Novel handheld universal meter
By designing a new handheld multimeter including a central control board and traffic light, the inconvenience of observation caused by dark working environment and thin pointers in the transformer polarity test is solved, and fast and convenient transformer polarity detection is achieved.
Patent Information
- Application Number
- CN202421628205.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-07-10
AI Technical Summary
When conducting transformer polarity tests, the existing multimeter has a dark working environment, too thin pointer and short power connection time, which makes it inconvenient to observe.
A new handheld multimeter was designed, including the installation box, the multimeter body, pointer, contact sensor, central control board, red and green lights. The central control board controls the opening and closing of the battery pack and the opening and closing of the traffic light to automatically detect the polarity of the transformer, avoiding the need for two people to operate simultaneously.
It realizes rapid detection of transformer polarity in dark environments, without reading or observing pointer offset, and is more convenient to operate, avoiding observation difficulties caused by short battery pack power connection time and thin pointer.
Smart Images
Figure CN222882753U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of multimeters, in particular to a novel handheld multimeter. Background Art
[0002] Multimeter is an indispensable measuring instrument in power electronics and other departments. It is generally used to measure voltage, current and resistance. Multimeters are divided into pointer multimeters and digital multimeters according to the display mode. It is a multifunctional and multi-range measuring instrument. Generally, multimeters can measure DC current, DC voltage, AC current, AC voltage, resistance and audio level, etc. Some can also measure AC current, capacitance, inductance and some parameters of semiconductors (such as β). When the multimeter is used to test the polarity of the transformer, it only needs to use the positive and negative bias of the multimeter pointer.
[0003] When the multimeter is used to test the polarity of the transformer, two people are required to cooperate, one to operate the battery pack and the other to operate the multimeter. The operation is inconvenient, and because the working environment is dark, the pointer is too thin, and the power-on time is short, it is difficult to observe. Utility Model Content
[0004] The utility model aims to provide a novel handheld multimeter which can avoid the problem that the pointer is too thin and the power-on time is short, which makes it difficult to observe due to the dark working environment.
[0005] The utility model provides a novel handheld multimeter, comprising:
[0006] An installation box, and a multimeter body installed inside the installation box, wherein a battery pack is embedded and installed at the lower end of the installation box;
[0007] A multimeter body, wherein a pointer is movably arranged on the upper end of the multimeter body, one side of the pointer is fitted on the side of a contact sensor installed on the upper end of the multimeter body, the contact sensor transmits a signal through a wire to the upper end of a central control board embedded in the middle of an installation box, a red light and a green light are arranged on one side of the installation box, and the red light and green light control ends are connected to the central control board through wires.
[0008] Preferably, the installation box is a box-shaped component with openings at the top and bottom, and a rotating cover is rotatably installed on the upper end. The multimeter body and battery pack are respectively arranged inside the upper and lower cavities of the installation box, and the central control board is embedded in the empty groove formed between the upper and lower cavities of the installation box.
[0009] Preferably, a first connecting line is arranged around the interior of the installation box, and a connecting socket is provided at the lower end of the installation box.
[0010] Preferably, the bottoms of the upper and lower inner cavities of the installation box are fixedly mounted with snap-fitting feet, and one side of the multimeter body and the battery pack is fixedly mounted with snap-fitting sleeves, and the snap-fitting sleeves are mounted in matching fashion with the snap-fitting feet.
[0011] Preferably, an identification portion is also arranged at the upper end of the multimeter body, and the identification portion and the upper end of the pointer are installed and protected by a panel.
[0012] Preferably, a second connecting line is movably arranged on the inner side of the rotating cover, and the second connecting line is positioned and installed by a right-angle hook threadedly installed on the inner side of the rotating cover.
[0013] Preferably, the body of the second connecting line is arranged in a spiral bend, plugs are installed at both ends of the second connecting line, a mounting head is fixedly installed on the inner side of the rotating cover, and the plug is movably installed inside the mounting head.
[0014] Preferably, a storage rack is movably mounted on the inner side of the installation box, and the storage rack is provided with two symmetrical groups, and the first connecting line is installed around the upper end of the storage rack.
[0015] Preferably, the storage rack includes a positioning tube fixedly installed inside the installation box and a telescopic rod movably installed inside the upper end of the positioning tube, and a folding rack is fixedly installed on the upper end of the telescopic rod. The folding rack can be arranged in a U shape, and the lower end of the telescopic rod is installed at the bottom of the inner cavity of the positioning tube through a telescopic spring.
[0016] Preferably, a limit strip is fixedly mounted on the side of the telescopic rod, and the limit strip matches the position and size of a limit groove opened on the side of the notch of the inner cavity of the positioning tube.
[0017] The utility model provides a novel handheld multimeter. When conducting a transformer polarity test, the second connecting line of the multimeter body is first connected to the primary and secondary sides of the transformer, and then the first connecting line of the battery pack is connected. At the moment the battery pack is connected, the pointer of the multimeter body deflects in the direction of the pointer. If the pointer deflects in the positive direction, it indicates that the polarity of the transformer is consistent with the connection method, that is, the polarity is negative; if the pointer deflects in the reverse direction, it indicates that the polarity of the transformer is opposite to the connection method, that is, the polarity is positive; the central control board receives the signal from the multimeter body, and then can control the opening and closing of the battery pack. The central control board receives the signal to control the opening and closing of the red light and the green light. There is no need to read and observe the pointer offset, the transformer polarity can be quickly detected, and there is no need for two people to operate at the same time. The opening and closing of the red light and the green light are easy to observe, which avoids the situation that the pointer is too thin and difficult to observe due to the short battery pack connection time and the dark working environment. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.
[0020] Figure 2 This is a schematic diagram of the installation box structure of an embodiment of the utility model.
[0021] Figure 3 The figure is a schematic diagram of the structure of a multimeter body according to an embodiment of the utility model.
[0022] Figure 4 The figure is a schematic diagram of the power connection system of the multimeter body according to the embodiment of the utility model.
[0023] Figure 5 The figure is a schematic diagram of the structure of a rotating cover according to an embodiment of the utility model.
[0024] Figure 6 This is a schematic diagram of the second connecting line structure of an embodiment of the utility model.
[0025] Figure 7 It is a schematic diagram of the storage rack structure of an embodiment of the utility model.
[0026] Description of the drawings: 100, installation box; 110, rotating cover; 111, installation head; 112, right-angle hook; 120, connecting socket; 130, red light; 140, green light; 150, storage rack; 151, positioning tube; 152, telescopic rod; 153, telescopic spring; 154, folding rack; 155, limit strip; 160, snap-fit foot; 170, second connecting line; 171, plug; 180, first connecting line; 200, multimeter body; 210, identification part; 220, contact sensor; 230, pointer; 240, panel; 250, snap-fit sleeve; 300, central control panel. DETAILED DESCRIPTION
[0027] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.
[0028] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.
[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0030] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.
[0031] The disclosure below provides many different embodiments or examples for realizing different structures of the embodiments of the present utility model. In order to simplify the disclosure of the embodiments of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.
[0032] In order to better understand the purpose, structure and function of the utility model, the following is a further detailed description of a novel handheld multimeter of the utility model in conjunction with the accompanying drawings.
[0033] like Figure 1-Figure 7 As shown, an embodiment of the utility model provides a novel handheld multimeter, including an installation box 100 for installing various groups of parts, and a multimeter body 200 installed inside the installation box 100, and a battery pack for providing DC current pulses to the multimeter body 200 is embedded and installed at the lower end of the installation box 100.
[0034] A pointer 230 for indicating the reaction to the current is movably arranged at the upper end of the multimeter body 200. One side of the pointer 230 is fitted on the side of a contact sensor 220 installed at the upper end of the multimeter body 200. The contact sensor 220 transmits the signal through a wire to the upper end of a central control board 300 embedded in the middle of the installation box 100. A red light 130 and a green light 140 for indicating the signal are arranged on one side of the installation box 100. The control ends of the red light 130 and the green light 140 are connected to the central control board 300 through wires.
[0035] A first connecting line 180 for connecting to the battery pack is arranged around the interior of the installation box 100. A connecting socket 120 for connecting the multimeter body 200 and the battery pack is opened at the lower end of the installation box 100. The positions of the two groups of connecting sockets 120 correspond to the positive and negative poles in the battery pack.
[0036] A second connection line 170 for connecting the multimeter body 200 and the mutual inductor is movably arranged inside the rotating cover 110 . The second connection line 170 is positioned and installed through a right-angle hook 112 threadedly installed inside the rotating cover 110 .
