A remote calibration system for cable analyzers

Abstract

The present invention belongs to the technical field of cable detection, and specifically is a remote calibration system for a cable analyzer, wherein the on-site glasses end includes an information collection module, an operation guidance module, a work order viewing module and a remote link module, the remote expert mobile end includes an order dispatching module and a remote assistance module, and the background management system includes an account management module, a work order management module and a call management module; the server is used to store information generated by the on-site glasses end, the remote expert mobile end and the background management system, as well as step-by-step operation guidance instructions; the cable analyzer remote calibration system includes three ends: the on-site glasses end, the remote expert mobile end and the background management system, which can improve the calibration and testing efficiency of on-site executors, and at the same time, experts can remotely supervise and guide online in real time, and download data reports in the background, so as to ensure the high efficiency, safety and compliance of on-site task execution.

Description

Technical Field

[0001] The present invention relates to the technical field of cable detection, and in particular to a remote calibration system for a cable analyzer. Background Art

[0002] Cables are mainly used for signal transmission. During use, their physical characteristics and electrical performance have certain requirements. Therefore, cables need to be subjected to various tests during use to detect whether their performance is normal and meets the use requirements. The test contents generally include open circuit, short circuit, wiring error, insulation performance, voltage resistance performance, attenuation and crosstalk, etc. With the development of hardware technology and software technology, all detection methods tend to use various testers for comprehensive testing.

[0003] At the current stage, cable detection still requires the use of a cable analyzer to detect the cables. In order to ensure the accuracy of the cable analyzer's detection results, the cable analyzer needs to be calibrated before use. Since the calibration method of the cable analyzer and the connection method between the cable analyzer and the cable are relatively complicated, workers need to undergo long-term pre-job training. Even so, workers may still have problems such as unskilled operation and operational errors in actual operations due to lack of inquiry and guidance. Therefore, a remote monitoring system is needed to provide operational guidance on the calibration of the cable analyzer and the line connection method. Summary of the invention

[0004] The object of the present invention is to provide a cable analyzer remote calibration system to solve the problem in the above background technology that workers cannot remotely contact experts when using a cable analyzer.

[0005] To achieve the above object, the present invention provides the following technical solutions: a cable analyzer remote calibration system, comprising an on-site glasses terminal, a remote expert mobile terminal, a background management system and a server, wherein the on-site glasses terminal comprises an information collection module, an operation guidance module, a work order viewing module and a remote link module, the remote expert mobile terminal comprises a dispatching module and a remote assistance module, and the background management system comprises an account management module, a work order management module and a call management module;

[0006] The server is used to store information generated by the on-site glasses terminal, the remote expert mobile terminal and the backend management system, as well as step-by-step operation instructions;

[0007] The information collection module is used to collect image information and language information generated by workers when they are working;

[0008] The operation guidance module is used to view the step-by-step operation guidance instructions stored in the server;

[0009] The work order viewing module is used to receive and view the task work orders sent by the remote expert mobile terminal;

[0010] The remote link module is used for interaction between the on-site glasses terminal and the remote expert mobile terminal.

[0011] The dispatching module is used to generate a task work order and dispatch the task work order to the on-site glasses end;

[0012] The remote assistance module is used to remotely control the on-site glasses.

[0013] The account management module is used to manage accounts, including account creation, deletion, modification and search;

[0014] The work order management module is used to record the information of the task work order and generate a PDF report;

[0015] The call management module is used to record the interaction information between the field glasses terminal and the remote expert mobile terminal, and generate a screen recording file.

[0016] Preferably, the step-by-step operation instructions stored in the server include audio, video and AR 3D animation.

[0017] Preferably, the server further comprises an expansion module, and the expansion module is used for linking the server with external calibration equipment.

[0018] Preferably, the remote link module includes a call module, a conversation module, an assistance module and a screen recording module;

[0019] The calling module is used to call an expert;

[0020] The call module is used to make a video call with the expert;

[0021] The assistance module is used to switch the guidance mode;

[0022] The screen recording module is used to trigger the information collection module to collect image information and language information.

[0023] Preferably, the remote link module further includes a contact selection module and an on-the-job marking module;

[0024] The contact selection module is used to arrange the list of experts;

[0025] The on-the-job marking module is used to mark whether the experts arranged in the contact selection module are online, and to prioritize the list of online experts.

