CN113933614B - Distributed virtual network instrument and meter measuring system and method - Google Patents
Distributed virtual network instrument and meter measuring system and methodInfo
- Publication number
- CN113933614B CN113933614B CN202010602480.4A CN202010602480A CN113933614B CN 113933614 B CN113933614 B CN 113933614B CN 202010602480 A CN202010602480 A CN 202010602480A CN 113933614 B CN113933614 B CN 113933614B
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- measurement
- measuring
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- relay
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
- G01R31/60—Identification of wires in a multicore cable
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention relates to a distributed virtual network instrument and meter measuring system and method, comprising an upper computer, a concentrator and a plurality of mobile measuring terminals, wherein the upper computer is connected with each mobile measuring terminal through the concentrator, the mobile measuring terminal comprises a controller, a radio frequency unit, a main circuit, a plurality of measuring channels, a plurality of measuring condition generating units and a plurality of sampling units, one end of the main circuit is respectively connected with each sampling unit, each measuring channel and each measuring condition generating unit, a first relay is arranged between each measuring condition generating unit and the main circuit, a second relay is arranged between each measuring condition generating unit and the main circuit, the first relay and the second relay are both connected with the controller, and the radio frequency unit is connected with the controller. Compared with the prior art, the invention designs the mobile measurement terminal which can be distributed at each position and deployed in a distributed mode, thereby improving the efficiency and flexibility of large-scale measurement.
Description
Technical Field
The invention relates to a network test system, in particular to a distributed virtual network instrument and meter measurement system and method.
Background
In the production of rail transit equipment or in the field of construction of an on-track traffic engineering, cables and wire harnesses are used as basic media for signal transmission, and a large number of installation, assembly, measurement, test and sequencing works are involved. Meanwhile, during operation and maintenance of the system, cable faults of all kinds are often the most common. The reasons for the appearance are that on one hand, the number of the harnesses is large, if a cabinet is taken as a rough relatively independent functional unit, tens of beams, hundreds or thousands of beams are few, the workload is extremely large, particularly the condition of mixed wires is involved, the workload required to be measured is remarkable, 100% measurement can be rarely realized in fact, the condition of one, two or even three wiring is involved before the system is started up, on the other hand, the technical content is low, professional equipment is few, the 'crude activity' itself has little technical content, few professional measurement test equipment is provided, the condition is self-researched, the system maturity and the reusability are also extremely serious problems. Thus, automated measurement and scientific management of wire harnesses remain in a relatively primitive stage, whether from quality management by the manufacturer or daily maintenance management by the operation and maintenance enterprises.
Disclosure of Invention
The invention aims to provide a distributed virtual network instrument and meter measuring system and a distributed virtual network instrument and meter measuring method, wherein a mobile measuring terminal is designed and can be distributed at each position, and the distributed virtual network instrument and meter measuring system and the distributed virtual network instrument and meter measuring method are deployed in a distributed mode, so that the efficiency and the flexibility of large-range measurement are improved.
The aim of the invention can be achieved by the following technical scheme:
The distributed virtual network instrument and meter measuring system comprises an upper computer, a concentrator and a plurality of mobile measuring terminals, wherein the upper computer is connected with the mobile measuring terminals through the concentrator, the mobile measuring terminals comprise a controller, a radio frequency unit, a main circuit, a plurality of measuring channels, a plurality of measuring condition generating units and a plurality of sampling units, one end of the main circuit is respectively connected to the sampling units, the measuring channels and the measuring condition generating units, a first relay is arranged between the measuring condition generating units and the main circuit, a second relay is arranged between the measuring condition generating units and the main circuit, the first relay and the second relay are connected with the controller, and the radio frequency unit is connected with the controller.
The kind of the measurement condition generating unit at least comprises a voltage condition generator, a waveform generator and a pulse generator.
The sampling unit comprises at least a voltage and current sampling unit, a waveform sampling unit and a pulse sampling unit.
