Wire-change-free device for universal meter detection

Abstract

The invention discloses a wire-change-free device for universal meter detection, and relates to the technical field of electric power detection universal meters. The device comprises a shell, a display screen and a control panel, the shell comprises a lower shell body and an upper shell body, a storage battery is installed on the lower half portion in the lower shell body, and a control panel is installed on the upper half portion in the lower shell body. The control board is provided with a main control chip, and an AC voltage detection board, a DC voltage detection board, an AC current detection board, a DC current detection board, a resistance detection board, a video output detection board and an audio output detection board which are electrically connected with the main control chip. The lower half part of the upper shell is provided with a downward flat cable groove, and the upper half part of the upper shell is provided with a display screen groove. According to the invention, a touch control mode is adopted to replace a large amount of wire plugging and changing operations during gear switching in the detection process of a universal meter, and the problems of misoperation, high detection accident rate, large equipment loss, long detection time and the like caused by repeated wire changing in the prior art are solved.

Description

Technical Field

[0001] This invention belongs to the field of power multimeter testing technology, and in particular relates to a wire-replacement-free device for multimeter testing. Background Technology

[0002] The multimeter testing device standard source can output five signals: DC voltage, AC voltage, DC current, AC current, and resistance. When measuring with a multimeter, two test leads are needed to connect the standard source and the multimeter to form a test circuit. One test lead connects the output terminal of the standard source to the corresponding test terminal of the multimeter, and the other test lead connects the common terminal of the standard source to the common terminal of the multimeter.

[0003] When testing different ranges of a multimeter, the test leads need to be disconnected from the standard source and the multimeter, and then reconnected to the new test circuit. If you need to test five ranges of a multimeter—AC voltage, DC voltage, AC current, DC current, and resistance—in sequence, you will need to perform five wiring operations in total. This results in repeated plugging and unplugging of test leads during the testing process, increasing the likelihood of testing accidents.

[0004] If traditional methods are used, depending on the meter model and the operator's skill level, the testing time for a single multimeter is 5-15 minutes, and the wire switching operation is performed 5-6 times.

[0005] Therefore, replacing the numerous plugging and unplugging operations required for switching ranges during multimeter testing with a button-based (or touch-screen) operation will improve operational efficiency and reduce error rates. To this end, we provide a cable-replacement-free multimeter testing device to solve the aforementioned problems. Summary of the Invention

[0006] The purpose of this invention is to provide a multimeter testing device that eliminates the need for cable replacement. By using a touch-screen interface, it replaces the numerous plugging and unplugging operations required when switching ranges during multimeter testing, thus solving the problems of operational errors, high accident rates, significant equipment wear and tear, and long testing times caused by repeated cable replacements.

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0008] This invention relates to a multimeter testing device that eliminates the need for cable replacement, comprising a housing, a display screen, and a control board. The housing includes a lower housing and an upper housing, both of which are square boxes. The top of the lower housing is inserted into the bottom of the upper housing and fixed at the insertion position with bolts.

[0009] A battery is installed in the lower half of the lower housing, and a control board is installed in the upper half of the lower housing. The control board is equipped with a main control chip and AC voltage detection board, DC voltage detection board, AC current detection board, DC current detection board, resistance detection board, video output detection board and audio output detection board that are electrically connected to the main control chip. The battery supplies power to the entire control board.

[0010] The lower half of the upper housing has a downward-facing cable tray, and the upper half of the upper housing has a display screen tray. The upper housing has multiple sets of test wire connection holes on the two side walls of the cable tray. The display screen is snapped into the display screen tray. The test wires installed from each set of test wire connection holes are electrically connected to the corresponding AC voltage detection board, DC voltage detection board, AC current detection board, DC current detection board, resistance detection board, video output detection board, and audio output detection board. The upper cable of the display screen runs from the bottom of the display screen tray of the upper housing down to the main control chip.

[0011] The invention is further configured such that the control board is installed inside a shielding assembly, the shielding assembly including a metal base plate and a metal cover, the metal base plate being fixed to a mounting plate, a column being fixed at each of the four corners of the lower housing, the mounting plate resting on the columns at the four corners and being fixed with bolts, four square-distributed mounting cylinders being fixed to the metal base plate, the control board being mounted on the mounting cylinders with bolts, the metal cover being box-shaped with an open bottom, the bottom of the metal cover having four outwardly extending mounting edges, the mounting edges pressing against the edges of the metal base plate and being fixed with bolts.

