Method, device and equipment for detecting 2M coaxial cable
By using the method of characteristic pulse signal and reflected wave analysis, the problem of probe size mismatch in 2M coaxial cable testing was solved, achieving high-precision and efficient cable condition assessment, and adapting to different interface types.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIEYANG POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
- Filing Date
- 2026-01-16
- Publication Date
- 2026-05-05
AI Technical Summary
Existing methods for testing 2M coaxial cables suffer from inaccurate test results and are difficult to adapt to different interface types due to the probe diameter being larger than the inner core diameter, leading to poor contact and accidental contact with the outer shell. This also results in low testing efficiency.
The method of characteristic pulse signal and reflected wave analysis is adopted. By generating characteristic pulse signals and receiving reflected wave signals, combined with the load impedance and characteristic impedance of the cable, the voltage amplitude of the reflected wave signal is analyzed to determine the cable condition, avoiding the limitation of physical probe size.
It improves detection accuracy and adaptability, can accurately adapt to different types of interfaces, significantly shortens detection time, and improves overall detection efficiency and accuracy.
Smart Images
Figure CN121978588A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of cable testing technology, and in particular to a testing method, apparatus and equipment for a 2M coaxial cable. Background Technology
[0002] In power communication, 2M cables are responsible for carrying critical services including intercity protection channels, dispatch data network channels, and automation channels. The fabrication of their connectors requires meticulous operation to ensure full and secure solder joints. Poor soldering will lead to bad contact between the inner conductor and the cable head, while irregular solder joint shapes may cause short circuits between the inner conductor and the outer casing. This is especially problematic because 2M cables have a small bore diameter.
[0003] The existing method uses a multimeter to test the continuity and insulation of the core wires in a 2M cable. First, set the multimeter to the ohm range and connect the red and black probes to the inner core of the 2M connector at both ends of the cable. A resistance close to 0 ohms (or a beeping sound) indicates good continuity; otherwise, the connector or cable needs to be checked. Second, to check the continuity of the shielding, connect the probes to the outer shell at both ends. A normal resistance should be close to 0 ohms; otherwise, the open circuit needs to be repaired. Finally, test the insulation between the core wires and the coil. Place the probes between the inner core and the outer shell respectively. A high resistance value indicates good insulation, while a low resistance value indicates a short circuit.
[0004] However, due to the small inner core diameter of 2M coaxial cables, especially the CC3 specification interface, existing methods are prone to poor contact and accidental contact with the outer shell when used because the probe diameter is larger than the inner core diameter. This results in inaccurate results and makes it difficult to adapt to different interface types. Therefore, there is a problem of poor detection effect due to inaccurate detection. Summary of the Invention
[0005] This application provides a method, apparatus, and equipment for detecting 2M coaxial cables, in order to improve the detection accuracy.
[0006] In a first aspect, embodiments of this application provide a method for detecting a 2M coaxial cable, comprising:
[0007] When the initial test result of the dual-head test of the cable under test indicates that the cable under test is in a short-circuit or open-circuit state, in response to the user's operation of performing a single-head test on the cable under test, a characteristic pulse signal is sent to the cable under test. The characteristic pulse signal is determined according to the preset pulse peak value, the rectangular pulse under the preset pulse width, and the unit pulse sequence.
[0008] Receive the reflected wave signal fed back by the cable under test based on the characteristic pulse signal;
[0009] The voltage amplitude of the reflected wave signal is determined based on the reflected wave signal, as well as the load impedance and characteristic impedance of the cable under test.
[0010] The test results of the cable under test are determined and displayed based on the voltage amplitude of the reflected wave signal.
[0011] In one possible implementation, the method further includes:
[0012] Obtain the inner core continuity test results, outer core continuity test results, and core-shell insulation test results of the cable under test for dual-head testing;
[0013] Based on the results of the inner core continuity test, the outer core continuity test, and the core-shell insulation test, a three-dimensional judgment matrix for the cable under test is determined.
[0014] When the inner core continuity test result or outer core continuity test result in the three-dimensional judgment matrix indicates that the cable under test is in a short-circuit or open-circuit state, or when the core-shell insulation test result in the three-dimensional judgment matrix indicates that the cable under test is in a short-circuit or open-circuit state.
[0015] In one possible implementation, the method further includes:
[0016] Apply a detection power signal to one end of the inner core of the cable under test;
[0017] At a preset sampling frequency, the power signal is sampled and detected at the other end of the inner core of the cable under test to obtain the first sampling result;
[0018] Based on the current signal and power signal in the first sampling result, the core continuity detection result is obtained;
[0019] And / or,
[0020] Apply a detection power signal to one end of the outer core of the cable under test;
[0021] At a preset sampling frequency, the power signal is sampled and detected at the other end of the outer core of the cable under test to obtain a second sampling result;
[0022] Based on the current signal and power signal in the second sampling result, the outer core continuity detection result is obtained;
[0023] And / or,
[0024] The core-shell insulation test results are obtained based on the current flow between the inner core and the insulation layer or the current flow between the outer core and the insulation layer.