The first relay and the second relay are both solid state relays.
The first relay and the second relay are electromagnetic relays.
The mobile measurement terminal also comprises a power supply and common ground unit.
The measuring system further comprises an interface adaptation unit, through which the meter measuring system is connected to the object to be measured.
The upper computer is a computer.
A measurement method of the measurement system as described above, comprising:
step S1, each mobile measurement terminal continuously monitors a control instruction of an upper computer through a radio frequency unit, and closes a corresponding first relay and a corresponding second relay based on the control instruction after receiving the control instruction of the upper computer;
Step S2, executing condition generation by a corresponding condition generation unit of the mobile measurement terminal working on condition generation and transmission;
And step S3, the corresponding sampling units working on the mobile measurement terminal for receiving and measuring sample data, obtain a measurement result and send the measurement result to the upper computer.
In the step S3, if the mobile measurement terminal operating on the receiving and measuring is known but the measurement channel is unknown, the mobile measurement terminal operating on the receiving and measuring traverses all the measurement channels, and the condition is satisfied for re-measurement;
If the mobile measurement terminal is unknown to work in the receiving and measuring process, all the mobile measurement terminals in the network are started to be in a monitoring state except the mobile measurement terminal which works in the condition generating and transmitting process, and after receiving the information, the mobile measurement terminals are interrupted and reported to the upper computer, and the upper computer informs the other mobile measurement terminals in a broadcasting mode.
Compared with the prior art, the invention has the following beneficial effects:
1) The mobile measurement terminal is designed, can be distributed at various positions, and is deployed in a distributed mode, so that the efficiency and the flexibility of large-range measurement are improved.
2) The mobile measurement terminal realizes multi-channel program control automatic selection and switching, is very suitable for multi-channel, multi-node and large-capacity test scenes, such as cable sequencing, wiring measurement, mixed wire test and the like, and the traditional instruments and meters are mainly only suitable for single-channel measurement.
3) The test condition generation and the sending and receiving and the measurement can be separated.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of a mobile measurement terminal;
Wherein: 1, a mobile measurement terminal, 2, a concentrator, 3, an upper computer, 13, a controller, 14, a power supply and common ground unit, 15, a radio frequency unit, 16, a main circuit, 17, a relay control unit, 111, a voltage condition generator, 112, a waveform generator, 113, a pulse generator, 114, other measurement condition generating units, 121, a voltage and current sampling unit, 122, a waveform sampling unit, 123, a pulse sampling unit, 124 and other sampling units.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
With the rapid development of new technology and the rising of intelligent manufacturing in recent years, the social technical conditions are gradually improved, and the application provides a relatively mature distributed virtual network instrument and meter measuring system and a method thereof based on the low-power wireless transmission technology, the low-power SOC technology, the virtual instrument and meter technology and the automatic measuring technology.
A distributed virtual network instrument and meter measuring system is shown in fig. 1, and comprises an upper computer 3, a concentrator 2 and a plurality of mobile measuring terminals 1, wherein the upper computer 3 is a computer, carries on and runs virtual network instrument and meter testing software and distributed equipment management software, the upper computer 3 is connected with each mobile measuring terminal 1 through the concentrator 2, each testing terminal is distributed in different physical spaces and connected with the upper computer 3 through a wireless channel, and distributed condition sending, measuring, scheduling of measuring resources, and receiving and executing delegation of testing and measuring work and front end acquisition and processing of measuring tasks are realized. As shown in fig. 2, unlike a general multimeter, the mobile measurement terminal 1 includes a controller 13, a radio frequency unit 15, a main circuit 16, a plurality of measurement channels, a plurality of measurement condition generating units and a plurality of sampling units, wherein the controller 13 is implemented by a conventional MCU, the radio frequency module may be a conventional WiFi module, one end of the main circuit 16 is respectively connected to each sampling unit, each measurement channel and each measurement condition generating unit, a first relay is disposed between each measurement condition generating unit and the main circuit 16, a second relay is disposed between each measurement condition generating unit and the main circuit 16, the first relay and the second relay are both connected with the controller 13, and the radio frequency unit 15 is connected with the controller 13.