[0012] The invention is further configured such that the lower housing has an array of exhaust holes on the two opposite side walls of the upper half, and a set of cooling fans is installed on the edge of the mounting plate near the set of exhaust holes. The cooling fans exhaust air toward the metal cover, and the surface of the metal cover has uniformly distributed heat dissipation holes. Both the metal base plate and the metal cover are made of aluminum alloy.

[0013] The invention is further configured such that the bottom of the lower housing is provided with four retaining strips close to the four inner side walls, the retaining strips forming a square space, the bottom of the battery is secured within the square space formed by the retaining strips, and two U-shaped fastening strips 3 are fastened to the outer wall of the battery. The U-shaped fastening strips 3 have outwardly extending mounting portions at both ends, the mounting portions are attached to the retaining strips and fixed with bolts.

[0014] The present invention is further configured such that a square platform is provided on the top of the inner wall of the lower housing, and a plug is formed by the indentation of the bottom outer wall of the upper housing 8. The plug is inserted into the top of the lower housing and abuts against the square platform, and is screwed into the plug from the top wall of the lower housing with a bolt.

[0015] The present invention is further configured such that the main control chip includes an STM32C8T6 chip, a T20 board, a T20-2 board, multiple port5 boards, and multiple port10 boards; the AC voltage detection board includes a DCV+ board and a DCV- board; the DC voltage detection board includes a DCA+ board and a DCA- board; the AC current detection board includes a DCA+ board and a DCA- board; the DC current detection board includes a DCV+ board and a DCV- board; the resistance detection board includes an R+ board and an R- board; the video output detection board includes a WVAZ1 board and a WA2 board; and the audio output detection board includes a WmA3 board and a WCOM board.

[0016] The present invention is further configured such that the display screen is a touch display screen, and the display screen displays data detected by the AC voltage detection board, DC voltage detection board, AC current detection board, DC current detection board, resistance detection board, video output detection board and audio output detection board in different areas.

[0017] The present invention is further configured such that an audible and visual alarm is installed in the wiring groove of the upper housing, and the audible and visual alarm is electrically connected to the main control chip.

[0018] The present invention has the following beneficial effects:

[0019] 1. This invention replaces the numerous plugging and unplugging operations required when switching ranges during multimeter testing with a touchscreen or button, thereby avoiding operational errors caused by repeated wire changes, reducing the incidence of testing accidents, reducing equipment wear and tear, and shortening testing time.

[0020] 2. The control board of this invention, which eliminates the need for cable replacement, has a reasonable layout of various module control boards, which can effectively control a variety of power tests and can realize 7 types of tests. The signals generated by the control board are easy to interfere with the display screen and surrounding equipment, and are also easily interfered with by external equipment. Therefore, a shielding cover is designed to shield external interference and the control board from external interference.

[0021] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments 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 these drawings without creative effort.

[0023] Figure 1 This is an exploded structural diagram of a multimeter testing device that does not require wire replacement.

[0024] Figure 2 This is a schematic diagram of the lower shell structure.

[0025] Figure 3 This is a structural diagram of the mounting plate and the metal base plate.

[0026] Figure 4 This is a schematic diagram of the metal cover.

[0027] Figure 5 This is a schematic diagram of the upper shell structure (viewed from the bottom).

[0028] Figure 6 This is a schematic diagram of the upper shell structure (viewed from the top).

[0029] Figure 7 This is a schematic diagram showing the location of the main control chip on the control board and each detection board.

[0030] Figure 8 Schematic diagram of the distribution of various circuit boards on the main control chip

[0031] Figure 9 This is the circuit diagram of the main control chip and each detection board.

[0032] Figure 10 A schematic diagram of the main control chip and various detection boards arranged on the computer (and...) Figure 7 and Figure 8 correspond).

