A coaxial shielded cable status detection circuit and apparatus

Abstract

The application discloses a coaxial shielded cable state detection circuit and equipment, and relates to the technical field of cable detection.The circuit comprises: at least one cable interface, each cable interface comprising a first interface for providing a coaxial shielded cable core wire access position and a second interface for providing a coaxial shielded cable metal shielding layer access position; an open circuit detection circuit, a short circuit detection circuit and a power supply, the open circuit detection circuit and the short circuit detection circuit being arranged in parallel, the open circuit detection circuit being provided with an open circuit indication branch arranged in parallel with the first interface and an open circuit signal transmission branch, the short circuit detection circuit being provided with a short circuit indication branch arranged in parallel with the second interface and a short circuit signal transmission branch; and a total indication circuit comprising a total open circuit indication branch and a total short circuit indication branch.The application can quickly and accurately measure whether a coaxial shielded cable has an open circuit, a short circuit and other fault states, and can display correct detection results.

Description

Technical Field

[0001] This invention relates to the field of cable testing technology, and specifically to a detection circuit and device for the condition of coaxial shielded cables. Background Technology

[0002] Shielded cables are an important physical medium for signal transmission between electrical devices. The correctness of the shielded cable connection directly affects whether the related electrical devices can operate stably, reliably, and safely.

[0003] Currently, the inspection process for shielded cables after production mostly relies on manual testing using a multimeter to determine continuity. This manual method is labor-intensive, inefficient, and unreliable. Furthermore, the tedious testing process is prone to errors, making it impossible to guarantee the quality of the tested shielded cables. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a detection circuit and device for the status of coaxial shielded cables, thereby solving the problems of high workload, low efficiency and poor reliability in the prior art of manually detecting the status of shielded cables.

[0005] According to a first aspect, embodiments of the present invention provide a detection circuit for the state of a coaxial shielded cable, comprising:

[0006] At least one cable interface, each cable interface including a first interface for providing a coaxial shielded cable core wire access position and a second interface for providing a coaxial shielded cable metal shield layer access position, the first interface and the second interface are coaxially arranged and the first interface is located inside the second interface, and the first interface and the second interface are short-circuited when short-circuited;

[0007] An open-circuit detection circuit electrically connected to the first interface, a short-circuit detection circuit electrically connected to the second interface, and a power supply are provided. The open-circuit detection circuit and the short-circuit detection circuit are arranged in parallel. The open-circuit detection circuit has an open-circuit indicator branch arranged in parallel with the first interface and an open-circuit signal transmission branch electrically connected to the open-circuit indicator branch through an open-circuit guide. The short-circuit detection circuit has a short-circuit indicator branch arranged in parallel with the second interface and a short-circuit signal transmission branch electrically connected to the short-circuit indicator branch through a short-circuit guide. The power supply is electrically connected to the first interface, the open-circuit indicator branch, and the short-circuit indicator branch.

[0008] The main indicator circuit includes a main open-circuit indicator branch electrically connected to all open-circuit signal transmission signals and a main short-circuit indicator branch electrically connected to all short-circuit signal transmission signals;

[0009] When the cable to be tested is inserted into the cable interface, if the cable to be tested is normal, the power supply is electrically connected to the core wire through the corresponding first interface; if the core wire of the cable to be tested has an open circuit fault, the power supply is electrically connected to the corresponding open circuit detection circuit, and electrically connected to the main open circuit indicator branch through the open circuit guide; if there is a short circuit fault between the core wire and the metal shielding layer of the cable to be tested, the power supply is electrically connected to the metal shielding layer through the corresponding short circuit detection circuit and the corresponding second interface, and electrically connected to the main short circuit indicator branch through the short circuit guide.

[0010] In conjunction with the first aspect, in the first embodiment of the first aspect, the power supply is electrically connected to one end of the first interface, and the other end of the first interface is grounded through a fourth resistor.