[0026] Preferably, the remote assistance module includes a confirmation module and an assistance module;

[0027] When the confirmation module is triggered, the remote connection module and the remote assistance module begin to exchange information;

[0028] The assistance module is used to judge the information collected by the information collection module and transmit a guidance message to the remote link module.

[0029] Preferably, the dispatch module further includes a contact screening module and a note module;

[0030] The contact screening module is used to screen the online employee list and arrange the online employee list;

[0031] The remarks module is used to mark the order acceptance status of the online employee list and the distance between the online employee and the calibration location.

[0032] Preferably, the background management system further includes a download module and an upload module;

[0033] The download module is used to download the information stored in the server;

[0034] The upload module is used to prepare the information downloaded in the download module into step-by-step operation instructions, and upload the step-by-step operation instructions to the server.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1) The cable analyzer remote calibration system includes three terminals: the on-site glasses terminal, the remote expert mobile terminal and the back-end management system. It can improve the calibration and testing efficiency of on-site executors. At the same time, experts can remotely supervise and guide online in real time and download data reports in the back-end to ensure the efficiency, safety and compliance of on-site task execution;

[0037] 2) The on-site glasses are operated by wearing glasses, which not only frees up hands, but also transmits the on-site images in real time from a first-person perspective to the remote expert's mobile terminal. The expert can choose to give precise guidance to the on-site personnel, thereby minimizing misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is the main flow chart of the system of the present invention;

[0039] Figure 2 This is a system architecture diagram of the present invention;

[0040] Figure 3 This is a schematic diagram of the connection of the DC loop resistance for the mainframe calibration of the network cable analyzer of the present invention;

[0041] Figure 4This is a schematic diagram of simultaneous measurement connection between the host and remote end of the network cable analyzer of the present invention;

[0042] Figure 5 This is a schematic diagram of the connection between the two ends of the stabilizing cable calibrated by a network analyzer in the present invention;

[0043] Figure 6 A schematic diagram of a network cable analyzer host calibrating near-end crosstalk between two groups of wire pairs;

[0044] Figure 7 This is a schematic diagram of the connection of using a network analyzer to calibrate the near-end crosstalk between two pairs of wires of an auxiliary cable in the present invention;

[0045] Figure 8 This is a schematic diagram of the connection of the insertion loss of a group of line pairs of a simulator or an auxiliary cable using a network analyzer for calibration in the present invention;

[0046] Fig. 9 This is a schematic diagram of the far-end crosstalk connection between two pairs of wires of a simulator or auxiliary cable using a network analyzer for calibration in the present invention;

[0047] Fig.10 A schematic diagram of the present invention using a network cable analyzer to measure the far-end crosstalk connection between two pairs of wires of an ELFEXT simulator or an auxiliary cable;

[0048] Fig.11 This is a connection diagram of calibrating the return loss value using a network analyzer in the present invention;

[0049] Fig.12 This is a connection diagram of calibrating the return loss value using a network analyzer host in the present invention;

[0050] Fig.13 This is a schematic diagram of the network cable analyzer and remote simultaneous measurement connection of the present invention;

[0051] Fig.14 This is a schematic diagram of simultaneous measurement connection between the host and remote end of the network cable analyzer of the present invention;

[0052] Fig.15 Insertion loss measurement results of the network analyzer and network cable tester of the present invention;

[0053] Fig.16 The insertion loss measurement results of the network analyzer and network cable tester of the present invention (the attenuation value of the standard device is set to 5dB);

[0054] Fig.17 The insertion loss measurement results of the network analyzer and network cable tester of the present invention (the attenuation value of the standard device is set to 10dB);

[0055] Fig.18The insertion loss measurement results of the network analyzer and network cable tester of the present invention (the attenuation value of the standard device is set to 20dB);

[0056] Fig.19 The insertion loss measurement results of the network analyzer and network cable tester of the present invention (the attenuation value of the standard instrument is set to 30dB). DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0059] Example:

[0060] See also Figure 1-19 The present invention provides a technical solution: a cable analyzer remote calibration system, including an on-site glasses terminal, a remote expert mobile terminal, a background management system and a server. The cable analyzer remote calibration system includes three terminals: an on-site glasses terminal, a remote expert mobile terminal and a background management system, aiming to improve the calibration test efficiency of on-site executors. At the same time, experts can remotely supervise and guide online in real time, and download data reports in the background, so as to ensure the efficient, safe and compliant execution of on-site tasks.

