Intelligent number circuit resistance tester

Abstract

The application provides a kind of intelligent digital loop resistance tester, including host computer and a pair of handheld devices, the handheld device and host computer are connected by cable to form closed loop, current contact pin is fixedly connected on the handheld device, and voltage contact pin is slidably connected, the cable is provided with current lead wire connected with current contact pin and voltage lead wire connected with voltage contact pin, the handheld device is built-in sub-control module and micro switch electrically connected with sub-control module, which are wirelessly communicated with host computer, and the micro switch is arranged at the end of the voltage contact pin;The application integrates wiring function into the device, cancels the traditional manual wiring step, and only one person is needed to complete all operations, which greatly reduces the demand for manpower.

Description

Technical Field

[0001] This invention relates to the field of loop resistance testing technology, and in particular to an intelligent digital loop resistance tester. Background Technology

[0002] Loop resistance testing is a crucial aspect of power equipment maintenance, its core function being to inspect the contact quality of high-voltage electrical connections. Abnormal resistance at the connections of various conductive components in an electrical system can lead to localized overheating or even equipment damage; therefore, high-precision measurement methods are necessary to ensure the safe operation of the power grid. Currently, the industry commonly employs DC-excitation-based measurement methods. This involves injecting a stable current into the circuit under test and simultaneously capturing the voltage signal, then calculating the resistance value using physical laws. These methods place high demands on the equipment's anti-interference capabilities and signal acquisition accuracy.

[0003] Existing technical solutions generally adopt a split-type structural design, consisting of a main unit and multiple sets of external test fixtures to form a complete measurement system. During operation, separate current excitation and voltage sampling circuits must be set up, and the processes of clamping, testing, data recording, and removal must be completed manually. Although some improved models have achieved increased portability by reducing the size of the main unit, they fundamentally do not change the strong reliance on manual operation in traditional testing methods. Measurement efficiency is limited by repetitive manual steps, especially in multi-point measurement scenarios, where the process is cumbersome and time-consuming.

[0004] The closest prior art to this invention is a handheld loop resistance tester. Referring to Chinese Patent Publication No. CN216013501U, a handheld loop resistance tester relates to the field of resistance tester technology. It includes a handheld loop resistance tester body, an anti-drop component, and a shock-absorbing protective component. The handheld loop resistance tester body has an elastic block on its front edge. The anti-drop component includes an assembly box, an anti-drop wristband, a guide rope, and a winding mechanism. The anti-drop wristband is located inside the assembly box, and one side of the wristband is connected to one end of the guide rope. A drive box is located on one side of the assembly box, and the winding mechanism is located inside the drive box. By setting up the anti-drop component consisting of the assembly box, anti-drop wristband, guide rope, and winding mechanism, the handheld loop resistance tester body can be connected to the user's wrist using the anti-drop wristband and guide rope, thus preventing the handheld loop resistance tester body from falling from the user's hand and causing collision damage during use. This technical approach, while maintaining the basic measurement principle, achieves the possibility of single-handed operation through a compact structural design. However, these products still have obvious limitations in engineering practice: although the physical form tends to be portable, in actual operation, all the steps of traditional four-wire wiring still need to be completed. They have neither broken through the inherent mode of multi-fixture collaborative work nor built an automated testing process. In essence, they have not solved the deep-seated problems such as the high proportion of wiring time and the insufficient level of intelligence in the testing process. Summary of the Invention

[0005] This invention solves the problems of high labor costs and low efficiency in traditional loop resistance testing. It proposes an intelligent digital loop resistance tester that integrates wiring functions into the device, eliminating the traditional manual wiring steps. Only one person is needed to complete all operations, greatly reducing the manpower requirement.

[0006] A further objective of this invention is to flexibly select the structure and function of a pair of handheld devices based on the structure of the load under test. Either a scheme in which the two handheld devices have identical structures can be selected, allowing for flexible interchangeability and adaptability to different usage spaces by utilizing their shape characteristics, thereby improving the versatility of the devices; or the main device and the auxiliary device can be distinguished, with connection and disconnection controlled only by the main device, making the operation more convenient and labor-saving for the operator and optimizing the user experience.

[0007] To achieve the above objectives, the following technical solution is proposed:

[0008] A smart digital circuit resistance tester includes a main unit and a pair of handheld devices. The handheld devices and the main unit are connected by a cable to form a closed circuit. A current pin is fixedly connected to the handheld device and a voltage pin is movably connected to it. The cable is provided with a current wire connected to the current pin and a voltage wire connected to the voltage pin. The handheld device has a built-in sub-control module that is wirelessly connected to the main unit and a micro switch that is electrically connected to the sub-control module. The micro switch is located at the end of the voltage pin.

