CN113687186B - Portable multi-core cable tester of distributing type - Google Patents
Portable multi-core cable tester of distributing type Download PDFInfo
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- CN113687186B CN113687186B CN202111002780.XA CN202111002780A CN113687186B CN 113687186 B CN113687186 B CN 113687186B CN 202111002780 A CN202111002780 A CN 202111002780A CN 113687186 B CN113687186 B CN 113687186B
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- 238000001514 detection method Methods 0.000 claims abstract description 73
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 230000007175 bidirectional communication Effects 0.000 claims abstract description 9
- 238000009413 insulation Methods 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims description 19
- 230000006854 communication Effects 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 101710179738 6,7-dimethyl-8-ribityllumazine synthase 1 Proteins 0.000 claims description 6
- 101710186608 Lipoyl synthase 1 Proteins 0.000 claims description 6
- 101710137584 Lipoyl synthase 1, chloroplastic Proteins 0.000 claims description 6
- 101710090391 Lipoyl synthase 1, mitochondrial Proteins 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000000739 chaotic effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The distributed portable multi-core cable tester of the invention comprises: the master-slave control module performs bidirectional communication to perform time synchronization calibration operation of the timer; the master-slave control module synchronously controls master-slave circuit selectors according to the internal timer respectively so as to switch and select the circuit to be tested in the multi-core cable; in a resistance measurement mode, a master-slave circuit selector synchronously selects two end ports of the same core wire as two end ports of a circuit to be measured, a detection module measures resistance values in a detection loop, a host control module judges whether the resistance values exceed a set resistance threshold value, and if so, the master control module sends information that the core wire to be measured is likely to have open circuit or poor contact to an upper computer; in the insulation measurement mode, the master-slave circuit selector selects different side ports of two different core wires as two end ports of a circuit to be measured, the detection module measures the current value in the detection loop, the host control module judges whether the current value exceeds a set current threshold value, and if so, the host control module sends information of electric leakage between the two core wires to the upper computer.
Description
Technical Field
The invention relates to a multi-core cable intelligent test device under actual working conditions, and belongs to a special intelligent and rapid detection tool/instrument.
Background
The cable manufacturing enterprises all have desk-top cable comprehensive testers to verify the quality before the cable leaves the factory. Such devices have interfaces at both ends of the cable and are generally cumbersome. In the production process of producing large-scale equipment, cables meeting the requirements of power electricity and signal transmission are tested, and the cables are tested to determine that the actually arranged cables meet the design requirements and can normally work, and a connection diagram and a technical parameter table of the actual working conditions of the cables are generated; accordingly, in the maintenance link of these devices, it is important to detect all cables to check the actual conditions of the cables, determine the corresponding maintenance scheme, or confirm and eliminate various faults. The existing desk type cable tester is convenient to use when the cable leaves a factory or returns to a factory for maintenance, but is difficult to carry when the cable is overhauled in a use field, joints at two ends of the cable on actual equipment are possibly far away, and the two ends of the cable are required to be connected to the testing equipment by using an extension line which is tens of meters or even hundreds of meters long, so that the extension line solution is more troublesome if the connection ends related to the main cable are distributed at different positions.
In application scenes such as large-scale ship, the cable that satisfies power electricity, signal transmission often is that the joint distributes at the cabin cable that is separated by metal splint, is located different floors, traditional based on wireless intercom uses universal tool manual detection's such as universal meter method, needs many people to cooperate, and communication efficiency is low, detects time and energy and often can cause the mistake because of communication problem or personnel operation problem. Especially, in the face of the confusing self-made multi-core cable with interface pins corresponding to the condition, the detection personnel can not directly test according to the pin numbers in a one-to-one correspondence manner, and all the pins are required to be arranged and combined one by one, so that the workload is extremely large. Therefore, the solution of the distributed portable cable tester independent of wireless communication is provided, so that the multi-core cable can be rapidly tested, the intelligent testing of the cable in the application scene can be realized, and the intelligent testing device can be suitable for various complex field testing environments.
Disclosure of Invention
Aiming at the problems and the defects existing in the prior art, the invention provides a novel distributed portable multi-core cable tester.
