
The field voltage acquisition module is positioned on the field of the voltage source to be calibrated, is connected with the communication module and is used for acquiring data of the voltage source to be calibrated and transmitting an acquisition result to the field communication module; and the calibration device is connected with a human-computer interaction display module and displays the calibration progress and the laboratory instruction. The field voltage acquisition module is also connected with the human-computer interaction display module, and the progress of the calibration process and the display of laboratory-end instructions are displayed at a field end.
And the laboratory voltage acquisition module is positioned in a laboratory and connected with the communication module and the upper computer, acquires data of the standard voltage source, and sends an acquisition result to the upper computer of the laboratory. The laboratory communication module is connected with the upper computer through a laboratory end computer. The lab-side computer is used to display the progress and instructions of the lab-side calibration process.
As shown in fig. 2, the field voltage collecting module and the laboratory voltage collecting module have the same structure, and both comprise: the device comprises a voltage acquisition terminal circuit, a 3V reference source, a J-Link, a user key, a communication module interface and a voltage value acquisition circuit. Meanwhile, the numerical values of the two voltage acquisition modules for the acquisition of the same voltage value are the same, and the nonlinear errors and the stability of the two modules are the same. So as to eliminate the additional error introduced when the two voltage acquisition modules are used for working.
As shown in fig. 8, the voltage acquisition terminal circuit is connected to the voltage end to be measured, and is configured to receive voltage data of the voltage end to be measured, perform voltage stabilization and voltage division, and transmit the voltage data to the voltage value acquisition circuit; as shown in fig. 5, the 3V reference source is connected to the voltage value acquisition circuit for comparison with the acquired voltage value analog signal; as shown in fig. 6, the J-Link is connected to a voltage value acquisition circuit, and is used for burning of the programmed program and basic debugging of the module; as shown in fig. 7, the user key is connected to the voltage value acquisition circuit, and is used for the user to transmit the instruction to the voltage value acquisition circuit; the communication module interface is connected with the voltage value acquisition circuit and is used for a user to transmit the information of the voltage value acquisition circuit to the communication module; and the voltage value acquisition circuit is connected with the voltage acquisition terminal circuit, the 3V reference source, the J-Link, the user key and the communication module interface, and is used for acquiring and preprocessing data of the calibrated voltage source according to a user instruction and transmitting the data to the communication module. As shown in FIG. 4, the voltage value acquisition circuit of the embodiment adopts an STM32F107 VC-2 chip for control. And connecting each peripheral with a corresponding pin, controlling the voltage acquisition module by using an instruction sent by the upper computer, and responding to the instruction which is not sent yet to change the level of the CPU pin so as to complete the instruction sent by the upper computer after receiving the instruction of the upper computer. The multiple pins can ensure connection with a plurality of peripheral devices.
The working principle of the voltage acquisition module is as follows: and the consistency of the field voltage acquisition module and the laboratory voltage acquisition module is verified to meet the requirement of remote calibration. Then the voltage acquisition module is used for carrying out primary acquisition on a voltage value through a voltage acquisition terminal, is connected to a corresponding pin of the CPU, carries out bit-division comparison on the acquired voltage value and a 3V reference power supply in the CPU of the module to convert analog quantity into digital quantity, and finishes the preprocessing of data in the CPU. And the remote data transmission is completed through the connection between the communication module and the communication module.
Consistency verification and uncertainty evaluation of a voltage acquisition module: a plurality of voltage acquisition modules are designed and manufactured, and parameters such as stability, measurement accuracy and uncertainty are evaluated according to the voltage acquisition modules. Programming a program to be burnt into the voltage acquisition module, ensuring that the voltage acquisition module can complete the acquisition function of a basic voltage value, converting the acquired voltage value into a digital quantity to be output, and then obtaining the output condition of each voltage acquisition module aiming at each point voltage value through the verification of a standard source. And carrying out data acquisition verification on the voltage acquisition module and processing the data to carry out A-type uncertainty evaluation. And verifying whether the output of the voltage acquisition module can stably reach a 6-bit half-measurement effect or not, verifying whether stable measurement can be realized or not, and carrying out error analysis on a group of data to obtain uncertainty evaluation, stability analysis and linearity analysis. And selecting a plurality of voltage acquisition modules with better stability and linearity for further correction, and performing system error compensation by using K value restoration according to the measured values to ensure that the digital values of different voltage acquisition modules output by the same voltage source are consistent.
