CN211318671U - Ground electronic unit power panel testing arrangement - Google Patents
Ground electronic unit power panel testing arrangement Download PDFInfo
- Publication number
- CN211318671U CN211318671U CN201922354119.XU CN201922354119U CN211318671U CN 211318671 U CN211318671 U CN 211318671U CN 201922354119 U CN201922354119 U CN 201922354119U CN 211318671 U CN211318671 U CN 211318671U
- Authority
- CN
- China
- Prior art keywords
- board
- power
- power supply
- interface
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Train Traffic Observation, Control, And Security (AREA)
Abstract
The utility model provides a ground electronic unit power strip testing arrangement is applied to equipment testing technical field, and the device includes: the power board interfaces communicated with the data processing board, the interface communication board and the output board are plugged, so that a complete LEU complete machine structure is formed, the actual operation environment of the power board to be tested is simulated, and further related test work can be carried out on the power board to be tested. The data processing board, the interface communication board and the output board are repeatedly used, so that an LEU complete machine is prevented from being repeatedly assembled, independent testing of an LEU power supply board is realized, and testing efficiency is improved.
Description
Technical Field
The utility model relates to an equipment testing technical field, in particular to ground electronic unit power strip testing arrangement.
Background
An LEU (line Electronic Unit, ground Electronic Unit) is connected with a train control center device through a serial communication interface, and continuously sends messages from the train control center device to an active transponder, so that variable information is sent to a vehicle-mounted device, and the LEU (line Electronic Unit) is important ground signal equipment in a modern rail train system.
A motherboard is installed in the LEU box body, and a power panel, a data processing panel, an interface communication panel and an output panel are plugged on the motherboard. The existing testing devices are designed for LEU complete machine testing, when a certain template in the LEU complete machine, such as a power panel, needs to be independently tested, the LEU complete machine comprising the power panel to be tested needs to be assembled, and then related testing for the power panel can be carried out, so that the testing efficiency is low.
SUMMERY OF THE UTILITY MODEL
The utility model provides a ground electronic unit power strip testing arrangement does not need the equipment LEU complete machine can realize improving efficiency of software testing to the test of power strip.
In order to achieve the purpose, the technical scheme provided by the application is as follows:
the utility model provides a ground electronic unit power strip testing arrangement, include: a shell, a switching mechanism, a mainboard, a data processing board, an interface communication board and an output board, wherein,
the main board is arranged in the shell and is provided with a data processing board interface, an interface communication board interface, an output board interface and N power supply board interfaces, wherein N is an integer greater than or equal to 1;
the data processing board, the interface communication board and the output board are all plugged in the corresponding interfaces of the main board;
the switching mechanism comprises N power input ends, a power output end and a switch, wherein,
the change-over switch is used for switching the connection state of the power supply output end and each power supply input end, and the power supply output end is communicated with one power supply input end at the same moment;
each power supply input end is connected with the output end of a different power supply board interface;
the power output end is respectively connected with the data processing board interface, the interface communication board interface and the output board interface.
Optionally, the switch includes N switching sub-switches, wherein,
the input end of each switching sub-switch is connected to different power input ends;
the output end of each selector switch is connected with the output end of the power supply;
the switching sub-switch comprises two stations of connection and disconnection.
Optionally, the ground electronic unit power panel testing device provided by the utility model also comprises a testing host, wherein,
the test host is connected with the interface communication board through a test cable.
Optionally, the ground electronic unit power panel testing device provided by the utility model also comprises a power supply, wherein,
the power supply is connected with a power panel to be tested which is plugged in the power panel interface.
Optionally, the power supply is provided with a monitoring circuit for monitoring power supply stability.
Optionally, the power supply is a 24V dc power supply.
Optionally, the switch sub-switch is a button switch.
Optionally, the ground electronic unit power panel testing device provided by the utility model also comprises N status indicating lamps, wherein,
each state indicator lamp is connected in parallel with different switching sub-switches respectively.