[0011] In conjunction with the first embodiment of the first aspect, in the fourth embodiment of the second aspect, an indicator is provided on the open circuit indicator branch, the main open circuit indicator branch, the short circuit indicator branch, and the main short circuit indicator branch. The indicator is used to indicate the fault status.

[0012] In conjunction with the second embodiment of the first aspect, in the third embodiment of the first aspect, the open-circuit detection circuit includes a fifth resistor, a first optocoupler serving as an open-circuit guide, a second resistor, and a branch open-circuit indicator. One end of the fifth resistor is electrically connected to the power supply, and the other end of the fifth resistor is electrically connected to the input terminal of the light source in the first optocoupler. The output terminal of the light source in the first optocoupler is electrically connected to the main open-circuit indicator branch. The power supply is electrically connected to one end of the second resistor, and the other end of the second resistor is electrically connected to one end of the photodetector in the first optocoupler. The other end of the photodetector in the first optocoupler is electrically connected to one end of the branch open-circuit indicator. The other end of the branch open-circuit indicator is grounded through the fourth resistor. The second resistor, the photodetector in the first optocoupler, and the branch open-circuit indicator are connected in series and arranged in parallel with the first interface.

[0013] In conjunction with the third embodiment of the first aspect, in the fourth embodiment of the first aspect, the main open circuit indicator branch includes a main open circuit indicator and a seventh resistor. One end of the main open circuit indicator is electrically connected to the output terminal of the light source in the first optocoupler, and the other end of the main open circuit indicator is electrically connected to the seventh resistor, and the other end of the seventh resistor is grounded.

[0014] In conjunction with the second embodiment of the first aspect, in the fifth embodiment of the first aspect, the short-circuit detection circuit includes a sixth resistor, a second optocoupler serving as a short-circuit guide, a third resistor, and a branch short-circuit indicator. One end of the sixth resistor is electrically connected to the power supply, and the other end of the sixth resistor is electrically connected to the input terminal of the light source in the second optocoupler. The output terminal of the light source in the second optocoupler is electrically connected to the main short-circuit indicator branch. The power supply is electrically connected to one end of the third resistor, and the other end of the third resistor is electrically connected to one end of the photodetector in the second optocoupler. The other end of the photodetector in the second optocoupler is electrically connected to one end of the branch short-circuit indicator, and the other end of the branch short-circuit indicator is electrically connected to the second interface.

[0015] In conjunction with the fifth embodiment of the first aspect, in the sixth embodiment of the first aspect, the total short-circuit indicator branch includes a total short-circuit indicator and an eighth resistor. One end of the total short-circuit indicator is electrically connected to the output terminal of the light source in the second optocoupler, and the other end of the total short-circuit indicator is electrically connected to the eighth resistor, and the other end of the eighth resistor is grounded.

[0016] In conjunction with the third embodiment of the first aspect, in the seventh embodiment of the first aspect, a first resistor and an insertion indicator are provided on the connection line between the power supply and the second resistor and the first interface. One end of the power supply is electrically connected to the first resistor, the other end of the first resistor is electrically connected to one end of the insertion indicator, and the other end of the insertion indicator is electrically connected to the second resistor and the first interface.

[0017] According to a second aspect, embodiments of the present invention also provide a detection device for the status of a coaxial shielded cable, the device comprising a housing and a detection circuit for the status of the coaxial shielded cable as described in any of the preceding claims.

[0018] In conjunction with the second aspect, in the first embodiment of the second aspect, the first interface and the second interface of the same cable interface are set separately. When testing the coaxial shielded cable, one end of the cable to be tested is inserted into the first interface and the other end of the cable to be tested is inserted into the second interface corresponding to the same cable interface.