[0033] The attached diagram lists the components represented by each number as follows:

[0034] 1. Lower housing; 11. Column; 12. Locking strip; 13. Exhaust vent; 14. Square platform; 2. Battery; 3. U-shaped fastening strip; 4. Mounting plate; 41. Cooling fan; 5. Metal base plate; 51. Mounting cylinder; 6. Control board; 7. Metal cover; 71. Mounting edge; 8. Upper housing; 81. Cable tray; 82. Plug; 83. Cable tray; 84. Display screen tray; 9. Display screen. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figure 1-10A multimeter testing device that eliminates the need for cable replacement includes a housing, a display screen, and a control board. The housing comprises a lower housing 1 and an upper housing 8, both of which are square boxes. The top of the lower housing 1 is inserted into the bottom of the upper housing 8 and fixed at the insertion position with bolts.

[0037] The lower half of the lower housing 1 is equipped with a storage battery 2, and the upper half of the lower housing 1 is equipped with a control board 6. The control board 6 is equipped with a main control chip and AC voltage detection board, DC voltage detection board, AC current detection board, DC current detection board, resistance detection board, video output detection board and audio output detection board that are electrically connected to the main control chip. The storage battery supplies power to the entire control board.

[0038] The lower half of the upper housing 8 is provided with a downward-facing cable tray 81, and the upper half of the upper housing 8 is provided with a display screen tray 84. The upper housing 8 has multiple sets of test wire connection holes 83 on the two side walls of the cable tray. The display screen 9 is snapped into the display screen tray 84. The test wires installed from each set of test wire connection holes 83 are electrically connected to the corresponding AC voltage detection board, DC voltage detection board, AC current detection board, DC current detection board, resistance detection board, video output detection board, and audio output detection board. The upper cable of the display screen 9 passes through the bottom of the display screen tray 84 of the upper housing 8 and connects to the main control chip.

[0039] The power supply battery is positioned at the bottom for easy fixation. The control board is located above the battery, in the upper half of the lower housing 1. Opening or removing the upper housing 8 reveals the control board, allowing for quick and easy inspection without disassembling it. Figure 7-10 The seven monitoring and test board combinations on the control board are arranged in sequence, with five connection ports on one side (DCVin, ACVin, Rin, DCAin, and ACAin, which are the interfaces for the AC voltage detection board, DC voltage detection board, resistance detection board, AC current detection board, and DC current detection board, respectively), and two connection ports on the other side (vAout and mACOM, which are the interfaces for the video output detection board and audio output detection board, respectively). When arranging cables in the cable tray 81, the cables can be arranged in an orderly manner and connected to the corresponding connection ports. They can then be orderly pulled out from the corresponding test wire connection holes 83, preventing the test wires from getting tangled in the cable tray 81. This also facilitates later maintenance and testing of the circuit. During power testing, the orderly design is conducive to efficient testing, allowing test heads to be quickly picked up and inserted or connected to the corresponding test positions as required.

[0040] The control board 6 is installed inside the shielding assembly, which includes a metal base plate 5 and a metal cover 7. The metal base plate 5 is fixed on a mounting plate 4. A column 11 is fixed at each of the four corners inside the lower housing 1. The four corners of the mounting plate 4 rest on the columns 11 and are fixed with bolts. Four square-shaped mounting cylinders 51 are fixed on the metal base plate 5. The control board 6 is bolted to the mounting cylinders 51. The metal cover 7 is box-shaped with an open bottom. The four sides of the bottom of the metal cover 7 have outwardly extending mounting edges 71. The mounting edges 71 press against the edge of the metal base plate 5 and are fixed with bolts.

[0041] For multi-functional test boards, each test board emits different interfering magnetic field lines, which can interfere with surrounding equipment and are also susceptible to interference from other equipment. A metal base plate 5 and a metal cover 7 are installed, which, when fastened together, form a shielding cover to effectively block interference signals or magnetic field lines. The metal cover 7 has evenly spaced small holes for heat dissipation.

[0042] The lower housing 1 has an array of exhaust holes 13 on the two opposite side walls of the upper half. A set of cooling fans 41 is installed on the edge of the mounting plate 4 near the set of exhaust holes 13. The cooling fans 41 exhaust air towards the metal cover. The surface of the metal cover 7 has small heat dissipation holes evenly distributed. Both the metal base plate 5 and the metal cover 7 are made of aluminum alloy.

[0043] Two sets of exhaust vents 13 are provided; one set is close to the cooling fan 41 and serves as an air intake, while the other set is an exhaust vent. The airflow blown into the metal cover 7 carries away heat without affecting the protection of the shielding box.