[0009] Traditional methods require multiple steps, including manual wiring, equipment operation, and result verification, resulting in a time-consuming process and prolonged substation power outage testing time. This invention, through its probe design, eliminates the wiring step and automates measurement, enabling rapid testing, reducing power outage time, and minimizing impact on the power grid and economic losses. Traditional testing requires at least three people working together, leading to high labor costs and low efficiency. This invention integrates the wiring function into the equipment, eliminating the traditional manual wiring step; only one person is needed to complete the entire operation, significantly reducing manpower requirements. Traditional clamps are prone to getting stuck or failing to clamp properly on narrow, inclined, or complex contact surfaces, leading to measurement failures. This invention features a flexible and adjustable test probe that can adapt to contact surfaces of different angles and shapes, such as bent areas or hidden connectors, significantly improving the adaptability of testing scenarios.

[0010] Preferably, the handheld device is provided with a current connecting copper plate. One end of the current connecting copper plate is in close contact with the inner wall of the handheld device. The threaded end of the current pin passes through the handheld device and the current connecting copper plate in sequence and is threadedly connected to the current connecting nut. The other end of the current connecting copper plate is fitted and fixed to the current copper connector. The current copper connector is connected to one end of the current wire.

[0011] The handheld device of the present invention has a current-connecting copper sheet in its inner cavity. One end of the current-connecting copper sheet is bent and tightly attached to the inner wall of the handheld device. The bottom surface of the current-connecting copper sheet is attached and fixed to the lower inner wall of the handheld device. The other end of the current-connecting copper sheet is attached and fixed to a current copper connector. The current copper connector is connected to one end of a current wire. One end of the current pin extends out of the handheld device. The other end of the current pin is threaded. The other end of the current pin passes through the handheld device and the current-connecting copper sheet in sequence and is then threadedly connected to the current-connecting nut.

[0012] Preferably, the voltage ejector pin includes a voltage ejector post and a voltage sliding post. The voltage sliding post is integrally formed with the voltage ejector post and has a smaller diameter than the voltage ejector post. A trigger nut is threaded to the end of the voltage sliding post. The voltage sliding post is connected to a voltage wire. A return spring is sleeved on the voltage sliding post. The return spring is disposed between the voltage ejector post and the outer wall of the handheld device.

[0013] The voltage ejector pin of this invention includes an integrally formed voltage ejector post and a voltage sliding post, the diameter of which is smaller than that of the voltage ejector post. The end of the voltage sliding post is threaded, and a trigger nut is connected to it via the thread. The end of the trigger nut is rounded, and the trigger nut contacts or disconnects from a microswitch as the voltage ejector pin moves. The voltage sliding post is connected to the main unit via a voltage wire, and a return spring is fitted onto the voltage sliding post. The return spring is positioned between the stepped surface formed by the voltage ejector post and the voltage sliding post and the outer wall of the handheld device.

[0014] Preferably, a sleeve is fitted onto the voltage sliding post, the sleeve is slidably connected to the handheld device, and a limiting ring is provided on the end face of the sleeve. The outer diameter of the limiting ring is larger than the outer diameter of the sleeve and larger than or equal to the diameter of the voltage ejector post. The reset spring is disposed between the outer wall of the limiting ring and the stepped surface formed by the voltage ejector post and the voltage sliding post.

[0015] The present invention includes a sleeve for protecting the voltage ejector pin fitted onto the voltage sliding post. The outer wall of the sleeve is slidably connected to the handheld device. A limiting ring with an outer diameter larger than the outer diameter of the sleeve is provided on the end face of the sleeve. The outer diameter of the limiting ring is greater than or equal to the diameter of the voltage ejector pin. A return spring is disposed between the stepped surface formed by the voltage ejector pin and the voltage sliding post and the outer wall of the limiting ring. Since the voltage ejector pin needs to move frequently, the sleeve in this invention prevents frequent friction between the voltage ejector pin and the handheld device body, thus extending the service life of both the voltage ejector pin and the handheld device.

[0016] Preferably, a voltage connection copper plate is fixed between the sleeve and the trigger nut, and the voltage connection copper plate is connected to the voltage wire.

[0017] The voltage conductor of the present invention is connected to the voltage pin through a voltage connecting copper sheet, and the voltage connecting copper sheet is fixed between the sleeve and the trigger nut.

[0018] Preferably, the host is equipped with a power output module and a current and voltage acquisition module. The outer wall of the host is provided with a pair of current interfaces and a pair of voltage interfaces. The power output module outputs a constant current to the loop resistor through the current interface. The current and voltage acquisition module obtains the output current value through the current interface and obtains the voltage value generated by the loop resistor through the voltage interface.

[0019] The host of the present invention is provided with a power output module for outputting a constant current to the loop resistor and a current and voltage acquisition module for acquiring the output current value and the voltage value generated by the loop resistor. The outer wall of the host is provided with a pair of voltage interfaces and a pair of current interfaces. The current interfaces are connected to the output terminal of the power output module, and the current interface and voltage interface are connected to the input terminal of the current and voltage acquisition module.