The utility model provides a ground electron unit power strip testing arrangement, be provided with the data processing board on the mainboard, interface communication board, the output board, and a N power strip interface, can realize through switching mechanism that can only have a power strip interface and data processing board at the same moment, interface communication board, the output board intercommunication, when with the data processing board, interface communication board, the power strip interface grafting of output board intercommunication has the power strip that awaits measuring, constitute a complete LEU complete machine structure promptly, simulate the actual operational environment of the power strip that awaits measuring, and then can carry out relevant test work to the power strip that awaits measuring. The data processing board, the interface communication board and the output board are repeatedly used, and a temporary LEU complete machine can be formed by selecting the communication states of different power board interfaces, so that repeated assembly of the LEU complete machine is avoided, independent testing of the LEU power boards is realized, and testing efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of a testing apparatus for a power board of a ground electronic unit according to an embodiment of the present invention;
fig. 2 is a schematic perspective view of a testing device for a power board of a ground electronic unit according to an embodiment of the present invention;
fig. 3 is a block diagram of another testing device for a ground electronic unit power board according to an embodiment of the present invention;
fig. 4 is a block diagram illustrating a structure of a testing device for a power board of a ground electronic unit according to an embodiment of the present invention;
fig. 5 is a schematic view of a scene when the testing device for the power board of the ground electronic unit provided by the embodiment of the present invention tests.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
With the continuous improvement of the running speed of the rail train, the requirements of the rail train on safety and high-speed running cannot be met in the aspect of large information processing only by a mode of sending the blocking information to the vehicle-mounted equipment by a rail circuit, so that a large amount of fixed information and variable information are provided for the train-controlled vehicle-mounted equipment by adding the transponder equipment.
An LEU (line Electronic Unit, ground Electronic Unit) is a data acquisition and processing Unit, and is connected with a column control center through a serial communication interface or an interface in other modes, periodically receives real-time changing messages or information sent by the column control center, and continuously sends the messages to an active responder.
To meet the ever-increasing data processing requirements of rail trains, LEUs should have the following basic functions, in particular,
the system can receive the transponder messages sent from the outside and continuously transmit the messages to the transponders, and 1 LEU can simultaneously send 4 different messages to 4 active transponders. The messages sent by the LEU should remain unchanged when the rail train approaches the active transponder.
The LEU can monitor the state of an information channel between the LEU and an active responder in real time and send back to a column control center in time, so that the smoothness of the information channel is ensured, the reliable transmission of related track information is further ensured, and the phenomena of missing transmission, wrong transmission and the like are avoided.
When the LEU fails to communicate with the train control center or the received data is invalid, the LEU should send the stored default message to the active transponder. The messages stored by the LEU (including the default messages) should be able to be inspected by a special test tool. Further, the LEU should be able to detect and process possible random or fixed data errors in time to prevent traffic safety from being compromised, i.e., the LEU is required to have a certain data checking capability and to perform corresponding emergency processing on possible errors.
Furthermore, the LEU must have effective safety measures to ensure timeliness of LEU input and output, and avoid data transmission delay beyond a preset range. And, should possess the corresponding authorization mechanism, before wanting to modify the message that LEU stores, need obtain corresponding authorization at first, otherwise can't carry on any modification to the message that LEU stores.
In order to meet the requirement of large information storage, the message storage type LEU should store at least 256 messages (including 4 default messages), and effective security measures must be provided to ensure that the output messages are correctly selected. For the message receiving type LEU, 4 default messages should be stored, and effective safety measures must be provided to ensure that the output default messages are correctly selected.
In the existing LEU, a power supply board, an output processing board, an interface communication board, and an output board are generally included, and 4 active transponders can be driven.
Based on the above, the LEU is an important ground signal device in a modern rail train system, and before the LEU is put into use or in daily detection, the LEU is subjected to related tests, so that the good performance of the LEU is ensured, and the LEU has important practical significance.
Therefore, the embodiment of the utility model provides a ground electronic unit power strip testing arrangement realizes the independent test to ground electronic unit power strip. Optionally, combine fig. 1 and fig. 2, wherein, fig. 1 is a structural block diagram of a ground electronic unit power strip testing device provided by the embodiment of the present invention, fig. 2 is a three-dimensional structure diagram of a ground electronic unit power strip testing device provided by the embodiment of the present invention, according to the content shown in fig. 1 and fig. 2, the embodiment of the present invention provides a ground electronic unit power strip testing device, including: a housing 70, a switching mechanism 10, a main board 20, a data processing board 30, an interface communication board 40, and an output board 50, wherein,
the housing 70 mainly plays a role in protecting the components such as the switching mechanism 10, the main board 20, the data processing board 30, the interface communication board 40, and the output board 50 placed inside the housing, so as to prevent the components from being damaged by external force during use, or prevent the testing device from being burned out due to short circuit caused by the fact that a tester carelessly drops liquid such as water on the main board 20 and other related electrical components.
It is conceivable that the requirements for the material, the external dimension, and the protection grade of the housing 70 can be performed with reference to the requirements of the related testing device or the entire LEU in the prior art, and the embodiment of the present invention is not specifically limited to this, and the design or the structure that can satisfy the related requirements in the prior art is optional.