[0061] The on-site glasses end includes an information collection module, an operation guidance module, a work order viewing module and a remote link module. The on-site glasses end is installed in Rokid glasses. Rokid Glass 2 is a foldable AR glasses with a light and thin appearance, powerful performance, clear AR display, voice + touch dual interaction, and powerful expansion capabilities. It is suitable for exhibitions, industry, education and other scenarios. At the same time, it can calibrate the online employees on site to wear glasses to operate, and it can also free their hands. The login of the on-site glasses end requires entering the account and password. The home page displays four function buttons: contacts, call records, operation guidance, and task work orders. Click the contact button on the home page to enter the contact page. Select a contact to enter the call page and call the contact. Click the call record button on the home page to enter the call record page. Click the "Operation Guidance" button on the home page to enter the operation guidance page. ; This page displays the operation instructions step by step, including videos, 3D animations, etc. The video can be paused; click the "Previous Step" and "Next Step" buttons to switch steps. AR recognition page: the paper manual can be recognized by the camera, and the instrument equipment model is projected on the paper manual. The operation steps are intuitively displayed in an immersive 3D animation. When there is a new task work order, a small red dot prompt is given in the upper right corner of the icon; 5 minutes before the start of the work order, a prompt is given at the top of the homepage. Click the "Enter" button to enter the work order details page. When the work order execution time arrives, a pop-up prompt will appear on the page. Click the "Enter" button to enter the work order details page. Click the "Task Work Order" button on the homepage to enter the work order list Table page; the list shows the task work orders assigned to me, and only shows the work orders to be executed and in progress; work order status definition: the work order status before the start time is: to be executed; the work order status when the start time is reached is: in progress; the work order status that has been normally executed is: ended (whether it is normally executed is determined by the expert); the work order that has been executed but not calibrated normally can be forcibly closed by the expert, and its status will be changed to: closed after closing; click on a work order to enter the work order details page; work order details page: click "start execution" to enter the call page to call the dispatch expert; after the expert is connected, enter the video call page and automatically start screen recording; you can turn on mute, initiate screen freeze, and view Text message, file reading, end meeting; click the "Initiate Freeze Screen" button, and the camera image will be shared to other terminals; Freeze screen annotation page: click the "Freeze Screen" button to freeze the current image, and the remote expert mobile terminal expert can draw annotations on the still image to give guidance, and the glasses terminal will view it; the expert terminal clicks the "Guide" button, and a step-by-step operation panel will appear in the upper left corner of the on-site glasses terminal; the expert terminal will judge the result of each operation of the on-site glasses terminal: if the expert terminal clicks "Finish", the glasses terminal will display a correct "√"; if the expert terminal clicks "Redo", the glasses terminal will display an incorrect "×"; if the first step is correct, it will proceed to the second step; for incorrect operations, a prompt to re-operate will be given at the same time;When each step is completed normally, a PDF report will be generated and can be downloaded in the background;

[0062] The remote expert mobile terminal includes the dispatch module and the remote assistance module. As a mobile terminal, the remote expert mobile terminal is made into an APP and installed on the mobile phone, so that online employees can contact timely experts. After the remote expert mobile terminal requires an account and password to log in, 4 tabs are displayed at the bottom, namely contacts, call records, task tickets, and mine. Select a contact and click the call button to enter the call page. After the call ends, the call record page will record it; Task ticket page: Display the list of tickets created by the person, including time, subject and status. Click the "Create Ticket" button to enter the create ticket page, and click the ticket list to enter the ticket details page; Create page: Enter the subject, select the start time of the ticket, enter the task location, select the equipment, enter the equipment model, select the executor of the ticket, enter the task description, and you can create the ticket; Ticket details: Display the ticket details. For tickets that have not yet reached the start time, they can be modified and canceled; for tickets that have reached the execution time, you can click the "Call" button to call the executor for online audio and video communication. For abnormal tickets or special tickets, experts can choose Forced closure; Work records can be added to work orders; For completed work orders, the generated PDF report can be seen; After the expert establishes contact with the on-site work order executor, a video call will be initiated; Both parties can send and receive files, send text messages, start video recording, and invite other users in the contact list to join. The on-site glasses end switches to the freeze screen annotation mode, and the expert can see the on-site end screen. You can choose to click the freeze screen button to freeze the current screen, and then draw annotations on the still screen for communication and guidance. The expert clicks the "Guide" button, and a step-by-step operation guidance panel will pop up on both sides of the page; For each step of the on-site end, the expert end can manually judge. If it is correct, click the Finish button, and if it is wrong, click the Redo button. Only when the first step is correct can the second step be entered; If all steps are completed correctly on the on-site end, the work order will be executed normally; After the work order is executed normally, the expert can view the calibration PDF report in the "Received Files" folder in the upper right corner, and the PDF report can also be downloaded in the background. Click "Instructions for Use" in "My Page" to enter the Instructions for Use page; Step-by-step instructions for using the expert end APP;