[0020] Preferably, one end of the current conductor of the cable is connected to the current pin, and the other end of the current conductor of the cable is plugged into the current interface through a current plug. One end of the voltage conductor of the cable is connected to the voltage pin, and the other end of the voltage conductor of the cable is plugged into the voltage interface through a voltage plug.

[0021] In this invention, the current pin is connected to one end of the current conductor, and the other end of the current conductor is connected to a current plug that is inserted into a current interface. Similarly, the voltage pin is connected to one end of the voltage conductor, and the other end of the voltage conductor is connected to a voltage plug that is inserted into a voltage interface. Traditional equipment wiring connections are prone to loosening, and poor contact can lead to data fluctuations or even test interruptions. This invention employs a "one-click plug-in" interface design; the plug automatically locks in place after insertion, ensuring both quick connection and stable contact, thus preventing data errors.

[0022] Preferably, both the ejector end of the current ejector and the ejector end of the voltage ejector are truncated cones.

[0023] To improve the accuracy of the measurement points, this invention designs both the ejector ends of the current pin and the voltage pin to be truncated cones. In actual operation, the truncated cone ends of the pins can be used to tilt and insert them into the connection holes to first connect the power supply to the host through the current pin, and then insert the voltage pin to trigger the micro switch to start the test. The connection sequence is cleverly achieved through the simple feature of the truncated cone ends of the pins.

[0024] Preferably, the outer shell of the handheld device has an integrally formed handheld part and a top-mounted part, the handheld part and the top-mounted part are at a certain angle, the certain angle being between 145° and 170°.

[0025] The handheld device of the present invention has a housing with a handheld part and a top-mounted part, which are integrally formed and the included angle between the handheld part and the top-mounted part is between 145° and 170°. Current pins and voltage pins extend vertically from the end face of the top-mounted part. This arrangement is intended to prevent wrist twisting when the current pins and voltage pins contact the circuit resistor, reducing the burden on the user and making the handheld device more convenient to use.

[0026] Preferably, the sub-control module and the micro switch are disposed in the top part, and the handheld part is provided with a handheld device power supply for powering the sub-control module.

[0027] The micro switch and sub-control module of the present invention are disposed in the top part, the handheld part is provided with a handheld device power supply, the handheld device power supply supplies power to the sub-control module, and the outer shell of the handheld device is provided with a charging interface, the charging interface is used to charge the handheld device power supply.

[0028] The beneficial effects of this invention are as follows: Traditional methods require multiple steps such as manual wiring, equipment operation, and result verification, which are time-consuming and force substation power outage testing to be prolonged. This invention, through its probe design, eliminates the wiring step and automates measurement, enabling rapid testing, reducing power outage time, and minimizing the impact on the power grid and economic losses. Traditional testing requires at least three people working together, resulting in high labor costs and low efficiency. This invention integrates the wiring function into the equipment, eliminating the traditional manual wiring step; only one person needs to complete the entire operation with both hands, significantly reducing manpower requirements. Traditional clamps are prone to getting stuck or failing to clamp properly on narrow, inclined, or complex contact surfaces, leading to measurement failures. This invention features a flexible and adjustable test probe that can adapt to contact surfaces of different angles and shapes, such as bent areas or hidden connectors, significantly improving the adaptability of testing scenarios. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0030] Figure 2 This is a schematic diagram of the current-driven pin structure connection of the present invention.

[0031] Figure 3 This is a cross-sectional view of the handheld device of the present invention.

[0032] Figure 4 This is a partially enlarged schematic diagram of the voltage pin structure of the present invention.

[0033] The components are as follows: 1. Main unit; 2. Handheld device; 3. Connecting cable; 11. Current interface; 12. Voltage interface; 21. Current pin; 22. Voltage pin; 23. Current connecting copper plate; 24. Current connecting nut; 25. Housing; 26. Handheld device power supply; 27. Sub-control module; 28. Micro switch; 29. ​​Sleeve; 31. Current plug; 32. Voltage plug; 33. Current copper connector; 210. Trigger nut; 211. Voltage connecting copper plate; 212. Return spring; 221. Voltage ejector post; 222. Voltage sliding post; 251. Handheld part; 252. Ejector part; 291. Limit ring. Detailed Implementation

[0034] Example 1:

[0035] This embodiment proposes a digitalized circuit resistance tester, referencing... Figure 1The device includes a main unit 1, a pair of handheld devices 2, and a cable 3. The main unit 1 and the handheld devices 2 are connected together by the cable 3. The handheld devices 2 are equipped with copper current pins 21 and voltage pins 22. The current pins 21 are fixedly connected to the handheld devices 2, and the voltage pins 22 are slidably connected to the handheld devices 2. The cable 3 is equipped with current wires and voltage wires. The main unit 1 is connected to the current pins 21 by the current wires, and the main unit 1 is connected to the voltage pins 22 by the voltage wires. The handheld devices 2 have a built-in sub-control module 27 and a micro switch 28. The sub-control module 27 is wirelessly connected to the main unit 1, and the micro switch 28 is electrically connected to the sub-control module 27. The micro switch 28 is located at the end of the voltage pins 22.