The main board 20 is disposed in the housing 70, and the main board 20 is disposed thereon with a data processing board interface, an interface communication board interface, an output board interface, and N power board interfaces (shown as a power board interface 1, a power board interface 2, and a power board interface N in fig. 1; 6 power board interfaces are exemplarily shown in fig. 2), where N is an integer greater than or equal to 1. Specifically, the data processing board 30 is plugged into the data processing board interface, the interface communication board 40 is plugged into the interface communication board interface, and correspondingly, the output board 50 is plugged into the output board interface.
It is conceivable that the selection of the data processing board interface, the interface communication board interface, the output board interface, and the N power board interfaces is performed according to the interface format and the interface specification of the LEU complete machine, which are connected with the data processing board 30, the interface communication board 40, the output board 50, and the power board interfaces, and more importantly, the main board 20 needs to ensure that the data processing board 30, the interface communication board 40, the output board 50, and the power board are plugged into the corresponding interfaces, so that a temporary LEU complete machine can be formed, and that each component can work normally.
The switching mechanism 10 includes N power input terminals, one power output terminal, and a switch (not shown). Specifically, the change-over switch is used to control the connection state of the power output end and each power input end in the switching mechanism 10, and at the same time, the power output end is only communicated with one power input end of the N power input ends. Further, each power input terminal of the switching mechanism 10 is connected to an output terminal of a different power board interface, that is, the power input terminal of the switching mechanism 10 is connected to the output terminal of the power board interface 60 in a one-to-one correspondence.
The power output end of the switching mechanism 10 is connected to the data processing board interface, the interface communication board interface, and the output board interface, respectively, and by the switching mechanism 10, it can be ensured that only one power board interface 60 on the main board 20 is communicated with the data processing board 30, the interface communication board 40, and the output board 50 at the same time, so as to construct a temporary LEU overall machine.
Optionally, the embodiment of the utility model provides a change over switch's optional constitution form, it is concrete, change over switch includes a N change over sub-switch, and each change over sub-switch all includes switches on and breaks off two kinds of stations, and each change over sub-switch's input is connected in the power input end that switching mechanism 10 is different, and simultaneously, each change over sub-switch's output all links to each other with power output end. Based on the change-over switch with the structure, when one of the N change-over sub-switches is in a conducting station, the corresponding connection between the power supply input end and the power supply output end can be realized.
Optionally, the switching sub-switch may be implemented by a button switch, when the button switch is pressed, the button switch is in a conducting state, and the input end and the output end of the switch are communicated; correspondingly, when the button switch is not pressed down, the button switch is in an off state, and the input end and the output end of the switch are disconnected. In the practical use process of the change-over switch realized based on the button switch, a tester can control each change-over sub-switch in the change-over switch in a manual control mode, that is, the on-off of the button switch, so as to realize the connection or the off-off between different power input ends and different power output ends in the switching mechanism 10.
Optionally, the utility model provides a ground electronic unit power strip testing arrangement still includes a N status indicator lamp (not shown in the figure), each status indicator lamp respectively with different switching sub-switch parallel connection, status indicator lamp and switching sub-switch one-to-one set up promptly to be parallel relation with switching sub-switch. Based on the structure, when any one of the switching sub-switches is in a conducting state, the corresponding state indicator lamp is in a working state, namely is lightened. By observing which status indicator light is in the working status, the tester can intuitively determine which power interface board 60 is communicated with the data processing board 30, the interface communication board 40 and the output board 50 through the switching structure 10.
Based on above-mentioned structure and each constitute the relation of connection between the part and know, using the embodiment of the utility model provides a during ground electronic unit power strip testing arrangement, at first need before the test with the power strip that awaits measuring peg graft in the power strip interface that testing arrangement set up, will await measuring simultaneously the power strip and establish with working power supply and be connected, further, will test the host computer and link to each other with interface communication board.
After the connection relation is established, the establishment of a basic test environment is completed, then, a specific test object is selected through a change-over switch, namely, a specific power panel to be tested is selected, the connection relation among the power panel to be tested, the data processing board, the interface communication board and the output board is established through the change-over switch, a temporary LEU complete machine is formed, and finally, test work is carried out through a test host.
Correspondingly, if a plurality of power panels to be tested are inserted on the main board of the testing device, after one power panel to be tested is tested, a tester only needs to disconnect the corresponding switch of the power panel to be tested, and conduct the corresponding switch of the next power panel to be tested, so that the testing work of the next power panel to be tested can be carried out, and the complete machine of the assembly LEU which is repeated for each power panel to be tested is not needed.
