A DC voltage source remote value transmission and traceability system and method

Abstract

The present invention provides a system and method for remote value transmission and traceability of a DC voltage source, including a field voltage acquisition module, a laboratory voltage acquisition module, a communication module and a host computer. The present invention adopts a mobile communication (communication module) method to realize remote value transmission and traceability, so that the acquisition of the calibrated voltage source is no longer restricted by the location environment, and the calibration is performed on the multi-channel calibrated voltage source on site, and the measurement parameters with time information are transmitted back on site, and correspond to the laboratory measurement parameters to realize real-time calibration, thereby eliminating the introduced error caused by time asynchrony. In this way, the situation that the calibrated voltage source is out of 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 that is not easily affected by the environment and distance realizes high-efficiency, multi-site, multi-channel voltage value remote calibration, and meets the requirements of the calibration system such as fast, accurate and precise.

Description

Technical Field

[0001] The invention relates to the field of electrical measurement and calibration, in particular to a direct current voltage source remote value transmission and traceability system and method. Background Art

[0002] In this society where high-quality production replaces high-speed production, the accuracy of instruments has a significant impact on the sales and use of products. Metrological calibration is a necessary measure to ensure that the values ​​measured by instruments are accurate and reliable. At present, the technologies used in the field of calibration of measuring instruments are all traditional offline technologies, including the method of transferring standard tables and placing standard measuring instruments on site.

[0003] Transferring standard instruments: Transferring standard instruments from the laboratory to the site. The most important step in the entire calibration process on site is the traceability of the standard table to ensure the higher accuracy level of the standard table. However, it is difficult to maintain the accuracy of the standard table during the transfer process. Additional errors will be generated during the transfer process, and the cause of the error is unknown, the error size is unknown, and it is theoretically impossible to eliminate the error during the transfer process. The process of transferring standard instruments is complicated and cumbersome, and it is impossible to ensure the higher accuracy level of the standard instrument, so it will bring irreversible errors to the on-site calibration.

[0004] Standard measuring instruments are placed on site: standard measuring instruments are placed on site, metrological calibration activities are carried out on site, and the data are brought back to the standard laboratory for processing. In this mode, standard measuring instruments are placed on site, and they need to be regularly brought back to the standard laboratory for calibration to ensure the accuracy and reliability of on-site metrological calibration activities. However, this mode has a long cycle in value transfer and traceability, and is costly, consuming more manpower and material resources, and a large number of additional errors are still generated in the process of returning standard instruments to the laboratory.

[0005] Domestic and foreign studies on remote calibration include Roccotelli et al., who studied the dynamic weighing system based on the Internet of Things technology, and Zhang Jun, who explored the remote calibration method based on the Internet and conducted network simulation. He Huiyu designed and built a component-based remote calibration system that is easy to expand and has strong applicability. Yu Lang et al. analyzed the remote bus calibration system based on ActiveX technology. Guo Jingtao et al. designed a universal remote calibration platform based on the Internet. Zhang Peng et al. described the research and development of remote measurement systems using cloud services. Guo Lei proposed a network measurement and control system that can realize the calibration of standard instruments for on-site video monitoring. The system did not propose calibration details, but only described the monitoring system. The "Research on Remote Calibration System Based on LabVIEW" proposed by the Teaching and Research Support Center of the National University of Defense Technology pointed out the calibration of digital multimeters, but the focus of the full text was the writing and function of the host computer. The meter under test and the standard source were in the same environment, which was not a true remote transmission.

[0006] The calibration of standard voltage sources has always been a cumbersome process, mainly because of the variability and complexity of standard meters during transportation. On-site calibration by transferring standard meters cannot guarantee the impact of environmental factors on standard instruments during the transfer process, introducing a large number of additional errors, and a large amount of human and material resources will be consumed during the transportation of standard meters. Although scholars have done some research on remote calibration, "real" remote calibration of voltage sources is still a blank area. Compared with existing technologies and solutions, remote real-time calibration has not yet been achieved, and the overall calibration process is relatively cumbersome and has low accuracy. Summary of the invention

[0007] One of the purposes of the present invention is to provide a DC voltage source remote value transmission and traceability system to solve the problem of large errors caused by remote transmission in the prior art.