[0019] The coaxial shielded cable status detection circuit and device of the present invention comprises an open-circuit detection circuit electrically connected to a first interface, a short-circuit detection circuit electrically connected to a second interface, and a power supply. The open-circuit detection circuit and the short-circuit detection circuit are arranged in parallel. The open-circuit detection circuit has an open-circuit indicator branch arranged in parallel with the first interface and an open-circuit signal transmission branch electrically connected to the open-circuit indicator branch through an open-circuit guide. The short-circuit detection circuit has a short-circuit indicator branch arranged in parallel with the second interface and a short-circuit signal transmission branch electrically connected to the short-circuit indicator branch through a short-circuit guide. The power supply is electrically connected to the first interface, the open-circuit indicator branch, and the short-circuit indicator branch. The system includes a main open-circuit indicator branch electrically connected to all open-circuit signal transmission signals and a main short-circuit indicator branch electrically connected to all short-circuit signal transmission signals. Addressing the low reliability and efficiency of manual testing methods, this system can readily determine the continuity of coaxial shielded cable cores and whether the external metal shielding layer is short-circuited. The number of coaxial shielded cables that can be tested simultaneously is significantly increased, greatly improving efficiency and enhancing testing reliability. It can quickly and accurately measure whether coaxial shielded cables have open-circuit, short-circuit, or other fault conditions, and displays the correct test results through the corresponding detection circuit / main indicator circuit. Attached Figure Description

[0020] The features and advantages of the invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the invention in any way. In the drawings:

[0021] Figure 1 One of the structural schematic diagrams of the coaxial shielded cable status detection circuit provided by the present invention is shown;

[0022] Figure 2 The second schematic diagram shows the structure of the detection circuit for the status of the coaxial shielded cable provided by the present invention;

[0023] Figure 3 A schematic diagram of the optocoupler used in the detection circuit for the status of the coaxial shielded cable provided by the present invention is shown.

[0024] Figure 4 A schematic diagram of the structure of the coaxial shielded cable condition detection device provided by the present invention is shown. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Shielded cable harnesses consist of multiple shielded cables, which are transmission lines that use a metal mesh braid to wrap the signal core wires. Shielded cables are an important physical medium for signal transmission between electrical devices, and the correctness of the shielded cable connection directly affects whether the related electrical devices can operate stably, reliably, and safely.

[0027] Currently, the inspection process for shielded cables after production largely relies on manual testing using a multimeter to determine continuity. This involves workers setting the multimeter to resistance mode, placing the probes at both ends of the cable, and visually inspecting the resistance reading to determine if the core wires are connected or if the metal shielding layer is short-circuited. However, this manual testing method is labor-intensive, inefficient, and unreliable. The tedious process is prone to errors, making it difficult to guarantee the quality of the shielded cables being tested.

[0028] To address the aforementioned issues, this embodiment provides a detection circuit for the condition of coaxial shielded cables, aiming to significantly improve the efficiency and reliability of coaxial shielded cable condition testing at a low cost. Figure 1 This is a circuit diagram of a detection circuit for the state of a coaxial shielded cable according to an embodiment of the present invention. It should be noted that a coaxial shielded cable is a special type of shielded cable, generally composed of four layers of material, including an innermost conductive copper core wire (core wire) and a thin mesh conductive layer (metal shielding layer), and the core wire and the metal shielding layer are coaxially arranged. Figure 1 As shown, the detection circuit specifically includes:

[0029] At least one cable interface 10, in the embodiments of the invention, each cable interface 10 includes a first interface 11 for providing a coaxial shielded cable core wire access position and a second interface 12 for providing a coaxial shielded cable metal shielding layer access position. The first interface 11 and the second interface 12 are coaxially arranged and the first interface 11 is located inside the second interface 12. The first interface 11 and the second interface 12 are short-circuited when short-circuited.