[0037] When conducting a transformer polarity test, first connect the second connection line 170 of the multimeter body 200 to the primary and secondary sides of the transformer, and then connect the first connection line 180 of the battery pack. At the moment the battery pack is connected, the pointer 230 of the multimeter body 200 deflects in the direction. If the pointer 230 deflects in the positive direction (usually moves to the right), it indicates that the polarity of the transformer is consistent with the connection method, that is, it is a minus polarity; if the pointer 230 deflects in the reverse direction (moves to the left), it indicates that the polarity of the transformer is opposite to the connection method, that is, it is a plus polarity; the central control board 300 receives the signal from the multimeter body 200, and then can control the opening and closing of the battery pack. The central control board 300 receives the signal to control the opening and closing of the red light 130 and the green light 140, without the need to read the value and observe the offset of the pointer 230, and can quickly detect the polarity of the transformer.
[0038] There is a contact sensor 220 at the starting position of the pointer 230. When the pointer 230 leaves the contact sensor 220, it is positively biased, and when the pointer 230 is attached but not left, it is negatively biased. The signal is transmitted to the central control board 300, and the central control board 300 controls the corresponding red light 130 and green light 140 to light up.
[0039] The contact sensor 220 may be a Hall effect sensor. When the pointer 230 (with magnet) is located above the Hall sensor, the sensor outputs a low level, indicating reverse bias. When the pointer 230 leaves, the Hall sensor loses the magnetic field and outputs a high level, indicating forward bias.
[0040] Furthermore, the installation box 100 is a box-shaped component with openings at the top and bottom, and a rotating cover 110 is rotatably installed on the upper end for protection. The multimeter body 200 and the battery pack are respectively arranged inside the upper and lower cavities of the installation box 100, and the central control board 300 is embedded in the empty groove formed between the upper and lower cavities of the installation box 100.
[0041] Furthermore, the bottom of the upper and lower inner cavities of the installation box 100 are fixedly installed with snap-fitting feet 160 for installing the multimeter body 200 and the battery pack, and one side of the multimeter body 200 and the battery pack is fixedly installed with snap-fitting sleeves 250 for positioning the multimeter body 200 and the battery pack. The snap-fitting sleeves 250 are matched with the snap-fitting feet 160 for conveniently fixing the multimeter body 200 and the battery pack inside the installation box 100, and they can also be disassembled and used separately.
[0042] Furthermore, an identification portion 210 for displaying data of the multimeter body 200 is arranged at the upper end of the multimeter body 200 , and the identification portion 210 and the upper end of the pointer 230 are installed and protected by a panel 240 .
[0043] Furthermore, the second connecting line 170 is arranged in a spiral bending shape, and plugs 171 for connecting to the device are installed at both ends of the second connecting line 170 for connecting to the target device. A mounting head 111 for snap-fitting and fixing the plug 171 is fixedly installed on the inner side of the rotating cover 110, and the plug 171 is movably installed inside the mounting head 111. When not in use, the second connecting line 170 can be placed and summarized for easy use. At the same time, the line body is arranged in a spiral bending shape and can be retracted and extended, so that it can be used according to the length of the stroke.
[0044] Furthermore, a storage rack 150 for installing the first connecting line 180 is movably installed on the inner side of the installation box 100, and the storage rack 150 is provided with two symmetrical groups. The first connecting line 180 is installed around the upper end of the storage rack 150, and the storage rack 150 includes a positioning tube 151 fixedly installed inside the installation box 100 for support and a telescopic rod 152 movably installed inside the upper end of the positioning tube 151, and a retracting frame 154 for fixing the first connecting line 180 is fixedly installed on the upper end of the telescopic rod 152. The retracting frame 154 can be arranged in a U shape, and the lower end of the telescopic rod 152 is installed on the bottom of the inner cavity of the positioning tube 151 through a telescopic spring 153. When the wiring harness needs to be stored, it can also be wrapped around the upper end of the positioning tube 151 inside the installation box 100. The retracting frame 154 movably installed at the upper end can prevent the wiring harness from detaching, which is convenient for storing device parts.