[0008] One of the purposes of the present invention is achieved as follows: A DC voltage source remote value transmission and traceability system, comprising:

[0009] The on-site voltage acquisition module is located at the site of the calibrated voltage source and connected to the communication module, and is used to collect data from the calibrated voltage source and send the collected results to the on-site communication module;

[0010] The laboratory voltage acquisition module is located in the laboratory and connected to the communication module and the host computer to collect data from the standard voltage source and send the collected results to the laboratory host computer;

[0011] The communication module is connected to the field voltage acquisition module and the laboratory voltage acquisition module, and is used to transmit the received data of the calibrated voltage source and the data of the standard voltage source to the host computer through the laboratory voltage acquisition module, and

[0012] The host computer is connected to the laboratory voltage acquisition module to control the field voltage acquisition module and the laboratory voltage acquisition module to collect and transmit data, and read, directionally store and process the collected data to obtain error and uncertainty information to determine whether the calibration meets the verification requirements.

[0013] Furthermore, the present invention can be implemented according to the following technical solutions:

[0014] The field voltage acquisition module and the laboratory voltage acquisition module have the same structure, and both include:

[0015] The voltage acquisition terminal circuit is connected to the voltage terminal to be measured, and is used to receive the voltage data of the voltage terminal to be measured, and transmit it to the voltage value acquisition circuit after voltage stabilization and voltage division;

[0016] A 3V reference source is connected to the voltage value acquisition circuit and is used for comparison with the collected voltage value analog signal;

[0017] J-Link, connected to the voltage value acquisition circuit, is used for burning the written program and basic debugging of the module;

[0018] A user button is connected to the voltage value acquisition circuit and is used for the user to transmit instructions to the voltage value acquisition circuit;

[0019] A communication module interface connected to the voltage value acquisition circuit, and used by the user to transmit information from the voltage value acquisition circuit to the communication module; and

[0020] The voltage value acquisition circuit is connected with the voltage acquisition terminal circuit, the 3V reference source, the J-Link, the user button, and the communication module interface, and is used to acquire the data of the calibrated voltage source according to the user's instructions, and transmit the data to the communication module after pre-processing.

[0021] The communication module includes:

[0022] A field communication module connected to the field voltage acquisition module and the laboratory communication module, for receiving the acquisition results transmitted by the field voltage acquisition module and sending them to the laboratory communication module; and

[0023] The laboratory communication module is connected to the field communication module and the laboratory voltage acquisition module, and is used to receive the calibrated voltage source acquisition result sent by the field communication module and send it to the laboratory voltage acquisition module.

[0024] The laboratory voltage acquisition module is connected to the host computer through a laboratory end computer, and the field voltage acquisition module is connected to a human-computer interaction display module.

[0025] The host computer includes:

[0026] The calibration control module is connected to the laboratory voltage acquisition module and is used to control the calibration process, set calibration points, and execute control instructions issued by the laboratory voltage acquisition module;

[0027] The system management module is connected to the laboratory voltage acquisition module to perform self-checks on the software and set the permissions of management personnel; and

[0028] The data processing module is connected to the laboratory voltage acquisition module to process the data collected by the field and laboratory voltage acquisition modules and store them in a designated way on the laboratory PC.

[0029] The second purpose of the present invention is to provide a method for remote value transmission and traceability of a DC voltage source to solve the problems of large measurement errors and high costs in existing methods.

[0030] The second object of the present invention is achieved as follows: A method for remote value transmission and source tracing of a DC voltage source comprises the following steps:

[0031] A. The DC voltage source remote value transfer and traceability method is applied to the DC voltage source remote value transfer and traceability system;

[0032] B. Start the client, start the host computer to clear the cache data, and the software performs self-check;

[0033] C. Establishing remote communication: the host computer controls the laboratory communication module to establish remote communication with the field communication module, and ensures that the field communication module can receive instructions from the laboratory communication module and feed back to the laboratory communication module;

[0034] D. Connect the instrument to be calibrated, connect the instrument to be calibrated with the on-site voltage acquisition module, and connect the standard voltage source with the laboratory voltage acquisition module;

[0035] E. Set the test points and sampling times according to the test procedures;

[0036] F. Data collection and transmission: The on-site voltage acquisition module collects the voltage value of the calibrated instrument. After preprocessing, the voltage value is sent to the host computer together with the time parameter through the on-site communication module and the laboratory communication module after being analyzed by the CPU of the voltage acquisition module; the laboratory voltage acquisition module collects the voltage value of the standard voltage source. After preprocessing, the voltage value is sent to the host computer together with the time parameter;

[0037] G. Data processing: The host computer reads, stores and processes the data value and time parameters of the calibrated instrument and the data value and time parameters of the standard voltage source at the same time to obtain error and uncertainty information to determine whether the calibration meets the verification requirements.