[0025] In one possible implementation, the characteristic pulse signal satisfies:
[0026] ;
[0027] in, Characterizing the preset pulse width ; Characterization period ; Characterization with Centered on, with a width of A rectangular pulse;
[0028] Characterizes a set of equally spaced instantaneous pulse signals. This indicates the position number of each rectangular pulse within the unit pulse sequence. It is a time variable.
[0029] In one possible implementation, the voltage amplitude of the reflected wave signal is determined based on the reflected wave signal, as well as the load impedance and characteristic impedance of the cable under test, including:
[0030] The reflection coefficient of the cable under test is determined based on its load impedance and characteristic impedance.
[0031] The voltage amplitude of the reflected wave signal is determined based on the reflected wave signal and the reflection coefficient.
[0032] In one possible implementation, the reflection coefficient satisfies:
[0033] ;
[0034] in, Characterizing load impedance, Characterizes the characteristic impedance.
[0035] In one possible implementation, the test result of the cable under test is determined and displayed based on the voltage amplitude of the reflected wave signal, including:
[0036] When the voltage amplitude of the reflected wave signal is within the first amplitude range, the test result of the cable under test is determined and displayed as a short circuit state.
[0037] When the voltage amplitude of the reflected wave signal is within the second amplitude range, the test result of the cable under test is determined and displayed as being under load.
[0038] When the voltage amplitude of the reflected wave signal is within the third amplitude range, the test result of the cable under test is determined and displayed as normal.
[0039] When the voltage amplitude of the reflected wave signal is within the fourth amplitude range, the test result of the cable under test is determined and displayed as a test state; wherein, the first amplitude range, the second amplitude range, the third amplitude range and the fourth amplitude range are all determined according to the preset pulse peak value.
[0040] In one possible implementation, the first amplitude range is less than or equal to 0; the second amplitude range is greater than 0 and less than or equal to 1.5; the third amplitude range is greater than 1.5 and less than 3.2; and the fourth amplitude range is greater than or equal to 3.2.
[0041] Secondly, embodiments of this application provide a detection device for a 2M coaxial cable, comprising:
[0042] The single-head detection unit is used to send a characteristic pulse signal to the cable under test in response to the user's operation of performing a single-head detection on the cable under test when the initial test result of the double-head detection indicates that the cable under test is in a short-circuit or open-circuit state. The characteristic pulse signal is determined according to the preset pulse peak value, the rectangular pulse under the preset pulse width, and the unit pulse sequence.
[0043] The receiving unit is used to receive the reflected wave signal fed back by the cable under test based on the characteristic pulse signal;
[0044] The processing unit is used to determine the voltage amplitude of the reflected wave signal based on the reflected wave signal, as well as the load impedance and characteristic impedance of the cable under test.
[0045] The display processing unit is used to determine and display the test results of the cable under test based on the voltage amplitude of the reflected wave signal.
[0046] Thirdly, embodiments of this application provide a detection device for a 2M coaxial cable, including: a memory and a processor;
[0047] The memory stores the instructions that the computer executes;
[0048] The processor executes computer execution instructions stored in memory, causing the processor to perform the first aspect and / or various possible implementations of the first aspect as described above.
[0049] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the first aspect and / or various possible implementations of the first aspect.
[0050] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the first aspect and / or various possible implementations of the first aspect.
[0051] The coaxial cable testing method provided in this application, when the initial test result of a double-ended test indicates that the cable under test is in a short-circuit or open-circuit state, responds to the user's operation of performing a single-ended test on the cable under test by sending a characteristic pulse signal to the cable under test. The characteristic pulse signal is determined based on a preset pulse peak value, a rectangular pulse with a preset pulse width, and a unit pulse sequence. The method also receives the reflected wave signal fed back by the cable under test based on the characteristic pulse signal; determines the voltage amplitude of the reflected wave signal based on the reflected wave signal, as well as the load impedance and characteristic impedance of the cable under test; and determines and displays the test result of the cable under test based on the voltage amplitude of the reflected wave signal. This technical means, by employing characteristic pulse signal and reflected wave analysis, avoids the problems caused by the size limitations of physical probes, improves testing accuracy, effectively reduces testing errors caused by poor probe contact, and thus improves the overall testing effect and accuracy. Attached Figure Description
[0052] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0053] Figure 1 A schematic diagram illustrating a scenario for the detection method of the coaxial cable provided in this application;
[0054] Figure 2 Flowchart of the testing method for the 2M coaxial cable provided in this application Figure 1 ;
[0055] Figure 3 Flowchart of the testing method for the 2M coaxial cable provided in this application Figure 2 ;
[0056] Figure 4 A schematic diagram of the structure of the detection device for the 2M coaxial cable provided in this application;
[0057] Figure 5 A schematic diagram of the structure of the testing equipment for the 2M coaxial cable provided in this application.
[0058] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0059] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.
[0060] First, let me explain the terms used in this application:
[0061] The cable under test can refer to a 2M coaxial cable, which can be a coaxial communication cable with a transmission rate of 2Mbps (2 megabits per second), and can be used in telecommunications, network or video signal transmission and other fields.
