An online measurement method and device for multi-channel cable conduction test using a multimeter

Abstract

The present application relates to the technical field of multi-channel cable continuity testing, and discloses a multi-channel cable continuity testing method and device for on-line measurement with a multimeter. The method includes: electrically connecting a tester and a multimeter, decoding and transferring the liquid crystal display driving signal of the multimeter, and outputting a real-time digital signal; conditioning and converting the real-time digital signal to obtain a standard high and low level signal; sequentially switching multiple channels of the cable under test to obtain the wire cores to be tested that are successively connected to the red test lead interface and the black test lead interface at the tester end; triggering the multimeter to measure the resistance value for each switched wire core to be tested, and collecting the measurement results to obtain the original measurement data corresponding to the wire cores to be tested; analyzing and judging the original measurement data of all the wire cores to be tested through a data processing module to obtain a cable test report including the resistance value and conduction state of each channel. The present application improves the accuracy and versatility of the cable continuity measurement device.

Description

Technical Field

[0001] This application relates to the technical field of multi-channel cable continuity testing, and particularly to a method and device for multi-channel cable continuity testing with an on-line measurement using a multimeter. Background Art

[0002] The reliable and effective connection of cables is the fundamental guarantee for the safe operation of electrical equipment. Currently, most cable continuity detections use a multimeter or a megohmmeter to manually judge the continuity and insulation of each wire in a single system by point-by-point connection according to process instructions. This manual wire alignment method not only wastes human resources but also wastes time. At the same time, with the increase in the number of cable cores, it will also lead to misoperations and misjudgments, resulting in poor reliability of the test results of cable continuity tests.

[0003] Although there are currently detection devices that have achieved semi-automatic or even automatic digital detection of cable continuity, there is still a certain gap between their measured conduction resistance range and measurement accuracy and that of a multimeter. Moreover, for some cables, it is clearly stipulated in their detection instructions that a multimeter should be used as the detection tool. For example, for oil well logging cables, there are relatively clear requirements for the multimeters (resistance meters) used for their conduction measurement: use a FLUKE multimeter, with a range of 0 - 50 MΩ, an accuracy of 1.5%, a resolution of 0.1 Ω for 600 Ω, and automatic range. Therefore, existing automated cable detection devices cannot meet such detection requirements. At the same time, because multimeters often do not have a real-time data output function, or their output data needs to be collected by dedicated measurement software, they cannot cooperate with the measurement control system to achieve synchronous measurement. This is also the main reason why no detection device uses a multimeter for resistance measurement. Summary of the Invention

[0004] This application provides a method and device for multi-channel cable continuity testing with an on-line measurement using a multimeter, which is used to improve the accuracy and versatility of cable continuity measurement devices.

[0005] In a first aspect, this application provides a method for multi-channel cable continuity testing with an on-line measurement using a multimeter. The method for multi-channel cable continuity testing with an on-line measurement using a multimeter includes:

[0006] Electrically connect the tester and the multimeter, decode and transfer the liquid crystal display driving signal of the multimeter through a signal processing module, and output real-time digital signals through a signal output interface;

[0007] Condition and convert the real-time digital signals through a signal conditioning module to obtain standard high and low level signals recognizable by the controller of the tester;

[0008] Sequentially switch multiple channels of the cable under test through a channel selection module to obtain the wire cores to be tested that are successively connected to the red test lead interface and the black test lead interface at the tester end;

[0009] The measurement control module triggers the multimeter to measure the resistance value of each switched core to be measured, and collects the measurement results through the signal input interface to obtain the original measurement data corresponding to the core to be measured.

[0010] The data processing module analyzes and judges the original measurement data of all cores to be measured to obtain a cable test report including the resistance value and conduction state of each channel.

[0011] In a second aspect, the present application provides a multimeter online measurement type multi-channel cable conduction test device, and the multimeter online measurement type multi-channel cable conduction test device includes:

[0012] A tester, including an upper interface of the tester end cable, a lower interface of the tester end cable, a red test lead interface of the tester end, a black test lead interface of the tester end, and a signal input interface of the tester end; the tester further includes a channel selection module for controlling the conduction between the cable core and the red test lead interface or the black test lead interface of the tester end; a multimeter, including a red test lead interface of the multimeter end, a black test lead interface of the multimeter end, and a signal output interface of the multimeter end; a red test lead connecting wire for connecting the red test lead interface of the multimeter end and the red test lead interface of the tester end; a black test lead connecting wire for connecting the black test lead interface of the multimeter end and the black test lead interface of the tester end; a signal connecting wire for connecting the signal output interface of the multimeter end and the signal input interface of the tester end; an upper jumper wire for connecting the cable under test and the upper interface of the tester end cable; a lower jumper wire for connecting the cable under test and the lower interface of the tester end cable.

[0013] In a third aspect of the present application, there is provided a multimeter online measurement type multi-channel cable conduction test device, including: a memory and at least one processor, and instructions are stored in the memory; the at least one processor calls the instructions in the memory so that the multimeter online measurement type multi-channel cable conduction test device executes the above-mentioned multimeter online measurement type multi-channel cable conduction test method.

[0014] In a fourth aspect of the present application, there is provided a computer-readable storage medium, and instructions are stored in the computer-readable storage medium, and when it runs on a computer, it causes the computer to execute the above-mentioned multimeter online measurement type multi-channel cable conduction test method.

[0015] In the technical solution provided by the present application, by decoding the driving signal of the multimeter liquid crystal screen, the real-time reading of the multimeter measurement result is realized. By combining the real-time acquisition function of the multimeter measurement result with the multi-channel measurement and control system, a multimeter online measurement type multi-channel cable conduction test device is designed, realizing the synchronous control and measurement of the measurement and control system and the multimeter, and improving the accuracy and versatility of the cable conduction measurement device. Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of an embodiment of the online measurement type multi-channel cable conduction test method with a multimeter in the embodiments of the present application;

[0018] Figure 2 It is a schematic diagram of an embodiment of the online measurement type multi-channel cable conduction test device with a multimeter in the embodiments of the present application;

[0019] Figure 3 It is a schematic diagram of the measurement and control principle in the embodiments of the present application;

[0020] Figure 4 It is a schematic diagram of the multimeter data output interface in the embodiments of the present application;

[0021] Figure 5 It is a schematic diagram of the function of the signal conditioning module in the embodiments of the present application. Detailed Embodiments

[0022] The embodiments of the present application provide an online measurement type multi-channel cable conduction test method and device with a multimeter. The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims and accompanying drawings of the present application are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments described here can be implemented in an order other than that illustrated or described here. In addition, the term "comprising" or "having" and any variation thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily limit to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0023] For ease of understanding, the specific process of the embodiments of the present application will be described below. Please refer to Figure 1 , an embodiment of the online measurement type multi-channel cable conduction test method with a multimeter in the embodiments of the present application includes:

[0024] Step S101: Electrically connect the tester and the multimeter. Decode and transfer the LCD drive signal of the multimeter through the signal processing module, and output the real-time digital signal through the signal output interface.