[0038] Furthermore, the present invention can be implemented according to the following technical solutions:

[0039] In step G, the host computer evaluates the measurement error and uncertainty. Data storage and data review are the key to the verification process. After completing data collection in accordance with the verification procedures, data processing is performed, including data storage and review, and the processed data is then used to generate a verification report.

[0040] In step C, the host computer sends a "verify communication" instruction to the field communication module through the laboratory communication module. The instruction includes a time parameter. After receiving the "verify communication" instruction, the field communication module immediately responds to the laboratory communication module with "good communication". When the laboratory communication module receives the "good communication" response sent by the field, it records the receipt time. When the time difference between the sending instruction time and the receiving response time is less than 100ms, it is considered that the communication is good, otherwise it is necessary to reconnect the equipment or reselect the calibration location.

[0041] The method further comprises a step H of resetting a new calibration point after calibration of one calibration point is completed, and restarting the calibration of the new calibration point.

[0042] The present invention adopts mobile communication (communication module) mode to realize remote value transmission and traceability, so that the collection of the calibrated voltage source is no longer restricted by the location environment, and the calibration is performed for the multi-channel calibrated voltage source on site, and the measurement parameters with time information are transmitted back on site, and correspond to the laboratory measurement parameters, so as to realize real-time calibration, thereby eliminating the introduced error caused by time asynchrony. A pair of voltage acquisition modules (field voltage acquisition module and laboratory voltage acquisition module) with high enough accuracy consistency are used to collect the values ​​of multiple voltage sources on the field end and the laboratory standard source. After the collection of the values ​​is completed, the values ​​are transmitted through the mobile communication network (communication module), and the data is processed at the laboratory end, and a calibration and verification report is issued. Specifically, the calibration request applied by the on-site user is monitored in real time. When an observation cycle begins, the data of the previous observation cycle is collected and processed and transmitted back to the laboratory calibration center. The calibration center processes the laboratory data and the data transmitted back on site and concentrates on the host computer for storage and processing. After the data processing is completed, the measurement results can be obtained and the verification report can be generated, which can be used to send directly to the on-site customer. This avoids the situation where the calibrated voltage source is out of the working environment, and the calibration activities can be carried out in the original working environment of the calibrated voltage source. The remote voltage source calibration system, which is not easily affected by the environment and distance, realizes high-efficiency, multi-site, multi-channel voltage value remote calibration, and meets the requirements of fast, accurate and precise calibration system.

[0043] The system of the present invention can also set up multiple field measurement terminals as needed, and only requires one master station laboratory measurement terminal and analysis center. The present invention realizes the remote transmission and traceability of the value of the voltage source with a calibration point of 0 to 10V in a remote manner, realizes precise calibration, and can perform simultaneous calibration based on multiple calibrated voltage sources at the field end, saving manpower and material resources and improving calibration efficiency. It solves the difficulty of measuring the additional errors in the traditional value transmission and traceability, and realizes remote calibration in a true sense. The system of the present invention has fast response, short cycle, low cost, high precision and saves manpower and material resources, and can perform simultaneous calibration based on multiple calibrated voltage sources at the field end.

[0044] Compared with the traditional calibration method, the remote calibration system of the present invention can simultaneously obtain voltage values ​​for multiple voltage sources on site, greatly shortening the calibration time, reducing labor costs, improving calibration efficiency, and completing real-time calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of the present invention.

[0046] Figure 2 It is a structural schematic diagram of the voltage acquisition module of the present invention.

[0047] Figure 3 It is a structural schematic diagram of the mobile communication module of the present invention.

[0048] Figure 4 It is the circuit diagram of the voltage value acquisition circuit.

[0049] Figure 5 This is the circuit diagram of the 3V reference source.

[0050] Figure 6 This is the J-Link circuit diagram.

[0051] Figure 7 It is the user button circuit.

[0052] Figure 8 It is a voltage collection terminal circuit. DETAILED DESCRIPTION

[0053] Example 1

[0054] like Figure 1 As shown, the present invention includes a field voltage acquisition module, a field communication module, a human-computer interaction display module at the field end, and a laboratory voltage acquisition module, a laboratory communication module, a laboratory computer and a host computer at the laboratory end. The communication module includes a field communication module and a laboratory communication module.