In order to complete accurate acquisition of a direct current voltage value, a voltage acquisition module needs to achieve high-precision acquisition, the voltage value is acquired by designing a circuit structure and adopting the functions of voltage stabilization, filtering, voltage division and the like, the voltage output by an external voltage source is obtained by comparing the voltage value with a 3V reference source, and a voltage analog quantity is converted into a digital quantity. The written program is burned into the CPU of the voltage acquisition module through the J-Link, so that the function of the module is complete, and the connection between the module and the communication module can be successfully established.
The communication module is used for transmitting the received data of the calibrated voltage source and the data of the standard voltage source to the upper computer through the laboratory voltage acquisition module. The communication module comprises a field communication module and a laboratory communication module, and the field communication module is connected with the field voltage acquisition module and used for receiving the acquisition result transmitted by the field voltage acquisition module and transmitting the acquisition result to the laboratory communication module. The laboratory communication module is connected with the laboratory voltage acquisition module and used for sending laboratory control instructions, receiving the corrected voltage source acquisition results sent by the field communication module and sending the corrected voltage source acquisition results to the laboratory voltage acquisition module, namely, the field data is packed and transmitted back.
The laboratory communication module mainly is that two communication modules exchange of signal and data transmission are carried out as the medium through the signal base station of domestic operator, can reach the voltage source real-time measurement in laboratory and scene two places, prevent losing and revealing of data. The GPIO port of the communication module is connected with the GPIO port of the laboratory voltage acquisition module, and the laboratory voltage acquisition module is controlled by the level output by the GPIO port of the communication module to receive a laboratory end or field end signal so as to start calibration work.
As shown in FIG. 3, the communication module of the present invention adopts SIM8200-M2 series SIMCom 5G Sub-6G module, uses SIM card as the core of communication, and the SIM8200-M2 series module supports wireless communication systems such as 5G NR/LTE-FDD/LTE-TDD/HSPA +, etc., and supports the highest download rate of 4Gbps and networking mode of R15G NSA/SA. The SIM8200-M2 series has strong expansion capability, supports rich interfaces such as PCIe, USB3.1, GPIO and the like, and provides great flexibility and easy integration for the application of customers. M.2 encapsulation is adopted, and the type is 3052-S3-B. The AT command is compatible with the SIM7912G/SIM8300G-M2 series module, has high performance, high safety and reliability, and realizes the functions of field and laboratory communication and data transmission.
In order to ensure the accuracy and effectiveness of output remote transmission and complete the function of real-time monitoring, the communication module packs the time quantum of the system clock and the module input (the digital quantity output by the voltage acquisition module), the modem modulates the data packet to the mobile communication network, and the data packet can be directionally sent to the laboratory communication module and demodulated in the laboratory, thereby completing the real-time calibration activities of two places.
In order to ensure the remote quantity value transmission and traceability of a single voltage source or a plurality of voltage sources on site, the invention adopts a mobile communication network to finish the remote transmission of the quantity value. The field voltage acquisition module is designed to acquire one-way or multi-way direct current voltage values, and the acquisition range is 0-10V. And the model is selected according to the function and the applicable scene of the communication module, the program of the voltage acquisition module is programmed, so that the acquisition function of the direct current voltage value of 0-10V can be smoothly completed and transmitted to the mobile network communication module, and the transmission is carried out by taking the mobile network as a medium.
A multi-path high-precision field voltage acquisition module is constructed by designing a circuit, the field voltage acquisition module acquires a voltage value of a field voltage source to be calibrated, a GPIO _ OutPut pin of the field voltage acquisition module is connected with an external input pin of a communication module, data transmission is carried out through the communication module, the data are transmitted to a laboratory communication module (receiving end) through a mobile communication network, the receiving end communication module is connected with an upper computer, the upper computer analyzes a received data packet, and data processing is carried out on the received data. Besides data transmission, the control instruction received on site is also sent by the upper computer in the laboratory and transmitted through the mobile communication network. The laboratory voltage acquisition module is connected with the same site end, and transmits data to the upper computer in a unified manner for storage and processing.
The upper computer is connected with the laboratory voltage acquisition module through a laboratory end computer, controls the field voltage acquisition module and the laboratory voltage acquisition module to acquire and transmit data, reads, directionally stores and processes the acquired data to obtain error and uncertainty information, and judges whether the calibration meets the verification requirements or not. The upper computer comprises a calibration control module, a system management module and a data processing module.
The calibration control module is used for controlling the calibration process, setting the calibration point and executing a control instruction sent by the laboratory voltage acquisition module; the system management module is connected with the laboratory voltage acquisition module, performs self-checking on the software and sets the authority of management personnel so as to ensure the information confidentiality of the software and the calibration process; the data processing module is connected with the laboratory voltage acquisition module, processes data acquired by the field and laboratory voltage acquisition modules, and stores the processed data to a designated path on a laboratory PC. The core of the verification process is data processing, for the evaluation of measurement errors and uncertainty, the key points of the verification process are data storage and data reexamination, data processing is carried out after data acquisition is completed under the operation conforming to the verification regulations, and the processed data is used for generating a verification report.