[0063] The backend management system includes an account management module, a work order management module and a call management module. The information stored in the server is managed through the backend management system. The backend management system also requires the account and password to log in. After a successful login, three function buttons are displayed on the left side of the page, namely: account management, work order management, and call management; Account management: including account information list display, account activation, editing, deletion, search, and status modification; Work order management: including work order information list display, work order search, work order detail view, calibration data PDF download corresponding to the work order, and work record view submitted by the expert. One work order may correspond to multiple PDF reports, which are displayed in a list format; Call management: including call record list display, call record search, call detail view, download and view of the screen recording file of this call, the screen recording file can be downloaded or deleted, and each call record in the list also displays the work order number associated with it. One work order may correspond to multiple call records;

[0064] The server is used to store information generated by the on-site glasses terminal, the remote expert mobile terminal and the backend management system, as well as step-by-step operation instructions;

[0065] The information collection module is used to collect image information and language information generated by workers when they are working, including video information and voice information when experts have video calls with online employees, and video information of online employees' operation processes when experts guide online employees;

[0066] The operation guidance module is used to view the step-by-step operation guidance instructions stored in the server. When online employees are not proficient in operation, they can view the information in the step-by-step operation guidance instructions to understand the operation steps. The step-by-step operation guidance instructions include audio, video and AR 3D animation;

[0067] The work order viewing module is used to receive and view the task work orders assigned by the remote expert's mobile terminal. Online employees can view the task work orders assigned to them through the work order viewing module;

[0068] The remote link module is used for the interaction between the on-site glasses end and the remote expert mobile end. The remote link module includes a call module, a conversation module, an assistance module and a screen recording module. When an online employee needs the help of an expert, he can call the expert through the call module. When the expert is connected, the online employee makes a video call in the conversation module. The expert guides the online employee through the video call. At the same time, the screen recording module triggers the information collection module. The information collection module starts to collect image information and language information. When the problem cannot be solved through the video call, the online employee can switch to the guidance mode through the assistance module. At this time, the online employee will share his own operation process screen to the expert mobile end in real time. At the same time, the expert mobile end starts to remotely control the on-site glasses end. The remote link module also includes a contact selection module and an on-the-job marking module. The contact selection module is used to arrange the expert list, so that it is convenient for online employees to choose different experts for help. At the same time, the on-the-job marking module is used to mark whether the arranged experts are online, so that it is convenient for online employees to find experts who can be consulted in time. At the same time, the online expert list is prioritized, so that it is convenient for online employees to quickly find online experts;

[0069] The dispatching module is used to convert the instrument calibration task into a task work order, and then the expert distributes the task work order to the online employees at the on-site glasses end. The dispatching module also includes a contact screening module and a note module. In order to facilitate the experts to reasonably distribute the task work order, the contact screening module is used to screen the employee list and eliminate the employees who are not online. At the same time, the note module is used to mark the order acceptance status of the online employee list and the distance between the online employee and the calibration location;

[0070] The remote assistance module is used to remotely control the on-site glasses. The remote assistance module includes a confirmation module and an assistance module. When an online employee calls an expert, the confirmation module of the remote expert's mobile terminal will pop up a confirmation option. When the expert agrees to the online employee's call request, the remote link module and the remote assistance module begin to exchange information. At this time, the online employee can make a video call with the employee. When the online employee switches to the guidance mode, the expert's mobile terminal begins to remotely control the on-site glasses. At this time, the assistance module can judge the information collected by the information collection module and transmit guidance messages to the remote link module, including judging the online employee's operation process, marking the frozen screen, transferring files to the online employee, sending text messages, etc., thereby guiding the online employee.

[0071] The account management module is used to manage accounts, including account creation, deletion, modification and search; the work order management module is used to record the information of task work orders and generate PDF reports; the call management module is used to record the interaction information between the on-site glasses end and the remote expert mobile end, and generate screen recording files.

[0072] The server also includes an expansion module, which is used to link the server with external calibration equipment, so as to obtain the calibration data of online employees.