[0025] It can be understood that the execution subject of this application can be an online measurement multi-channel cable conduction test device for a multimeter, or a terminal or a server. Specifically, it is not limited here. In this embodiment of the application, the server is used as the execution subject for illustration.

[0026] Specifically, connect the red test lead and black test lead of the multimeter to the red test lead interface and black test lead interface of the tester respectively through connecting wires to ensure the complete connection of the measurement circuit. Connect the signal output interface of the multimeter to the signal input interface of the tester through a signal connecting wire to transmit the measurement data of the multimeter in real time. Connect the cable under test to the upper cable interface and lower cable interface of the tester through the upper jumper wire and lower jumper wire respectively. Decode the LCD drive signal of the multimeter through the signal processing module, obtain and transfer the signal lines corresponding to the resistance value result display, including the resistance value signal, resistance unit signal, decimal point signal and common terminal signal, so that the signal output by the main control chip of the multimeter can be accurately identified and processed. During the decoding process, the signal processing module separates and identifies each component in the LCD drive signal of the multimeter, namely the resistance value, unit, decimal point position, etc., through a dedicated signal decoding circuit. The resistance value signal represents the actually measured resistance value, the resistance unit signal indicates the unit corresponding to this value (such as ohm, kiloohm, etc.), the decimal point signal is used to determine the decimal point position in the value, and the common terminal signal is the common electrode signal of the liquid crystal display. After these signals are decoded, they are respectively transferred to the signal output interface. Through the signal output interface, output the real-time digital signal including the resistance value, unit, and decimal point position.

[0027] Step S102: Condition and convert the real-time digital signal through the signal conditioning module to obtain the standard high and low level signals recognizable by the controller of the tester.

[0028] Specifically, the signal conditioning module receives the real-time digital signals output by the multimeter through the signal output interface. These real-time digital signals include high-level signals, low-level signals, a first signal, and a second signal. Analyze the first signal and the second signal, and convert the first signal and the second signal into corresponding high-level or low-level signals. The level conversion circuit uniformly adjusts all signals to the standard logic levels recognizable by the controller of the tester, and eliminates the glitches and interferences existing in all signals, ensuring the accuracy and reliability of the signals. Shape the processed signals into regular square wave signals, ensuring that the rising edges and falling edges of the regular square wave signals meet the recognition requirements of the controller of the tester. The shaping process of the square wave signals eliminates the glitches and interferences in the signals, making the rising edges and falling edges of the signals steeper and clearer, ensuring that the signals are not distorted during transmission. The shaping of the square wave signals can also enhance the anti-interference ability of the signals, enabling them to maintain stable transmission quality in a complex electromagnetic environment.

[0029] Step S103: Sequentially switch multiple channels of the cable under test through the channel selection module to obtain the wire cores to be tested that are successively connected to the red test lead interface and the black test lead interface of the tester end;

[0030] Specifically, connect the cable under test to the upper cable interface of the tester end through the upper jumper wire, and at the same time connect it to the lower cable interface of the tester end through the lower jumper wire to ensure the correct and stable physical connection of the entire test system. Initialize the channel selection module inside the tester, place all channels in the disconnected state to ensure that the system is not affected by external interference in the initial state. According to the preset test sequence, sequentially select the wire cores to be tested of the cable under test. At this time, the channel selection module starts to work. Control the channel selection module to connect the selected wire core to be tested to the red test lead interface of the tester end through the upper cable interface of the tester end. At the same time, the channel selection module continues to work, and connect the reference wire core corresponding to the selected wire core to be tested to the black test lead interface of the tester end through the lower cable interface of the tester end. After the connection is completed, confirm the connection status of the current wire core to be tested and the reference wire core, and send a ready signal to the measurement control module, indicating that this measurement channel is ready for measurement. After receiving the ready signal, the measurement control module immediately starts the measurement program to measure the resistance value or conduction state of the currently connected wire core to be tested. After completing the measurement of the current wire core to be tested, the channel selection module starts again, disconnects the connection of the measured wire core, and switches to the next group of wire cores to be tested and reference wire cores to ensure the continuity and orderliness of the entire measurement process. This process continues, and the channel selection module repeats the above steps to ensure that each wire core to be tested and reference wire core can be accurately connected and measured. Until the sequential switching of all channels of the cable under test is completed.

[0031] Step S104: The measurement control module triggers the multimeter to measure the resistance value of each switched core to be measured, and collects the measurement results through the signal input interface to obtain the original measurement data corresponding to the core to be measured.

[0032] Specifically, the measurement control module receives the ready signal sent by the channel selection module to confirm that the current core to be measured is connected to the red test lead interface and the black test lead interface of the tester. After confirming the connection status, the multimeter is controlled to enter the resistance measurement mode and the automatic range function is enabled, so that the multimeter can automatically select an appropriate range according to the actual resistance value of the core to be measured, ensuring the accuracy and reliability of the measurement results. The measurement control module triggers the multimeter to measure the resistance value of the current core to be measured, and this operation is automatically completed by the measurement control module to ensure the high efficiency and accuracy of the measurement process for each core to be measured. While the multimeter starts to measure, the driving signals of the liquid crystal display screen of the multimeter are received in real time through the signal input interface. These driving signals include resistance value signals, resistance unit signals, decimal point signals and common terminal signals. These signals are processed by the signal conditioning module, and the signal conditioning module converts the received driving signals into standard high and low level signals recognizable by the controller of the tester for subsequent data analysis and processing. When analyzing the converted signals, the complete resistance measurement data, including the value, unit and decimal point position, is extracted. The resistance measurement data is associated with the channel information of the current core to be measured to obtain the original measurement data, ensuring that each measurement result has a clear channel identifier. After obtaining the original measurement data, it is stored in the data storage module, and a measurement completion signal is sent to the channel selection module to prepare for the measurement of the next channel. After receiving the measurement completion signal, the channel selection module starts to switch to the next group of cores to be measured and reference cores, and repeats the above measurement process. The entire measurement process includes receiving the ready signal, entering the resistance measurement mode, triggering the measurement, receiving the driving signals, converting the signals, analyzing the data, storing the data and sending the measurement completion signal, ensuring that each core to be measured can be accurately measured.

[0033] Step S105: The data processing module analyzes and judges the original measurement data of all cores to be measured to obtain a cable test report including the resistance value and conduction status of each channel.