To sum up, the embodiment of the utility model provides a ground electron unit power strip testing arrangement is provided with data processing board, interface communication board, output board on the mainboard to and a N power strip interface, can realize through switching mechanism that can only have a power strip interface and data processing board, interface communication board, output board intercommunication at the same moment, when pegging graft with the power strip interface of data processing board, interface communication board, output board intercommunication and have the power strip that awaits measuring, constitute a complete LEU complete machine structure promptly, simulate the actual operational environment of the power strip that awaits measuring, and then can develop relevant test work to the power strip that awaits measuring. The data processing board, the interface communication board and the output board are repeatedly used, and a temporary LEU complete machine can be formed by selecting the communication states of different power board interfaces, so that repeated assembly of the LEU complete machine is avoided, independent testing of the LEU power boards is realized, and testing efficiency is improved.
Optionally, referring to fig. 3, fig. 3 is a block diagram of another testing apparatus for a ground electronic unit power board provided in the embodiment of the present invention, and on the basis of the embodiment shown in fig. 1 and fig. 2, the present invention provides a testing apparatus for a ground electronic unit power board, which further includes a testing host 80.
The test host 80 is connected to the interface communication board 40 on the main board 20 via a test cable. The power panel to be tested is inserted in the power panel interface 60, is connected with a power supply, is communicated with the data processing board 30, the interface communication board 40 and the output board 50 through the switching mechanism 20, and can be tested through the test host 80 after a temporary LEU complete machine is built.
Optionally, to the lectotype of test host computer 80, can select among the prior art any can test the whole machine of LEU, especially can carry out the equipment tested to the LEU power strip, the utility model discloses do not restrict to the concrete lectotype of test host computer.
Through the integrated test host, the test host is directly connected with the interface communication board on the mainboard, and when the power panel to be tested is tested, the step of connecting the test host and the interface communication board can be omitted, so that the test work can be carried out more quickly, and the test efficiency is further improved.
Optionally, referring to fig. 4, fig. 4 is a block diagram of a testing apparatus for a ground electronic unit power board provided in an embodiment of the present invention, and on the basis of the embodiment shown in fig. 3, the testing apparatus for a ground electronic unit provided in an embodiment of the present invention further includes: a power supply 90.
In the actual test process, the power supply 90 is connected to the power board to be tested plugged in the power board interface, and the power board to be tested is connected to the power input end of the switching mechanism 10 through the corresponding output end of the power board interface 60, and further, in order to ensure the normal operation of the power board to be tested, the power supply 90 selects a 24V dc power supply.
Optionally, for improving the power supply stability, a monitoring circuit for monitoring the power supply stability may be further disposed in the power supply 90, the output voltage of the power supply 90 and the input voltage of the power supply 90 are monitored, and when the fluctuation of the input voltage or the output voltage of the power supply 90 exceeds a preset voltage monitoring range, alarm information is sent to a detector. For example, an alarm prompt sound is sent out through a buzzer, or a pre-installed alarm lamp is used for reminding a detector in a light alarm mode, and the like.
Of course, a corresponding emergency protection device may be further disposed in the power supply 90, and the emergency protection device monitors the input voltage, the output current, the working temperature, and the like of the power supply 90 in real time, may have parameters representing the working state of the power supply 90, and determines the working state of the power supply 90 according to a preset corresponding threshold. When one or more of the above parameters exceed the corresponding preset threshold, the power supply 90 may send an alarm signal and, at the same time, stop supplying power urgently, so as to protect the power board to be tested and other connected components.
In the actual test to LEU power strip, need carry out high low temperature test to the power strip, under this kind of condition, can with the utility model provides a testing arrangement places in high low temperature experimental box to the realization is optional to the high low temperature test of the power strip that awaits measuring, and fig. 5 is the utility model provides a scene schematic diagram when ground electronic unit power strip testing arrangement tests, has shown the scene of carrying out high low temperature test to the power strip that awaits measuring promptly. For the connection relationship switching between the test device and the power board to be tested, the above embodiments can be referred to for execution, and details are not described here. For the specific process of the high and low temperature tests, the test process in the prior art can be referred to, and details are not repeated here.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, but also include other elements not expressly listed or inherent to such article or device. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of additional like elements in the article or device comprising the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A ground electronic unit power strip testing arrangement, characterized by, includes: a shell, a switching mechanism, a mainboard, a data processing board, an interface communication board and an output board, wherein,
the main board is arranged in the shell and is provided with a data processing board interface, an interface communication board interface, an output board interface and N power supply board interfaces, wherein N is an integer greater than or equal to 1;
the data processing board, the interface communication board and the output board are all plugged in the corresponding interfaces of the main board;
the switching mechanism comprises N power input ends, a power output end and a switch, wherein,
the change-over switch is used for switching the connection state of the power supply output end and each power supply input end, and the power supply output end is communicated with one power supply input end at the same moment;
each power supply input end is connected with the output end of a different power supply board interface;
the power output end is respectively connected with the data processing board interface, the interface communication board interface and the output board interface.