[0055] The on-site voltage acquisition module is located at the site of the calibrated voltage source and connected to the communication module. It is used to collect data from the calibrated voltage source and send the collected results to the on-site communication module. It is connected to the human-computer interaction display module to display the calibration progress and laboratory instructions. The on-site voltage acquisition module is also connected to the human-computer interaction display module to display the progress of the calibration process on the site and the instructions on the laboratory side.

[0056] The laboratory voltage acquisition module is located in the laboratory and connected to the communication module and the host computer. It collects data from the standard voltage source and sends the collected results to the laboratory host computer. The laboratory communication module is connected to the host computer through the laboratory computer. The laboratory computer is used to display the progress and instructions of the calibration process at the laboratory end.

[0057] like Figure 2 As shown in the figure, the field voltage acquisition module and the laboratory voltage acquisition module have the same structure, both of which include: voltage acquisition terminal circuit, 3V reference source, J-Link, user button, communication module interface and voltage value acquisition circuit. At the same time, the two voltage acquisition modules have the same value for the same voltage value, and the nonlinear error and stability of the two modules are the same. This eliminates the additional error introduced by the two voltage acquisition modules when they are used for work.

[0058] Among them, Figure 8 As shown, the voltage acquisition terminal circuit is connected to the voltage end to be measured, and is used to receive the voltage data of the voltage end to be measured, and transmit it to the voltage value acquisition circuit after voltage stabilization and voltage division; Figure 5 As shown, the 3V reference source is connected to the voltage value acquisition circuit for comparison with the collected voltage value analog signal; Figure 6 As shown, J-Link is connected to the voltage value acquisition circuit for burning the written program and basic debugging of the module; Figure 7 As shown, the user button is connected to the voltage value acquisition circuit, and the user transmits the instruction to the voltage value acquisition circuit; the communication module interface is connected to the voltage value acquisition circuit, and the user transmits the information of the voltage value acquisition circuit to the communication module; the voltage value acquisition circuit, the voltage acquisition terminal circuit, the 3V reference source, J-Link, the user button, and the communication module interface are used to collect the data of the calibrated voltage source according to the user's instruction, and transmit it to the communication module after pre-processing. Figure 4 As shown, the voltage value acquisition circuit of this embodiment is controlled by the STM32F107VC-2 chip. Each peripheral is connected to the corresponding pin, and the voltage acquisition module is controlled by sending instructions from the host computer. After receiving the instruction from the host computer, the level of the CPU pin changes according to the instruction response that has not yet been sent to complete the instruction sent by the host computer. Multiple pins can ensure connection with multiple peripherals.

[0059] Working principle of voltage acquisition module: Verify the consistency between the on-site voltage acquisition module and the laboratory voltage acquisition module to meet the remote calibration requirements. Then the voltage acquisition module performs preliminary voltage value acquisition through the voltage acquisition terminal, connects to the corresponding pin of the CPU, compares the collected voltage value with the 3V reference power supply in the module CPU, converts the analog quantity into a digital quantity, and completes the data preprocessing in the CPU. The remote data transmission is completed through the connection with the communication module.

[0060] Consistency verification and uncertainty assessment of voltage acquisition modules: Design and produce several voltage acquisition modules, and evaluate the parameters such as stability, measurement accuracy and uncertainty of the voltage acquisition modules. Write a program and burn it into the voltage acquisition module to ensure that the voltage acquisition module can complete the basic voltage value acquisition function, convert the collected voltage value into digital quantity for output, and then verify it with the standard source to obtain the output of each voltage acquisition module for each point voltage value. Perform data acquisition verification on the voltage acquisition module and process the data for Class A uncertainty assessment. Verify whether the output of the voltage acquisition module can stably achieve a 6.5-bit measurement effect, and verify whether it can be measured stably. Perform error analysis on a set of data to obtain uncertainty assessment, stability analysis, and linearity analysis. Then select several voltage acquisition modules with good stability and linearity for further correction, and use K value repair to compensate for the system error for the measured values ​​to ensure that the digital quantities output by different voltage acquisition modules for the same voltage source are consistent.

[0061] In order to complete the accurate acquisition of DC voltage values, the voltage acquisition module must achieve high-precision acquisition. By designing the circuit structure, voltage stabilization, filtering, voltage division and other functions are adopted to process the collected voltage values. By comparing with the 3V reference source, the voltage output of the external voltage source is obtained, and the voltage analog quantity is converted into a digital quantity. The written program is burned into the CPU of the voltage acquisition module through J-Link, so that the module functions perfectly and can successfully establish a connection with the communication module.