[0034] Specifically, the data processing module receives and organizes the original measurement data of all the wire cores to be tested. These data include channel information and the resistance measurement results corresponding to each channel. The data processing module conducts preliminary organization on the received original measurement data to ensure that each measurement result can accurately correspond to a specific channel. The data processing module calculates the resistance value of each channel based on the original measurement data. Considering the possible errors and noises in the measurement process, the data is smoothed and corrected through an algorithm to obtain more accurate and reliable resistance value data. The resistance value of each channel is evaluated according to the preset conduction judgment criteria, which are usually based on industry specifications or requirements of specific application scenarios, to ensure the scientificity and rationality of the evaluation results. During the evaluation process, a comprehensive judgment is made in combination with the actual situation of each channel to obtain the conduction state of each channel. At the same time, the resistance value differences between adjacent channels are compared, and through comparative analysis, it is judged whether there are short circuits or abnormal connection situations. The change trend of the resistance value of each channel is analyzed, and by comparing historical data and current data, possible intermittent faults or poor contact problems are identified. After completing the above analysis and judgment, the data processing module generates a cable test report containing the resistance values and conduction states of each channel. The report records the test results of each channel, including resistance value data, conduction state, short circuit situation, and abnormal connection situation, etc. And the report is visually displayed, and the resistance values and conduction states of each channel are intuitively displayed in the form of charts and graphs.

[0035] Analyze the preset conduction judgment criteria to obtain the upper resistance threshold and the lower resistance threshold, and compare the resistance values of each channel according to the upper resistance threshold and the lower resistance threshold to obtain the preliminary conduction state judgment result. By comparing the actual measured resistance value of each channel with the preset threshold, it is determined whether the channel is conducting or disconnected. Perform fuzzy logic processing on the preliminary conduction state judgment result to obtain the corrected conduction state considering measurement errors. The fuzzy logic processing method can effectively handle the uncertainties and errors in measurement to ensure the accuracy of the judgment result. Classify all channels according to the corrected conduction state to obtain the channel sets in the conducting, disconnected, and suspicious states. For the channel set in the suspicious state, perform multiple repeated measurements to obtain the resistance value fluctuation range, and perform Bayesian probability analysis on the suspicious state channels according to the resistance value fluctuation range to obtain the final conduction state judgment result. Multiple repeated measurements can effectively capture the change of the channel resistance value, and Bayesian probability analysis can obtain a more reliable conduction state judgment result based on all measurement data. Calculate the difference between the resistance values of adjacent channels to obtain the resistance value difference matrix between channels, and perform clustering analysis on the abnormal differences according to the resistance value difference matrix to obtain the channel groups with potential short circuits or abnormal connections. By calculating the resistance value difference between channels, abnormal conditions between adjacent channels can be effectively discovered, and clustering analysis can classify these abnormal conditions to identify the channel groups that may have short circuits or abnormal connections. Perform time series correlation analysis on the channel groups with potential short circuits or abnormal connections to obtain the time pattern of the fault occurrence, and classify the fault types according to the time pattern to obtain the judgment results of persistent faults and intermittent faults. Time series correlation analysis can identify the time characteristics of the fault occurrence, and then classify the fault types to determine whether it is a persistent fault or an intermittent fault. Perform time series analysis on the historical resistance value data of each channel to obtain the resistance value change trend curve, and perform wavelet transform according to the resistance value change trend curve to obtain the resistance value fluctuation characteristics at different scales. Time series analysis can reveal the law of the channel resistance value changing with time, and wavelet transform can analyze the fluctuation of the resistance value at different time scales to identify subtle change characteristics. Perform pattern recognition on the resistance value fluctuation characteristics to obtain the classification results of normal fluctuation, gradual change trend, and mutation points, and perform linear regression analysis on the gradual change trend according to the classification results to obtain the resistance value change rate. Pattern recognition can classify different characteristics of the resistance value fluctuation, and linear regression analysis can quantify the change rate of the gradual change trend to provide data support for fault prediction. Perform clustering analysis on the mutation points to obtain the potential intermittent fault occurrence time points, and perform comprehensive evaluation according to the resistance value change rate and the intermittent fault time points to obtain the cable aging degree and the fault risk level. By identifying the mutation points through clustering analysis, the potential intermittent fault occurrence time points can be found, and the comprehensive evaluation can combine the resistance value change rate and the intermittent fault time points to quantify the cable aging degree and the fault risk.The conduction state, short - circuit judgment, and fault risk level are weighted and fused to obtain the comprehensive health index of each channel. By comprehensively considering various evaluation results, an intuitive index is provided to reflect the overall health status of each channel.

[0036] In the embodiment of the present application, by decoding the liquid - crystal display (LCD) drive signal of the multimeter, the real - time reading of the multimeter measurement result is realized. By combining the real - time acquisition function of the multimeter measurement result with the multi - channel measurement and control system, a multi - channel cable conduction test device with on - line measurement of the multimeter is designed, realizing the synchronous control and measurement of the measurement and control system and the multimeter, and improving the accuracy and versatility of the cable conduction measurement device.

[0037] In a specific embodiment, the process of executing step S101 may specifically include the following steps:

[0038] (1) Connect the red test lead and black test lead of the multimeter to the red test - lead interface and black test - lead interface of the tester respectively through connecting wires;

[0039] (2) Connect the signal output interface of the multimeter to the signal input interface of the tester through a signal connecting wire;

[0040] (3) Connect the cable to be measured to the upper - end cable interface and lower - end interface of the tester through the upper cross - connecting wire and lower cross - connecting wire respectively;

[0041] (4) Decode the drive signal of the LCD drive signal of the multimeter through the signal processing module, and transfer the signal lines corresponding to the resistance value display, including the resistance value numerical signal, resistance value unit signal, decimal - point signal, and common - end signal, from the main control chip of the multimeter to the signal output interface;

[0042] (5) Output a real - time digital signal containing the resistance value, unit, and decimal - point position through the signal output interface.

[0043] As Figure 3 shown, Figure 3 is a schematic diagram of the measurement and control principle of the multi - channel cable conduction test device with on - line measurement of the multimeter. The multimeter collects the resistance values at both ends of the cable through the red and black test leads, and the measurement results are displayed on the LCD screen. The relevant electrical signals for driving the LCD screen to display, such as the resistance value numerical signal, resistance value unit signal, decimal - point signal, and common - end information, are transmitted to the tester through the connecting wire. The tester converts these relevant signals into electrical signals recognizable by the controller through the internal signal conditioning module, and thus the tester can realize the real - time acquisition of the multimeter measurement results. The connection between the multimeter test leads and different wire cores of the cable is switched through the channel selection module inside the tester.

[0044] As Figure 4 shown, Figure 4It is a schematic diagram of the data output interface of a multimeter. Since a multimeter itself often does not have a data output function, or the output data needs to be collected through a dedicated software, which cannot achieve real-time communication between the tester and the multimeter. Therefore, the present invention adopts the method of decoding the driving signal of the multimeter liquid crystal screen to indirectly read the measurement result. Taking the FLUKE15B+ multimeter as an example, its liquid crystal screen has a total of 20 signal lines. The present invention transfers 12 signal lines related to the display of the resistance result to the signal output interface of the 11 multimeter end, so as to realize the synchronous output of the multimeter measurement result.