[0036] The handheld device replaces traditional test fixtures. Current and voltage leads are internally routed to two external pins. The current pin is fixed, while the voltage pin is retractable. These two pins connect to the load under test. The cable connecting to the main unit uses quick-connect terminals. During measurement, the current pin first contacts the load, then the voltage pin is compressed. The displacement of the voltage pin triggers a microswitch. The sub-control module detects this measurement status and sends the test request to the main unit via wireless communication. The main unit outputs a constant current source to the load under test, acquires the voltage across the load, calculates the resistance, and sends the test data to the handheld device and mobile app via Bluetooth. Its compact design allows it to be easily carried, clipped to a belt. The sub-control module can be a microcontroller, and the wireless communication technology uses either Bluetooth or 4G. Furthermore, the sub-control module can be electrically connected to a display to show the measured resistance and to indicator lights to show if the microswitch has been triggered. Both the display and indicator lights can be integrated into the handheld device.

[0037] The host program timing is as follows:

[0038] S1, host starts up and power on, peripherals and parameters are initialized;

[0039] S2, waiting for testing, the test will begin on the mobile phone and handheld device or the buttons on the host;

[0040] S3, Start Test, the power supply starts to output the set current value, and samples the output current value and the voltage drop generated by the loop resistance;

[0041] S4, calculate the data and determine whether the data is within the instrument's rated range. If it exceeds the range, stop the test immediately.

[0042] S5, test complete, display and upload test data, waiting for the next round of test data.

[0043] Traditional methods require multiple steps, including manual wiring, equipment operation, and result verification, resulting in a time-consuming process and prolonged substation power outage testing time. This invention, through its probe design, eliminates the wiring step and automates measurement, enabling rapid testing, reducing power outage time, and minimizing impact on the power grid and economic losses. Traditional testing requires at least three people working together, leading to high labor costs and low efficiency. This invention integrates the wiring function into the equipment, eliminating the traditional manual wiring step; only one person is needed to complete the entire operation, significantly reducing manpower requirements. Traditional clamps are prone to getting stuck or failing to clamp properly on narrow, inclined, or complex contact surfaces, leading to measurement failures. This invention features a flexible and adjustable test probe that can adapt to contact surfaces of different angles and shapes, such as bent areas or hidden connectors, significantly improving the adaptability of testing scenarios.

[0044] refer to Figure 2 The handheld device 2 of the present invention has a current connecting copper sheet 23 in its inner cavity. One end of the current connecting copper sheet 23 is bent and tightly attached to the inner wall of the handheld device 2. The bottom surface of the current connecting copper sheet 23 is attached and fixed to the lower inner wall of the handheld device 2. The other end of the current connecting copper sheet 23 is attached and fixed to a current copper connector 33. The current copper connector 33 is connected to one end of the current wire. One end of the current pin 21 extends out of the handheld device 2. The other end of the current pin 21 is threaded. The other end of the current pin 21 passes through the handheld device 2 and the current connecting copper sheet 23 in sequence and is then threadedly connected to the current connecting nut 24.

[0045] The host of the present invention is provided with a power output module for outputting a constant current to the loop resistor and a current and voltage acquisition module for acquiring the output current value and the voltage value generated by the loop resistor. The outer wall of the host is provided with a pair of voltage interfaces 12 and a pair of current interfaces 11. The current interface 11 is connected to the output terminal of the power output module, and the current interface 11 and the voltage interface 12 are connected to the input terminal of the current and voltage acquisition module.

[0046] The current pin 21 of this invention is connected to one end of a current conductor, and the other end of the current conductor is connected to a current plug 31 that plugs into the current interface 11. Similarly, the voltage pin 22 of this invention is connected to one end of a voltage conductor, and the other end of the voltage conductor is connected to a voltage plug 32 that plugs into the voltage interface 12. Traditional equipment connectors are prone to loosening, and poor contact can lead to data fluctuations or even test interruptions. This invention adopts a "one-click plug-in" interface design, where the plug automatically locks in place after insertion, enabling quick connection while ensuring stable contact and avoiding data errors.

[0047] To improve the accuracy of the measurement points, the present invention designs the ejector ends of the current pin 21 and the voltage pin 22 as truncated cones.

[0048] In this embodiment, the internal structures of the left and right handheld devices of a pair are mirror images of each other, each including a current pin 21 and a voltage pin 22. The current pin 21 is fixedly connected to the handheld device 2, and the voltage pin 22 is slidably connected to the handheld device 2. The host computer supplies power to the sub-control modules of the two handheld devices through cables.

[0049] Example 2:

[0050] This embodiment optimizes the structure of the voltage pin 22 based on Embodiment 1, and proposes a smart digital loop resistance tester, referencing... Figure 1 The device includes a main unit 1, a pair of handheld devices 2, and a cable 3. The main unit 1 and the handheld devices 2 are connected together by the cable 3. The handheld devices 2 are equipped with copper current pins 21 and voltage pins 22. The current pins 21 are fixedly connected to the handheld devices 2, and the voltage pins 22 are plugged into the handheld devices 2. The cable 3 is equipped with current wires and voltage wires. The main unit 1 is connected to the current pins 21 by the current wires, and the main unit 1 is connected to the voltage pins 22 by the voltage wires. The handheld devices 2 have a built-in sub-control module 27 and a micro switch 28. The sub-control module 27 is wirelessly connected to the main unit 1, and the micro switch 28 is electrically connected to the sub-control module 27. The micro switch 28 is located at the end of the voltage pins 22.

[0051] The handheld device replaces traditional test fixtures. Current and voltage leads are internally routed to two external pins. The current pin is fixed, while the voltage pin is retractable. These two pins connect to the load under test. The cable connecting to the main unit uses quick-connect terminals. During measurement, the current pin first contacts the load, then the voltage pin is compressed. The displacement of the voltage pin triggers a microswitch. The sub-control module detects this measurement status and sends the test request to the main unit via wireless communication. The main unit outputs a constant current source to the load under test, acquires the voltage across the load, calculates the resistance, and sends the test data to the handheld device and mobile app via Bluetooth. Its compact design allows it to be easily carried, clipped to a belt. The sub-control module can be a microcontroller, and the wireless communication technology uses either Bluetooth or 4G. Furthermore, the sub-control module can be electrically connected to a display to show the measured resistance and to indicator lights to show if the microswitch has been triggered. Both the display and indicator lights can be integrated into the handheld device.

[0052] The host program timing is as follows:

[0053] S1, host starts up and power on, peripherals and parameters are initialized;

[0054] S2, waiting for testing, the test will begin on the mobile phone and handheld device or the buttons on the host;

[0055] S3, Start Test, the power supply starts to output the set current value, and samples the output current value and the voltage drop generated by the loop resistance;

[0056] S4, calculate the data and determine whether the data is within the instrument's rated range. If it exceeds the range, stop the test immediately.

[0057] S5, test complete, display and upload test data, waiting for the next round of test data.

[0058] Traditional methods require multiple steps, including manual wiring, equipment operation, and result verification, resulting in a time-consuming process and prolonged substation power outage testing time. This invention, through its probe design, eliminates the wiring step and automates measurement, enabling rapid testing, reducing power outage time, and minimizing impact on the power grid and economic losses. Traditional testing requires at least three people working together, leading to high labor costs and low efficiency. This invention integrates the wiring function into the equipment, eliminating the traditional manual wiring step; only one person is needed to complete the entire operation, significantly reducing manpower requirements. Traditional clamps are prone to getting stuck or failing to clamp properly on narrow, inclined, or complex contact surfaces, leading to measurement failures. This invention features a flexible and adjustable test probe that can adapt to contact surfaces of different angles and shapes, such as bent areas or hidden connectors, significantly improving the adaptability of testing scenarios.

[0059] refer to Figure 2 The handheld device 2 of the present invention has a current connecting copper sheet 23 in its inner cavity. One end of the current connecting copper sheet 23 is bent and tightly attached to the inner wall of the handheld device 2. The bottom surface of the current connecting copper sheet 23 is attached and fixed to the lower inner wall of the handheld device 2. The other end of the current connecting copper sheet 23 is attached and fixed to a current copper connector 33. The current copper connector 33 is connected to one end of the current wire. One end of the current pin 21 extends out of the handheld device 2. The other end of the current pin 21 is threaded. The other end of the current pin 21 passes through the handheld device 2 and the current connecting copper sheet 23 in sequence and is then threadedly connected to the current connecting nut 24.

[0060] refer to Figure 4 The voltage ejector pin 22 of the present invention includes an integrally formed voltage ejector pin 221 and a voltage sliding pin 222, the diameter of which is smaller than that of the voltage ejector pin 221. The end of the voltage sliding pin 222 is threaded, and a trigger nut 210 is connected to it via the thread. The end of the trigger nut 210 is rounded, and the trigger nut 210 contacts or disconnects from the microswitch as the voltage ejector pin 22 moves. The voltage sliding pin 222 is connected to the main unit 1 via a voltage wire. A return spring 212 is sleeved on the voltage sliding pin 222, and the return spring 212 is disposed between the stepped surface formed by the voltage ejector pin 221 and the voltage sliding pin 222 and the outer wall of the handheld device 2.

[0061] The present invention includes a sleeve 29 for protecting the voltage ejector pin 22, fitted onto the voltage sliding post 222. The outer wall of the sleeve 29 is slidably connected to the handheld device 2. A limiting ring 291 with an outer diameter larger than the outer diameter of the sleeve 29 is provided on the end face of the sleeve 29. The outer diameter of the limiting ring 291 is greater than or equal to the diameter of the voltage ejector post 221. A return spring 212 is disposed between the stepped surface formed by the voltage ejector post 221 and the voltage sliding post 222 and the outer wall of the limiting ring 291. Since the voltage ejector pin 22 needs to move frequently, the sleeve 29 is provided to prevent frequent friction between the voltage ejector pin 22 and the handheld device 2 body, thus extending the service life of both the voltage ejector pin 22 and the handheld device 2.