The standard source method principle of the direct current voltage source calibration specified in the multifunctional standard source calibration specification is as follows: the calibrated voltage source and the multifunctional standard source output the direct current voltage with the same indication value, and the output voltage value of the multifunctional standard source is measured by using a digital multimeter, wherein the measured value is U _ i. And then, measuring the output voltage value of the calibrated voltage source by using the digital multimeter, wherein the measured value is U _ o. The actual value of the voltage output by the multifunctional standard source is U _ ref, so it can be deduced that the actual output voltage of the calibrated dc voltage source is:
U_s＝U_ref+U_o-U_i
the output indication of the calibrated dc voltage source is U _ x, so the indication error equation of the calibrated dc voltage source is:
Δ＝U_x-U_ref-U_o+U_i
in the equation:
u _ x-output indicator of calibrated multifunctional standard source, V;
u _ ref-actual value of output of standard multifunction standard source, V;
u _ o-measuring the measured value, V, of the calibrated multifunctional standard source with a transitional digital multimeter;
u _ i-measured value, V, of a standard, over-the-function standard source measured with a transition digital multimeter.
The relative error formula is expressed as:
γ＝(U_x-U_ref-U_o+U_i)/(U_ref+U_o-U_i)×100％
in the formula: gamma-relative indication error.
In the invention, two voltage acquisition modules with higher consistency are used as transition modules of an intermediate data communication link. The actual voltage output value of the laboratory multifunctional standard source is recorded as U _1, the actual voltage output value of the laboratory multifunctional standard source is collected by the U _ ref voltage collection module, then the actual voltage value collected by the field return voltage collection module and output by the calibrated voltage source is recorded as U _2, and therefore the actual output voltage of the calibrated direct current voltage source is obtained as follows:
U_s＝U_ref+U_2-U_1
and then the output indication U _ s of the calibrated dc voltage source is transmitted back, so the indication error formula of the calibrated dc voltage source is:
Δ＝U_x-U_ref-U_2+U_1
in the equation:
u _ x-the output indicator of the calibrated DC voltage source, V;
u _ ref-actual value of output of standard multifunction standard source, V;
u _2 is the measured value V of the calibrated DC voltage source collected and returned by the field voltage collecting module;
u _ 1-measurement value, V, of standard functional standard source of measurement acquired by laboratory voltage acquisition module.
γ＝(U_x-U_ref-U_2+U_1)/(U_ref+U_2-U_1)×100％
In the formula: gamma-relative indication error.
Example 2
A remote magnitude transmission and tracing method for a direct current voltage source comprises the following steps:
A. the method for transmitting the remote magnitude of the direct-current voltage source is applied to the system for transmitting the remote magnitude of the direct-current voltage source in the embodiment 1.
B. And starting the client, starting the upper computer to clear the cache data, and performing self-checking on the software to ensure that the calibration and verification process is smoothly carried out.
C. And establishing remote communication, wherein the upper computer controls the laboratory communication module to establish remote communication with the field communication module, and determines that the field communication module can receive the instruction of the laboratory communication module and feeds the instruction back to the laboratory communication module.
The upper computer sends a communication verification command to the field communication module through the laboratory communication module, the command comprises time parameters, the field communication module immediately responds that the communication is good after receiving the communication verification command, the laboratory communication module records the received time after receiving the response of the communication good sent on the field, and when the time difference between the command sending time and the response receiving time is less than 100ms, the communication is considered to be good, otherwise, the upper computer needs to reconnect equipment or reselect a calibration place.
D. And connecting the calibrated instrument, connecting the calibrated instrument with the field voltage acquisition module, and connecting the standard voltage source with the laboratory voltage acquisition module.
And E, setting detection points and sampling times, and setting detection points and sampling times according to the detection rules. Wait for the laboratory to start the calibration instructions. The laboratory end specifies the setting of the set point and the output of the standard source, and the field end sets the set point of the calibrated voltage source according to the laboratory specification.