The invention solves the technical problems by the following technical proposal:
the invention provides a distributed portable multi-core cable tester which is characterized by comprising an upper computer, a host control module, a detection module, a host circuit selector, a host multi-core cable interface, a slave control module, a slave circuit selector and a slave multi-core cable interface, wherein the host circuit selector and the slave circuit selector respectively comprise multiple paths of electronic switching devices, the multiple paths of electronic switching devices are in one-to-one correspondence with core wires of the multi-core cable, the upper computer, the detection module and the host circuit selector are electrically connected with the host control module, the host circuit selector is electrically connected with the detection module and the host multi-core cable interface respectively, and the slave control module, the slave circuit selector and the slave multi-core cable interface are sequentially and electrically connected with each other.
The master control module and the slave control module are used for bidirectional communication to perform time synchronization calibration operation of the timer.
The host control module and the slave control module are used for synchronously controlling the host line selector and the slave line selector respectively according to the internal timer so as to switch and select a line to be detected in the multi-core cable, and the detection module, the host line selector, the host multi-core cable interface, the line to be detected, the slave multi-core cable interface, the slave line selector and the shielding layer of the multi-core cable form a detection loop, or the detection module, the host line selector, the host multi-core cable interface, the line to be detected, the slave multi-core cable interface, the slave line selector, the slave multi-core cable interface and any unselected core wire in the multi-core cable, the host multi-core cable interface and the host line selector form the detection loop.
In the resistance measurement mode, the host circuit selector and the slave circuit selector synchronously select two end ports of the same core wire to be measured as two end ports of the wire to be measured, the detection module is used for measuring the resistance value in the detection loop, the host control module is used for judging whether the resistance value exceeds a set resistance threshold value, and if yes, the host control module sends information that the core wire to be measured is likely to be broken or in poor contact to the upper computer.
In the insulation measurement mode, the host circuit selector and the slave circuit selector select ports on different sides of two different core wires as ports on two ends of a circuit to be measured, the detection module is used for measuring a current value in a detection loop, the host control module is used for judging whether the current value exceeds a set current threshold value, and if yes, information of electric leakage existing between the two core wires is sent to the upper computer.
Preferably, before testing, the master control module and the slave control module are connected through a double-core wire and are used for performing time synchronization initialization calibration operation of a timer through bidirectional communication;
in the test process, the host control module and the slave control module carry out time calibration again according to the set time interval, and when the set time interval is reached, the host line selector and the slave line selector synchronously select the same normally conducted core line in the multi-core cable as a time synchronization communication line of the master-slave machine, so that the time synchronization recalibration operation of the timer is carried out in bidirectional communication.
Preferably, the multi-core cable tester further comprises a high-low voltage switching module, and the high-low voltage switching module is electrically connected with the detection module;
the detection module is used for using a low-voltage measurement power supply or a high-voltage measurement power supply switched by the high-low voltage switching module of the host control module.
Preferably, the host control module adopts a first single chip microcomputer (U20), the detection module comprises a detection chip (U21), a first resistor (R1), a second resistor (R2) and a fifth resistor (R5), and the high-low voltage switching module comprises a high-low voltage switching chip (K102), a third current limiting resistor (R3) and a fourth current limiting resistor (R4).
The first output port of the first singlechip (U20) is electrically connected with the first input port of the detection chip (U21), the first input port of the detection chip (U21) is electrically connected with the positive low-voltage end of the high-low voltage switching chip (K102) through a first resistor (R1), 5V voltage is electrically connected with the first resistor (R1) and a second resistor (R2), the negative low-voltage end of the high-low voltage switching chip (K102) is grounded, the positive high-voltage end is connected with the positive high-voltage VDD through a third resistor (R3), the negative high-voltage end is connected with the negative high-voltage VSS through a fourth resistor (R4), and the negative switching end is electrically connected with the second input port of the detection chip (U21) through a fifth resistor (R5).
When the high-low voltage switching chip (K102) is switched to a low voltage end, the first singlechip (U20) outputs a low-voltage measurement power supply with the first singlechip to a first input port of the detection chip (U21), and when the high-low voltage switching chip (K102) is switched to a high voltage end, high voltage is output to a second input port of the detection chip (U21) through a fifth resistor (R5).
Preferably, the second output port of the first single-chip microcomputer (U20) is electrically connected with the LED lamp (P4) through the sixth resistor (R6), the LED lamp (P4) is grounded, the third output port of the first single-chip microcomputer (U20) is electrically connected with the buzzer (LS 1), and the buzzer (LS 1) is grounded.
Preferably, the high-low voltage switching chip (K102) adopts a relay.
Preferably, the slave control module adopts a second singlechip.
Preferably, the electronic switching device employs a relay.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the invention.