2. The ground electronics unit power strip testing apparatus of claim 1, wherein the diverter switch comprises N diverter switches, wherein,
the input end of each switching sub-switch is connected to different power input ends;
the output end of each selector switch is connected with the output end of the power supply;
the switching sub-switch comprises two stations of connection and disconnection.
3. The ground electronic unit power strip testing apparatus of claim 1, further comprising a testing host, wherein,
the test host is connected with the interface communication board through a test cable.
4. The ground electronics unit power strip testing apparatus of claim 3, further comprising a power supply, wherein,
the power supply is connected with a power panel to be tested which is plugged in the power panel interface.
5. A ground electronic unit power strip testing device as claimed in claim 4, wherein the power supply is provided with a monitoring circuit for monitoring power supply stability.
6. The ground electronic unit power strip testing apparatus of claim 4, wherein the power supply is a 24V DC power supply.
7. The ground electronics unit power strip test device of claim 2, wherein the diverter switch is a push button switch.
8. The ground electronics unit power strip testing apparatus of claim 2, further comprising N status indicator lights, wherein,
each state indicator lamp is connected in parallel with different switching sub-switches respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922354119.XU CN211318671U (en) | 2019-12-24 | 2019-12-24 | Ground electronic unit power panel testing arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922354119.XU CN211318671U (en) | 2019-12-24 | 2019-12-24 | Ground electronic unit power panel testing arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211318671U true CN211318671U (en) | 2020-08-21 |
Family
ID=72053697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922354119.XU Active CN211318671U (en) | 2019-12-24 | 2019-12-24 | Ground electronic unit power panel testing arrangement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211318671U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325345A (en) * | 2022-01-04 | 2022-04-12 | 上海季丰电子股份有限公司 | Burn-in machine and interface board of burn-in machine |
| CN115877187A (en) * | 2023-02-08 | 2023-03-31 | 北京全路通信信号研究设计院集团有限公司 | Testing device and method for ground electronic unit |
-
2019
- 2019-12-24 CN CN201922354119.XU patent/CN211318671U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325345A (en) * | 2022-01-04 | 2022-04-12 | 上海季丰电子股份有限公司 | Burn-in machine and interface board of burn-in machine |
| CN114325345B (en) * | 2022-01-04 | 2023-12-15 | 上海季丰电子股份有限公司 | Burn-in machine and interface board for burn-in machine |
| CN115877187A (en) * | 2023-02-08 | 2023-03-31 | 北京全路通信信号研究设计院集团有限公司 | Testing device and method for ground electronic unit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211318671U (en) | Ground electronic unit power panel testing arrangement | |
| CN203951485U (en) | Universal port and cable tester | |
| US10514411B2 (en) | Testing system for multiple-unit locomotives | |
| CN112147497A (en) | Intelligent switch testing device and method | |
| CN203479951U (en) | Channel switching testing device | |
| CN212031662U (en) | ZPW2000A track circuit test verification platform | |
| CN210835198U (en) | Cable checking device | |
| JPS62207033A (en) | Power line carrier communication equipment | |
| CN108445319A (en) | A kind of fault detect tool for solenoid valve | |
| CN214375203U (en) | Wire test equipment and test device | |
| CA1250034A (en) | Portable testing device for monitoring communication line activity | |
| CN209640434U (en) | A kind of equipment for the vehicle-mounted school VOBC line | |
| CN108037401A (en) | A kind of power cable fault tests system | |
| CN112180896A (en) | OBD test auxiliary device, tester and test equipment | |
| CN105044552A (en) | Fault diagnosis method, system and device for distribution network automation system | |
| CN217931829U (en) | Detection system | |
| CN110943891A (en) | Detection apparatus for be used for switch port broadcast storm | |
| CN220671844U (en) | Intelligent controller for combustible gas alarm of energy adding station | |
| CN220983761U (en) | Device for selecting HIL engineering | |
| CN110632876A (en) | 24V power supply safety wireless monitoring system and method | |
| CN215813280U (en) | Process LRU and aircraft whole-aircraft cable testing system | |
| CN215263886U (en) | Dial switch testing device | |
| CN214412820U (en) | Multifunctional telephone network testing device | |
| CN213152055U (en) | Optical block remote switching device | |
| CN211318519U (en) | Be applied to detecting instrument of 2M cable investigation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |