Magnetic attraction electricity measuring device and electricity measuring method

Abstract

The application relates to a magnetic adsorption electric measuring device and a method, which comprises a detection circuit and a conductive magnet; the conductive magnet is used as a detection probe of the magnetic adsorption electric measuring device and a mounting adsorption component; and the conductive magnet is connected in series into a detection loop of the detection circuit. In the application, the conductive magnet is changed from a traditional mechanical accessory irrelevant to the circuit into a necessary electrical functional component. The conductive magnet is no longer an additional product but an indispensable part in the current detection path, and realizes the qualitative change from 'physical adsorption' to 'electrical access'. Moreover, since the conductive magnet directly serves as an electrical probe, the metal pen point or probe which must exist independently and is used for electrical contact in the traditional design can be omitted or integrated with the magnet. This reduces the number of parts and simplifies the physical structure of the front end of the device.

Description

Technical Field

[0001] This invention relates to the field of electrical safety testing tools, specifically to a magnetic adsorption electrical measuring device and a measuring method. Background Technology

[0002] In the field of electrical testing, traditional test pens and their improved designs typically follow a clear principle of functional separation. Specifically, their testing circuit consists of a series of independent dedicated components: a metal probe for electrical contact, a functional module for current limiting or indication, and a grounding component (such as a metal cap at the tail) for forming the circuit.

[0003] To improve ease of use, existing technologies include designs that attach magnets to the casing of test pens. However, in these designs, the magnet is only given a single auxiliary mechanical function—for example, temporarily attaching the pen body to a metal surface for storage or retrieval. This magnet is electrically isolated from the core detection circuit of the test pen. The detection function still relies on a separate, dedicated metal probe, structurally and electrically separate from the magnet, to achieve electrical contact. The magnet and the probe, which performs the electrical function, are two independent components whose functions do not interfere with each other.

[0004] This design results in a complex product structure and fails to fully utilize the potential value of the magnet component. The magnet is merely an "attached" accessory, having no connection to the core electrical performance of the measurement, and its function is disconnected from the detection circuit itself. Summary of the Invention

[0005] Based on the above background, this invention provides a magnetic adsorption electrical measurement device and method, solving the technical problem that: in existing electrical measurement devices, the magnet is only a non-functional mechanical adsorption component, electrically insulated from the detection circuit, requiring an additional dedicated electrical probe to complete the electrical signal acquisition. This results in component redundancy, structural complexity, and the undeveloped and unutilized function of the magnet as a potential conductor, limiting the possibilities for structural integration and functional innovation in the electrical measurement device.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This invention provides a magnetic adsorption electrical measuring device, comprising: Detection circuit; A conductive magnet serves as the detection probe and mounting adsorption component of the magnetic adsorption electrometry device. The electromagnet is connected in series in the detection circuit of the detection circuit.

[0007] In one embodiment, the detection circuit includes a signal processing unit having a high-impedance input and a feedback path; The conductive magnet is electrically connected to the high-impedance input terminal and forms a closed loop with the output terminal of the signal processing unit or the reference ground through the feedback path.

[0008] In one embodiment, the magnetic adsorption measuring device has an exposed, touchable grounding electrode that is electrically connected to the grounding loop node of the detection circuit.

[0009] In one embodiment, the magnetic adsorption measuring device includes a housing, a battery, and a main control board. The battery and the detection circuit are disposed on the main control board and housed within the housing. The conductive detection surface of the magnetic conductor extends out of the housing. The magnetic conductor is a permanent magnet with a conductive coating on its surface; or, the magnetic conductor is a magnetic material component that is conductive in its body.

[0010] In one embodiment, the magnetic adsorption measuring device further includes a button disposed on the housing and a light connected to the main control board. The button corresponds to a switch on the main control board and is operated to control the on / off state of the light.

[0011] In one embodiment, the magnetic adsorption measuring device further includes a charging interface, which is electrically connected to the main control board and exposed on the housing, for connecting to an external power source to charge the battery; the metal housing of the charging interface is electrically connected to the grounding loop node of the detection circuit, and the grounding pin of the charging interface is electrically connected to the charging management circuit of the magnetic adsorption measuring device.

[0012] In one embodiment, the electromagnet is electrically connected to the detection circuit via an elastic conductive element; the elastic conductive element is a spring, conductive rubber, or metal sheet.

[0013] In a second aspect, the present invention provides a magnetic adsorption electrical measuring device, comprising: shell; The detection circuit is disposed within the housing; and A conductive magnet is fixed to the housing and connected in series in the detection circuit of the detection circuit; wherein the structure of the housing and the placement position of the conductive magnet are configured to allow the magnetic adsorption electrometry device to stably contact and electrically connect to the shaft of an independent conductive extension tool through the conductive magnet.

[0014] Thirdly, the present invention provides an electrical measurement method, comprising the following steps: Provide a magnetic adsorption electrical measuring device as described above; The conductive magnet of the magnetic adsorption measuring device is adsorbed onto a conductive surface. The conductive magnet collects electrical signals, which are then used by the detection circuit for detection.

[0015] Fourthly, the present invention provides an electrical measurement method, comprising the following steps: Provide a magnetic adsorption electrical measuring device as described above; The magnetic magnet of the magnetic adsorption measuring device is adsorbed onto the shaft of a conductive extension tool. Hold the insulating handle of the conductive extension tool and bring the metal working end of the conductive extension tool into contact with a part to be tested; Electrical detection is performed through the conductive path formed between the electromagnet, the conductive extension tool, and the part to be tested.

[0016] As can be seen from the above technical solutions, the embodiments of the present invention have at least the following advantages and positive effects: First, this invention achieves a functional leap for magnets: the magnet (conductive magnet) in this invention transforms from a traditional, circuit-independent mechanical accessory into an essential electrical functional component. It is no longer an add-on but an indispensable link in the current detection path, realizing a qualitative change from "physical adsorption" to "electrical connection." Second, this invention significantly simplifies the front-end structure: since the conductive magnet itself directly acts as an electrical probe, the metal pen tip or probe, which must exist independently in traditional designs specifically for electrical contact, can be eliminated or integrated with the magnet. This reduces the number of parts and simplifies the physical structure of the device's front end. Third, it provides flexible operational extensions and safe detection methods: because the conductive magnet has both adsorption and conductivity functions, the user can attach the entire device to a suitable position on a long-handled conductive tool (such as a metal wrench or screwdriver handle). At this time, the operator holds the insulated handle of the tool and touches the metal tip of the tool to the point to be tested in a distant or confined space; the current then sequentially passes through the tool tip, the tool body, and the conductive magnet into the detection path. This method effectively extends the detection distance, solving the problem of inconvenience in directly operating the measuring device in confined spaces such as deep within the distribution cabinet or behind equipment. Simultaneously, the use of long-handled tools ensures a safe distance between the operator and live parts, improving the safety and convenience of the detection process. Fourth, this invention creates a completely new functional integration platform for measuring devices: connecting the magnet to the circuit opens up entirely new design ideas for measuring technology. This basic architecture makes it possible to subsequently expand advanced functions such as grounding through the magnet itself and constructing new detection circuits, laying the foundation for improving detection convenience and reliability and developing new application models (such as fixed monitoring). Its fundamental innovation lies in breaking the traditional mindset of isolating the magnet from the detection circuit. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an electrical measuring device according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the electrical measuring device from another perspective; Figure 3 for Figure 1 A schematic diagram of the exploded structure of the electrical measuring device shown. Figure 4 for Figure 3 A schematic diagram of the exploded structure of the electrical measuring device from another perspective; Figure 5 For along Figure 1 Schematic diagram of the exploded structure of the mid-section line MM; Figure 6 This is a schematic diagram of the detection circuit for mode 2 electrical measurement. Figure 7 The logic block diagram for grounding reuse of the charging interface.

[0019] The annotations in the attached figures are explained as follows: 100. Magnetic adsorption electrical measuring device; 1. Electromagnetic conductor; 11. Conductive detection surface; 10. Housing; 2. Elastic conductive component; 3. Main control board; 31. Tactile switch; 4. Battery; 5. Button; 6. Lighting; 7. Charging interface. Detailed Implementation

[0020] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "setup," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] To better understand the solution of this invention, the following are explanations of relevant terms and core concepts: 1- Conductive Magnet: Refers to a functional component that possesses both good electrical conductivity and magnetic properties. It can be a permanent magnet or an electromagnet. The conductive magnet is the core of this invention, integrating three functions: (a) Mechanical Adsorption Component: Utilizing its magnetic adsorption to the surface of a ferromagnetic metal; (b) Electrical Contact Probe: Its exposed conductive surface is used for direct or indirect contact with the conductive object under test to collect electrical signals; (c) Current Conducting Path: Serving as a conductor in the detection circuit, guiding the signal into the internal circuit. Its implementation includes, but is not limited to: a composite material consisting of a dense conductive layer of nickel, gold, etc., plated on the surface of a permanent magnet such as neodymium iron boron, or a conductive magnet made of a special magnetic alloy material that inherently possesses good conductivity.

[0023] 2-Series connection: guides the electromagnet to achieve electrical connection with the detection circuit, and becomes a functional conductive link in the detection loop, used to transmit the electrical signal from its detection surface to the detection circuit.

[0024] 3-Detection circuit: refers to the general term for electronic circuit modules used to process the electrical signals collected by the conductive magnet, determine whether there is voltage or electric field, and then drive the operation of sound, light and other indicators.

[0025] 4- A closed loop is formed between the high-impedance input terminal and the feedback path: This is a preferred circuit architecture for achieving high-performance detection in this invention. The "high-impedance input terminal" typically refers to the non-inverting or inverting input terminal of an operational amplifier or voltage comparator, with extremely high input impedance (usually above 1MΩ). This minimizes the impact on the preceding signal, facilitating the pickup of weak induced signals, and effectively picking up weak signals transmitted via the conductive magnet without causing significant load effects. The "feedback path" refers to the circuit path leading from the output of the signal processing unit back to its input terminal or the connection point of the conductive magnet, typically including a feedback resistor. This feedback path, together with the high-impedance input terminal and the conductive magnet, forms an electrical "closed loop." This structure makes the conductive magnet the only external interface of this closed loop, used for both signal input and current return detection, thus eliminating the need for a separate dedicated grounding electrode.

[0026] 5-Conductive Extension Tool: This refers to a common hand tool with a conductive shaft and an insulated handle, such as an insulated-handle screwdriver, wrench, or metal rod. The device of this invention can be attached to its shaft, transforming the tool into a flexibly controllable extension probe.

[0027] 6-Conductive Surface: A broad term referring to any conductive surface that can form a stable electrical contact with the conductive magnet of this invention. It can be a grounded metal surface (such as a distribution box cabinet or water pipe), in which case the device itself constitutes a detection circuit; it can also be an ungrounded but conductive object surface, through which current can flow when the object comes into contact with a charged body; it can also be the shaft of a conductive extension tool, which becomes part of the detection path when the conductive magnet is attracted to the tool shaft.

[0028] 7-Elastic conductive component: A component used to achieve a reliable electrical connection between the conductive magnet and the internal main control board. Its elasticity is used to compensate for tolerances, buffer vibrations, and ensure contact pressure. It includes, but is not limited to, helical springs, conductive silicone (containing conductive particles), metal spring sheets, or spring claws made of beryllium copper alloy.

[0029] 8-Grounding Conductive Part: Refers to the electrical part on the charging interface (such as USB Type-C, Micro-USB) used to implement the grounding function. It can be a dedicated grounding pin (GND pin) or the metal casing (shield) of the charging interface. In this invention, this part is designed to be reused in the detection circuit.

[0030] 9-Switching Unit: A controlled circuit switching device used to change the electrical connection path. In this invention, it is used to switch the grounding conductive part of the charging interface to the charging management circuit or the detection circuit according to the charging state. It can be a mechanical switch (such as a pin switch triggered by the insertion of a USB plug) or an electronic switch (such as a single-pole double-throw analog switch chip, such as the common CD4053 or TS3A5017, etc.), controlled by the main control board according to the detected charging voltage.

[0031] Example 1: refer to Figures 1 to 5 This embodiment provides a basic form of a magnetic adsorption electrical measuring device 100, which includes a housing 10 made of insulating material. A conductive magnet 1 is fixed to one end of the housing 10, and the conductive detection surface 11 of the conductive magnet 1 slightly protrudes from the end of the housing 10 to facilitate contact with the object being measured. The conductive magnet 1 is electrically connected to a main control board 3 installed inside the housing 10 via an elastic conductive element 2, which in this example is a helical spring. The main control board 3 integrates a detection circuit (not shown separately in the figure, its function is implemented by the main control board), a battery 4 powering the entire device, and necessary control chips. A button 5 is provided on the housing 10, its position corresponding to a tactile switch 31 on the main control board 3. A light 6, such as an LED, is connected to the main control board 3. The button 5 triggers the tactile switch 31 to provide local illumination in dimly lit environments.

[0032] It should be noted that the core of this solution lies in the fact that the conductive magnet 1 serves as the detection probe and mounting adsorption component of the magnetic adsorption measuring device 100, and the conductive magnet 1 is connected in series in the detection circuit of the detection circuit. Therefore, this invention does not concern itself with whether the conductive magnet 1 is electrically connected to the main control board 3 through the elastic conductive element 2, or through a wire or other conductive structure, or directly to the main control board 3. It is also possible for the magnetic adsorption measuring device 100 of this invention to have a charging function, or to be powered by a wire connected to a power strip, and whether it has a lighting function is not limited.

[0033] The basic principle of this invention is to transform a conductive magnet 1 from a traditional mechanical accessory into a core functional component connected in series with the detection circuit of the measuring device 100. This fundamental change makes the conductive magnet 1 simultaneously serve as: ① a mechanical adsorption component; ② an electrical signal probe; and ③ a current conduction path.

[0034] Based on this core architecture, the detection loop can be formed in two main modes, the difference being the electrical connection point (i.e., grounding method) between the device and the ground: Mode 1 (with the aid of an additional grounding electrode): The electrical grounding point of the device is an additional grounding electrode (such as the metal part of a USB multiplexer interface, or a dedicated metal plate on the casing) independent of the conductive magnet 1. The grounding electrode is electrically connected to the grounding loop node of the detection circuit, and this electrode needs to be touched by a human body to connect to the earth.

[0035] Mode 2 (grounded by a conductive magnet): When the device is attached to a grounded metal surface via a conductive magnet, the conductive magnet serves not only as a signal probe but also as the device's grounding outlet. For Mode 2, the conductive magnet 1 is grounded itself. To fully leverage the advantages of this mode in non-contact sensing and achieve optimal performance such as high sensitivity and high anti-interference, it is typically combined with a specific internal circuit design as described in Example 2.

[0036] For both Mode 1 and Mode 2, regardless of the subsequent grounding method, the first step in the operation of this device is to contact or attach the conductive magnet 1 to a conductive surface. This conductive surface may be the charged object to be tested, or it may be an intermediate conductor (such as a grounding metal or conductive tool) used to establish a grounding connection. This embodiment primarily demonstrates how to transform the conductive magnet 1 from an "accessory" into an indispensable series conductive component in the detection circuit. This eliminates the need for a separate, dedicated metal tip at the front end of the traditional test pen, achieving integration of the probe and the attachment, simplifying the structure, and laying the foundation for various flexible grounding and application modes. The following embodiments will specifically demonstrate these modes.

[0037] For Mode 1, based on the device in this embodiment, an additional grounding electrode can be provided on its outer casing 10. This grounding electrode is electrically connected to the grounding node of the detection circuit on the main control board 3. This grounding electrode can be: a separate metal plate; or, as described in subsequent embodiments, multiplexed from the metal casing of the charging interface (such as a USB interface) through a switching circuit (disconnected during charging, connected during power testing).

[0038] When performing electrical testing in Mode 1, the user holds the device and touches the grounding electrode with their fingers. The conductive magnet 1 of the device is then brought into contact with the point to be tested (such as a wire conductor). If the point to be tested is energized, the current path is: energized body → conductive magnet 1 → detection circuit → grounding electrode → human body → earth.

[0039] This mode is compatible with the traditional operating habit of requiring the human body to be grounded when using a test pen, but innovatively replaces the "pen tip" at the front end with a multifunctional conductive magnet 1, which enables it to adsorb and fix the object while testing.

[0040] For mode two, the conductive magnet 1 is grounded by itself. This mode is usually used in conjunction with the high-performance circuit described in Example 2 below. When the conductive magnet 1 is attached to a reliably grounded metal surface (such as a distribution box cabinet or water pipe), the metal surface replaces the grounding function of the "human body".

[0041] When using Mode 2 for electrical measurement, the device is attached to a grounded metal surface via the conductive magnet 1. Due to the internal circuit design (see Example 2), the conductive magnet 1 serves as both the signal input and the grounded output. When an AC electric field (such as a live wire) is present nearby, the induced current path is: grounded metal (contact measurement) / spatial electric field (non-contact measurement) → conductive magnet 1 (as an antenna) → detection circuit → same conductive magnet 1 → grounded metal surface → earth.

[0042] This mode completely eliminates the reliance on grounding the human body, achieving "grounding through adsorption." It is particularly suitable for non-contact inductive detection because the quality of the grounding connection established through magnetic adsorption (low impedance, stable) is far superior to the capacitance of the human body, thereby significantly improving detection sensitivity and anti-interference ability, and enabling the device to be used for long-term monitoring in fixed locations.

[0043] Example 2: Core detection circuit supporting mode two This embodiment details the core circuit for achieving high-performance detection, particularly for realizing "single-point interface, high-sensitivity non-contact detection". Figure 6 This is a schematic diagram of the preferred detection circuit of the present invention.

[0044] The core of the detection circuit is a signal processing unit U1, which is preferably an operational amplifier (such as CA3140) or a voltage comparator with high input impedance. One input terminal of this unit U1 (e.g., the inverting input terminal) is configured as a high-impedance input terminal (node ​​A). The conductive magnet M1 is directly and uniquely electrically connected to this node A via a line. The output terminal of the signal processing unit U1 is connected back to the high-impedance input terminal node A through a feedback resistor Rf, thus forming a closed-loop circuit with the conductive magnet M1 and U1 itself. Using the above circuit design, both contact and non-contact measurement scenarios are possible.

[0045] Contact measurement: When the conductive magnet M1 directly contacts the charged body L, the path of the current I is: charged body L → M1 → node A → flows through the interior of U1 or related detection network → U1 output terminal → feedback resistor Rf → flows back to node A and M1 → through the contact point between M1 and the grounding surface → ground GND. In this process, M1 is both the "entry" and "exit" of the current.

[0046] Non-contact induction (NCV): When the device is attached to the grounded surface GND and there is an AC live wire nearby, the alternating electric field couples a small voltage onto the conductive magnet M1. This voltage is applied to the high-impedance node A and is sensitively detected by U1. Simultaneously, the closed-loop structure provides a stable reference and signal return path, greatly enhancing anti-interference capabilities.

[0047] This circuit design fundamentally solves the problem of low sensitivity and false alarms caused by the reliance on unstable "human body capacitance" grounding in traditional test pens. By connecting the conductive magnet M1 to a high-impedance closed loop and utilizing the stable, low-impedance grounding established by its adsorption, an extremely sensitive and stable detection system is constructed. This enables the device to achieve truly "hands-free, self-grounded" high-sensitivity inductive detection.

[0048] Example 3: Application Scenario – Extended Detection This embodiment demonstrates the application method of the device of the present invention in extended detection scenarios. When it is necessary to detect electrical parts located in narrow spaces, high places, or dangerous areas, the operator does not need to risk directly reaching their hands and the device into these areas. The operator selects a common conductive extension tool, such as a metal rod screwdriver with an insulated handle. The magnetic adsorption electrical measuring device 100 of the present invention is stably adsorbed onto the middle or rear of the metal rod of the screwdriver via its conductive magnet 1. At this time, the operator holds the insulated handle and brings the metal tip of the screwdriver to the distant part to be tested (such as a screw on a terminal block). If the part is energized, the current path is: energized terminal → screwdriver tip → screwdriver rod → conductive magnet → internal detection circuit of the device → (through other grounding methods of the device itself, such as mode one or mode two) → ground.

[0049] Technical Problem Solved and its Effects: This method creatively solves the engineering challenge of safe and convenient voltage testing in complex and confined spaces. It instantly transforms ordinary metal tools into an extended probe with intelligent detection capabilities. This effectively extends the operator's safe distance, avoids personal injury risks, and greatly improves the flexibility and accessibility of testing, representing a significant expansion of traditional voltage testing methods.

[0050] Example 4: Functional Integration – Charging Interface Multiplexing Ground refer to Figure 7 This embodiment, based on the aforementioned embodiments (the embodiment applicable to mode one, and the embodiment where mode one and mode two coexist), adds a charging interface (J1) multiplexing function. The housing 10 is provided with a charging interface (such as a USB interface or a Type-C port), and its grounding conductive part is connected to a switching unit (SW1). The main control board 3 continuously monitors the power supply pin voltage of the charging interface through its voltage detection circuit (such as being connected to the AD pin of the MCU through a voltage divider resistor).

[0051] Charging Mode: When the charger is plugged in, the power pin voltage is detected, and the main control board controls the switching unit SW1 to connect the grounding conductive part to the ground terminal of the charging management circuit. At this time, the device enters the charging state, and the detection function can be automatically disabled to ensure safety.

[0052] Testing mode: When the charger is not plugged in, there is no voltage on the power pin. The main control board controls the switching unit SW1 to connect the grounding conductive part to the grounding loop node (grounding reference point) of the detection circuit. At this time, the grounding conductive part (metal shell or grounding pin) of the charging interface acts as the "grounding electrode for human touch" on a traditional test pen.

[0053] This design cleverly resolves the conflict between interface reuse and circuit safety isolation when integrating charging functionality into a compact device. Through a switching unit, the USB interface intelligently switches between "charging ground" and "detection ground," eliminating the need for a separate dedicated grounding electrode, simplifying the housing design, achieving "one port for two purposes," and improving product integration and user experience.

[0054] During operation: The "grounding conductor" of the USB charging interface (J1) is the physical basis for multiplexing. Depending on the actual design, it can be the metal casing of the USB interface (as a mechanical ground point) or a dedicated GND pin as defined in the standard. This component must be brought out to the internal switching unit. The main control MCU determines the external state by continuously monitoring the voltage of the VBUS (bus power) pin of the USB interface. When a charger is plugged in, a voltage of approximately 5V (e.g., 4-6V) appears on VBUS, and the MCU determines it to be in "charging mode." When no charger is plugged in, the VBUS voltage is 0 or extremely low, and the MCU determines it to be in "electrical testing mode." In one specific embodiment, the main control board detects the VBUS pin voltage of the charging interface through a general-purpose input / output pin; when the preset voltage is higher than 4.5V and lasts for more than a preset time of 50ms, it is determined to be in charging mode, and the switching unit is activated. The preset time setting avoids false electrostatic discharge (ESD) detection; the preset time is not limited to 50ms and can be set to any duration. Similarly, the preset voltage is not limited to 4.5V and can be set to any voltage value.

[0055] Based on the above judgment, the MCU sends a control signal to the switching unit (SW1). In charging mode, SW1 connects the ground conductive part to the charging management circuit ground. This is to ensure a safe reference during the charging process. At this time, the MCU usually disables the current testing function simultaneously to avoid danger or interference. In current testing mode, SW1 connects the ground conductive part to the ground loop node of the detection circuit. At this time, the physical exposed metal part of the USB interface completely replaces the metal tail cap on a traditional voltage tester that requires human touch.

[0056] By reusing the grounding circuit through the charging interface, a separate grounding electrode specifically designed for hand contact is eliminated, simplifying the product's casing design and internal layout. Automatic switching logic ensures complete electrical isolation between charging and high-voltage detection states, preventing risks from accidental operation. Users do not need to worry about the grounding method. Simply plug it in to charge, and unplug it for direct voltage testing (at this point, touching the USB metal part is equivalent to traditional operation), achieving a seamless user experience.

[0057] It should be understood that in other embodiments, a switching unit and a component for detecting the pin voltage may not be necessary. The metal casing of the charging interface can be electrically connected to the ground loop node of the detection circuit, and the ground pin of the charging interface can be electrically connected to the charging management circuit of the magnetic adsorption measuring device. In this case, the charging interface has the dual function of charging and acting as a grounding electrode.

[0058] Based on any of the above device embodiments, the electrical measurement method of the present invention mainly includes two modes: Direct Adsorption Detection Method: The conductive magnet 1 of the device is adsorbed onto a conductive surface (such as a grounding cabinet door or metal pipe). This method automatically establishes an electrical connection through adsorption, allowing for electrical testing in either Mode 1 or Mode 2. Tool Extension Detection Method: As described in Example 3, the device is adsorbed onto the shaft of a conductive extension tool, and the tool is used to contact the distant test point for detection. Both methods are based on the core concept of "conductive magnets connected in series in the detection circuit," breaking away from the traditional electrical testing process that requires hand-holding and contact with a specific grounding electrode, providing safer, more flexible, and more reliable detection methods.

[0059] In summary, the embodiments of the present invention have at least the following advantages and positive effects: First, this invention achieves a functional leap for magnets: the magnet (conductive magnet) in this invention transforms from a traditional, circuit-independent mechanical accessory into an essential electrical functional component. It is no longer an add-on but an indispensable link in the current detection path, realizing a qualitative change from "physical adsorption" to "electrical connection." Second, this invention significantly simplifies the front-end structure: since the conductive magnet itself directly acts as an electrical probe, the metal pen tip or probe, which must exist independently in traditional designs specifically for electrical contact, can be eliminated or integrated with the magnet. This reduces the number of parts and simplifies the physical structure of the device's front end. Third, it provides flexible operational extensions and safe detection methods: because the conductive magnet has both adsorption and conductivity functions, the user can attach the entire device to a suitable position on a long-handled conductive tool (such as a metal wrench or screwdriver handle). At this time, the operator holds the insulated handle of the tool and touches the metal tip of the tool to the point to be tested in a distant or confined space; the current then sequentially passes through the tool tip, the tool body, and the conductive magnet into the detection path. This method effectively extends the detection distance, solving the problem of inconvenience in directly operating the measuring device in confined spaces such as deep within the distribution cabinet or behind equipment. Simultaneously, the use of long-handled tools ensures a safe distance between the operator and live parts, improving the safety and convenience of the detection process. Fourth, this invention creates a completely new functional integration platform for measuring devices: connecting the magnet to the circuit opens up entirely new design ideas for measuring technology. This basic architecture makes it possible to subsequently expand advanced functions such as grounding through the magnet itself and constructing new detection circuits, laying the foundation for improving detection convenience and reliability and developing new application models (such as fixed monitoring). Its fundamental innovation lies in breaking the traditional mindset of isolating the magnet from the detection circuit.