[0073] The backend management system also includes a download module and an upload module. The download module is used to download information stored in the server, including audio information and video information, so as to facilitate the inspection of the expert's guidance content and the employee's operating procedures. In addition, the audio and video of the correct operating procedures of online employees can be made into step-by-step operating instructions, and the step-by-step operating instructions can be uploaded to the server for the convenience of other online employees to view.

[0074] Appendix 1: Operation Instructions:

[0075] Operation Instructions – First Step;

[0076] Equipment information recording and working normality inspection:

[0077] Preparation: Take screenshots of all the module and instrument factory numbers one by one;

[0078] Operational instructions – Step 2;

[0079] DC loop resistance test:

[0080] 2.1. The main unit of the network cable analyzer can work independently;

[0081] a) Use a twisted pair cable with an RJ45 plug on one end (the length must not exceed 0.1m, the shorter the better), and select a set of line pairs at the other end, such as 3-6 line pairs (the eight test lines of the network cable analyzer are divided into four groups of line pairs, namely: 1-2, 3-6, 4-5, 7-8 line pairs). Figure 3 Connected to a DC resistance box as shown;

[0082] b) The network cable analyzer is set to the manual DC loop resistance measurement function, and the standard value R of the DC resistance box is adjusted from small to large according to the standard value recorded in the prior art. 0 , read the indication value R of the network cable analyzer in turn;

[0083] c) Use other wire pairs to connect the DC resistance box and repeat a) and b);

[0084] 2.2. The main unit of the network cable analyzer must work together with the remote end;

[0085] a) Use a DC resistance meter to calibrate the DC resistance standard value R0 of each line pair of a stable cable using the four-wire method;

[0086] b) Press Figure 4 Connect the network cable analyzer and the stable cable;

[0087] c) The network cable analyzer uses the DC loop resistance measurement function to read the indicated value R;

[0088] d) Use stable cables with different DC resistance values ​​and repeat the above measurements;

[0089] Operation Instructions – Step 3;

[0090] Propagation delay test;

[0091] 3. Propagation delay;

[0092] a) Press Figure 5 As shown, the network analyzer is connected through two impedance converters, and the two impedance converters are connected with a short jumper to perform a through calibration of the group delay;

[0093] b) Press Figure 5 As shown, the network analyzer and the 3-6 line pairs of the stable cable are connected through two impedance converters. The stable cable is measured with the network analyzer to read the propagation delay value T at the 10MHz frequency point. 0 ;

[0094] c) Press Figure 4 Connect the network cable analyzer and the stable cable;

[0095] d) Operate the network cable analyzer to measure the propagation delay of the stable twisted pair cable and read the propagation delay value T of the 3-6 line pairs;

[0096] e) Repeat the above measurements using stable cables of different lengths according to the standard values ​​recorded in the prior art and record the corresponding data;

[0097] Operation Instructions – Step 4;

[0098] Insertion loss test:

[0099] 4. Insertion loss;

[0100] a) Press Figure 5 As shown, the network analyzer is connected through two impedance converters, and the two impedance converters are connected with a short jumper to perform a through calibration amplitude;

[0101] b) Press Figure 5 As shown, connect the network analyzer and the 3-6 line pairs of the 100m stable cable through two impedance converters, measure the stable cable with the network analyzer, and read the insertion loss value A at the frequency point to be measured;

[0102] c) Use a network cable analyzer to Figure 4 As shown, measure a 100m stable cable and read the insertion loss value A of each line pair at the frequency point to be measured;

[0103] c) Repeat b) and use a network analyzer to measure and read the insertion loss value A at other line pairs and frequency points;

[0104] Operation Instructions – Step 5;

[0105] 5. Near-end crosstalk test:

[0106] 5.1. The main unit of the network cable analyzer can work independently;

[0107] a) Instrument connection Figure 6 As shown;

[0108] b) Use a network cable analyzer to Figure 6 As shown, select the corresponding crosstalk line pair, connect it to the coaxial step attenuator through the impedance converter (the unused port of the impedance converter is connected to a 50Ω load), set the attenuator to 0dB, and read the near-end crosstalk value N of the network cable analyzer at the required frequency point. 1 , change the attenuation value of the coaxial step attenuator and read the new near-end crosstalk value N at this frequency point from the network cable analyzer 2 , according to the formula N = N 2 -N 1 Calculate the near-end crosstalk value N at the frequency point; (where: N represents the near-end crosstalk measurement value, in dB; N 1 Indicates the near-end crosstalk measurement value when the attenuator is 0dB, in dB; N 2 Indicates the near-end crosstalk measurement value after the attenuator reaches a certain attenuation value, in dB)