[0062] The voltage conductor of the present invention is connected to the voltage pin 22 through a voltage connecting copper piece 211, and the voltage connecting copper piece 211 is fixed between the sleeve 29 and the trigger nut 210.

[0063] The host of the present invention is provided with a power output module for outputting a constant current to the loop resistor and a current and voltage acquisition module for acquiring the output current value and the voltage value generated by the loop resistor. The outer wall of the host is provided with a pair of voltage interfaces 12 and a pair of current interfaces 11. The current interface 11 is connected to the output terminal of the power output module, and the current interface 11 and the voltage interface 12 are connected to the input terminal of the current and voltage acquisition module.

[0064] The current pin 21 of this invention is connected to one end of a current conductor, and the other end of the current conductor is connected to a current plug 31 that plugs into the current interface 11. Similarly, the voltage pin 22 of this invention is connected to one end of a voltage conductor, and the other end of the voltage conductor is connected to a voltage plug 32 that plugs into the voltage interface 12. Traditional equipment connectors are prone to loosening, and poor contact can lead to data fluctuations or even test interruptions. This invention adopts a "one-click plug-in" interface design, where the plug automatically locks in place after insertion, enabling quick connection while ensuring stable contact and avoiding data errors.

[0065] To improve the accuracy of the measurement points, the present invention designs the ejector ends of the current pin 21 and the voltage pin 22 as truncated cones.

[0066] In this embodiment, the internal structures of the left and right handheld devices of a pair of handheld devices are different, but both include a current pin 21 and a voltage pin 22; either handheld device serves as the main device, with its current pin 21 fixedly connected to the handheld device 2 and its voltage pin 22 slidably connected to the handheld device 2, the structure being the same as described above. Figure 4The publicly disclosed handheld devices have the same structure. Another handheld device serves as a secondary device. Although it includes a current pin 21 and a voltage pin 22, its voltage pin is fixedly connected to the secondary device, just like the current pin, rather than being movably connected. It also does not have microswitches or sub-control modules inside. Instead, the voltage pin is connected to the main unit via a voltage wire using a cable. In this way, when the secondary device is working, it can be directly inserted into the load being measured as the negative terminal to engage. Then, the closed circuit can be controlled by the main device, which can achieve single-handed control without having to keep the voltage pins of both devices in a closed state at the same time, making it easier and less strenuous.

[0067] Example 3:

[0068] This embodiment optimizes the casing of the handheld device based on Embodiment 2, and proposes a smart digital loop resistance tester, referencing... Figure 1 The device includes a main unit 1, a pair of handheld devices 2, and a cable 3. The main unit 1 and the handheld devices 2 are connected together by the cable 3. The handheld devices 2 are equipped with copper current pins 21 and voltage pins 22. The current pins 21 are fixedly connected to the handheld devices 2, and the voltage pins 22 are slidably connected to the handheld devices 2. The cable 3 is equipped with current wires and voltage wires. The main unit 1 is connected to the current pins 21 by the current wires, and the main unit 1 is connected to the voltage pins 22 by the voltage wires. The handheld devices 2 have a built-in sub-control module 27 and a micro switch 28. The sub-control module 27 is wirelessly connected to the main unit 1, and the micro switch 28 is electrically connected to the sub-control module 27. The micro switch 28 is located at the end of the voltage pins 22.

[0069] The handheld device replaces traditional test fixtures. Current and voltage leads are internally routed to two external pins. The current pin is fixed, while the voltage pin is retractable. These two pins connect to the load under test. The cable connecting to the main unit uses quick-connect terminals. During measurement, the current pin first contacts the load, then the voltage pin is compressed. The displacement of the voltage pin triggers a microswitch. The sub-control module detects this measurement status and sends the test request to the main unit via wireless communication. The main unit outputs a constant current source to the load under test, acquires the voltage across the load, calculates the resistance, and sends the test data to the handheld device and mobile app via Bluetooth. Its compact design allows it to be easily carried, clipped to a belt. The sub-control module can be a microcontroller, and the wireless communication technology uses either Bluetooth or 4G. Furthermore, the sub-control module can be electrically connected to a display to show the measured resistance and to indicator lights to show if the microswitch has been triggered. Both the display and indicator lights can be integrated into the handheld device.

[0070] The host program timing is as follows:

[0071] S1, host starts up and power on, peripherals and parameters are initialized;

[0072] S2, waiting for testing, the test will begin on the mobile phone and handheld device or the buttons on the host;

[0073] S3, Start Test, the power supply starts to output the set current value, and samples the output current value and the voltage drop generated by the loop resistance;

[0074] S4, calculate the data and determine whether the data is within the instrument's rated range. If it exceeds the range, stop the test immediately.