[0045] Specifically, connect the red test lead and black test lead of the multimeter to the red test lead interface and black test lead interface of the tester respectively through connecting wires to ensure that the multimeter is directly electrically connected to the tester to realize the resistance measurement of the cable under test. Connect the signal output interface of the multimeter to the signal input interface of the tester through a signal connecting wire. Connect the cable under test to the upper cable interface and lower cable interface of the tester through the upper jumper wire and lower jumper wire respectively to ensure that the electrical connection of the entire test system is correct and stable. At this time, the driving signal of the multimeter liquid crystal screen is decoded by the signal processing module, and these signals include resistance value signal, resistance unit signal, decimal point signal and common terminal signal. The signal processing module transfers these signals from the main control chip of the multimeter to the signal output interface, so as to realize the real-time transmission of the signals. For example, assume that the measured resistance of the cable is 10.5 ohms. At this time, the driving signal displayed on the liquid crystal screen includes the value 10.5, the unit ohm, the decimal point position and the common terminal signal. These signals are decoded by the signal processing module and converted into standard signals that the tester can recognize, and then transmitted to the tester for further processing and analysis. Express the signal processing and transmission in the measurement process with a formula. For example, let the resistance value signal be R, the resistance unit signal be U, the decimal point signal be D, and the common terminal signal be C. In the signal processing module, these signals are decoded into digital signal S, which is expressed as follows:

[0046] S = f(R, U, D, C);

[0047] Among them, f is the decoding function of the signal processing module, which converts the original signals R, U, D, and C into standard digital signals S, ensuring that the signals are not distorted during transmission and can be correctly recognized and processed by the tester. The signal S after decoding and conversion is output through the signal output interface and transmitted to the tester in real time. After receiving the signal S, the tester analyzes and processes it through the internal signal input interface to obtain the final measurement results, including information such as the resistance value and conduction state of the cable. Through the connection and signal processing methods, not only can the test efficiency and accuracy be improved, but also the measurement data of the multimeter can be obtained in real time and accurately analyzed and judged. For example, during the measurement of multiple cables, the signal processing module can achieve real-time measurement and data transmission of each cable, thereby improving the automation level of the test and the efficiency of data processing.

[0048] In a specific embodiment, the process of executing step S102 may specifically include the following steps:

[0049] (1) Receive the real-time digital signal output by the multimeter through the signal output interface through the signal conditioning module. The real-time digital signal includes high-level signals, low-level signals, first signals, and second signals;

[0050] (2) Identify the high-level and low-level signals in the real-time digital signal;

[0051] (3) Analyze the first signal and the second signal, and convert the first signal and the second signal into corresponding high-level or low-level signals;

[0052] (4) Uniformly adjust all signals to the standard logic level recognizable by the controller of the tester through the level conversion circuit, and eliminate the glitches and interferences existing in all signals;

[0053] (5) Shape the processed signal into a regular square wave signal, ensure that the rising edge and falling edge of the regular square wave signal meet the recognition requirements of the controller of the tester, and output the conditioned and converted standard high and low level signals.

[0054] As Figure 5 shown, Figure 5 is a schematic diagram of the function of the signal conditioning module. The signal conditioning module is used to convert the electrical signal that drives the liquid crystal display of the multimeter into an electrical signal recognizable by the controller of the tester. The signal output by the multimeter is as Figure 5As shown by the upper-middle curve, it includes high-level signals, low-level signals, signal 1 (i.e., the first signal), and signal 2 (i.e., the second signal). However, for the controller of the tester, it can only recognize high and low level signals, and will fail to recognize or mis-recognize the first signal and the second signal at high and low levels, resulting in incorrect acquisition of resistance values. Therefore, by designing a signal conditioning module, the output signal of the multimeter is converted into an electrical signal with only high and low levels as shown by Figure 5 the lower curve, thus enabling the controller of the tester to accurately recognize the data of the multimeter.

[0055] Specifically, the signal conditioning module receives real-time digital signals output by the multimeter through the signal output interface. These signals include high-level signals, low-level signals, the first signal, and the second signal. High-level signals usually represent logic "1", while low-level signals represent logic "0". When identifying high and low level signals in the real-time digital signals, the signal conditioning module uses a threshold voltage (V th ) to distinguish high and low levels. If the input signal voltage V in is greater than V th , it is considered a high level; if V in is less than V th , it is considered a low level. This process can be implemented through a comparator circuit, and the output of the comparator is a logic signal representing the level state of the input signal. For the analysis of the first signal and the second signal, digital signal processing technology is used. Assume that after analog-to-digital conversion, the first signal S1 and the second signal S2 respectively obtain digital signals D1 and D2. These signals can be processed through specific algorithms. For example, if S1 and S2 are analog sensor signals, filters can be used to remove noise and amplifiers can be used to adjust the signal amplitude. The first signal and the second signal are converted into corresponding high or low level signals. By comparing their amplitudes with a preset threshold, if D1 is greater than the threshold V th1 , a high level is output; otherwise, a low level is output. Similarly, if D2 is greater than the threshold V th2 , a high level is output; otherwise, a low level is output. Through a level conversion circuit, all signals are uniformly adjusted to the standard logic levels recognizable by the controller of the tester, and the glitches and interferences existing in all signals are eliminated. This is achieved through a Schmitt trigger. The Schmitt trigger has a hysteresis characteristic and can effectively filter out glitches and noise, outputting a stable logic signal. Its working principle can be expressed by the following formula:

[0056]

[0057] where V th-high and V th-lowThey are the high threshold and low threshold of the Schmitt trigger, respectively, ensuring that when the input signal fluctuates between the high threshold and the low threshold, the output signal will not switch frequently, thus avoiding the generation of glitches. Through an edge detection circuit and a signal shaping circuit, the processed signal is shaped into a regular square wave signal. The edge detection circuit detects the rising edge and falling edge of the signal to ensure that the rise time and fall time of the signal meet the requirements of the tester controller. The signal shaping circuit then adjusts the signal into a standard square wave signal to ensure the symmetry and stability of the signal.

[0058] In a specific embodiment, the process of executing step S103 may specifically include the following steps:

[0059] S11: Connect the cable under test to the upper interface of the tester cable through the upper jumper wire and to the lower interface of the tester cable through the lower jumper wire;

[0060] S12: Initialize the channel selection module inside the tester and set all channels to the disconnected state;

[0061] S13: Select the cores to be tested of the cable under test in sequence according to the preset test order;

[0062] S14: Control the channel selection module to connect the selected core to be tested to the red probe interface of the tester cable through the upper interface of the tester cable;

[0063] S15: At the same time, control the channel selection module to connect the corresponding reference core of the selected core to be tested to the black probe interface of the tester cable through the lower interface of the tester cable;

[0064] S16: Confirm the connection status of the current core to be tested and the reference core, and send a ready signal to the measurement control module;

[0065] S17: After completing the measurement of the current core to be tested, control the channel selection module to disconnect the connection of the measured core and switch to the next group of cores to be tested and reference cores;

[0066] S18: Repeat steps S11 - S17 until the sequential switching of all channels of the cable under test is completed.