[0030] An open-circuit detection circuit electrically connected to the first interface 11, a short-circuit detection circuit electrically connected to the second interface 12, and a power supply are provided. The open-circuit detection circuit and the short-circuit detection circuit are arranged in parallel. The open-circuit detection circuit has an open-circuit indicator branch arranged in parallel with the first interface 11 and an open-circuit signal transmission branch electrically connected to the open-circuit indicator branch through an open-circuit guide. The short-circuit detection circuit has a short-circuit indicator branch arranged in parallel with the second interface 12 and a short-circuit signal transmission branch electrically connected to the short-circuit indicator branch through a short-circuit guide. The power supply is electrically connected to the first interface 11, the open-circuit indicator branch, and the short-circuit indicator branch.

[0031] Preferably, the power supply uses 12V DC voltage to provide the basic operating voltage for the entire circuit.

[0032] In the embodiments of the invention, the main indicator circuit includes a main open-circuit indicator branch electrically connected to all open-circuit signal transmission signals and a main short-circuit indicator branch electrically connected to all short-circuit signal transmission signals.

[0033] When the cable under test is inserted into cable interface 11, if the cable is normal, the power supply is electrically connected to the core wire through the corresponding first interface 11. At this time, the open circuit detection circuit and the short circuit indicator branch are not conductive, and the detection circuit can indicate that the cable under test is in a normal state. If the core wire of the cable under test has an open circuit fault, the power supply is electrically connected to the corresponding open circuit detection circuit and electrically connected to the main open circuit indicator branch through the open circuit guide. At this time, the open circuit indicator branch in the open circuit indicator branch and the open circuit signal transmission branch electrically connected to the open circuit indicator branch through the open circuit guide are both conductive, and the main open circuit indicator branch is also conductive. If the cable under test is open, the detection circuit will be activated, indicating that the core wire of the cable under test is open. If there is a short circuit between the core wire and the metal shielding layer of the cable under test, the power supply will be electrically connected to the metal shielding layer through the corresponding short circuit detection circuit and the corresponding second interface 12, and electrically connected to the main short circuit indicator branch through the short circuit guide. At this time, the short circuit indicator branch in the short circuit indicator branch and the short circuit signal transmission branch electrically connected to the short circuit indicator branch through the short circuit guide will be activated, and the main short circuit indicator branch will also be activated. The detection circuit will then indicate that there is a short circuit between the core wire and the metal shielding layer of the cable under test.

[0034] It is understood that the cable under test is a coaxial shielded cable. Since the detection circuit has at least one cable interface 10, it can detect multiple coaxial shielded cables simultaneously. The open / short circuit indicator branch is activated to indicate that the cable under test inserted into the corresponding cable interface 10 has an open / short circuit fault, while the overall open / short circuit indicator branch is used to indicate the cable under test that has an open / short circuit fault.

[0035] In this embodiment of the invention, an indicator is provided on the open circuit indicator branch, the main open circuit indicator branch, the short circuit indicator branch, and the main short circuit indicator branch. The indicator is used to indicate the fault status. Specifically, the indicator on the open circuit indicator branch and the main open circuit indicator branch is used to indicate that there is an open circuit fault in the core wire, and the indicator on the short circuit indicator branch and the main short circuit indicator branch is used to indicate that there is a short circuit fault between the core wire and the metal shielding layer.

[0036] Preferably, the indicator uses light-emitting diodes (LEDs). When the corresponding line is connected due to a fault, the LED will generate light to indicate the status. Each LED has a specific meaning, so the user can know the status of the cable under test (normal, open circuit in the core wire, or short circuit between the core wire and the metal shielding layer).