Collecting and transmitting data, collecting a voltage value of the calibrated instrument by a field voltage collecting module, preprocessing the voltage value and time parameters, and sending the voltage value to an upper computer through a field communication module laboratory end communication module and CPU analysis of the voltage collecting module; the laboratory voltage acquisition module acquires a voltage value of a standard voltage source, and the voltage value is sent to the upper computer together with the time parameter after being preprocessed;
G. and (3) processing data, wherein the upper computer simultaneously reads, directionally stores and processes the data value and the time parameter of the calibrated instrument and the data value and the time parameter of the standard voltage source to obtain error and uncertainty information so as to judge whether the calibration meets the verification requirement or not, thereby increasing the reliability of the issued verification certificate. The directional storage is to store the data in a text document for examination.
The upper computer evaluates the measurement error and the uncertainty, the key points of the verification process are data storage and data review, data processing including data storage and data review is performed after data acquisition is completed under the operation conforming to the verification regulations, and then the processed data is used for generating a verification report.
H. After the verification of one verification point is finished, resetting aiming at a new verification point, and restarting the verification of the new verification point.
The method comprises the following steps of B (A-type uncertainty analysis is based on measured data for processing and analysis, and B-type uncertainty analysis is based on experience) measurement uncertainty evaluation: in the whole calibration process, the source of the measured uncertainty is the uncertainty introduced by the output uncertainty of the multifunctional standard voltage source, the laboratory voltage acquisition module is used for acquiring the uncertainty introduced by the output voltage value of the standard device, the field voltage acquisition module is used for outputting the uncertainty introduced by the output uncertainty of the calibrated voltage source, and the field voltage acquisition module is used for acquiring the uncertainty introduced by the voltage value output by the calibrated voltage source.
The system measurement model is as follows:
Δ＝U x -U ref -U 2 +U 1
in the equation:
U x -the output indication of the calibrated dc voltage source, V;
U ref -an output actual value, V, of a standard multifunctional standard source;
U 2 the measured value V of the calibrated direct current voltage source is acquired and transmitted back by the field voltage acquisition module;
U 1 the voltage acquisition module acquires the measured value V of the measurement standard multifunctional standard source.
Taking the 10V detection point as an example, the 10V maximum allowable error given according to the factory specification of the multifunctional standard source is
e＝±(8×10 -6 ×10+4×10 -6 )V＝±8.4×10 -5 V
Half width a =8.4 × 10 -5 V, and within the interval can be considered to be subject to a uniform distribution, including factors
Then:
the maximum allowable error of 10V given according to the factory specifications of the calibrated voltage source is:
e＝±(1×10 -5 ×10+5×10 -6 )V＝±10.5×10 -5 V
half width a =10.5 × 10 -5 V, and within the interval can be considered to be subject to a uniform distribution, including factors
Then:
the uncertainty of the voltage acquisition module is estimated, and the maximum allowable error of the acquisition of the 10V voltage value is as follows:
e＝±(1.2×10 -6 ×10+5×10 -6 )V＝±1.7×10 -5 V
half width a =1.7 × 10 -5 V, and can be considered to be subject to a uniform distribution over the interval, including the factor
Then:
and each sensitivity coefficient is obtained by calculation as follows:
c ref ＝c 2 ＝-1
c x ＝c 1 ＝1
the synthesis uncertainty is:
u 2 (Δ)＝[c x u(U x )] 2 +[c ref u(U ref )] 2 +[c 2 u(U 2 )] 2 +[c 1 u(U 1 )] 2
u(Δ)＝7.53×10 -5 V。
Claims (9)
1. a remote magnitude transmission and tracing system for a direct-current voltage source is characterized by comprising:
the field voltage acquisition module is positioned on the field of the voltage source to be calibrated, is connected with the communication module, and is used for acquiring data of the voltage source to be calibrated and transmitting an acquisition result to the field communication module;
the laboratory voltage acquisition module is positioned in a laboratory, is connected with the communication module and the upper computer, acquires data of the standard voltage source and sends an acquisition result to the upper computer of the laboratory;
the communication module is connected with the field voltage acquisition module and the laboratory voltage acquisition module and is used for transmitting the received data of the calibrated voltage source and the data of the standard voltage source to the upper computer through the laboratory voltage acquisition module; and
and the upper computer is connected with the laboratory voltage acquisition module, controls the field voltage acquisition module and the laboratory voltage acquisition module to acquire and transmit data, reads, directionally stores and processes the acquired data to obtain error and uncertainty information, and judges whether the calibration meets the verification requirements or not.