[0044] The lower housing 1 has four retaining strips 12 near the four inner side walls at its bottom. The retaining strips 12 form a square space. The bottom of the battery 2 is secured within the square space formed by the retaining strips and fastened to the outer wall of the battery by two U-shaped fastening strips 3. The U-shaped fastening strips 3 have outwardly extending mounting parts at both ends. The mounting parts are attached to the retaining strips 12 and fixed with bolts.

[0045] The battery is easy to install. It is directly clipped into the four clips 12, secured to the outer wall of the battery with two U-shaped fastening strips 3, and then fixed with bolts. The battery is not mounted against the wall, which allows for some heat dissipation. Since it is not a high-power or highly intelligent instrument, the power consumption is stable and the battery will not overheat. There is no need to set up an independent cooling system. Heat dissipation is sufficient through the lower casing wall.

[0046] The lower housing 1 has a square platform 14 on the top of its inner wall. The bottom outer wall of the upper housing 8 is recessed to form a plug 82. The plug 82 is inserted into the top of the lower housing 8 and rests against the square platform 14. A bolt is screwed into the plug 82 from the top wall of the lower housing 8.

[0047] After plugging in, simply tighten with bolts; disassembly is also convenient.

[0048] The main control chip includes an STM32C8T6 chip, a T20 board, a T20-2 board, multiple port 5 boards, and multiple port 10 boards. The AC voltage detection board includes a DCV+ board and a DCV- board. The DC voltage detection board includes a DCA+ board and a DCA- board. The AC current detection board includes a DCA+ board and a DCA- board. The DC current detection board includes a DCV+ board and a DCV- board. The resistance detection board includes an R+ board and an R- board. The video output detection board includes a WVAZ1 board and a WA2 board. The audio output detection board includes a WmA3 board and a WCOM board.

[0049] The T20 board and T20-2 board are connected to both sides of the STM32C8T6 chip respectively. These are port replicator boards, facilitating the connection of multiple board interfaces and preventing pin density issues caused by connecting all interfaces to the STM32C8T6 chip. Figure 9 The diagram shows the circuit structure of the DCV+ and DCV- boards, DCA+ and DCA- boards, DCA+ and DCA- boards, DCV+ and DCV- boards, R+ and R- boards, WVAZ1 and WA2 boards, WmA3 and WCOM boards. These circuit boards are available for purchase, but the arrangement follows the original design to achieve intelligent control during testing. The STM32F103C8T6, a 32-bit microcontroller based on the ARM Cortex-M3 core from STMicroelectronics, enables efficient regulation and control, allowing simultaneous testing of multiple electrical devices or instruments without the need for plugging and unplugging. Buttons (located on the upper casing or via touchscreen) replace the extensive plugging and unplugging operations required when switching ranges with a multimeter, avoiding errors caused by repeated wire changes, reducing the incidence of testing accidents, minimizing equipment wear, and shortening testing time. Pin connections are made according to pin numbers.

[0050] The display screen 9 is a touch screen, which displays data detected by the AC voltage detection board, DC voltage detection board, AC current detection board, DC current detection board, resistance detection board, video output detection board and audio output detection board in different areas.

[0051] The division by area is based on the installation position of the test lines. This way, the display screen above each test line shows the corresponding test data and controls the corresponding test.

[0052] An audible and visual alarm is installed in the wiring trough 81 of the upper housing, and the audible and visual alarm is electrically connected to the main control chip.

[0053] It features protection and isolation circuitry to protect the control board from overvoltage and transient voltages.

[0054] The device has one-button start and reset functions.

[0055] The device has an audible and visual alarm function, which can provide audible and visual alarms for errors such as overvoltage and incorrect wiring.

[0056] The equipment should support both external power supply and internal power supply (external power supply connection port and charging interface are not shown). With external backup power supply, it should support stable operation for ≥8 hours.

[0057] The device interface includes the following interfaces: a 220V power interface for external power input; digital input / output ports for connecting external expansion devices; and a power interface providing 12V and 5V power outputs.