[0067] Specifically, connect the cable under test to the upper interface of the cable at the tester end through the upper jumper wire, and at the same time connect it to the lower interface of the cable at the tester end through the lower jumper wire to ensure a reliable connection between the cable under test and the tester. Initialize the channel selection module inside the tester and place all channels in the disconnected state to ensure that no core under test is connected to the tester in the initial state and avoid false measurements. After initialization, select the cores under test of the cable under test in sequence according to the preset test order. The preset of the test order can be formulated according to the actual structure of the cable and the test requirements. For example, it can be carried out in the order from top to bottom or from left to right. After selecting the core under test, control the channel selection module to connect the selected core under test to the red test lead interface at the tester end through the upper interface of the cable at the tester end. At the same time, control the channel selection module to connect the reference core corresponding to the selected core under test to the black test lead interface at the tester end through the lower interface of the cable at the tester end. During the connection process, ensure that the connection status of the current core under test and the reference core is correct. Through the status monitoring function inside the channel selection module, when the correct connection is detected, send a ready signal to the measurement control module, indicating that the current core under test and the reference core are ready for measurement. For example, assume that the cable under test has 10 channels and the core of channel 1 needs to be tested. Select the core of channel 1 as the core under test and connect it to the red test lead interface through the channel selection module. At the same time, select the core of channel 2 as the reference core and connect it to the black test lead interface. After the connection status is confirmed to be correct, the measurement control module receives the ready signal and starts measuring the resistance value of the core of channel 1. After completing the measurement of the current core under test, control the channel selection module to disconnect the connection of the measured core and switch to the next group of cores under test and reference cores. Assume that the next core under test is the core of channel 2. At this time, connect the core of channel 2 as the core under test to the red test lead interface and select the core of channel 3 as the reference core and connect it to the black test lead interface. Repeat this cycle to measure each channel in sequence. Each time the core under test and the reference core are switched, the channel selection module realizes fast and reliable switching through internal control logic to ensure that the measurement of each channel is independent and accurate. To improve the measurement efficiency, use high-speed relays or electronic switches in the channel selection module to quickly complete the connection and disconnection operations. During the entire measurement process, repeat the above steps until the sequential switching and measurement of all channels of the cable under test are completed.

[0068] In a specific embodiment, the process of executing step S104 may specifically include the following steps:

[0069] S21: Receive the ready signal sent by the channel selection module through the measurement control module, and confirm that the current core under test is connected to the red test lead interface and the black test lead interface at the tester end;

[0070] S22: Control the multimeter to enter the resistance measurement mode and enable the automatic range function;

[0071] S23: Trigger the multimeter to measure the resistance value of the current wire core to be measured;

[0072] S24: Receive the driving signals of the liquid crystal display screen of the multimeter in real time through the signal input interface, where the driving signals include resistance value signals, resistance unit signals, decimal point signals, and common terminal signals;

[0073] S25: Convert the received driving signals into standard high and low level signals recognizable by the controller of the tester through the signal conditioning module;

[0074] S26: Analyze the converted signals and extract the complete resistance measurement data, including the value, unit, and decimal point position;

[0075] S27: Associate the resistance measurement data with the channel information of the current wire core to be measured to obtain the original measurement data;

[0076] S28: Store the original measurement data and send a measurement completion signal to the channel selection module to prepare for the measurement of the next channel;

[0077] S29: Repeat steps S21 - S28 until the resistance measurements of all channels of the cable under test are completed.

[0078] Specifically, receive the ready signal sent by the channel selection module through the measurement control module to confirm that the current wire core to be measured is connected to the red test lead interface and black test lead interface of the tester. Control the multimeter to enter the resistance measurement mode and enable the automatic range function. Send control instructions to the multimeter to make it automatically adjust the range to adapt to the resistance value range of the current wire core to be measured, improving the measurement accuracy and efficiency. Trigger the multimeter to measure the resistance value of the current wire core to be measured. Send a trigger signal to the multimeter through the measurement control module, and the multimeter starts to measure the resistance value of the wire core. During the measurement process, receive the driving signals of the liquid crystal display screen of the multimeter in real time through the signal input interface. These signals include resistance value signals, resistance unit signals, decimal point signals, and common terminal signals. These signals are processed by the signal conditioning module to convert the received driving signals into standard high and low level signals recognizable by the controller of the tester. The signal conditioning module adjusts all signals to standard logic levels through a level conversion circuit to eliminate the glitches and interference in the signals. The converted signals are further analyzed and processed to extract the complete resistance measurement data, including the value, unit, and decimal point position. During the analysis process, a specific algorithm is used to combine each signal segment to form the complete resistance information. For example, assume the liquid crystal display driving signal V lcd After decoding, the obtained resistance value signal is V val , the resistance unit signal is V unit , the decimal point signal is Vdp and the common terminal signal V com After these signals are processed, the standard high and low level signals are V val-std ,

[0079] V unit-std , V dp-std and V com-std . The final measured resistance data R can be expressed as:

[0080]

[0081] where n is the displacement representing the decimal point position. Through formula calculation, accurate resistance data is obtained. After extracting the complete measured resistance data, these data are associated with the channel information of the current wire core to be measured to form the original measurement data. The association of the channel information is achieved by reserving specific storage locations for each channel in the data storage structure and storing the measurement data by channel to ensure the orderliness and traceability of the data. After storing the original measurement data, a measurement completion signal is sent to the channel selection module to indicate that the measurement of the current channel is completed and ready to measure the next channel. Repeat the above steps to measure each channel in turn until the resistance measurement of all channels of the cable under test is completed. For example, assume a multi-core cable has N channels. Through the above steps, the measurement control module will switch each channel one by one, connect to the tester and perform resistance measurement. The signal conditioning module is responsible for converting the signal output by the multimeter into a standard high and low level signal, and the data processing module analyzes the signal and stores the measurement result.

[0082] In a specific embodiment, the process of executing step S105 may specifically include the following steps:

[0083] (1) Receive and organize the original measurement data of all wire cores to be measured through the data processing module, where the original measurement data includes channel information and the corresponding measured resistance results;

[0084] (2) Calculate the resistance of each channel according to the original measurement data;

[0085] (3) Evaluate the resistance of each channel according to the preset conduction judgment standard to obtain the conduction state of each channel. At the same time, compare the resistance differences between adjacent channels to judge whether there are short circuits or abnormal connections, and analyze the change trend of the resistance of each channel to identify existing intermittent faults or poor contact problems;

[0086] (4) Generate a cable test report including the resistance and conduction state of each channel, and visually display the cable test report.