[0062] Currently, a crucial method for testing for poor solder joints is to use a multimeter to check the continuity and insulation of 2M cables. First, set the multimeter to the ohm range and connect the red and black probes to the inner core of the 2M connector at both ends of the cable. If the resistance is close to 0 (or there is a beeping sound), the core wire is connected normally; otherwise, there may be poor contact at the connector or a defect in the cable itself, requiring the 2M connector to be remade or the cable to be replaced. Next, connect the red and black probes to the outer shell of the 2M connector at both ends of the cable. If the resistance is close to 0 (or there is a beeping sound), the shielding wire is connected normally; otherwise, the location of the shielding wire break needs to be located and addressed. Finally, test the insulation between the core wire and the coil. Connect the red and black probes to the inner core and outer shell of the 2M connector, respectively. If there is a significant resistance, the insulation is normal; if the resistance is close to 0 (or there is a beeping sound), there is a short circuit between the core wire and the coil, requiring the 2M connector to be remade. These steps effectively detect continuity and insulation problems in 2M cables, ensuring their proper use.
[0063] However, the traditional method of testing 2M coaxial cables using a multimeter has several problems: First, because the inner core diameter of 2M cables is small, especially for CC3 connectors, the test probe diameter is often larger than the inner core diameter, leading to poor contact and easy accidental contact with the outer shell, increasing the false positive rate and wasting time. Second, traditional methods are prone to accidental contact with the outer shell due to improper operation, resulting in inaccurate results, and are difficult to accurately adapt to different types of interfaces, further affecting the testing accuracy. Finally, the testing process is time-consuming; manually touching the cable core and outer shell with a multimeter is not only prone to short circuits, but even a skilled worker needs 2 to 5 minutes to complete a single test. These problems collectively lead to low testing efficiency and inaccurate results.
[0064] The coaxial cable testing method provided in this application effectively overcomes the problems of probe size mismatch and poor contact caused by the need for physical probes to contact the cable core in traditional testing techniques by employing characteristic pulse signals and reflected wave analysis. The characteristic pulse signal is generated based on preset pulse peak value and pulse width, and can be accurately transmitted to the cable under test. The cable's state is determined by receiving and analyzing the reflected wave signal. This method not only reduces misjudgments caused by accidental contact with the outer shell, but also improves testing accuracy and adaptability. It can accurately adapt to different types of interfaces and significantly shorten testing time, improving overall testing efficiency and accuracy. This allows even cables with complex or small interfaces to be tested quickly and accurately, thus solving the problems of inconvenient operation, long time consumption, and high error rate in traditional methods.
[0065] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.
[0066] Figure 1 A schematic diagram illustrating a scenario for the coaxial cable testing method provided in this application, such as... Figure 1 As shown, the specific application scenario of this application can be a testing device, specifically an intelligent cable tester based on Time Domain Reflectometry (TDR). This testing device can generate and send preset characteristic pulse signals (such as rectangular pulses or unit pulse sequences) to the cable under test, and simultaneously possesses a highly sensitive receiving module for capturing the reflected wave signals fed back by the cable. The testing device integrates a signal processing unit, which can combine the cable's load impedance and characteristic impedance to accurately analyze the voltage amplitude of the reflected wave signal, thereby determining the cable's continuity, insulation, and fault location.
[0067] Figure 2 Flowchart of the testing method for the 2M coaxial cable provided in this application Figure 1 ,like Figure 2 As shown, the method includes:
[0068] S201. When the initial test result of the dual-head test of the cable under test indicates that the cable under test is in a short-circuit or open-circuit state, in response to the user's operation of performing a single-head test on the cable under test, a characteristic pulse signal is sent to the cable under test. The characteristic pulse signal is determined according to the preset pulse peak value, the rectangular pulse under the preset pulse width, and the unit pulse sequence.
[0069] Dual-head testing refers to the process of testing the cable under test using a dual-probe setup. In this embodiment, the user connects both ends of the cable to the corresponding interfaces of the testing equipment to detect the continuity of its inner and outer cores. Optionally, the testing equipment can perform the test based on electrical testing principles. For example, the testing equipment applies a low-voltage test signal (such as a constant current source or pulse signal) to the interface area and determines the continuity by measuring the resistance or impedance changes of the inner and outer cores of the cable. Alternatively, preliminary testing can be performed manually to obtain initial test results for the dual-head testing of the cable.
[0070] The initial test result refers to the test result obtained when performing a double-ended test on the cable under test. From this test result, the condition of the cable under test can be preliminarily determined, which can include normal condition, short-circuit condition, and open-circuit condition. Specifically:
[0071] A normal state can mean that the core wires of the cable under test have good connectivity and good insulation. For example, when using a multimeter to measure the resistance between the cores of the two 2M connectors, it is close to 0 ohms (or there is a beeping sound). At the same time, there is a high resistance value between the core wires and the outer shell, indicating that the cable has no short circuit or open circuit and can effectively transmit signals.
[0072] A short circuit condition can refer to a situation where the resistance between the core wire and the outer shell of the cable under test or between the core wires is close to 0 ohms, which indicates the presence of an unwanted current path. This may be caused by irregular solder joint shape or direct contact.
[0073] An open circuit condition can refer to a situation where, when measuring the continuity of the core wires of a cable under test, the resistance value between the cores at both ends of the 2M connector is infinitely large or much higher than expected. This indicates that there is a break inside the cable under test or that the joint is not properly connected, which prevents current from passing through and affects normal signal transmission.