The invention has the positive progress effects that:
1. the multi-core cable tester is of a master-slave machine distributed design, only one cable to be tested is connected between the master machine and the slave machine, a detection loop can still be formed, and the multi-core cable tester is suitable for testing conditions of long distances between two ends of the multi-core cable.
2. The multi-core cable tester automatically switches the testing core wires at high speed through the circuit selector, and after the master-slave machine is initialized and time-matched, the synchronous switching circuit can be realized without communication, so that the complex multi-core cables can be tested rapidly and efficiently.
3. The multi-core cable tester can realize a resistance measurement mode and an insulation measurement mode, can automatically and rapidly traverse pins of the multi-core cable, and establishes a conduction matrix diagram of the multi-core cable to be tested, the structure of which is completely unknown.
4. The multi-core cable to be tested is utilized to realize the synchronization of the master machine and the slave machine in the working process: because the precision of the timer has small difference and the continuous working time is too long, the master-slave machine may have asynchronous phenomenon, thereby affecting the accuracy of conduction detection and the like.
Drawings
FIG. 1 is a schematic diagram of a distributed portable multi-core tester according to a preferred embodiment of the present invention.
FIG. 2 is a schematic diagram of a detection loop in a resistance measurement mode according to a preferred embodiment of the invention.
FIG. 3 is a schematic diagram of a detection circuit in an insulation measurement mode according to a preferred embodiment of the invention.
Fig. 4 is a circuit diagram of a host control module, a detection module and a high-low voltage switching module according to a preferred embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, this embodiment provides a distributed portable multi-core cable tester, which includes a host computer 1, a host control module 2, a detection module 3, a host line selector 4, a host multi-core cable interface 5, a slave control module 6, a slave line selector 7 and a slave multi-core cable interface 8, where the host line selector 4 and the slave line selector 7 each include multiple electronic switching devices (such as a relay or multiple analog switch chips), the multiple electronic switching devices are in one-to-one correspondence with core wires of the multi-core cable 9, the host computer 1, the detection module 3 and the host line selector 4 are all electrically connected with the host control module 2, the host line selector 4 is electrically connected with the detection module 3 and the host multi-core cable interface 5, the slave control module 6, the slave line selector 7 and the slave multi-core cable interface 8 are sequentially electrically connected, and the host multi-core cable interface 5 and the slave multi-core cable interface 8 are used for connecting the multi-core cable 9.
In actual use, before testing, the master and the slave need to be put together to finish initialization setting. The host control module 2 and the slave control module 6 are connected through a double-core wire, and after the time synchronization initialization calibration operation of the timer is completed through bidirectional communication, the double-core wire for time synchronization can be disconnected, and the host control module 2 and the slave control module 6 can be respectively taken to two ends of the multi-core cable for testing.
The master control module 2 and the slave control module 6 are used for synchronously controlling the master line selector 4 and the slave line selector 7 according to the internal timers thereof respectively to switch and select the line to be tested in the multi-core cable 9, and the shielding layers of the detection module 3, the master line selector 4, the master multi-core cable interface 5, the line to be tested, the slave multi-core cable interface 8, the slave line selector 7 and the multi-core cable 9 form a detection loop. If the multi-core cable has no shielding layer or the shielding layer is damaged, the core wires in the multi-core cable can be used, and the detection module 3, the host line selector 4, the host multi-core cable interface 5, the line to be detected, the slave multi-core cable interface 8, the slave line selector 7, any unselected core wire of the slave multi-core cable interface 8 and the multi-core cable 9, the host multi-core cable interface 5 and the host line selector 4 form a detection loop.
As shown in fig. 2, in the resistance measurement mode, the master circuit selector 4 and the slave circuit selector 7 synchronously select two end ports of the same core wire to be measured in the multi-core cable 9 as two end ports of the wire to be measured, the detection module 3 is configured to measure a resistance value in the detection loop 11, and the master control module 2 is configured to determine whether the resistance value exceeds a set resistance threshold, and if yes, send information that the core wire to be measured may have disconnection or poor contact to the upper computer 1.
As shown in fig. 3, in the insulation measurement mode, the master circuit selector 4 and the slave circuit selector 7 select ports on different sides of two different cores in the multi-core cable 9 as two end ports of the to-be-measured circuit, the detection module 3 is configured to measure a current value in the detection loop 12, and the master control module 2 is configured to determine whether the current value exceeds a set current threshold, and if yes, send information that there is leakage between the two cores to the upper computer 1.