[0045] Furthermore, a limit strip 155 for limiting the telescopic rod 152 is fixedly installed on the side of the telescopic rod 152. The limit strip 155 matches the position and size of the limit groove opened on the side of the inner cavity notch of the positioning tube 151, and the folding frame 154 can be rotationally limited, which is convenient for adjustment according to the different wiring harnesses and connectors and is flexible to use.
[0046] A novel handheld multimeter has a working principle: when testing the polarity of a transformer, first connect the second connecting line 170 of the multimeter body 200 to the primary and secondary sides of the transformer, and then connect the first connecting line 180 of the battery pack. At the moment the battery pack is connected, the pointer 230 of the multimeter body 200 deflects in the direction. If the pointer 230 deflects in the positive direction (usually moves to the right), it indicates that the polarity of the transformer is consistent with the connection method, that is, it is a negative polarity; if the pointer 230 deflects in the reverse direction (moves to the left), it indicates that the polarity of the transformer is positive. The polarity is opposite to the connection method, that is, the plus polarity; the central control board 300 receives the signal from the multimeter body 200, and then can control the opening and closing of the battery pack. The central control board 300 receives the signal to control the opening and closing of the red light 130 and the green light 140. There is no need to read the value and observe the offset of the pointer 230. The polarity of the mutual inductor can be quickly detected without two people operating at the same time. The opening and closing of the red light 130 and the green light 140 are easy to observe, avoiding the short battery pack connection time, the dark working environment, and the pointer 230 being too thin and difficult to observe.
[0047] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.
Claims
1. A new type of handheld multimeter, characterized in that: include: An installation box, and a multimeter body installed inside the installation box, wherein a battery pack is embedded and installed at the lower end of the installation box; A multimeter body, wherein a pointer is movably arranged on the upper end of the multimeter body, one side of the pointer is fitted on the side of a contact sensor installed on the upper end of the multimeter body, the contact sensor transmits a signal through a wire to the upper end of a central control board embedded in the middle of an installation box, a red light and a green light are arranged on one side of the installation box, and the red light and green light control ends are connected to the central control board through wires.
2. A novel handheld multimeter according to claim 1, characterized in that: The installation box is a box-shaped component with openings at the top and bottom, and a rotating cover is rotatably installed on the upper end. The multimeter body and the battery pack are respectively arranged inside the upper and lower cavities of the installation box, and the central control board is embedded in the empty groove formed between the upper and lower cavities of the installation box.
3. A novel handheld multimeter according to claim 2, characterized in that: A first connecting line is arranged around the interior of the installation box, and a connecting socket is opened at the lower end of the installation box.
4. A novel handheld multimeter according to claim 3, characterized in that: The bottoms of the upper and lower inner cavities of the installation box are both fixedly mounted with snap-fitting feet, and one side of the multimeter body and the battery pack is both fixedly mounted with snap-fitting sleeves, which are matched and mounted with the snap-fitting feet.
5. A novel handheld multimeter according to claim 4, characterized in that: The upper end of the multimeter body is also provided with an identification portion, and the identification portion and the upper end of the pointer are installed and protected by a panel.
6. A novel handheld multimeter according to claim 5, characterized in that: A second connecting line is movably arranged on the inner side of the rotating cover, and the second connecting line is positioned and installed through a right-angle hook threadedly installed on the inner side of the rotating cover.
7. A novel handheld multimeter according to claim 6, characterized in that: The body of the second connecting line is arranged in a spiral bend, plugs are installed at both ends of the second connecting line, a mounting head is fixedly installed on the inner side of the rotating cover, and the plug is movably installed inside the mounting head.
8. A novel handheld multimeter according to claim 7, characterized in that: A storage rack is movably mounted on the inner side of the installation box. The storage rack is provided with two symmetrical groups. The first connecting line is installed around the upper end of the storage rack.
9. A novel handheld multimeter according to claim 8, characterized in that: The storage rack includes a positioning tube fixedly installed inside the installation box and a telescopic rod movably installed inside the upper end of the positioning tube. A folding rack is fixedly installed on the upper end of the telescopic rod. The folding rack can be arranged in a U shape. The lower end of the telescopic rod is installed at the bottom of the inner cavity of the positioning tube through a telescopic spring.
10. A novel handheld multimeter according to claim 9, characterized in that: A limiting strip is fixedly installed on the side of the telescopic rod, and the position and size of the limiting strip match the limiting groove opened on the side of the notch of the inner cavity of the positioning tube.