[0074] When the initial test results indicate that the cable under test is in a short-circuit or open-circuit state, further testing of the cable under test is required to improve the accuracy of the test.
[0075] The operation of performing single-head testing on the cable under test can refer to the operation of testing the cable under test using a single probe. In this embodiment, the operation can be the process by which the user inserts the cable under test into the corresponding interface of the test equipment.
[0076] After the cable under test is inserted into the corresponding interface of the testing equipment, the testing equipment can send a characteristic pulse signal to the cable under test. The characteristic pulse signal can refer to an electrical signal used to detect the cable condition. This signal is a pulse with a specific amplitude, width and period set so that it can be transmitted in the cable and reflects the internal condition of the cable when it is transmitted through the cable according to its characteristics (such as shape, amplitude, rise and fall time, etc.).
[0077] In other words, after a characteristic pulse signal is transmitted through a cable, any signal attenuation, reflection, or distortion caused by internal cable damage, poor connections, or impedance changes will affect the characteristics of the returned pulse. By analyzing these changes in the returned pulse, the testing equipment can accurately identify problems in the cable, such as open circuits, short circuits, or insulation failures, thus providing maintenance personnel with accurate diagnostic information.
[0078] The characteristic pulse signal is determined based on a preset pulse peak value, a rectangular pulse with a preset pulse width, and a unit pulse sequence, wherein:
[0079] The pulse peak value refers to the maximum voltage or amplitude achievable by the characteristic pulse signal; the preset pulse width refers to the duration of each pulse, i.e., the time interval between the rising edge and the falling edge; and the unit pulse sequence refers to a series of pulses arranged at specific time intervals. By precisely setting these three parameters, the testing equipment can generate pulse signals with specific shapes and characteristics and send them to the cable under test. These characteristic pulses, as they travel through the cable, effectively reveal the internal physical state of the cable, thus helping to detect problems such as open circuits, short circuits, or other changes in electrical characteristics. Therefore, by analyzing the returned pulse signals, an accurate assessment of the cable's health status can be achieved.
[0080] In this embodiment of the application, the characteristic pulse signal satisfies:
[0081] ;
[0082] Among them, 3.2 represents the preset pulse peak value. ; Characterizing the preset pulse width ; Characterization period ; The representation is centered at t=0 and has a width of A rectangular pulse; Characterizes a set of equally spaced instantaneous pulse signals, where, Here, n is the Dirac delta function, and n is an integer index variable representing the position number of each rectangular pulse in the unit pulse sequence.
[0083] Where t is a time variable, representing the process of the signal changing over time. Used to describe... The value at any given moment.
[0084] T is the pulse repetition period, which characterizes the time interval between two consecutive pulses in a unit pulse sequence.
[0085] S202, Receive the reflected wave signal fed back by the cable under test based on the characteristic pulse signal.
[0086] The reflected wave signal refers to the portion of a characteristic pulse signal that is reflected back to the signal source when it propagates through the cable under test due to impedance mismatches (such as cable breaks, short circuits, mismatched joints or terminations). By analyzing the time delay, amplitude variation, and waveform characteristics of the reflected wave signal, the specific problems within the cable and their location can be determined.
[0087] S203. Determine the voltage amplitude of the reflected wave signal based on the reflected wave signal, as well as the load impedance and characteristic impedance of the cable under test.
[0088] The load impedance of the cable under test refers to the resistive characteristics presented by the equipment or terminal connected to the end of the cable to the signal, which affects the behavior of the signal at the end of the cable. The load impedance determines how the signal is processed at the end of the cable, that is, whether it is completely absorbed, reflected back, or partially absorbed and partially reflected.
[0089] Characteristic impedance refers to the inherent impedance of a cable. It can be part of the cable design and is primarily determined by the cable's internal physical and electrical characteristics, such as conductor diameter, conductor spacing, and the dielectric constant of the insulation material. Characteristic impedance is a key parameter that measures how a cable interacts with a signal source or load. In some embodiments, characteristic impedance can be 50 ohms or 75 ohms.
[0090] The voltage amplitude of a reflected wave signal refers to the strength or magnitude of the reflected wave signal formed when a characteristic pulse signal encounters an impedance mismatch point in a cable, resulting in partial reflection. This voltage amplitude can be determined by comparing the difference between the original transmitted signal and the reflected signal. The voltage amplitude can also characterize the degree of impedance mismatch in the cable. For example, when the load impedance and the cable's characteristic impedance are mismatched, part of the incident wave will be reflected. The voltage amplitude of the reflected wave signal can be used to calculate the reflection coefficient, thereby helping to locate the fault point and assess its severity. By analyzing the voltage amplitude of the reflected wave signal, problems in the cable and their location can be identified more accurately.
[0091] In this embodiment of the application, determining the voltage amplitude of the reflected wave signal based on the reflected wave signal, as well as the load impedance and characteristic impedance of the cable under test, includes:
[0092] The reflection coefficient of the cable under test is determined based on its load impedance and characteristic impedance.
[0093] The voltage amplitude of the reflected wave signal is determined based on the reflected wave signal and the reflection coefficient.