[0037] The coaxial shielded cable status detection circuit provided by this invention comprises an open-circuit detection circuit electrically connected to a first interface 11, a short-circuit detection circuit electrically connected to a second interface 12, and a power supply. The open-circuit detection circuit and the short-circuit detection circuit are connected in parallel. The open-circuit detection circuit includes an open-circuit indicator branch connected in parallel with the first interface 11 and an open-circuit signal transmission branch electrically connected to the open-circuit indicator branch via an open-circuit guide. The short-circuit detection circuit includes a short-circuit indicator branch connected in parallel with the second interface 12 and a short-circuit signal transmission branch electrically connected to the short-circuit indicator branch via a short-circuit guide. The power supply is connected to the first interface 11, the open-circuit indicator branch, and the short-circuit indicator branch. The branch electrical connection, as well as the main open-circuit indicator branch electrically connected to all open-circuit signal transmission signals and the main short-circuit indicator branch electrically connected to all short-circuit signal transmission signals, address the shortcomings of low reliability and low work efficiency of manual detection methods. It can clearly determine the continuity of the core wires of the coaxial shielded cable and whether the external metal shielding layer is short-circuited. The number of coaxial shielded cables that can be tested simultaneously is also significantly increased, greatly improving work efficiency and enhancing test reliability. It can quickly and accurately measure whether there are open-circuit, short-circuit, or other fault states in the coaxial shielded cable, and display the correct test results through the corresponding detection circuit / main indicator circuit.

[0038] For details, please refer to Figure 2 , Figure 2 The diagram shows the specific circuit structure of one of the cable interfaces 10, and explains the process of detecting the status of a cable to be tested. By analogy, the specific circuit structure of the detection circuit can be obtained when there are several cable interfaces 10.

[0039] In this embodiment of the invention, the power supply is electrically connected to one end of the first interface 11, and the other end of the second interface 11 is connected to a fourth resistor (such as...). Figure 2 Resistor 4) is grounded, and the fourth resistor plays the role of current limiting protection.

[0040] The open-circuit detection circuit includes a fifth resistor (such as...) Figure 2 The resistor 5 in the middle), the first optocoupler (such as...) Figure 2 The optocoupler 1) and the second resistor (e.g.) Figure 2 The fifth resistor (2) and the branch open circuit indicator (open circuit indicator 1 in the figure) are connected in series. One end of the fifth resistor is electrically connected to the power supply, and the other end of the fifth resistor is electrically connected to the input end of the light source in the first optocoupler. The output end (Open1) of the light source in the first optocoupler is electrically connected to the main open circuit indicator branch. The power supply is electrically connected to one end of the second resistor. The other end of the second resistor is electrically connected to one end of the light receiver in the first optocoupler. The other end of the light receiver in the first optocoupler is electrically connected to one end of the branch open circuit indicator. The other end of the branch open circuit indicator is grounded through the fourth resistor. The second resistor, the light receiver in the first optocoupler and the branch open circuit indicator are connected in series and set in parallel with the first interface. That is, the second resistor, the first optocoupler and the branch open circuit indicator form a branch connected in series with the first interface 11.

[0041] The main open circuit indicator branch includes the main open circuit indicator (such as...) Figure 2 The main open circuit indicator light and the seventh resistor (as shown) Figure 2 As shown in resistor 7), one end of the main open circuit indicator is electrically connected to the output terminal (Open1) of the light source in the first optocoupler, and the other end of the main open circuit indicator is electrically connected to the seventh resistor. The other end of the seventh resistor is grounded. The second resistor, the fifth resistor, and the seventh resistor also serve as current limiting protection.

[0042] The short-circuit detection circuit includes a sixth resistor (e.g., Figure 2 Resistor 6 shown), second optocoupler (as shown) Figure 2 The optocoupler 2 and the third resistor (as shown) are shown. Figure 2 Resistor 3) and branch short-circuit indicator (e.g.) Figure 2 As shown in the short-circuit indicator 1), one end of the sixth resistor is electrically connected to the power supply, and the other end of the sixth resistor is electrically connected to the input terminal of the light source in the second optocoupler. The output terminal (Short1) of the light source in the second optocoupler is electrically connected to the main short-circuit indicator branch. The power supply is electrically connected to one end of the third resistor, and the other end of the third resistor is electrically connected to one end of the light receiver in the second optocoupler. The other end of the light receiver in the second optocoupler is electrically connected to one end of the branch short-circuit indicator, and the other end of the branch short-circuit indicator is electrically connected to the second interface.