In the test process, the line switching between the master machine and the slave machine is required to be highly consistent in time beat, so that an error core line is prevented from being measured, and a high requirement is put on the precision of a timer of the master machine and the slave machine. Even so, after a long period of time, a small time deviation may still occur between the master and slave machines, and the master and slave machines need to be re-clocked. In the design, the time automatic calibration function is integrated in the circuit selector, so that the time automatic calibration function based on the multi-core cable to be tested is increased between the master machine and the slave machine in the test process. In actual operation, after the operator finishes the first initialization time setting, as long as one core wire in the cable to be tested can be normally conducted, the line selector can switch the core wire into a time setting communication line of the master-slave machine, and the system can automatically carry out time calibration again according to a certain time interval in the test process, so that the master-slave machine is always in a high-precision time synchronization state. And when the set time interval is reached, the host line selector and the slave line selector synchronously select the same normally conducted core wire in the multi-core cable as a time synchronization communication wire of the master and slave machines for bidirectional communication to perform time synchronization recalibration operation of the timer.
The multi-core cable tester also comprises a high-low voltage switching module 10 (such as a relay is adopted), and the high-low voltage switching module 10 is electrically connected with the detection module 3; the detection module 10 is configured to use a low-voltage measurement power supply of the host control module 2 or a high-voltage measurement power supply switched by the high-low voltage switching module 10.
As shown in fig. 4, the master control module 2 employs a first single-chip microcomputer (U20), the detection module 3 includes a detection chip (U21), a first resistor (R1), a second resistor (R2) and a fifth resistor (R5), the high-low voltage switching module 10 includes a high-low voltage switching chip (K102), a third current-limiting resistor (R3) and a fourth current-limiting resistor (R4), and the slave control module 6 employs a second single-chip microcomputer.
The first output port of the first singlechip (U20) is electrically connected with the first input port of the detection chip (U21), the first input port of the detection chip (U21) is electrically connected with the positive low-voltage end of the high-low voltage switching chip (K102) through a first resistor (R1), 5V voltage is electrically connected with the first resistor (R1) and a second resistor (R2), the negative low-voltage end of the high-low voltage switching chip (K102) is grounded, the positive high-voltage end is connected with the positive high-voltage VDD through a third resistor (R3), the negative high-voltage end is connected with the negative high-voltage VSS through a fourth resistor (R4), and the negative switching end is electrically connected with the second input port of the detection chip (U21) through a fifth resistor (R5). The second output port of the first singlechip (U20) is electrically connected with the LED lamp (P4) through the sixth resistor (R6), the LED lamp (P4) is grounded, the third output port of the first singlechip (U20) is electrically connected with the buzzer (LS 1), and the buzzer (LS 1) is grounded.
When the high-low voltage switching chip (K102) is switched to a low voltage end, the first singlechip (U20) outputs a low-voltage measurement power supply with the first singlechip to a first input port of the detection chip (U21), and when the high-low voltage switching chip (K102) is switched to a high voltage end, high voltage is output to a second input port of the detection chip (U21) through a fifth resistor (R5).
For self-made multi-core cables with unknown and chaotic corresponding conditions of pins at two ends, based on efficient line switching capacity of a line selector, the tester can also traverse all pin combination conditions rapidly, serial numbers of pins at two ends of the cable forming a passage are recorded, and a conduction matrix diagram of the multi-core cable is established.
In this embodiment, the master-slave confirms that synchronization does not depend on real-time wireless communication: the device replaces real-time wireless communication based on one-time initialization, is more convenient to use and more in applicable scene, and particularly solves the problem that the device based on wireless communication is not suitable for cable detection of a shielded ship.