[0087] Specifically, the data processing module receives the original measurement data from each channel, and these data include channel information and the corresponding resistance measurement results. Through the storage structure, these data are sorted in an orderly manner to ensure that the measurement results of each channel correspond one by one to its channel information. For the resistance measurement results of each channel, the data processing module determines the actual resistance of each channel through a series of calculations. Assume that the resistance measurement result of each channel in the original measurement data is represented as R i , where i represents the channel number. The data processing module sorts out these measurement results and evaluates the resistance of each channel according to a preset conduction judgment criterion. The conduction judgment criterion is usually based on the threshold range of the resistance. For example, if the resistance R i of a certain channel is less than the preset threshold R th , then it is considered that this channel is conductive, that is, the state is "passed"; otherwise, it is considered that this channel is non-conductive, that is, the state is "not passed". The data processing module judges whether there is a short circuit or abnormal connection situation by comparing the resistance differences between adjacent channels. Assume that the resistances of adjacent channels are R i and R i+1 , if the difference |R i - R i+1 | exceeds a preset difference threshold ΔR th , then there may be a short circuit or abnormal connection situation, and this result will be marked as abnormal and requires further inspection. The data processing module analyzes the resistance change trend of each channel to identify existing intermittent faults or poor contact problems. Assume that during multiple measurements, the resistance R i of a certain channel shows significant fluctuations, that is, the measurement result R i (t) varies greatly with time t, then this channel may have intermittent faults or connections

[0088]

[0089] Among them, is the average value of R i (t), and N is the number of measurements. If σ iIf it exceeds a preset threshold, it indicates that there may be intermittent faults or poor contact problems in that channel. Based on the above analysis results, the data processing module generates a cable test report containing the resistance values and conduction states of each channel. The test report details the resistance measurement results, conduction states, resistance differences between adjacent channels, and the analysis results of the resistance change trend for each channel. After the report is generated, the data processing module visually displays the test results. Through charts and graphical interfaces, the test report presents the measurement data in an intuitive way. For example, a line chart can be used to show the resistance change trend of each channel, the conduction states of each channel are identified by color coding (green indicates pass, red indicates fail), a bar chart is used to show the resistance differences between adjacent channels, and channels with anomalies or intermittent faults are marked with warning signs.

[0090] In a specific embodiment, the process of performing the step of evaluating the resistance value of each channel according to a preset conduction judgment criterion to obtain the conduction state of each channel, and at the same time, comparing the resistance differences between adjacent channels to determine whether there are short - circuit or abnormal connection situations, and analyzing the change trend of the resistance value of each channel to identify existing intermittent faults or poor contact problems can specifically include the following steps:

[0091] (1) Analyze the preset conduction judgment criterion to obtain the upper - limit threshold and lower - limit threshold of the resistance value, and compare the resistance value of each channel according to the upper - limit threshold and lower - limit threshold of the resistance value to obtain a preliminary conduction state judgment result;

[0092] (2) Perform fuzzy - logic processing on the preliminary conduction state judgment result to obtain a corrected conduction state considering measurement errors, and classify all channels according to the corrected conduction state to obtain sets of channels in conduction, disconnection, and suspicious states;

[0093] (3) Repeatedly measure the set of channels in the suspicious state multiple times to obtain the resistance fluctuation range, and perform Bayesian probability analysis on the channels in the suspicious state according to the resistance fluctuation range to obtain a final conduction state judgment result;

[0094] (4) Calculate the difference between the resistance values of adjacent channels to obtain a matrix of resistance differences between channels, and perform clustering analysis on abnormal differences according to the matrix of resistance differences to obtain groups of channels with potential short - circuits or abnormal connections;

[0095] (5) Perform time - series correlation analysis on the groups of channels with potential short - circuits or abnormal connections to obtain the time pattern of fault occurrence, and classify the fault types according to the time pattern to obtain judgment results of persistent faults and intermittent faults;

[0096] (6) Perform time series analysis on the historical resistance value data of each channel to obtain a resistance value change trend curve, and perform wavelet transform on the resistance value change trend curve to obtain the resistance value fluctuation characteristics at different scales;

[0097] (7) Perform pattern recognition on the resistance value fluctuation characteristics to obtain the classification results of normal fluctuations, gradual change trends, and mutation points, and perform linear regression analysis on the gradual change trends according to the classification results to obtain the resistance value change rate;

[0098] (8) Perform cluster analysis on the mutation points to obtain the potential intermittent fault occurrence time points, and perform comprehensive evaluation based on the resistance value change rate and the intermittent fault time points to obtain the cable aging degree and the fault risk level;

[0099] (9) Perform weighted fusion on the conduction state, short circuit judgment, and fault risk level to obtain the comprehensive health index of each channel.

[0100] Specifically, analyze the preset conduction judgment criteria to obtain the upper resistance value threshold R max and the lower threshold R min . These two thresholds are usually determined by actual engineering experience or test specifications and are used to determine the conduction state of the cable channel. By comparing the measured resistance value R i of each channel with R max and R min for preliminary judgment, if R min ≤R i ≤R max , it is initially considered that this channel is conductive, otherwise it is considered disconnected or suspicious. Perform fuzzy logic processing on the preliminary conduction state. Considering the errors in actual measurement, correct the resistance value judgment results of each channel. Assume the measurement error is ΔR, then through the introduction of fuzzy sets and membership functions in fuzzy logic processing, obtain the corrected conduction state of each channel. The corrected conduction state is used for further classification to obtain the channel sets of conductive, disconnected, and suspicious states. For the channels in the suspicious state, obtain the fluctuation range of the resistance value through multiple repeated measurements. Assume the resistance value results of multiple measurements are R i1 ,R i2 ,…,R in , then the fluctuation range can be represented by the standard deviation σ i . Use Bayesian probability analysis, based on the measured fluctuation range, combined with the prior probability, to obtain the final conduction state judgment result. The formula for Bayesian analysis is:

[0101]

[0102] Among them, P(H|D) is the posterior probability that hypothesis H holds under the observed data D, P(D|H) is the probability of observing data D when hypothesis H holds, P(H) is the prior probability that hypothesis H holds, and P(D) is the total probability of observing data D. Calculate the difference between the resistance values of adjacent channels to obtain the resistance value difference matrix between channels. Assume that the resistance values of channels i and j are R i and R j , then the element of the difference matrix ΔR ij =|R i -R j |. According to the resistance value difference matrix, identify abnormal differences through cluster analysis to obtain a group of channels with potential short circuits or abnormal connections. For the identified group of channels with potential short circuits or abnormal connections, perform time series correlation analysis to obtain the time pattern of the fault occurrence. Time series analysis determines whether the fault type is a persistent fault or an intermittent fault by observing the law of the resistance value changing with time. For example, if the resistance value change shows periodic fluctuations, it may indicate an intermittent fault; if the resistance value continuously increases or decreases, it may be a persistent fault. Through time series analysis, analyze the historical resistance value data of each channel to obtain the resistance value change trend curve. Assume that the sequence of the resistance value changing with time is R(t), and use wavelet transform to extract the resistance value fluctuation characteristics at different scales. The wavelet transform formula is:

[0103]