[0094] The reflection coefficient is a dimensionless parameter defined in a cable to describe the partial reflection of signals due to impedance mismatch. This parameter can be used to quantify the degree of signal reflection caused by the mismatch between the characteristic impedance and the load impedance.
[0095] In this embodiment of the application, the reflection coefficient satisfies:
[0096] ;
[0097] in, Characterizing load impedance, Characterizes the characteristic impedance.
[0098] Among them, when When the characteristic impedance is 0, it means there is no reflected wave, that is, the load impedance and characteristic impedance of the transmission line are perfectly matched, and all incident waves are transmitted to the load and completely absorbed.
[0099] when or A value of 0 indicates a strong reflected wave, meaning there is a severe impedance mismatch. Positive or negative values indicate the phase relationship (in phase or out of phase) of the reflected wave relative to the incident wave.
[0100] In some embodiments, if the cable under test is in a normal state, the load impedance is... Representing infinity, the reflection coefficient at this point All incident signals are completely reflected back, if the total voltage Then the voltage amplitude If the cable under test is in a short-circuit state, the load impedance... At this time, the reflection coefficient All incident signals are reflected back in reverse phase, voltage amplitude .
[0101] If a matching resistor is used, if the load impedance And with characteristic impedance If they are consistent, then the reflection coefficient Voltage amplitude .
[0102] If the load impedance Characteristic impedance ,but Voltage amplitude .
[0103] S204. Based on the voltage amplitude of the reflected wave signal, determine and display the test results of the cable under test.
[0104] Based on the different voltage amplitudes of the reflected wave signal, the voltage amplitude can be divided into multiple amplitude ranges, each corresponding to a different detection result. For example, the first amplitude range can be 0V, the second amplitude range can be 0~1.5V, the third amplitude range can be 1.5~3.2V, and the fourth amplitude range can be greater than 3.2V.
[0105] Furthermore, when the voltage amplitude of the reflected wave signal is within the first amplitude range, the test result of the cable under test is determined to be a short circuit state; when the voltage amplitude of the reflected wave signal is within the second amplitude range, the test result of the cable under test is determined to be a loaded state; when the voltage amplitude of the reflected wave signal is within the third amplitude range, the test result of the cable under test is determined to be a normal state; and when the voltage amplitude of the reflected wave signal is within the fourth amplitude range, the test result of the cable under test is determined to be a test state.
[0106] In this embodiment of the application, determining and displaying the test result of the cable under test based on the voltage amplitude of the reflected wave signal includes:
[0107] When the voltage amplitude of the reflected wave signal is within the first amplitude range, the test result of the cable under test is determined and displayed as a short circuit state.
[0108] When the voltage amplitude of the reflected wave signal is within the second amplitude range, the test result of the cable under test is determined and displayed as being under load.
[0109] When the voltage amplitude of the reflected wave signal is within the third amplitude range, the test result of the cable under test is determined and displayed as normal.
[0110] When the voltage amplitude of the reflected wave signal is within the fourth amplitude range, the test result of the cable under test is determined and displayed as a test state; wherein, the first amplitude range, the second amplitude range, the third amplitude range and the fourth amplitude range are all determined according to the preset pulse peak value.
[0111] The first, second, third, and fourth amplitude ranges are determined by adjusting the peak voltage of the actual test signal used. For example, if the test equipment sends a square wave signal with a peak voltage of 3.2V, the amplitude ranges of the reflected wave voltage corresponding to each state (such as short circuit, under load, normal, and under test) will be divided according to their relationship with the 3.2V peak voltage. This ensures that regardless of the peak voltage of the test signal used, the cable's state can be accurately identified based on the amplitude changes of the reflected wave, resulting in more accurate test results and adaptability to different test conditions.
[0112] In this embodiment, the first amplitude range is less than or equal to 0; the second amplitude range is greater than 0 and less than or equal to 1.5; the third amplitude range is greater than 1.5 and less than 3.2; and the fourth amplitude range is greater than or equal to 3.2. For example, when using a testing device for single-head testing, the screen of the testing device can determine four cable states based on the amplitude changes of the waveform:
[0113] 1. When no cable is connected, the screen will display a 3.2V amplitude waveform, and the output window will display "To be tested";
[0114] 2. When the amplitude waveform attenuates below the amplitude to be tested, the screen can display "normal" because the cable is open and the other end is not connected to the device, but the cable is not abnormal.
[0115] 3. When one end of the cable is connected to a load, the screen output window can display "Loaded" when the pulse amplitude attenuates to half of the peak value (3.2V).
[0116] 4. When the pulse amplitude attenuates to 0V, a short circuit fault occurs in the cable, and the screen output window can display "Short circuit".
[0117] The 2M coaxial cable testing method provided in this application embodiment, when the initial test result of the dual-head test of the cable under test indicates that the cable under test is in a short-circuit or open-circuit state, responds to the user's operation of single-head test of the cable under test by sending a characteristic pulse signal to the cable under test. The characteristic pulse signal is determined according to a preset pulse peak value, a rectangular pulse with a preset pulse width, and a unit pulse sequence. The method also receives the reflected wave signal fed back by the cable under test based on the characteristic pulse signal; determines the voltage amplitude of the reflected wave signal based on the reflected wave signal, as well as the load impedance and characteristic impedance of the cable under test; and determines and displays the test result of the cable under test based on the voltage amplitude of the reflected wave signal. This technical means, by using characteristic pulse signal and reflected wave analysis, avoids the problems caused by the size limitation of physical probes, improves the detection accuracy, effectively improves the detection error caused by poor probe contact, and thus improves the overall detection effect and accuracy.