[0043] The main short-circuit indicator branch includes the main short-circuit indicator (such as...). Figure 2 The main short-circuit indicator light and the eighth resistor (as shown) Figure 2As shown in resistor 8), one end of the total short-circuit indicator is electrically connected to the output terminal (Short1) of the light source in the second optocoupler, and the other end of the total short-circuit indicator is electrically connected to the eighth resistor. The other end of the eighth resistor is grounded. The third, sixth, and eighth resistors also serve as current limiting protection.

[0044] In this embodiment of the invention, a first resistor (e.g., ...) is provided on the connection line between the power supply and the second resistor and the first interface. Figure 2 Resistor 1) and insertion indicator (as shown) Figure 2 The light-emitting diode 1 shown has one end of its power supply electrically connected to the first resistor, the other end of the first resistor electrically connected to one end of the insertion indicator, and the other end of the insertion indicator electrically connected to the second resistor and the first interface. The insertion indicator is used to indicate that the cable to be tested is inserted into the corresponding cable interface 10.

[0045] The anode of the branch open circuit indicator is electrically connected to the output terminal of the photodetector of the first optocoupler; the anode of the insertion indicator is electrically connected to the end of the first resistor furthest from the power supply; the anode of the branch short circuit indicator is electrically connected to the output terminal of the photodetector of the second optocoupler; the anode of the main open circuit indicator is electrically connected to the output terminal of the light source of the first optocoupler; and the anode of the main short circuit indicator is electrically connected to the output terminal of the light source of the second optocoupler.

[0046] Preferably, the resistor used in this embodiment of the invention can be 680 ohms.

[0047] Please see Figure 3 Both the first and second optocouplers include a light source (e.g., a light-emitting diode) and a light receiver (e.g., a phototransistor). When the light source in the optocoupler is turned on, the photo receiver is also turned on, thereby turning on the indicator connected to it.

[0048] The specific testing process is as follows: Place the cable to be tested into cable interface 10; its internal core wires and external metal shielding layer will be as shown in the diagram. Figure 2 connect;

[0049] After the power supply is turned on, if the cable under test is normal and not open / short-circuited, the indicator will light up when inserted, while other indicators will not light up.

[0050] If there is an open circuit fault in the core wire of the cable under test, the first interface 11 will be disconnected. The open circuit indicator branch and the open circuit signal transmission branch electrically connected to the open circuit indicator branch through the open circuit guide will be turned on. The insertion indicator and the branch open circuit indicator will be turned on and illuminated. At the same time, the first optocoupler will be turned on and the Open1 circuit will generate current, causing the main open circuit indicator to illuminate.

[0051] If there is a short circuit fault between the core wire and the metal shielding layer of the cable under test, the first interface 11 and the second interface 12 are shorted. The short circuit indicator branch and the short circuit signal transmission branch electrically connected to the short circuit indicator branch through the short circuit guide will be turned on. The insertion indicator and the short circuit open circuit indicator will be turned on and illuminated. At the same time, the second optocoupler is turned on and current is generated in the Short1 circuit, causing the main short circuit indicator to illuminate.

[0052] Open1, Open2, or Short1, Short2, etc., are designed in parallel to represent the open / short circuit status of the first, second, etc. cables in the harness, respectively. The number of test circuits can be designed according to the number of shielded wires in the harness. As long as one cable has an open circuit or short circuit fault, the total open / short circuit indicator will light up.

[0053] To address the aforementioned issues, this embodiment provides a device for detecting the condition of coaxial shielded cables, aiming to significantly improve the efficiency and reliability of coaxial shielded cable condition testing at a low cost. Figure 4 This is a schematic diagram of the structure of a detection circuit for the state of a coaxial shielded cable according to an embodiment of the present invention. It should be noted that a coaxial shielded cable is a special type of shielded cable, generally composed of four layers of material, including an innermost conductive copper core wire (core wire) and a thin mesh conductive layer (metal shielding layer), and the core wire and the metal shielding layer are coaxially arranged. Figure 1 As shown, the testing equipment specifically includes:

[0054] The outer casing, and the components disposed within the outer casing, such as Figure 1 , Figure 2 The circuit shown is for detecting the status of the coaxial shielded cable.