[0062] The communication module is used to transmit the received data of the calibrated voltage source and the data of the standard voltage source to the host computer through the laboratory voltage acquisition module. The communication module includes a field communication module and a laboratory communication module. The field communication module is connected to the field voltage acquisition module to receive the collection results transmitted by the field voltage acquisition module and send them to the laboratory communication module. The laboratory communication module is connected to the laboratory voltage acquisition module to send laboratory control instructions, receive the collection results of the calibrated voltage source sent by the field communication module, and send them to the laboratory voltage acquisition module, that is, the packaging and transmission of field data.

[0063] The laboratory communication module mainly consists of two communication modules that use the signal base station of the domestic operator as an intermediary to exchange signals and transmit data, which can achieve real-time measurement of the voltage source in the laboratory and on-site to prevent data loss and leakage. The GPIO port of the communication module is connected to the GPIO port of the laboratory voltage acquisition module. The level output by the GPIO port of the communication module controls the laboratory voltage acquisition module so that it receives the laboratory end or the field end signal and starts the calibration work.

[0064] like Figure 3 As shown, the communication module of the present invention adopts the SIM8200-M2 series SIMCom 5G Sub-6G module, with the SIM card as the core of communication. The SIM8200-M2 series modules support wireless communication standards such as 5G NR / LTE-FDD / LTE-TDD / HSPA+, and support the highest 4Gbps download rate and R155G NSA / SA networking mode. The SIM8200-M2 series has powerful expansion capabilities, supports rich interfaces such as PCIe, USB3.1, GPIO, etc., and provides great flexibility and easy integration for customers' applications. It adopts M.2 package, and the type is 3052-S3-B. Its AT command is compatible with SIM7912G / SIM8300G-M2 series modules, with high performance, high security and reliability, and realizes the functions of field and laboratory communication and data transmission.

[0065] In order to ensure the accuracy and effectiveness of remote output transmission and to complete the real-time monitoring function, the communication module packages the system clock time and the module input (the digital quantity output by the voltage acquisition module). The modem modulates the data packet onto the mobile communication network, which can be sent to the laboratory communication module and demodulated in the laboratory, thereby completing the real-time calibration activities between the two locations.

[0066] In order to ensure the remote value transmission and traceability of a single voltage source or multiple voltage sources on site, the present invention intends to use a mobile communication network to complete the remote transmission of the value. By designing an on-site voltage acquisition module, single-channel or multi-channel DC voltage value acquisition is performed, and the acquisition range is 0-10V. And according to the function and applicable scenario of the communication module, the voltage acquisition module program is written so that it can successfully complete the acquisition function of 0-10V DC voltage value and transmit it to the mobile network communication module, and transmit it with the help of the mobile network as the medium.

[0067] By designing the circuit, a multi-channel high-precision field voltage acquisition module is constructed. The field voltage acquisition module obtains the voltage value of the calibrated voltage source on site, and then connects the GPIO_OutPut pin of the field voltage acquisition module with the peripheral input pin of the communication module. Then, the communication module is used to transmit the data, and the data is transmitted to the laboratory communication module (receiving end) through the mobile communication network. The receiving end communication module is connected to the host computer, and the host computer parses the received data packets, saves them, and processes the received data. In addition to data transmission, the control instructions received on site are also sent by the laboratory host computer and transmitted through the mobile communication network. The connection of the laboratory voltage acquisition module is the same as that of the field end, and the data is uniformly transmitted to the host computer for storage and processing.

[0068] The host computer is connected to the laboratory voltage acquisition module through the laboratory computer, controls the field voltage acquisition module and the laboratory voltage acquisition module to collect and transmit data, and reads, stores and processes the collected data to obtain error and uncertainty information to determine whether the calibration meets the verification requirements. The host computer includes a calibration control module, a system management module and a data processing module.

[0069] Among them, the calibration control module is used to control the calibration process, set the calibration points, and execute the control instructions issued by the laboratory voltage acquisition module; the system management module is connected to the laboratory voltage acquisition module to perform self-checks on the software and set the permissions of the management personnel to ensure the confidentiality of the software and the calibration process; the data processing module is connected to the laboratory voltage acquisition module to process the data collected by the field and laboratory voltage acquisition modules and store them in the designated path on the laboratory PC. The core of the verification process is data processing. The evaluation of measurement errors and uncertainties, the storage of data, and the review of data are all key to the verification process. After completing data collection in accordance with the verification procedures, data processing is performed and the processed data is used to generate the verification report.

[0070] The principle of the standard source method for calibrating a DC voltage source as specified in the multifunctional standard source calibration specification is as follows: the voltage source to be calibrated and the multifunctional standard source output a DC voltage of the same indication. First, use a digital multimeter to measure the output voltage value of the multifunctional standard source, and the measured value is U_i. Then use a digital multimeter to measure the output voltage value of the voltage source to be calibrated, and the measured value is U_o. The actual value of the voltage output by the multifunctional standard source is U_ref, from which it can be deduced that the actual output voltage of the DC voltage source to be calibrated is:

[0071] U_s=U_ref+U_o-U_i

[0072] The output indication of the calibrated DC voltage source is U_x, so the indication error formula of the calibrated DC voltage source is:

[0073] Δ=U_x-U_ref-U_o+U_i

[0074] In the equation:

[0075] U_x——output index of the calibrated multifunctional standard source, V;

[0076] U_ref——actual output value of standard multifunctional standard source, V;

[0077] U_o——the measured value of the calibrated multifunctional standard source measured by the transition digital multimeter, V;

[0078] U_i——The measured value of the standard passing function standard source measured by the transition digital multimeter, V.

[0079] The relative error formula is expressed as:

[0080] γ=(U_x-U_ref-U_o+U_i) / (U_ref+U_o-U_i)×100%

[0081] Where: γ——relative indication error.

[0082] In the present invention, two voltage acquisition modules with relatively high consistency are used as transition modules for the intermediate data exchange link. The actual output value of the voltage of the laboratory multifunctional standard source is recorded as U_ref. The output value of the laboratory multifunctional standard source collected by the voltage acquisition module is U_1. Then, the voltage value of the calibrated voltage source output collected by the voltage acquisition module is transmitted back on site, which is recorded as U_2. From this, the actual output voltage of the calibrated DC voltage source can be obtained as:

[0083] U_s=U_ref+U_2-U_1

[0084] 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:

[0085] Δ=U_x-U_ref-U_2+U_1

[0086] In the equation:

[0087] U_x——output index of the calibrated DC voltage source, V;

[0088] U_ref——actual output value of standard multifunctional standard source, V;

[0089] U_2——Measurement value of the calibrated DC voltage source collected and transmitted back by the field voltage acquisition module, V;

[0090] U_1——The measured value of the standard source of the measurement standard function collected by the laboratory voltage acquisition module, V.

[0091] γ=(U_x-U_ref-U_2+U_1) / (U_ref+U_2-U_1)×100%

[0092] Where: γ——relative indication error.

[0093] Example 2

[0094] A method for remote value transmission and traceability of a DC voltage source comprises the following steps:

[0095] A. The DC voltage source remote value transmission method is applied to the DC voltage source remote value transmission system described in Example 1.

[0096] B. Start the client and the host computer to clear the cache data, and the software performs a self-check to ensure that the calibration process goes smoothly.

[0097] C. Establish remote communication. The host computer controls the laboratory communication module to establish remote communication with the field communication module, and ensures that the field communication module can receive instructions from the laboratory communication module and feed back to the laboratory communication module.

[0098] Among them, the upper computer sends a "verify communication" instruction to the field communication module through the laboratory communication module. The instruction contains a time parameter. After receiving the "verify communication" instruction, the field communication module immediately responds to the laboratory communication module with "good communication". When the laboratory communication module receives the "good communication" response sent by the field, it records the receipt time. When the time difference between the sending instruction time and the receiving response time is less than 100ms, it is considered that the communication is good, otherwise it is necessary to reconnect the equipment or reselect the calibration location.

[0099] D. Connect the instrument to be calibrated, connect the instrument to be calibrated with the on-site voltage acquisition module, and connect the standard voltage source with the laboratory voltage acquisition module.

[0100] ESet the test points and sampling times. Set the test points and sampling times according to the verification procedures. Wait for the laboratory to start calibration instructions. The laboratory specifies the setting of the test points and the output of the standard source. The field end sets the test points of the calibrated voltage source according to the laboratory regulations.