The kinds of the measurement condition generating units include at least a voltage condition generator 111, a waveform generator 112, and a pulse generator 113, and the kinds of the sampling units include at least a voltage-current sampling unit 121, a waveform sampling unit 122, and a pulse sampling unit 123.
The first relay and the second relay are both solid state relays, and in other embodiments, the first relay and the second relay are both electromagnetic relays. The control ends of the first relay and the second relay are integrated into a relay control unit 17 for realizing program control switching of channel switching and automatically matching a receiving-transmitting channel according to a system instruction, a measurement function part mainly comprises signal acquisition, and the signals comprise voltage, pulse or waveform, IO quantity and the like, and the sending and receiving sampling measurement of the test conditions are not in a terminal unit during measurement.
The mobile measurement terminal 1 further comprises a power supply and common ground unit 14, and because the test condition and the function measurement are not in one equipment unit, common ground processing is an indispensable part, the system supports four common ground modes, namely channel ground, equal line length common ground, cabinet common ground and ground, and the MCU is responsible for the execution-processing of mobile local measurement results, the scheduling-management of resources, the transceiving processing of remote instructions and the realization of protocols.
The measuring system further comprises an interface adaptation unit, through which the meter measuring system is connected to the object to be measured. In view of the reusability of the system, the mobile measurement terminal 1 is designed according to standard products, but in practical application, a specific scene is generally involved or an interface is relatively complicated, so that an interface adapting unit is generally involved when finally connecting to a measured object. This part is mainly provided by various forms of physical wiring and forms of transducers or heads.
The virtual network instrument and meter test software is responsible for generating test sequences and logic, generating and sending test instructions, processing test results, displaying process data and results in real time and the like. For example, the conditions of on-off, impedance or mixed line of the test wire harness can be led into a test system through a standard configuration template EXEL table prepared in advance, the system coordinates the configured test terminal through a distributed network, and then determines whether a condition generating function connected to a cable end or a test sampling function module is started, meanwhile, after the opposite end test obtains data, the data are reported to virtual network instrument and meter test software, and the platform processes the received data. The platform realizes the state information and data processing of the test process and generates a test result and a test report. In addition, the technical details are that the private protocol can be supported between the test software and the test terminal, the standard SCPI protocol can be supported, the standard protocol can be compatible with the NI test platform and the keysight test platform, and the SDK and the API are provided to facilitate the integration of users into the automatic measurement system.
And the distributed equipment management software is that the test terminal logically forms a star-shaped distributed network by taking the platform as a convergence core. And the system is responsible for wireless access management and running state management of the mobile measurement terminal 1, and supports the upper layer virtual network instrument and meter test software and a service channel of the mobile measurement terminal 1. Wherein the radio access technology is not limited to wireless communication technologies such as Lora, NBIOT, 4G, 5G, bluetooth, WIFI, zigbee, thread, 433, etc. NBIOT or 4G and 4G modules can be added to functional terminals with larger spans between the test receiving and transmitting nodes, so that test of test objects with larger coverage areas can be realized. The device management software is also used for realizing remote control, scheduling and management of the bottom layer devices.
The measuring method of the measuring system comprises the following steps:
step S1, each mobile measurement terminal 1 continuously monitors a control instruction of an upper computer 3 through a radio frequency unit 15, and closes a corresponding first relay and a corresponding second relay based on the control instruction after receiving the control instruction of the upper computer 3;
step S2, executing condition generation by a corresponding condition generation unit of the mobile measurement terminal 1 working at condition generation and sending;
And step S3, the corresponding sampling units working on the mobile measurement terminal 1 for receiving and measuring sample data, obtain a measurement result and send the measurement result to the upper computer 3.