[0075] S5, test complete, display and upload test data, waiting for the next round of test data.

[0076] Traditional methods require multiple steps, including manual wiring, equipment operation, and result verification, resulting in a time-consuming process and prolonged substation power outage testing time. This invention, through its probe design, eliminates the wiring step and automates measurement, enabling rapid testing, reducing power outage time, and minimizing impact on the power grid and economic losses. Traditional testing requires at least three people working together, leading to high labor costs and low efficiency. This invention integrates the wiring function into the equipment, eliminating the traditional manual wiring step; only one person is needed to complete the entire operation, significantly reducing manpower requirements. Traditional clamps are prone to getting stuck or failing to clamp properly on narrow, inclined, or complex contact surfaces, leading to measurement failures. This invention features a flexible and adjustable test probe that can adapt to contact surfaces of different angles and shapes, such as bent areas or hidden connectors, significantly improving the adaptability of testing scenarios.

[0077] refer to Figure 2 The handheld device 2 of the present invention has a current connecting copper sheet 23 in its inner cavity. One end of the current connecting copper sheet 23 is bent and tightly attached to the inner wall of the handheld device 2. The bottom surface of the current connecting copper sheet 23 is attached and fixed to the lower inner wall of the handheld device 2. The other end of the current connecting copper sheet 23 is attached and fixed to a current copper connector 33. The current copper connector 33 is connected to one end of the current wire. One end of the current pin 21 extends out of the handheld device 2. The other end of the current pin 21 is threaded. The other end of the current pin 21 passes through the handheld device 2 and the current connecting copper sheet 23 in sequence and is then threadedly connected to the current connecting nut 24.

[0078] refer to Figure 4The voltage ejector pin 22 of the present invention includes an integrally formed voltage ejector pin 221 and a voltage sliding pin 222, the diameter of which is smaller than that of the voltage ejector pin 221. The end of the voltage sliding pin 222 is threaded, and a trigger nut 210 is connected to it via the thread. The end of the trigger nut 210 is rounded, and the trigger nut 210 contacts or disconnects from the microswitch as the voltage ejector pin 22 moves. The voltage sliding pin 222 is connected to the main unit 1 via a voltage wire. A return spring 212 is sleeved on the voltage sliding pin 222, and the return spring 212 is disposed between the stepped surface formed by the voltage ejector pin 221 and the voltage sliding pin 222 and the outer wall of the handheld device 2.

[0079] The present invention includes a sleeve 29 for protecting the voltage ejector pin 22, fitted onto the voltage sliding post 222. The outer wall of the sleeve 29 is slidably connected to the handheld device 2. A limiting ring 291 with an outer diameter larger than the outer diameter of the sleeve 29 is provided on the end face of the sleeve 29. The outer diameter of the limiting ring 291 is greater than or equal to the diameter of the voltage ejector post 221. A return spring 212 is disposed between the stepped surface formed by the voltage ejector post 221 and the voltage sliding post 222 and the outer wall of the limiting ring 291. Since the voltage ejector pin 22 needs to move frequently, the sleeve 29 is provided to prevent frequent friction between the voltage ejector pin 22 and the handheld device 2 body, thus extending the service life of both the voltage ejector pin 22 and the handheld device 2.

[0080] The voltage conductor of the present invention is connected to the voltage pin 22 through a voltage connecting copper piece 211, and the voltage connecting copper piece 211 is fixed between the sleeve 29 and the trigger nut 210.

[0081] The host of the present invention is provided with a power output module for outputting a constant current to the loop resistor and a current and voltage acquisition module for acquiring the output current value and the voltage value generated by the loop resistor. The outer wall of the host is provided with a pair of voltage interfaces 12 and a pair of current interfaces 11. The current interface 11 is connected to the output terminal of the power output module, and the current interface 11 and the voltage interface 12 are connected to the input terminal of the current and voltage acquisition module.

[0082] The current pin 21 of this invention is connected to one end of a current conductor, and the other end of the current conductor is connected to a current plug 31 that plugs into the current interface 11. Similarly, the voltage pin 22 of this invention is connected to one end of a voltage conductor, and the other end of the voltage conductor is connected to a voltage plug 32 that plugs into the voltage interface 12. Traditional equipment connectors are prone to loosening, and poor contact can lead to data fluctuations or even test interruptions. This invention adopts a "one-click plug-in" interface design, where the plug automatically locks in place after insertion, enabling quick connection while ensuring stable contact and avoiding data errors.

[0083] To improve the accuracy of the measurement points, the present invention designs the ejector ends of the current pin 21 and the voltage pin 22 as truncated cones.

[0084] refer to Figure 3 The handheld device 2 of the present invention has a housing 25 with a handheld portion 251 and a ejector portion 252, which are integrally formed and the included angle between the handheld portion 251 and the ejector portion 252 is between 145° and 170°. Current pins 21 and voltage pins 22 extend vertically from the end face of the ejector portion 252. This arrangement aims to prevent wrist twisting when the current pins 21 and voltage pins 22 contact the circuit resistor, reducing the burden on the user and making the handheld device more convenient to use.