In the embodiment, the master-slave machine synchronization in the testing process is ensured by utilizing the multi-core cable to be tested, the continuous working time of the equipment is prolonged, and the accuracy of the testing result is ensured: the method and the device are the problems not related to other existing equipment, and effectively solve the problem of long-time synchronization between the master and slave without real-time communication.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (6)
1. The distributed portable multi-core cable tester is characterized by comprising an upper computer, a host control module, a detection module, a host circuit selector, a host multi-core cable interface, a slave control module, a slave circuit selector and a slave multi-core cable interface, wherein the host circuit selector and the slave circuit selector all comprise multi-path electronic switching devices, the multi-path electronic switching devices are in one-to-one correspondence with core wires of the multi-core cable, the upper computer, the detection module and the host circuit selector are all electrically connected with the host control module, the host circuit selector is respectively electrically connected with the detection module and the host multi-core cable interface, and the slave control module, the slave circuit selector and the slave multi-core cable interface are sequentially electrically connected with each other and are used for connecting the multi-core cable;
the master control module and the slave control module are used for bidirectional communication to perform time synchronization calibration operation of the timer;
the host control module and the slave control module are used for synchronously controlling the host line selector and the slave line selector respectively according to the internal timer thereof so as to switch and select a line to be detected in the multi-core cable, and the detection module, the host line selector, the host multi-core cable interface, the line to be detected, the slave multi-core cable interface, the slave line selector and the shielding layer of the multi-core cable form a detection loop, or the detection module, the host line selector, the host multi-core cable interface, the line to be detected, the slave multi-core cable interface, the slave line selector, the slave multi-core cable interface and any unselected core wire in the multi-core cable, the host multi-core cable interface and the host line selector form the detection loop;
in a resistance measurement mode, the host circuit selector and the slave circuit selector synchronously select two end ports of the same core wire to be measured as two end ports of the circuit to be measured, the detection module is used for measuring a resistance value in a detection loop, the host control module is used for judging whether the resistance value exceeds a set resistance threshold value, and if so, the host control module sends information that the core wire to be measured is likely to have open circuit or poor contact to the upper computer;
in an insulation measurement mode, the host circuit selector and the slave circuit selector select ports on different sides of two different core wires as ports on two ends of a circuit to be measured, the detection module is used for measuring a current value in a detection loop, the host control module is used for judging whether the current value exceeds a set current threshold value, and if so, information of electric leakage between the two core wires is sent to the upper computer;
the multi-core cable tester also comprises a high-low voltage switching module, and the high-low voltage switching module is electrically connected with the detection module;
the detection module is used for switching a low-voltage measurement power supply or a high-voltage measurement power supply switched by the high-low voltage switching module of the host control module;
the host control module adopts a first singlechip (U20), the detection module comprises a detection chip (U21), a first resistor (R1), a second resistor (R2) and a fifth resistor (R5), and the high-low voltage switching module comprises a high-low voltage switching chip (K102), a third current-limiting resistor (R3) and a fourth current-limiting resistor (R4);
the first output port of the first singlechip (U20) is electrically connected with the first input port of the detection chip (U21), the first input port of the detection chip (U21) is electrically connected with the positive low-voltage end of the high-low voltage switching chip (K102) through a first resistor (R1), the first resistor (R1) and a second resistor (R2) are also electrically connected with 5V voltage, the negative low-voltage end of the high-low voltage switching chip (K102) is grounded, the positive high-voltage end is connected with positive high-voltage VDD through a third current limiting resistor (R3), the negative high-voltage end is connected with negative high-voltage VSS through a fourth current limiting resistor (R4), and the negative switching end is electrically connected with the second input port of the detection chip (U21) through a fifth resistor (R5);
when the high-low voltage switching chip (K102) is switched to a low voltage end, the first singlechip (U20) outputs a low-voltage measurement power supply with the first singlechip to a first input port of the detection chip (U21), and when the high-low voltage switching chip (K102) is switched to a high voltage end, high voltage is output to a second input port of the detection chip (U21) through a fifth resistor (R5).
2. The distributed portable multi-core cable tester of claim 1, wherein prior to testing, the master control module and the slave control module are connected by a twin-core wire for bidirectional communication for timer time synchronization initialization calibration;
in the test process, the host control module and the slave control module carry out time calibration again according to the set time interval, and when the set time interval is reached, the host line selector and the slave line selector synchronously select the same normally conducted core line in the multi-core cable as a time synchronization communication line of the master-slave machine, so that the time synchronization recalibration operation of the timer is carried out in bidirectional communication.
3. The distributed portable multi-core cable tester according to claim 1, wherein the second output port of the first single-chip microcomputer (U20) is electrically connected to the LED lamp (P4) through a sixth resistor (R6), the LED lamp (P4) is grounded, the third output port of the first single-chip microcomputer (U20) is electrically connected to the buzzer (LS 1), and the buzzer (LS 1) is grounded.
4. The distributed portable multi-core cable tester of claim 1 wherein the high and low voltage switching chip (K102) employs a relay.
5. The distributed portable multi-core cable tester of claim 1 wherein the slave control module employs a second single chip microcomputer.
6. The distributed portable multi-core cable tester of claim 1 wherein the electronic switching device employs a relay.
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