[0055] Please see Figure 3 When there are several cable interfaces 10 in the testing device, each cable interface 10 includes a first interface 11 and a second interface 12. The two interfaces are separated, that is, the first interface 11 is used to connect one end of the cable to be tested, and the second interface 12 is used to connect the other end of the cable to be tested.

[0056] The coaxial shielded cable status detection device provided by this invention comprises an open-circuit detection circuit electrically connected to a first interface 11, a short-circuit detection circuit electrically connected to a second interface 12, and a power supply. The open-circuit detection circuit and the short-circuit detection circuit are connected in parallel. The open-circuit detection circuit includes an open-circuit indicator branch connected in parallel with the first interface 11 and an open-circuit signal transmission branch electrically connected to the open-circuit indicator branch via an open-circuit guide. The short-circuit detection circuit includes a short-circuit indicator branch connected in parallel with the second interface 12 and a short-circuit signal transmission branch electrically connected to the short-circuit indicator branch via a short-circuit guide. The power supply is connected to the first interface 11, the open-circuit indicator branch, and the short-circuit indicator branch. The branch electrical connection, as well as the main open-circuit indicator branch electrically connected to all open-circuit signal transmission signals and the main short-circuit indicator branch electrically connected to all short-circuit signal transmission signals, address the shortcomings of low reliability and low work efficiency of manual detection methods. It can clearly determine the continuity of the core wires of the coaxial shielded cable and whether the external metal shielding layer is short-circuited. The number of coaxial shielded cables that can be tested simultaneously is also significantly increased, greatly improving work efficiency and enhancing test reliability. It can quickly and accurately measure whether there are open-circuit, short-circuit, or other fault states in the coaxial shielded cable, and display the correct test results through the corresponding detection circuit / main indicator circuit.

[0057] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of software media. This computer software media can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several commands to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A detection circuit for the status of a coaxial shielded cable, characterized in that, include: At least one cable interface, each cable interface including a first interface for providing a coaxial shielded cable core wire access position and a second interface for providing a coaxial shielded cable metal shield layer access position, the first interface and the second interface are coaxially arranged and the first interface is located inside the second interface, and the first interface and the second interface are short-circuited when short-circuited; An open-circuit detection circuit electrically connected to the first interface, a short-circuit detection circuit electrically connected to the second interface, and a power supply are provided. The open-circuit detection circuit and the short-circuit detection circuit are arranged in parallel. The open-circuit detection circuit has an open-circuit indicator branch arranged in parallel with the first interface and an open-circuit signal transmission branch electrically connected to the open-circuit indicator branch through an open-circuit guide. The short-circuit detection circuit has a short-circuit indicator branch arranged in parallel with the second interface and a short-circuit signal transmission branch electrically connected to the short-circuit indicator branch through a short-circuit guide. The power supply is electrically connected to the first interface, the open-circuit indicator branch, and the short-circuit indicator branch. The main indicator circuit includes a main open-circuit indicator branch electrically connected to all open-circuit signal transmission signals and a main short-circuit indicator branch electrically connected to all short-circuit signal transmission signals; When the cable to be tested is inserted into the cable interface, if the cable to be tested is normal, the power supply is electrically connected to the core wire through the corresponding first interface; if there is an open circuit fault in the core wire of the cable to be tested, the power supply is electrically connected to the corresponding open circuit detection circuit, and electrically connected to the main open circuit indicator branch through the open circuit guide; if there is a short circuit fault between the core wire and the metal shielding layer of the cable to be tested, the power supply is electrically connected to the metal shielding layer through the corresponding short circuit detection circuit and the corresponding second interface, and electrically connected to the main short circuit indicator branch through the short circuit guide. The first and second interfaces of the same cable interface are set separately. When testing coaxial shielded cables, one end of the cable to be tested is inserted into the first interface and the other end of the cable to be tested is inserted into the second interface corresponding to the same cable interface.