[0085] The micro switch 28 and the sub-control module 27 of the present invention are disposed in the top part 252, and the handheld part 251 is provided with a handheld device power supply 26, which supplies power to the sub-control module 27. The outer shell 25 of the handheld device 2 is provided with a charging interface, which charges the handheld device power supply 26.

Claims

1. A smart digital circuit resistance tester, characterized in that, The device includes a main unit (1) and a pair of handheld devices (2). The main unit (1) and the pair of handheld devices (2) are connected by a cable (3) to form a closed loop. A current pin (21) is fixedly connected to the handheld device (2) and a voltage pin (22) is movably connected to it. The cable (3) is provided with a current wire connected to the current pin (21) and a voltage wire connected to the voltage pin (22). The handheld device (2) has a built-in sub-control module (27) that is wirelessly connected to the main unit (1) and a micro switch (28) that is electrically connected to the sub-control module (27). The micro switch (28) is located at the end of the voltage pin (22). The displacement of the voltage pin (22) triggers the micro switch (28). The sub-control module (27) detects the triggering state of the micro switch (28) and sends a test request to the host (1) via wireless communication. The ejector ends of the current pin (21) and the voltage pin (22) are both truncated cones. By tilting the insertion into the connection hole, the current pin (21) first contacts the load under test to supply power to the host (1). During measurement, the current pin (21) first contacts the load under test, and then the voltage pin (22) is compressed to trigger the micro switch (28).

2. The intelligent circuit resistance tester according to claim 1, characterized in that, The handheld device (2) is provided with a current connecting copper plate (23). One end of the current connecting copper plate (23) is tightly attached to the inner wall of the handheld device (2). The threaded end of the current pin (21) passes through the handheld device (2) and the current connecting copper plate (23) in sequence and is threadedly connected to the current connecting nut (24). The other end of the current connecting copper plate (23) is attached and fixed to the current copper connector (33). The current copper connector (33) is connected to one end of the current wire.

3. The intelligent digital circuit resistance tester according to claim 1, characterized in that, The voltage ejector pin (22) includes a voltage ejector pin (221) and a voltage sliding pin (222). The voltage sliding pin (222) is integrally formed with the voltage ejector pin (221) and its diameter is smaller than that of the voltage ejector pin (221). The end of the voltage sliding pin (222) is threaded with a trigger nut (210). The voltage sliding pin (222) is connected to a voltage wire. The voltage sliding pin (222) is fitted with a reset spring (212). The reset spring (212) is located between the voltage ejector pin (221) and the outer wall of the handheld device (2).

4. The intelligent circuit resistance tester according to claim 3, characterized in that, A sleeve (29) is fitted on the voltage sliding post (222). The sleeve (29) is slidably connected to the handheld device (2). A limiting ring (291) is provided on the end face of the sleeve (29). The outer diameter of the limiting ring (291) is greater than the outer diameter of the sleeve (29) and greater than or equal to the diameter of the voltage ejector post (221). The reset spring (212) is disposed between the outer wall of the limiting ring (291) and the stepped surface formed by the voltage ejector post (221) and the voltage sliding post (222).

5. The intelligent circuit resistance tester according to claim 4, characterized in that, A voltage connection copper piece (211) is fixed between the sleeve (29) and the trigger nut (210), and the voltage connection copper piece (211) is connected to the voltage wire.

6. The intelligent circuit resistance tester according to claim 1, characterized in that, The host is provided with a power output module and a current and voltage acquisition module. The outer wall of the host is provided with a pair of current interfaces (11) and a pair of voltage interfaces (12). The power output module outputs a constant current to the loop resistor through the current interface (11). The current and voltage acquisition module obtains the output current value through the current interface (11) and obtains the voltage value generated by the loop resistor through the voltage interface (12).

7. The intelligent digital circuit resistance tester according to claim 6, characterized in that, One end of the current conductor of the cable (3) is connected to the current pin (21), and the other end of the current conductor of the cable (3) is plugged into the current interface (11) through the current plug (31). One end of the voltage conductor of the cable (3) is connected to the voltage pin (22), and the other end of the voltage conductor of the cable (3) is plugged into the voltage interface (12) through the voltage plug (32).

8. A smart circuit resistance tester according to any one of claims 1-7, characterized in that, The ejector ends of the current ejector (21) and the voltage ejector (22) are both truncated cones.

9. A smart circuit resistance tester according to any one of claims 1-7, characterized in that, The outer shell (25) of the handheld device (2) is provided with an integrally formed handheld part (251) and a top part (252), the handheld part (251) and the top part (252) are at a certain angle, the certain angle range is between 145° and 170°.

10. A smart circuit resistance tester according to claim 9, characterized in that, The sub-control module (27) and micro switch (28) are located in the top part (252), and the handheld part (251) is provided with a handheld device power supply (26) for powering the sub-control module (27).

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