[0118] Figure 3 Flowchart of the testing method for the 2M coaxial cable provided in this application Figure 2 ,like Figure 3 As shown, in this embodiment... Figure 2 Based on the examples, a detailed description of the testing method for 2M coaxial cables is provided. This method includes:
[0119] S301. Obtain the inner core continuity test results, outer core continuity test results, and core-shell insulation test results of the cable under test for dual-head testing.
[0120] The continuity test result refers to the connectivity status of the main conductive cores inside the cable. This is determined by applying voltage or current to both ends of the cable and measuring the resistance value. If the test shows a resistance value close to zero or within an acceptable small range, it indicates that the core is in a normal continuity state; conversely, if the resistance value is extremely high or even infinite, it indicates an open circuit problem, and the signal cannot be transmitted normally.
[0121] The continuity test result refers to the connectivity and integrity of the cable's outer shielding or protective layer. During testing, a test signal is applied to both ends of the shielding layer, and its resistance or reflected wave characteristics are measured. If the shielding layer exhibits good conductivity, it can effectively prevent external electromagnetic interference and provide a grounding path. If high impedance or open circuits are detected, it indicates that the shielding layer may have a break or other poor contact problems, affecting the cable's shielding effect and safety.
[0122] The core-shell insulation test result refers to the insulation performance between the inner conductor (inner core) and the outer shield or shell of the cable. This test can be performed using a high-resistance meter or insulation tester. A certain DC voltage is applied between the inner core and the outer layer, and then the insulation resistance between them is measured. If the insulation condition shows a high resistance value, it means there is almost no leakage current, indicating good electrical isolation between the inner core and the outer layer. If the insulation resistance is lower than a set safety threshold, it indicates that there may be insulation failure or damage, which could lead to a short circuit or safety hazard.
[0123] In this embodiment of the application, the method further includes:
[0124] Apply a detection power signal to one end of the inner core of the cable under test;
[0125] At a preset sampling frequency, the power signal is sampled and detected at the other end of the inner core of the cable under test to obtain the first sampling result;
[0126] Based on the current signal and power signal in the first sampling result, the core continuity detection result is obtained;
[0127] And / or,
[0128] Apply a detection power signal to one end of the outer core of the cable under test;
[0129] At a preset sampling frequency, the power signal is sampled and detected at the other end of the outer core of the cable under test to obtain a second sampling result;
[0130] Based on the current signal and power signal in the second sampling result, the outer core continuity detection result is obtained;
[0131] And / or,
[0132] The core-shell insulation test results are obtained based on the current flow between the inner core and the insulation layer or the current flow between the outer core and the insulation layer.
[0133] The process involves applying a power signal to one end of the cable core and acquiring the signal at a specific frequency at the other end. By analyzing the relationship between the received current signal and the original power signal, the continuity of the core is determined. If the received current signal is normal and meets expectations, it indicates that the core is not broken or has poor contact, and the cable is connected. Otherwise, if the signal is abnormal or missing, it indicates an open circuit.
[0134] A power signal is applied to one end of the cable core, and the signal is acquired at a specific frequency at the other end. By analyzing the relationship between the received current signal and the original power signal, it is determined whether the core is connected. If the received current signal is normal and as expected, it indicates that the core is not broken or has poor contact, and is in a connected state; otherwise, if the signal is abnormal or missing, it indicates that there is an open circuit problem.
[0135] The insulation performance of a cable is assessed by measuring the current flow between the inner core and the insulation layer, or between the outer core and the insulation layer. Specifically, a certain voltage is applied and the leakage current is measured. If the leakage current is very small or almost zero, it indicates that the insulation layer is intact and the insulation performance is good; conversely, if the leakage current is large, it indicates that the insulation layer may be damaged or aged, leading to insulation failure. This detection helps identify potential safety hazards and ensures the safe use of cables.
[0136] S302. Based on the results of the inner core continuity test, the outer core continuity test, and the core-shell insulation test, determine the three-dimensional judgment matrix of the cable under test.
[0137] The three-dimensional decision matrix refers to a data structure used to determine the condition of the cable under test. This matrix systematically records and analyzes these test results to provide a more comprehensive assessment of the cable's condition. For example, the three-dimensional decision matrix could be:
[0138]
[0139] In the three-dimensional decision matrix, "1" represents the on state; "0" represents the off state; and "*" is a wildcard, indicating that the state of the corresponding parameter does not affect the decision.
[0140] S303. When the inner core continuity test result or outer core continuity test result in the three-dimensional judgment matrix indicates that the cable under test is in a short circuit or open circuit state, or when the core-shell insulation test result in the three-dimensional judgment matrix indicates that the cable under test is in a short circuit or open circuit state.
[0141] The initial test result of the cable under test can be determined by using the test results recorded in the three-dimensional judgment matrix.