[0101] F. Data collection and transmission: The on-site voltage acquisition module collects the voltage value of the calibrated instrument. After preprocessing, the voltage value is sent to the host computer together with the time parameter through the on-site communication module and the laboratory communication module after being analyzed by the CPU of the voltage acquisition module; the laboratory voltage acquisition module collects the voltage value of the standard voltage source. After preprocessing, the voltage value is sent to the host computer together with the time parameter;

[0102] G. Data processing: The host computer reads, stores and processes the data value and time parameters of the calibrated instrument and the data value and time parameters of the standard voltage source at the same time, obtains error and uncertainty information, and determines whether the calibration meets the verification requirements, thereby increasing the reliability of the verification certificate issued. Directed storage is to store data in a text document for inspection.

[0103] Among them, the host computer evaluates the measurement error and uncertainty. The storage and review of data are the key to the calibration process. After completing the data collection in accordance with the calibration procedures, data processing is carried out, including data storage and review. The processed data is then used to generate the calibration report.

[0104] H. After the calibration of a calibration point is completed, reset the calibration point to a new one and restart the calibration of the new calibration point.

[0105] This method is Class B (Class A uncertainty analysis is based on measured data processing and analysis, Class B uncertainty analysis is based on experience analysis) measurement uncertainty assessment: In the entire calibration process, the sources of measurement uncertainty include the uncertainty introduced by the inaccurate output of the multi-function standard voltage source, the uncertainty introduced by the laboratory voltage acquisition module for obtaining the output voltage value of the standard device, the uncertainty introduced by the inaccurate output of the on-site calibrated voltage source, and the uncertainty introduced by the on-site voltage acquisition module for obtaining the output voltage value of the calibrated voltage source.

[0106] The system measurement model is:

[0107] Δ=U x -U ref -U2+U1

[0108] In the equation:

[0109] U x ——Output index of the calibrated DC voltage source, V;

[0110] U ref ——Actual output value of the standard multifunctional standard source, V;

[0111] U2——Measurement value of the calibrated DC voltage source collected and transmitted back by the field voltage acquisition module, V;

[0112] U1——The measured value of the multifunctional standard source collected by the voltage acquisition module, V.

[0113] Taking the 10V calibration point as an example, the maximum allowable error of 10V given in the factory manual of the multi-function standard source is

[0114] e=±(8×10 -6 ×10+4×10 -6 )V=±8.4×10 -5 V

[0115] Half width a=8.4×10 -5 V, and can be considered to obey uniform distribution within the interval, including factors but:

[0116]

[0117] According to the factory manual of the calibrated voltage source, the maximum allowable error of 10V is:

[0118] e=±(1×10 -5 ×10+5×10 -6 )V=±10.5×10 -5 V

[0119] Half width a=10.5×10 -5 V, and can be considered to obey uniform distribution within the interval, including factors but:

[0120]

[0121] The uncertainty of the voltage acquisition module is estimated. For the acquisition of 10V voltage value, the maximum allowable error is:

[0122] e=±(1.2×10 -6 ×10+5×10 -6 )V=±1.7×10 -5 V

[0123] Half width a=1.7×10 -5 V, and can be considered to obey uniform distribution within the interval, including factors but:

[0124]

[0125] According to the calculation, the sensitivity coefficients are:

[0126] c ref =c2=-1

[0127] cx =c1=1

[0128] The combined uncertainty is:

[0129] u 2 (Δ)=[c x u(U x )] 2 +[c ref u(U ref )] 2 +[c2u(U2)] 2 +[c1u(U1)] 2

[0130] u(Δ)=7.53×10 -5 V.

Claims

1. A DC voltage source remote value transmission and traceability system, characterized in that: Included are: The on-site voltage acquisition module is located at the site of the calibrated voltage source and connected to the communication module, and is used to collect data from the calibrated voltage source and send the collected results to the on-site communication module; The laboratory voltage acquisition module is located in the laboratory and connected to the communication module and the host computer to collect data from the standard voltage source and send the collected results to the laboratory host computer; The communication module is connected to the field voltage acquisition module and the laboratory voltage acquisition module, and is used to transmit the received data of the calibrated voltage source and the data of the standard voltage source to the host computer through the laboratory voltage acquisition module, and The host computer is connected to the laboratory voltage acquisition module to control the field voltage acquisition module and the laboratory voltage acquisition module to collect and transmit data, and read, directionally store and process the collected data to obtain error and uncertainty information to determine whether the calibration meets the verification requirements.