[0109] c) Use a network analyzer to calibrate the actual attenuation difference of the coaxial step attenuator before and after the above frequency point as the standard value N 0 ;

[0110] d) Select different line pair combinations and repeat step b), change the attenuation of the coaxial step attenuator, and record the corresponding data;

[0111] 5.2. The main unit of the network cable analyzer must work together with the remote end;

[0112] a) Press Figure 7 As shown, a network analyzer and a short-circuit of the impedance converter are connected through an impedance converter to perform a through calibration amplitude;

[0113] b) Press Figure 7 As shown, an impedance converter is used to connect the network analyzer and the 1-2 line pair and the 3-6 line pair at the same end of the auxiliary cable. The other end of the auxiliary cable is connected to the impedance converter. The unused ports of the two impedance converters are connected to 50Ω loads. The auxiliary cable is measured with a network analyzer to read the attenuation value N between the two groups of line pairs at the frequency point to be measured. 0 ;

[0114] c) Press Figure 4 Connect the network cable analyzer to the auxiliary cable in b);

[0115] d) The network cable analyzer uses the near-end crosstalk measurement function to read the near-end crosstalk value N between the above line pairs at the corresponding frequency point;

[0116] e) Use auxiliary cables with different NEXT values ​​and repeat the above measurements;

[0117] Operation Instructions – Step 6;

[0118] 6. Equivalent far-end crosstalk test:

[0119] a) Use a network analyzer to Figure 8 As shown, connect the ELFEXT simulator or auxiliary cable through an impedance converter (connect the unused port of the impedance converter to a 50Ω load) and read the insertion loss value A of the crosstalked 1-2 line pair at the frequency point to be measured. 0 ;

[0120] b) Use a network analyzer to Fig. 9 As shown, connect the ELFEXT simulator or auxiliary cable through an impedance converter (connect the unused port of the impedance converter to a 50Ω load) and read the far-end crosstalk value F between the 3-6 line pair and the 1-2 line pair at the frequency point to be measured. 0 ;

[0121] c) According to formula E 0 =F 0 -A 0 Calculate the equivalent far-end crosstalk value E between the 3-6 line pair and the 1-2 line pair at this frequency point 0 ; (Where: E 0 Indicates the equivalent far-end crosstalk value in dB; F 0 Indicates the far-end crosstalk measurement value in dB; A 0 It indicates the insertion loss value of the crosstalked line pair at the frequency point to be tested, in dB;)

[0122] d) Use a network cable analyzer such as Fig.10 As shown, measure the ELFEXT simulator or auxiliary cable and read the equivalent far-end crosstalk value E between the two groups of line pairs under test at the specified frequency point;

[0123] e) Repeat the above measurements using an ELFEXT simulator or auxiliary cables with different crosstalk values ​​and record the corresponding data;

[0124] Operation Instructions – Step 7;

[0125] 7. Length test:

[0126] a) Use a network cable analyzer such as Figure 4 Connect a stable cable with a calibrated length as shown, input the nominal propagation rate NVP value of the stable cable to be tested in the "Settings" of the network cable analyzer, use the length measurement function, and read its physical length value L;

[0127] b) Repeat the above measurements using stable cables of different lengths and record the corresponding data;

[0128] Operation Instructions – Step 8;

[0129] 7. Return loss;

[0130] 7.1. The main unit of the network cable analyzer can work independently;

[0131] a) If Fig.11 As shown, connect the impedance converter to one port of the network analyzer, and then use the calibration kit of the impedance converter to perform single-ended calibration;

[0132] b) If Fig.11 As shown in the figure, the network analyzer is used to calibrate the return loss value of the return loss auxiliary component at the frequency point to be measured, which is recorded as R L ;

[0133] c) If Fig.12 As shown in the figure, use the network cable analyzer to measure the return loss of the return loss auxiliary component and read the return loss value R at the frequency point to be measured. 0 ;

[0134] d) Replace the return loss auxiliary components with different values, repeat the above measurements, and record the corresponding data;

[0135] 8.2. The main unit of the network cable analyzer must work together with the remote end;

[0136] a) If Fig.11 As shown, connect the impedance converter to one port of the network analyzer, and then perform single-ended calibration using the calibration kit of the impedance converter;

[0137] b) If Fig.13 As shown in the figure, the network analyzer is used to calibrate the return loss value of the auxiliary cable at the frequency point to be measured, which is connected to the other end of the network cable analyzer. It is recorded as R L ;

[0138] c) If Fig.14 As shown, connect the network cable analyzer and the auxiliary cable; use the return loss measurement function of the network cable analyzer to read the value R of each line pair at the corresponding frequency point;

[0139] d) Use auxiliary cables with different return loss values ​​and repeat the above measurements.