2. The detection circuit for the status of coaxial shielded cable according to claim 1, characterized in that, The power supply is electrically connected to one end of the first interface, and the other end of the first interface is grounded through the fourth resistor.

3. The detection circuit for the status of coaxial shielded cable according to claim 2, characterized in that, Indicators are provided on the open circuit indicator branch, the main open circuit indicator branch, the short circuit indicator branch, and the main short circuit indicator branch. The indicators are used to indicate the fault status.

4. The detection circuit for the status of coaxial shielded cable according to claim 3, characterized in that, The open-circuit detection circuit includes a fifth resistor, a first optocoupler serving as an open-circuit guide, a second resistor, and a branch open-circuit indicator. One end of the fifth resistor is electrically connected to the power supply, and the other end of the fifth resistor is electrically connected to the input terminal of the light source in the first optocoupler. The output terminal of the light source in the first optocoupler is electrically connected to the main open-circuit indicator branch. The power supply is electrically connected to one end of the second resistor, and the other end of the second resistor is electrically connected to one end of the light receiver in the first optocoupler. The other end of the light receiver in the first optocoupler is electrically connected to one end of the branch open-circuit indicator. The other end of the branch open-circuit indicator is grounded through the fourth resistor. The second resistor, the light receiver in the first optocoupler, and the branch open-circuit indicator are connected in series and arranged in parallel with the first interface.

5. The detection circuit for the status of coaxial shielded cable according to claim 4, characterized in that, The main open circuit indicator branch includes a main open circuit indicator and a seventh resistor. One end of the main open circuit indicator is electrically connected to the output terminal of the light source in the first optocoupler, and the other end of the main open circuit indicator is electrically connected to the seventh resistor, the other end of which is grounded.

6. The detection circuit for the status of coaxial shielded cable according to claim 3, characterized in that, The short-circuit detection circuit includes a sixth resistor, a second optocoupler serving as a short-circuit guide, a third resistor, and a branch short-circuit indicator. One end of the sixth resistor is electrically connected to the power supply, and the other end of the sixth resistor is electrically connected to the input terminal of the light source in the second optocoupler. The output terminal of the light source in the second optocoupler is electrically connected to the main short-circuit indicator branch. The power supply is electrically connected to one end of the third resistor, and the other end of the third resistor is electrically connected to one end of the photodetector in the second optocoupler. The other end of the photodetector in the second optocoupler is electrically connected to one end of the branch short-circuit indicator, and the other end of the branch short-circuit indicator is electrically connected to the second interface.

7. The detection circuit for the status of coaxial shielded cable according to claim 6, characterized in that, The total short-circuit indicator branch includes a total short-circuit indicator and an eighth resistor. One end of the total short-circuit indicator is electrically connected to the output terminal of the light source in the second optocoupler, and the other end of the total short-circuit indicator is electrically connected to the eighth resistor, the other end of which is grounded.

8. The detection circuit for the status of coaxial shielded cable according to claim 4, characterized in that, The connection line between the power supply and the second resistor and the first interface is provided with a first resistor and an insertion indicator. One end of the power supply is electrically connected to the first resistor, the other end of the first resistor is electrically connected to one end of the insertion indicator, and the other end of the insertion indicator is electrically connected to the second resistor and the first interface.

9. A device for detecting the condition of a coaxial shielded cable, characterized in that, The device includes a housing and a detection circuit for the status of the coaxial shielded cable as described in any one of claims 1-7.

10. The detection device for the condition of coaxial shielded cables according to claim 9, characterized in that, The first and second interfaces of the same cable interface are set separately. When testing coaxial shielded cables, one end of the cable to be tested is inserted into the first interface and the other end of the cable to be tested is inserted into the second interface corresponding to the same cable interface.

Images