[0060] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A magnetic adsorption electrical measuring device, characterized in that, include: Detection circuit; A conductive magnet serves as the detection probe and mounting adsorption component of the magnetic adsorption electrometry device. The electromagnet is connected in series in the detection circuit of the detection circuit.

2. The magnetic adsorption electrical measuring device according to claim 1, characterized in that, The detection circuit includes a signal processing unit with a high-impedance input terminal and a feedback path; The conductive magnet is electrically connected to the high-impedance input terminal and forms a closed loop with the output terminal of the signal processing unit or the reference ground through the feedback path.

3. The magnetic adsorption electrical measuring device according to claim 1, characterized in that, The magnetic adsorption measuring device has an exposed grounding electrode that can be touched, and the grounding electrode is electrically connected to the grounding loop node of the detection circuit.

4. The magnetic adsorption electrical measuring device according to any one of claims 1 to 3, characterized in that, The magnetic adsorption electrical measuring device includes a housing, a battery, and a main control board. The battery and the detection circuit are mounted on the main control board and housed within the housing. The conductive detection surface of the magnetic conductor extends out of the housing. The magnetic conductor is a permanent magnet with a conductive coating on its surface; or... The electromagnet is a magnetic material component that conducts electricity.

5. The magnetic adsorption electrical measuring device according to claim 4, characterized in that, The magnetic adsorption measuring device also includes a button on the housing and a light connected to the main control board. The button corresponds to a switch on the main control board and is used to control the light to turn on and off.

6. The magnetic adsorption electrical measuring device according to claim 4, characterized in that, The magnetic adsorption measuring device also includes a charging interface, which is electrically connected to the main control board and exposed outside the housing, for connecting to an external power source to charge the battery. The metal casing of the charging interface is electrically connected to the grounding loop node of the detection circuit, and the grounding pin of the charging interface is electrically connected to the charging management circuit of the magnetic adsorption measuring device.

7. The magnetic adsorption electrical measuring device according to claim 1, characterized in that, The electromagnet is electrically connected to the detection circuit via an elastic conductive element. The elastic conductive element is a spring, conductive rubber, or metal sheet.

8. A magnetic adsorption electrical measuring device, characterized in that, include: shell; The detection circuit is located inside the housing; as well as A conductive magnet is fixed to the housing and connected in series in the detection circuit of the detection circuit; wherein the structure of the housing and the placement position of the conductive magnet are configured to allow the magnetic adsorption electrometry device to stably contact and electrically connect to the shaft of an independent conductive extension tool through the conductive magnet.

9. A method for measuring electricity, characterized in that, Includes the following steps: Provide a magnetic adsorption electrical measuring device as described in any one of claims 1 to 8; The conductive magnet of the magnetic adsorption measuring device is adsorbed onto a conductive surface. The conductive magnet collects electrical signals, which are then used by the detection circuit for detection.

10. A method for measuring electricity, characterized in that, Includes the following steps: Provide a magnetic adsorption electrical measuring device as described in any one of claims 1 to 8; The magnetic magnet of the magnetic adsorption measuring device is adsorbed onto the shaft of a conductive extension tool. Hold the insulating handle of the conductive extension tool and bring the metal working end of the conductive extension tool into contact with a part to be tested; Electrical detection is performed through the conductive path formed between the electromagnet, the conductive extension tool, and the part to be tested.

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