[0140] Appendix 2: Standard instruments and their verification tests:

[0141] 2.1 Insertion loss standard;

[0142] 2.1.1 Composition of standard instruments;

[0143] The insertion loss standard consists of two coaxial step attenuators (hereinafter referred to as attenuators) and two sets of RJ45 to SMA fixtures (hereinafter referred to as fixtures). One end of each set of fixtures is an RJ45 interface, and one end of the eight leads is connected to the 8 copper pins of the RJ45 interface respectively. The other end of each lead is an SMA interface. Each attenuator is connected to the SMA interface of the same numbered leads of the two sets of fixtures.

[0144] 2.1.2 Calibration of standard instruments;

[0145] 1) Calibration of attenuator:

[0146] Each attenuator is connected in series with two ports of the network analyzer to measure the scattering parameter S 21，a，m (f), calculate the insertion loss IL of the attenuator by equation (2-1) Att，a，m (f), the subscripts a and m represent the setting value and serial number of the attenuator respectively;

[0147] 2) Calibration of fixture

[0148] The SMA interfaces of each lead of each set of fixtures are connected to port 1 of the network analyzer respectively, and the RJ45 interface of the fixture is in the empty state. The scattering parameter S is measured. 11，b，n (f), calculate the insertion loss IL of the fixture lead by formula (2-2) Fxt，b，n (f), the subscripts b and n represent the fixture lead number and group number, so S 11，b，n (f) The logarithm is taken as the return loss. The propagation distance of the insertion loss measurement signal is half of the return loss, so the insertion loss is obtained by dividing by 2. At the same time, since the outgoing wave and the incident wave with the same amplitude and opposite phase at a specific frequency cancel each other out when measuring the reflected signal, the fitting method is used to filter out the signal elimination at a specific frequency to obtain the estimated value of the fixture lead insertion loss. (Formula 2-3),

[0149] 3) Calibration of standard instruments

[0150] Taking 12 pairs as an example, when both attenuators are set to a 0 When dB, the insertion loss calibration value IL 0，k (f) is calculated by formula (2-4), where the k subscript represents the line pair. According to ANSI / TIA-568.2-D, the maximum insertion loss limit in the frequency range of 0 to 2000 MHz is about 26 dB, so attenuator a 0The setting value is 5dB, 10dB, 20dB, 30dB.

[0151] IL Att，a，m (f) = 201 g S 21，a，m (f)……………………(2-1)

[0152] IL Fxt，b，n (f) = 20lg (S 11，b，n (f)) / 2……………………(2-2)

[0153]

[0154]

[0155] In formulas 2-1 to 2-4, f is the frequency; in formula 2-3, is the sum of f and The coefficients of the equation obtained after doing linear regression;

[0156] 2.1.3、Verification test of standard instrument;

[0157] 2.1.3.1、Test methods;

[0158] Set both attenuators in the standard to a 0 dB, a 0 Take 5dB, 10dB, 20dB, 30dB, at different a 0 Under this condition, the insertion loss value of the standard 1-2 line pair is measured using a network cable tester, and the test environment conditions meet the relevant requirements of JJF1494-2014;

[0159] 2.1.3.2 Experimental data analysis;

[0160] Network analyzer and network cable tester insertion loss measurement data for the standard device can be found in Figure 2 In the figure, the blue, green, red and black curves are the measurement curves when the attenuator is set to 5dB, 10dB, 20dB and 30dB respectively. The solid line and dotted line are the calibration value curve of the network analyzer and the measurement value curve of the network cable tester respectively. Figure 2 It can be seen that for different attenuator setting values, within the frequency range of 0 to 2000MHz, the measurement curve change trends of the network analyzer and the network cable tester are basically the same. The measured value and the calibration value at the same frequency are basically consistent. As the frequency increases, the difference between the measured value and the calibration value increases slightly, but the maximum difference is basically within 2dB.