[0058] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0059] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multimeter testing device that eliminates the need for cable replacement, comprising a housing, a display screen, and a control board; characterized in that: The outer shell includes a lower shell (1) and an upper shell (8), both of which are square boxes. The top of the lower shell (1) is inserted into the bottom of the upper shell (8) and fixed at the insertion position with bolts. A battery (2) is installed in the lower half of the lower housing (1), and a control board (6) is installed in the upper half of the lower housing (1). The control board (6) is equipped with a main control chip and AC voltage detection board, DC voltage detection board, AC current detection board, DC current detection board, resistance detection board, video output detection board and audio output detection board that are electrically connected to the main control chip. The battery supplies power to the entire control board. The lower half of the upper housing (8) is provided with a downward-facing cable tray (81), and the upper half of the upper housing (8) is provided with a display screen tray (84). The upper housing (8) has multiple sets of test wire connection holes (83) on the two side walls of the cable tray. The display screen (9) is snapped into the display screen tray (84). The test wires installed from each set of test wire connection holes (83) are electrically connected to the corresponding AC voltage detection board, DC voltage detection board, AC current detection board, DC current detection board, resistance detection board, video output detection board and audio output detection board. The upper cable of the display screen (9) passes through the bottom of the display screen tray (84) of the upper housing (8) and connects to the main control chip.

2. The multimeter testing device without cable replacement according to claim 1, characterized in that, The control board (6) is installed inside the shielding assembly, which includes a metal base plate (5) and a metal cover (7). The metal base plate (5) is fixed on a mounting plate (4). A column (11) is fixed at each of the four corners of the lower housing (1). The four corners of the mounting plate (4) rest on the column (11) and are fixed with bolts. Four square-shaped mounting cylinders (51) are fixed on the metal base plate (5). The control board (6) is installed on the mounting cylinders (51) with bolts. The metal cover (7) is box-shaped with an open bottom. The bottom four sides of the metal cover (7) are provided with outwardly extending mounting edges (71). The mounting edges (71) press against the edge of the metal base plate (5) and are fixed with bolts.

3. The multimeter testing device without cable replacement according to claim 2, characterized in that, The lower housing (1) has an array of exhaust holes (13) on the two opposite side walls of the upper half. A set of cooling fans (41) is installed on the edge of the mounting plate (4) near the set of exhaust holes (13). The cooling fans (41) exhaust air towards the metal cover. The surface of the metal cover (7) is evenly distributed with small heat dissipation holes. The metal base plate (5) and the metal cover (7) are both made of aluminum alloy.

4. The multimeter testing device without cable replacement according to claim 1, characterized in that, The bottom of the lower housing (1) is provided with four retaining strips (12) close to the four inner side walls. The retaining strips (12) form a square space. The bottom of the battery (2) is fitted into the square space formed by the retaining strips and fastened to the outer wall of the battery with two U-shaped fastening strips (3). The U-shaped fastening strips (3) have outwardly extending mounting parts at both ends. The mounting parts are attached to the retaining strips (12) and fixed with bolts.

5. A multimeter testing device without cable replacement according to claim 1, characterized in that, The lower housing (1) has a square platform (14) on the top of its inner wall. The upper housing (8) has a plug (82) formed by the indentation of its bottom outer wall. The plug (82) is inserted into the top of the lower housing (8) and rests against the square platform (14). A bolt is screwed into the plug (82) from the top wall of the lower housing (8).

6. The multimeter testing device without cable replacement according to claim 1, characterized in that, The main control chip includes an STM32C8T6 chip, a T20 board, a T20-2 board, multiple port 5 boards, and multiple port 10 boards. The AC voltage detection board includes a DCV+ board and a DCV- board. The DC voltage detection board includes a DCA+ board and a DCA- board. The AC current detection board includes a DCA+ board and a DCA- board. The DC current detection board includes a DCV+ board and a DCV- board. The resistance detection board includes an R+ board and an R- board. The video output detection board includes a WVAZ1 board and a WA2 board. The audio output detection board includes a WmA3 board and a WCOM board.

7. A multimeter testing device without cable replacement according to claim 1, characterized in that, The display screen (9) is a touch screen, and the display screen (9) displays data detected by the AC voltage detection board, DC voltage detection board, AC current detection board, DC current detection board, resistance detection board, video output detection board and audio output detection board by area.

8. The multimeter testing device without cable replacement according to claim 1, characterized in that, An audible and visual alarm is installed in the wiring trough (81) of the upper housing, and the audible and visual alarm is electrically connected to the main control chip.

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