In step S3, if the mobile measurement terminal 1 operating on the reception and measurement is known but the measurement channel is unknown, the mobile measurement terminal 1 operating on the reception and measurement traverses all the measurement channels, and the condition is satisfied for re-measurement;
If the mobile measurement terminal 1 which is not known to work in the receiving and measuring process is not known, all the mobile measurement terminals 1 in the network are started to be in a monitoring state except for the mobile measurement terminal 1 which is used in the condition generating and transmitting process, and after receiving the information, the mobile measurement terminals 1 are interrupted and reported to the upper computer 3, and the upper computer 3 informs the other mobile measurement terminals 1 in a broadcasting mode.
Specifically, the mobile measurement terminal 1 has two basic working states, namely, the measurement condition generation-sending and receiving sampling, measuring, when in which working state, and the upper computer 3 determines according to the measurement content, and the mobile measurement terminal 1 receives a remote control instruction through the wireless RF unit. When in the measurement condition generation-transmission, the relay control unit 17 gates the required test condition, such as the test voltage in fig. 1, according to the received measurement sequence of the measurement condition transmission, the measured measurement item requirement, and R1 is closed. And then according to the measuring channel, program-controlled switching and selection of the measuring channel are realized, such as C1 closing when the channel 1 is currently measured. After the condition is output, the current and the voltage value output at this time are acquired through a voltage and current sampling unit and are sent to the upper computer 3 through wireless.
In measurement, the mobile measurement terminal 1 performs conditional transmission and reception in correspondence with two different units, one is measurement condition generation-transmission and one is reception-measurement. Different test condition generation-transmission-reception-measurement in one network can execute measurement tasks in parallel, the tasks are delegated by the upper computer 3 according to the test tasks and equipment states, and the upper computer 3 coordinates the scheduling and management of measurement resources in the network.
After the measurement condition is sent out, if the receiving-measuring unit opens a predicted measuring channel in a predicted state, if the resistance measurement is currently performed, the MCU reports the data of the receiving-measuring end by reading the data acquired by the receiving end of the voltage and current acquisition unit. The upper computer 3 receives the voltage and current numerical information of the condition generation-sending end and the condition generation-measuring end, calculates the resistance impedance of the intermediate connection medium according to the voltage difference and the current, traverses all local channels if the receiving terminal predicts the receiving channel and meets the condition for re-measurement, and if the receiving terminal can not predict the receiving channel, all the mobile measuring terminals 1 except the condition generation-sending terminal in the network are started to be in a monitoring state, once the information is received, the interrupt processing is carried out, the upper computer 3 is notified, and then the upper computer 3 notifies other terminals in a broadcasting mode, wherein the terminal is changed into a low power consumption state.
And the other test functions are similar to each other, so that the measurement tasks and the scheduling and delegation of the resources in the network are completed, and the state change and control of each node device of the system are received.
Claims (8)
1. The measuring method of the distributed virtual network instrument measuring system is characterized in that the measuring system comprises an upper computer, a concentrator and a plurality of mobile measuring terminals, wherein the upper computer is connected with each mobile measuring terminal through the concentrator, the mobile measuring terminals comprise a controller, a radio frequency unit, a main circuit, a plurality of measuring channels, a plurality of measuring condition generating units and a plurality of sampling units, one end of the main circuit is respectively connected with each sampling unit, each measuring channel and each measuring condition generating unit, a first relay is arranged between each measuring condition generating unit and the main circuit, a second relay is arranged between each measuring channel and the main circuit, the first relay and the second relay are both connected with the controller, and the radio frequency unit is connected with the controller;
the measuring system further comprises an interface adapting unit, and the instrument measuring system is connected to the measured object through the interface adapting unit;
The measuring method comprises the following steps:
step S1, each mobile measurement terminal continuously monitors a control instruction of an upper computer through a radio frequency unit, and closes a corresponding first relay and a corresponding second relay based on the control instruction after receiving the control instruction of the upper computer;
Step S2, executing condition generation by a corresponding condition generation unit of the mobile measurement terminal working on condition generation and transmission;
And step S3, the corresponding sampling units working on the mobile measurement terminal for receiving and measuring sample data, obtain a measurement result and send the measurement result to the upper computer.