[0104] Among them, W(a,b) is the wavelet coefficient, a and b are the scale and translation parameters respectively, ψ is the mother wavelet function

[0105] , and ψ is its conjugate complex number. Through pattern recognition, classify the resistance value fluctuation characteristics to obtain normal fluctuations, gradual change trends, and mutation points. Perform linear regression analysis on the gradual change trend to obtain the resistance value change rate k, and its formula is:

[0106]

[0107] Among them, t i is the time point, R i is the corresponding resistance value, and are the average values of time and resistance value respectively. Perform cluster analysis on the mutation points to identify the time points of potential intermittent fault occurrences. Combine the resistance value change rate and the time points of intermittent faults to comprehensively evaluate the cable aging degree and the fault risk level. According to the evaluation results, obtain the cable aging degree and the fault risk level of each channel. Weightedly fuse the conduction state, short circuit judgment, and fault risk level to obtain the comprehensive health index of each channel. Assume that the weight of the conduction state is w1, the weight of the short circuit judgment is w2, and the weight of the fault risk level is w3. The comprehensive health index H can be expressed as:

[0108] H = w1·S conduct + w2·S short + w3·S risk ;

[0109] Wherein, S conduct is the conduction state score, S short is the short - circuit judgment score, S risk is the fault risk level score.

[0110] The online measurement type multi - channel cable conduction test method in the embodiment of the present application is described above. Next, the online measurement type multi - channel cable conduction test device in the embodiment of the present application will be described. Please refer to Figure 2 , an embodiment of the online measurement type multi - channel cable conduction test device in the embodiment of the present application includes:

[0111] Tester 1, including the upper - end interface 5 of the tester - end cable, the lower - end interface 6 of the tester - end cable, the red - pen interface 2 of the tester - end, the black - pen interface 4 of the tester - end, and the signal input interface 3 of the tester - end; the tester 1 further includes a channel selection module for controlling the conduction between the cable core and the red - pen interface 2 or the black - pen interface 4 of the tester - end; Multimeter 8, including the red - pen interface 7 of the multimeter - end, the black - pen interface 9 of the multimeter - end, and the signal output interface 11 of the multimeter - end; Red - pen connecting wire 15 for connecting the red - pen interface 7 of the multimeter - end and the red - pen interface 2 of the tester - end; Black - pen connecting wire 16 for connecting the black - pen interface 9 of the multimeter - end and the black - pen interface 4 of the tester - end; Signal connecting wire 10 for connecting the signal output interface 11 of the multimeter - end and the signal input interface 3 of the tester - end; Upper - end jumper wire 12 for connecting the cable under test 14 and the upper - end interface 5 of the tester - end cable; Lower - end jumper wire 13 for connecting the cable under test 14 and the lower - end interface 6 of the tester - end cable.

[0112] It should be noted that the online measurement type multi - channel cable conduction test device uses the tester as the main controller and the multimeter as the resistance measurement instrument. By designing the data output device at the multimeter - end and the data input and conditioning device at the tester - end, the tester can realize the real - time acquisition of the multimeter data. At the same time, with the channel switching function of the tester, the online measurement type multi - channel cable conduction test function can be realized.

[0113] Through the collaborative cooperation of the above - mentioned components, by decoding the driving signal of the multimeter liquid crystal screen, the real - time reading of the multimeter measurement result is realized. By combining the real - time acquisition function of the multimeter measurement result with the multi - channel measurement and control system, the online measurement type multi - channel cable conduction test device is designed, realizing the synchronous control and measurement of the measurement and control system and the multimeter, and improving the accuracy and versatility of the cable conduction measurement device.

[0114] The present application also provides an online measuring multi-channel cable continuity test device for a multimeter. The online measuring multi-channel cable continuity test device for a multimeter includes a memory and a processor. Computer-readable instructions are stored in the memory. When the computer-readable instructions are executed by the processor, the processor is caused to execute the steps of the online measuring multi-channel cable continuity test method for a multimeter in the above respective embodiments.

[0115] The present application also provides a computer-readable storage medium. The computer-readable storage medium may be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium. Instructions are stored in the computer-readable storage medium. When the instructions are run on a computer, the computer is caused to execute the steps of the online measuring multi-channel cable continuity test method for a multimeter.

[0116] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems, systems, and units can refer to the corresponding processes in the foregoing method embodiments and will not be described herein again.

[0117] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disc that can store program codes.

[0118] As described above, the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A multi-channel cable continuity test method using a multimeter online measurement, characterized in that: The method comprises: The tester and the multimeter are electrically connected, the LCD screen drive signal of the multimeter is decoded and transferred through the signal processing module, and the real-time digital signal is output through the signal output interface; Conditioning and converting the real-time digital signal through a signal conditioning module to obtain standard high and low level signals that can be recognized by the controller of the tester; The multiple channels of the tested cable are sequentially switched through the channel selection module to obtain the tested wire cores which are sequentially connected to the red test lead interface and the black test lead interface of the tester end; The multimeter is triggered to measure the resistance of each switched wire core to be tested through the measurement control module, and the measurement results are collected through the signal input interface to obtain the original measurement data of the corresponding wire core to be tested; The original measurement data of all the tested cores are analyzed and judged by the data processing module to obtain a cable test report including the resistance and conduction status of each channel; specifically, the process includes: receiving and collating the original measurement data of all the tested cores by the data processing module, wherein the original measurement data includes channel information and corresponding resistance measurement results; calculating the resistance of each channel according to the original measurement data; evaluating the resistance of each channel according to a preset conduction judgment standard to obtain the conduction status of each channel, and at the same time, comparing the resistance difference between adjacent channels to determine whether there is a short circuit or abnormal connection, and analyzing the change trend of the resistance of each channel to identify Intermittent faults or poor contact problems exist; wherein: the preset conduction judgment standard is parsed to obtain the upper and lower resistance thresholds, and the resistance of each channel is compared according to the upper and lower resistance thresholds to obtain a preliminary conduction state judgment result; the preliminary conduction state judgment result is subjected to fuzzy logic processing to obtain a modified conduction state considering the measurement error, and all channels are classified according to the modified conduction state to obtain a channel set of conduction, disconnection and suspicious states; the channel set of suspicious states is repeatedly measured multiple times to obtain the resistance fluctuation range, and the suspicious state channels are classified according to the resistance fluctuation range. Yes probability analysis is performed to obtain the final conduction state judgment result; the resistance values ​​of adjacent channels are calculated to obtain the resistance difference matrix between channels, and the abnormal differences are clustered according to the resistance difference matrix to obtain the channel group with potential short circuit or abnormal connection; the channel group with potential short circuit or abnormal connection is analyzed for time series correlation to obtain the time mode of fault occurrence, and the fault type is classified according to the time mode to obtain the judgment result of continuous fault and intermittent fault; the historical resistance data of each channel is analyzed for time series to obtain the resistance change trend curve, and the wavelet transform is performed according to the resistance change trend curve to obtain the resistance at different scales Fluctuation characteristics; perform pattern recognition on the resistance fluctuation characteristics to obtain the classification results of normal fluctuation, gradual trend and mutation point, and perform linear regression analysis on the gradual trend based on the classification results to obtain the resistance change rate; perform cluster analysis on the mutation points to obtain the potential time point of intermittent fault occurrence, and perform a comprehensive evaluation based on the resistance change rate and the intermittent fault time point to obtain the cable aging degree and fault risk level; perform weighted fusion on the conduction state, short circuit judgment and fault risk level to obtain the comprehensive health index of each channel; generate a cable test report containing the resistance and conduction state of each channel, and visualize the cable test report.