2. The DC voltage source remote value transmission and traceability system according to claim 1 is characterized in that: The field voltage acquisition module and the laboratory voltage acquisition module have the same structure, and both include: The voltage acquisition terminal circuit is connected to the voltage terminal to be measured, and is used to receive the voltage data of the voltage terminal to be measured, and transmit it to the voltage value acquisition circuit after voltage stabilization and voltage division; A 3V reference source is connected to the voltage value acquisition circuit and is used for comparison with the collected voltage value analog signal; J-Link, connected to the voltage value acquisition circuit, is used for burning the written program and basic debugging of the module; A user button is connected to the voltage value acquisition circuit and is used for the user to transmit instructions to the voltage value acquisition circuit; The communication module interface is connected to the voltage value acquisition circuit and is used for the user to transmit the information of the voltage value acquisition circuit to the communication module; as well as The voltage value acquisition circuit is connected with the voltage acquisition terminal circuit, the 3V reference source, the J-Link, the user button, and the communication module interface, and is used to acquire the data of the calibrated voltage source according to the user's instructions, and transmit the data to the communication module after pre-processing.

3. The DC voltage source remote value transmission and traceability system according to claim 1 is characterized in that: The communication module includes: The field communication module is connected to the field voltage acquisition module and the laboratory communication module, and is used to receive the acquisition results transmitted by the field voltage acquisition module and send them to the laboratory communication module; as well as The laboratory communication module is connected to the field communication module and the laboratory voltage acquisition module, and is used to receive the calibrated voltage source acquisition result sent by the field communication module and send it to the laboratory voltage acquisition module.

4. The DC voltage source remote value transmission and traceability system according to claim 1 is characterized in that: The laboratory voltage acquisition module is connected to the host computer through a laboratory end computer, and the field voltage acquisition module is connected to a human-computer interaction display module.

5. The DC voltage source remote value transmission and traceability system according to claim 1 is characterized in that: The host computer includes: The calibration control module is connected to the laboratory voltage acquisition module and is used to control the calibration process, set calibration points, and execute control instructions issued by the laboratory voltage acquisition module; The system management module is connected to the laboratory voltage acquisition module to perform self-checks on the software and set the permissions of management personnel; as well as The data processing module is connected to the laboratory voltage acquisition module to process the data collected by the field and laboratory voltage acquisition modules and store them in a designated way on the laboratory PC.

6. A method for remote value transmission and traceability of a DC voltage source, characterized in that: The steps include: A. The DC voltage source remote value transmission and traceability method is applied to the DC voltage source remote value transmission and traceability system according to claim 1; B. Start the client, start the host computer to clear the cache data, and the software performs self-check; C. Establishing remote communication: the host computer controls the laboratory communication module to establish remote communication with the field communication module, and ensures that the field communication module can receive instructions from the laboratory communication module and feed back to the laboratory communication module; D. Connect the instrument to be calibrated, connect the instrument to be calibrated with the on-site voltage acquisition module, and connect the standard voltage source with the laboratory voltage acquisition module; E. Set the test points and sampling times according to the test procedures; F. Data collection and transmission: The on-site voltage acquisition module collects the voltage value of the calibrated instrument. After preprocessing, the voltage value is sent to the host computer together with the time parameter through the on-site communication module and the laboratory communication module after being analyzed by the CPU of the voltage acquisition module; the laboratory voltage acquisition module collects the voltage value of the standard voltage source. After preprocessing, the voltage value is sent to the host computer together with the time parameter; G. Data processing: The host computer reads, stores and processes the data value and time parameters of the calibrated instrument and the data value and time parameters of the standard voltage source at the same time to obtain error and uncertainty information to determine whether the calibration meets the verification requirements.

7. The method for remote value transmission and traceability of a DC voltage source according to claim 6 is characterized in that In step G, the host computer evaluates the measurement error and uncertainty. Data storage and data review are the key to the verification process. After completing data collection in accordance with the verification procedures, data processing is performed, including data storage and review, and then the processed data is used to generate a verification report.

8. The method for remote value transmission and traceability of a DC voltage source according to claim 6 is characterized in that In step C, the host computer sends a "verify communication" instruction to the field communication module through the laboratory communication module. The instruction includes a time parameter. After receiving the "verify communication" instruction, the field communication module immediately responds to the laboratory communication module with "good communication". When the laboratory communication module receives the "good communication" response sent by the field, it records the receipt time. When the time difference between the sending instruction time and the receiving response time is less than 100ms, it is considered that the communication is good, otherwise it is necessary to reconnect the equipment or reselect the calibration location.

9. The method for remote value transmission and traceability of a DC voltage source according to claim 6 is characterized in that: The method further comprises a step H of resetting a new calibration point after calibration of one calibration point is completed, and restarting the calibration of the new calibration point.

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