[0142] Figure 4 This is a schematic diagram of the structure of the testing device for the 2M coaxial cable provided in this application, as shown below. Figure 4 As shown, the 2M coaxial cable detection device 40 provided in this embodiment includes:
[0143] The single-head detection unit 401 is used to send a characteristic pulse signal to the cable under test in response to the user's operation of performing a single-head detection on the cable under test when the initial test result of the double-head detection of the cable under test indicates that the cable under test is in a short-circuit state or an open-circuit state. The characteristic pulse signal is determined according to the preset pulse peak value, the rectangular pulse under the preset pulse width, and the unit pulse sequence.
[0144] The receiving unit 402 is used to receive the reflected wave signal fed back by the cable under test based on the characteristic pulse signal;
[0145] The processing unit 403 is used to determine the voltage amplitude of the reflected wave signal based on the reflected wave signal, as well as the load impedance and characteristic impedance of the cable under test.
[0146] The display processing unit 404 is used to determine and display the test results of the cable under test based on the voltage amplitude of the reflected wave signal.
[0147] In one possible implementation, the single-head detection unit 401 can also be used for:
[0148] Obtain the inner core continuity test results, outer core continuity test results, and core-shell insulation test results of the cable under test for dual-head testing;
[0149] Based on the results of the inner core continuity test, the outer core continuity test, and the core-shell insulation test, a three-dimensional judgment matrix for the cable under test is determined.
[0150] When the inner core continuity test result or outer core continuity test result in the three-dimensional judgment matrix indicates that the cable under test is in a short-circuit or open-circuit state, or when the core-shell insulation test result in the three-dimensional judgment matrix indicates that the cable under test is in a short-circuit or open-circuit state.
[0151] In one possible implementation, the single-head detection unit 401 can also be used for:
[0152] Apply a detection power signal to one end of the inner core of the cable under test;
[0153] At a preset sampling frequency, the power signal is sampled and detected at the other end of the inner core of the cable under test to obtain the first sampling result;
[0154] Based on the current signal and power signal in the first sampling result, the core continuity detection result is obtained;
[0155] And / or,
[0156] Apply a detection power signal to one end of the outer core of the cable under test;
[0157] At a preset sampling frequency, the power signal is sampled and detected at the other end of the outer core of the cable under test to obtain a second sampling result;
[0158] Based on the current signal and power signal in the second sampling result, the outer core continuity detection result is obtained;
[0159] And / or,
[0160] The core-shell insulation test results are obtained based on the current flow between the inner core and the insulation layer or the current flow between the outer core and the insulation layer.
[0161] In one possible implementation, the characteristic pulse signal in the single-head detection unit 401 satisfies:
[0162] ;
[0163] in, Characterizing the preset pulse width ; Characterization period ; Characterization with Centered on, with a width of A rectangular pulse;
[0164] Characterizes a set of equally spaced instantaneous pulse signals. This indicates the position number of each rectangular pulse within the unit pulse sequence. It is a time variable.
[0165] In one possible implementation, the receiving unit 402 can also be specifically used for:
[0166] The reflection coefficient of the cable under test is determined based on its load impedance and characteristic impedance.
[0167] The voltage amplitude of the reflected wave signal is determined based on the reflected wave signal and the reflection coefficient.
[0168] In one possible implementation, the reflection coefficient in the receiving unit 402 satisfies:
[0169] ;
[0170] in, Characterizing load impedance, Characterizes the characteristic impedance.
[0171] In one possible implementation, the single-head detection unit 401 can also be used for:
[0172] Based on the voltage amplitude of the reflected wave signal, the test results of the cable under test are determined and displayed, including:
[0173] When the voltage amplitude of the reflected wave signal is within the first amplitude range, the test result of the cable under test is determined and displayed as a short circuit state.
[0174] When the voltage amplitude of the reflected wave signal is within the second amplitude range, the test result of the cable under test is determined and displayed as being under load.
[0175] When the voltage amplitude of the reflected wave signal is within the third amplitude range, the test result of the cable under test is determined and displayed as normal.
[0176] When the voltage amplitude of the reflected wave signal is within the fourth amplitude range, the test result of the cable under test is determined and displayed as a test state; wherein, the first amplitude range, the second amplitude range, the third amplitude range and the fourth amplitude range are all determined according to the preset pulse peak value.
[0177] In one possible implementation, the single-head detection unit 401 can also be used for:
[0178] The first amplitude range is less than or equal to 0; the second amplitude range is greater than 0 and less than or equal to 1.5; the third amplitude range is greater than 1.5 and less than 3.2; and the fourth amplitude range is greater than or equal to 3.2.
[0179] The 2M coaxial cable detection device provided in this embodiment can execute the method provided in the above-described method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.
[0180] Figure 5 This is a schematic diagram of the testing equipment for the 2M coaxial cable provided in this application. Figure 5 As shown, the 2M coaxial cable detection device 50 provided in this embodiment includes at least one processor 501 and a memory 502. Optionally, the device 50 also includes a communication component 503. The processor 501, memory 502, and communication component 503 are connected via a bus 504.
[0181] In a specific implementation, at least one processor 501 executes computer execution instructions stored in memory 502, causing at least one processor 501 to perform the above-described method.