2. The system for remotely transferring and tracing the magnitude of a direct current voltage source according to claim 1, wherein the field voltage acquisition module and the laboratory voltage acquisition module have the same structure and each comprise:
the voltage acquisition terminal circuit is connected with the voltage end to be detected and is used for receiving voltage data of the voltage end to be detected, and transmitting the voltage data to the voltage value acquisition circuit after voltage stabilization and voltage division;
the 3V reference source is connected with the voltage value acquisition circuit and is used for comparing with the acquired voltage value analog signal;
the J-Link is connected with the voltage value acquisition circuit and is used for burning the programmed program and basically debugging the module;
the user key is connected with the voltage value acquisition circuit and used for transmitting the instruction to the voltage value acquisition circuit by a user;
the communication module interface is connected with the voltage value acquisition circuit and is used for transmitting the information of the voltage value acquisition circuit to the communication module by a user; and
and the voltage value acquisition circuit is connected with the voltage acquisition terminal circuit, the 3V reference source, the J-Link, the user key and the communication module interface, and is used for acquiring and preprocessing data of the voltage source to be calibrated according to a user instruction and then transmitting the data to the communication module.
3. The system of claim 1, wherein the communication module comprises:
the field communication module is connected with the field voltage acquisition module and the laboratory communication module, and is used for receiving the acquisition result transmitted by the field voltage acquisition module and transmitting the acquisition result to the laboratory communication module; and
and the laboratory communication module is connected with the field communication module and the laboratory voltage acquisition module, and is used for receiving the corrected voltage source acquisition result sent by the field communication module and sending the corrected voltage source acquisition result to the laboratory voltage acquisition module.
4. The system for remotely transferring the magnitude of a direct current voltage source and tracing to a source as claimed in claim 1, wherein the laboratory voltage acquisition module is connected with the upper computer through a laboratory end computer, and the field voltage acquisition module is connected with the man-machine interactive display module.
5. The system for remotely transferring and tracing the magnitude of a dc voltage source according to claim 1, wherein said upper computer comprises:
the calibration control module is connected with the laboratory voltage acquisition module and is used for controlling the calibration process, setting the calibration point and executing the control instruction sent by the laboratory voltage acquisition module;
the system management module is connected with the laboratory voltage acquisition module, performs self-checking on software and sets the authority of management personnel; and
and the data processing module is connected with the laboratory voltage acquisition module, processes the data acquired by the field and laboratory voltage acquisition modules and stores the data to a designated path on a laboratory PC.
6. A remote magnitude transmission and tracing method for a direct-current voltage source is characterized by comprising the following steps:
A. the direct current voltage source remote magnitude transmission method is applied to the direct current voltage source remote magnitude transmission system of claim 1;
B. starting a client, starting an upper computer to clear cache data, and performing self-checking on software;
C. establishing remote communication, wherein the upper computer controls the laboratory communication module to establish remote communication with the field communication module, and determines that the field communication module can receive an instruction of the laboratory communication module and feeds the instruction back to the laboratory communication module;
D. connecting the calibrated instrument, connecting the calibrated instrument with a field voltage acquisition module, and connecting a standard voltage source with a laboratory voltage acquisition module;
e, setting detection points and sampling times, and setting detection points and the sampling times according to the detection rules;
collecting and transmitting data, wherein a field voltage collecting module collects a voltage value of the instrument to be calibrated, and the voltage value is preprocessed and then sent to an upper computer together with a time parameter through a field communication module laboratory end communication module and a CPU (central processing unit) of the voltage collecting module; the laboratory voltage acquisition module acquires a voltage value of the standard voltage source, and the voltage value is sent to the upper computer together with the time parameter after being preprocessed;
G. and (3) processing data, wherein the upper computer simultaneously reads, directionally stores and processes the data value and the time parameter of the calibrated instrument and the data value and the time parameter of the standard voltage source to obtain error and uncertainty information so as to judge whether the calibration meets the verification requirement.
7. The method for remote magnitude transmission and tracing of direct current voltage source according to claim 1, wherein in the step G, the upper computer evaluates the measurement error and uncertainty, the storage of data and the reexamination of data are all the key points of the verification process, and after the data acquisition is completed under the operation in accordance with the verification rules, the data processing is performed, including the storage and reexamination of data, and then the processed data is used for the generation of verification reports.
8. The method for transmitting and tracing the source of the direct current voltage source remotely according to claim 1, wherein in the step C, the upper computer sends a communication verification command to the field communication module through the laboratory communication module, the command includes a time parameter, the field communication module immediately responds that the communication is good to the laboratory communication module after receiving the communication verification command, records the received time after the laboratory communication module receives the response that the communication is good, and considers that the communication is good when the time difference between the command sending time and the response receiving time is less than 100ms, otherwise, the device needs to be reconnected or the calibration place needs to be reselected.
9. The method for remote magnitude transmission and tracing of dc voltage source according to claim 1, further comprising a step H of resetting a new verification point after verification of one verification point is completed and restarting verification of the new verification point.
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