2. The measurement method according to claim 1, wherein the kinds of the measurement condition generating units include at least a voltage condition generator, a waveform generator, and a pulse generator.
3. The measurement method according to claim 1, wherein the kinds of the sampling units include at least a voltage-current sampling unit, a waveform sampling unit, and a pulse sampling unit.
4. The method of measurement according to claim 1, wherein the first relay and the second relay are both solid state relays.
5. The measurement method according to claim 1, wherein the first relay and the second relay are each electromagnetic relays.
6. The measurement method according to claim 1, wherein the mobile measurement terminal further comprises a power supply and common ground unit.
7. The method of claim 1, wherein the host computer is a computer.
8. The method according to claim 1, wherein in the step S3, if the mobile measurement terminal operating on the reception and measurement is known but the measurement channel is unknown, the mobile measurement terminal operating on the reception and measurement traverses all the measurement channels, and the condition is satisfied for re-measurement;
If the mobile measurement terminal is unknown to work in the receiving and measuring process, all the mobile measurement terminals in the network are started to be in a monitoring state except the mobile measurement terminal which works in the condition generating and transmitting process, and after receiving the information, the mobile measurement terminals are interrupted and reported to the upper computer, and the upper computer informs the other mobile measurement terminals in a broadcasting mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010602480.4A CN113933614B (en) | 2020-06-29 | 2020-06-29 | Distributed virtual network instrument and meter measuring system and method |
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| CN202010602480.4A CN113933614B (en) | 2020-06-29 | 2020-06-29 | Distributed virtual network instrument and meter measuring system and method |
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| CN113933614A CN113933614A (en) | 2022-01-14 |
| CN113933614B true CN113933614B (en) | 2025-08-12 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2854947Y (en) * | 2005-12-20 | 2007-01-03 | 山东信通电器有限公司 | Network tester |
| CN212433301U (en) * | 2020-06-29 | 2021-01-29 | 上海铁路通信有限公司 | Distributed virtual network instrument measuring system |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2332546A (en) * | 1997-12-16 | 1999-06-23 | Atl Monitors Limited | Remote metering |
| CN101122785A (en) * | 2007-09-18 | 2008-02-13 | 韩杰 | Automatic measurement and control device and system |
| CN102854430B (en) * | 2011-06-29 | 2015-01-21 | 上海电缆研究所 | Method and system for testing swinging cross or breaking of multi-core cable |
| CN202374456U (en) * | 2011-12-06 | 2012-08-08 | 北京理工大学 | Security monitoring system based on wireless radio frequency node network detection |
| GB201418003D0 (en) * | 2014-10-10 | 2014-11-26 | Truphone Ltd | System architecture parachute box system HLD |
| CN105486350A (en) * | 2016-01-14 | 2016-04-13 | 南京工业职业技术学院 | Movable farmland environment information monitoring system |
| CN110031720A (en) * | 2019-05-27 | 2019-07-19 | 宋韫犀 | A kind of automatic school line apparatus of modularization based on wireless communication |
| CN110376947B (en) * | 2019-07-26 | 2021-06-22 | 浙江中控技术股份有限公司 | A multi-channel signal switching circuit |
| CN110764026A (en) * | 2019-10-31 | 2020-02-07 | 中铁第四勘察设计院集团有限公司 | Railway signal in-use cable core wire application identification system based on signal source excitation |
-
2020
- 2020-06-29 CN CN202010602480.4A patent/CN113933614B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2854947Y (en) * | 2005-12-20 | 2007-01-03 | 山东信通电器有限公司 | Network tester |
| CN212433301U (en) * | 2020-06-29 | 2021-01-29 | 上海铁路通信有限公司 | Distributed virtual network instrument measuring system |
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