[0182] The specific implementation process of processor 501 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.
[0183] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.
[0184] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.
[0185] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.
[0186] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.
[0187] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described method.
[0188] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.
[0189] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.
[0190] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.
[0191] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
[0192] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.
[0193] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0194] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.
[0195] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.
Claims
1. A method for testing a 2M coaxial cable, characterized in that, include: When the initial test result of the dual-head test of the cable under test indicates that the cable under test is in a short-circuit or open-circuit state, in response to the user's operation of performing a single-head test on the cable under test, a characteristic pulse signal is sent to the cable under test. The characteristic pulse signal is determined according to the preset pulse peak value, the rectangular pulse under the preset pulse width, and the unit pulse sequence. Receive the reflected wave signal fed back by the cable under test based on the characteristic pulse signal; The voltage amplitude of the reflected wave signal is determined based on the reflected wave signal, the load impedance and characteristic impedance of the cable under test; The test result of the cable under test is determined and displayed based on the voltage amplitude of the reflected wave signal.
2. The method according to claim 1, characterized in that, The method further includes: Obtain the inner core continuity test results, outer core continuity test results, and core-shell insulation test results of the cable under test for dual-head testing; Based on the inner core continuity test results, the outer core continuity test results, and the core-shell insulation test results, a three-dimensional judgment matrix for the cable under test is determined. When the inner core continuity test result or outer core continuity test result in the three-dimensional judgment matrix indicates that the cable under test is in a short-circuit or open-circuit state, or when the core-shell insulation test result in the three-dimensional judgment matrix indicates that the cable under test is in a short-circuit or open-circuit state.
3. The method according to claim 2, characterized in that, The method further includes: A detection power signal is applied to one end of the inner core of the cable under test; The power signal is sampled and detected at the other end of the inner core of the cable under test at a preset sampling frequency to obtain the first sampling result; The continuity test result of the inner core is obtained based on the current signal and the power signal in the first sampling result; And / or, A detection power signal is applied to one end of the outer core of the cable under test; The power signal is sampled and detected at the other end of the outer core of the cable under test at a preset sampling frequency to obtain a second sampling result; The outer core continuity detection result is obtained based on the current signal and the power signal in the second sampling result; And / or, The core-shell insulation test result is obtained based on the current flow between the inner core and the insulation layer or the current flow between the outer core and the insulation layer.
4. The method according to claim 1, characterized in that, The characteristic pulse signal satisfies: ； Among them, the Characterizing the preset pulse width The Characterization period The Characterization with Centered on, with a width of A rectangular pulse; The Characterizing a set of equally spaced instantaneous pulse signals, the This indicates the position number of each rectangular pulse in the unit pulse sequence. It is a time variable.
5. The method according to claim 1, characterized in that, The step of determining the voltage amplitude of the reflected wave signal based on the reflected wave signal, and the load impedance and characteristic impedance of the cable under test, includes: The reflection coefficient of the cable under test is determined based on its load impedance and characteristic impedance. The voltage amplitude of the reflected wave signal is determined based on the reflected wave signal and the reflection coefficient.
6. The method according to claim 5, characterized in that, The reflection coefficient satisfies: ； Among them, the Characterizing the load impedance, the Characterizes the characteristic impedance.
7. The method according to any one of claims 1 to 6, characterized in that, Based on the voltage amplitude of the reflected wave signal, the test result of the cable under test is determined and displayed, including: When the voltage amplitude of the reflected wave signal is within the first amplitude range, the detection result of the cable under test is determined and displayed as a short circuit state; When the voltage amplitude of the reflected wave signal is within the second amplitude range, the test result of the cable under test is determined and displayed as being under load. When the voltage amplitude of the reflected wave signal is within the third amplitude range, the test result of the cable under test is determined and displayed as normal. When the voltage amplitude of the reflected wave signal is within the fourth amplitude range, the test result of the cable under test is determined and displayed as a test state; wherein, the first amplitude range, the second amplitude range, the third amplitude range and the fourth amplitude range are all determined according to a preset pulse peak value.
8. The method according to claim 7, characterized in that, The first amplitude range is less than or equal to 0; the second amplitude range is greater than 0 and less than or equal to 1.5; the third amplitude range is greater than 1.5 and less than 3.2; and the fourth amplitude range is greater than or equal to 3.
2.
9. A testing device for a 2M coaxial cable, characterized in that, include: The single-head detection unit is used to send a characteristic pulse signal to the cable under test in response to the user's operation of performing a single-head detection on the cable under test when the initial test result of the dual-head detection indicates that the cable under test is in a short-circuit or open-circuit state. The characteristic pulse signal is determined according to a preset pulse peak value, a rectangular pulse with a preset pulse width, and a unit pulse sequence. The receiving unit is used to receive the reflected wave signal fed back by the cable under test based on the characteristic pulse signal; The processing unit is used to determine the voltage amplitude of the reflected wave signal based on the reflected wave signal and the load impedance and characteristic impedance of the cable under test. The display processing unit is used to determine and display the test result of the cable under test based on the voltage amplitude of the reflected wave signal.
10. A testing device for a 2M coaxial cable, characterized in that, include: Memory, processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory, causing the processor to perform the method as described in any one of claims 1-8.