[0161] ANSI / TIA-568.2-D-2018 specifies the highest test frequencies for various types of network cables. Tables 1(a) to 1(d) show the insertion loss measurement data and differences of the network analyzer and network cable tester at the above frequency points when the standard attenuation value is set to 5dB, 10dB, 20dB, and 30dB. The maximum allowable insertion loss error (Worst case) for each specified frequency point specified in IEC 61935-1 is 2.9. The maximum difference between the network analyzer and the network cable tester at 1 to 2000MHz is 0.35. Based on the above analysis, at each specified frequency point and attenuation value setting point, the standard meets the test requirements.

[0162] 2.1.4 Advantages of Standard Instruments

[0163] JJF1494-20147.4 stipulates that a 100m stable cable should be used for insertion loss calibration. The standard described in this article uses an attenuator and a fixture combination to replace the cable, which improves the stability of the standard and the convenience of operation. At the same time, this method calibrates the insertion loss value of each lead of the fixture through a network analyzer and obtains the insertion loss value of the standard through calculation. Compared with the calibration method in JJF1494-20147.4.1, there is no need for impedance conversion. In addition, JJF1494-20147.4.1 stipulates that a short jumper should be used to perform a through calibration amplitude before calibrating the cable insertion loss. This operation ignores the attenuation introduced by the short jumper. The standard calibration method in this article includes the attenuation introduced by the attenuator and fixture pins into the insertion loss calibration value of the standard, eliminating the error introduced by ignoring the jumper.

[0164] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0165] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cable analyzer remote calibration system, comprising an on-site glasses terminal, a remote expert mobile terminal, a background management system and a server, characterized in that: The on-site glasses terminal includes an information collection module, an operation guidance module, a work order viewing module and a remote connection module, the remote expert mobile terminal includes an order dispatching module and a remote assistance module, and the backend management system includes an account management module, a work order management module and a call management module; The server is used to store information generated by the on-site glasses terminal, the remote expert mobile terminal and the backend management system, as well as step-by-step operation instructions; The information collection module is used to collect image information and language information generated by workers when they are working; The operation guidance module is used to view the step-by-step operation guidance instructions stored in the server; The work order viewing module is used to receive and view the task work orders sent by the remote expert mobile terminal; The remote link module is used for interaction between the on-site glasses terminal and the remote expert mobile terminal; The dispatching module is used to generate a task work order and dispatch the task work order to the on-site glasses end; The remote assistance module is used to remotely control the on-site glasses end; The account management module is used to manage accounts, including account creation, deletion, modification and search; The work order management module is used to record the information of the task work order and generate a PDF report; The call management module is used to record the interaction information between the eyeglass end and the remote expert mobile end, and generate a screen recording file; The server also includes an expansion module, and the expansion module is used to link the server with an external calibration device; The backend management system also includes a download module and an upload module; The download module is used to download the information stored in the server; The upload module is used to prepare the information downloaded in the download module into step-by-step operation instructions, and upload the step-by-step operation instructions to the server. The remote link module includes a call module, a conversation module, an assistance module and a screen recording module; The calling module is used to call an expert; The call module is used to make a video call with the expert; The assistance module is used to switch the guidance mode; The screen recording module is used to trigger the information collection module to collect image information and language information; The remote assistance module includes a confirmation module and an assistance module; When the confirmation module is triggered, the remote connection module and the remote assistance module begin to exchange information; The assistance module is used to judge the information collected by the information collection module and transmit a guidance message to the remote link module; When the problem cannot be solved through the video call, the online employee switches to the guidance mode through the assistance module, and shares his own operation process screen to the remote expert mobile terminal in real time. At the same time, the remote expert mobile terminal starts to remotely control the on-site glasses terminal.

2. A cable analyzer remote calibration system according to claim 1, characterized in that: The step-by-step operation instructions stored in the server include audio, video and AR 3D animation.

3. A cable analyzer remote calibration system according to claim 1, characterized in that: The remote link module also includes a contact selection module and an on-the-job marking module; The contact selection module is used to arrange the list of experts; The on-the-job marking module is used to mark whether the experts arranged in the contact selection module are online, and to prioritize the list of online experts.

4. A cable analyzer remote calibration system according to claim 1, characterized in that: The dispatch module also includes a contact screening module and a note module; The contact screening module is used to screen the online employee list and arrange the online employee list; The remarks module is used to mark the order acceptance status of the online employee list and the distance between the online employee and the calibration location.

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