2. The multi-channel cable continuity test method using a multimeter online measurement method according to claim 1, characterized in that: The tester and the multimeter are electrically connected, the LCD screen drive signal of the multimeter is decoded and transferred through the signal processing module, and the real-time digital signal is output through the signal output interface, including: Connect the red and black test leads of the multimeter to the red and black test lead interfaces of the tester through connecting wires respectively; Connecting the signal output interface of the multimeter to the signal input interface of the tester via a signal connecting line; Connect the tested cable to the upper and lower interfaces of the cable at the tester through the upper and lower jumper wires respectively; Decoding the driving signal of the LCD screen driving signal of the multimeter through the signal processing module, transferring the signal line corresponding to the resistance result display, including the resistance value signal, the resistance unit signal, the decimal point signal and the common terminal signal, from the main control chip of the multimeter to the signal output interface; A real-time digital signal including resistance value, unit, and decimal point position is output through the signal output interface.

3. The multi-channel cable continuity test method using a multimeter online measurement method according to claim 2, characterized in that: The real-time digital signal is conditioned and converted by the signal conditioning module to obtain standard high and low level signals recognizable by the controller of the tester, including: Receiving, by a signal conditioning module, a real-time digital signal output by the multimeter through the signal output interface, wherein the real-time digital signal includes a high-level signal, a low-level signal, a first signal, and a second signal; Identifying high level and low level signals in the real-time digital signal; Analyze the first signal and the second signal, and convert the first signal and the second signal into corresponding high-level or low-level signals; All signals are uniformly adjusted to a standard logic level recognizable by the controller of the tester through a level conversion circuit, and glitches and interferences existing in all signals are eliminated; The processed signal is reshaped into a regular square wave signal, ensuring that the rising edge and falling edge of the regular square wave signal meet the recognition requirements of the controller of the tester, and outputting conditioned and converted standard high and low level signals.

4. The multi-channel cable continuity test method using a multimeter online measurement method according to claim 3, characterized in that: The method sequentially switches multiple channels of the tested cable through the channel selection module to obtain the tested wire cores sequentially connected to the red test lead interface and the black test lead interface of the tester end, including: S11: The tested cable is connected to the upper interface of the cable at the tester end through the upper jumper wire, and is connected to the lower interface of the cable at the tester end through the lower jumper wire; S12: Initializing the channel selection module inside the tester to put all channels into a disconnected state; S13: Select the wire cores to be tested of the tested cable in turn according to the preset test sequence; S14: Control the channel selection module to connect the selected wire core to be tested to the red test lead interface at the tester end through the upper end interface of the cable at the tester end; S15: simultaneously controlling the channel selection module to connect the reference core corresponding to the selected core to be tested to the black test lead interface at the tester end through the lower end interface of the cable at the tester end; S16: confirm the connection status of the current test core and the reference core, and send a ready signal to the measurement control module; S17: After completing the measurement of the current core to be tested, controlling the channel selection module to disconnect the measured core and switch to the next group of cores to be tested and reference cores; S18: Repeat steps S11-S17 until the sequential switching of all channels of the tested cable is completed.

5. The multi-channel cable continuity test method using a multimeter online measurement method according to claim 4, characterized in that: The method triggers a multimeter to measure the resistance of each switched wire core to be tested through the measurement control module, and collects the measurement results through the signal input interface to obtain the original measurement data of the corresponding wire core to be tested, including: S21: receiving a ready signal sent by the channel selection module through the measurement control module, and confirming that the current wire core to be tested has been connected to the red test lead interface and the black test lead interface of the tester end; S22: Control the multimeter to enter resistance measurement mode and enable the auto-range function; S23: trigger the multimeter to measure the resistance of the current wire core to be tested; S24: receiving a driving signal of a liquid crystal screen of a multimeter in real time through a signal input interface, wherein the driving signal includes a resistance value signal, a resistance unit signal, a decimal point signal and a common terminal signal; S25: converting the received driving signal into standard high and low level signals recognizable by the controller of the tester through the signal conditioning module; S26: parsing the converted signal to extract complete resistance measurement data, including numerical value, unit and decimal point position; S27: Associating the resistance measurement data with the channel information of the current wire core to be tested to obtain original measurement data; S28: storing the original measurement data, and sending a measurement completion signal to the channel selection module, preparing to measure the next channel; S29: Repeat steps S21-S28 until the resistance measurement of all channels of the tested cable is completed.

6. A multi-channel cable continuity test device with online measurement using a multimeter, characterized in that: The device is used to perform the multi-channel cable continuity test method of online measurement by a multimeter according to any one of claims 1 to 5, the device comprising: The tester (1) comprises an upper cable interface (5) at the tester end, a lower cable interface (6) at the tester end, a red test lead interface (2) at the tester end, a black test lead interface (4) at the tester end, and a signal input interface (3) at the tester end; the tester (1) also comprises a channel selection module for controlling the conduction between the cable core and the red test lead interface (2) at the tester end or the black test lead interface (4) at the tester end; a multimeter (8) comprises a red test lead interface (7) at the multimeter end, a black test lead interface (9) at the multimeter end, and a signal output interface (11) at the multimeter end; a red test lead connecting line (1 5), used to connect the red probe interface (7) at the multimeter end and the red probe interface (2) at the tester end; the black probe connection line (16), used to connect the black probe interface (9) at the multimeter end and the black probe interface (4) at the tester end; the signal connection line (10), used to connect the signal output interface (11) at the multimeter end and the signal input interface (3) at the tester end; the upper end jumper line (12), used to connect the tested cable (14) and the upper end cable interface (5) at the tester end; the lower end jumper line (13), used to connect the tested cable (14) and the lower end cable interface (6) at the tester end.

7. A multimeter online measurement multi-channel cable continuity test device, characterized in that: The multimeter online measurement type multi-channel cable continuity test device comprises: a memory and at least one processor, wherein instructions are stored in the memory; The at least one processor calls the instructions in the memory to enable the multimeter online measurement multi-channel cable continuity test device to execute the multimeter online measurement multi-channel cable continuity test method according to any one of claims 1 to 5.

8. A computer-readable storage medium having instructions stored thereon, characterized in that: When the instructions are executed by the processor, the multimeter online measurement type multi-channel cable continuity test method according to any one of claims 1 to 5 is implemented.

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