Device and method for realizing voltage detection

Abstract

The invention discloses a device and method for realizing voltage detection, and relates to the technical field of voltage detection.The device comprises a voltage measuring body, the inner side of the voltage measuring body is fixedly connected with a lower bottom plate and an upper bottom plate, the lower bottom plate and the upper bottom plate are jointly provided with an inner side resistor series assembly, and rotation of a rotating rod can drive a moving disc to move back and forth in the vertical direction; the moving disc moves to drive the multiple sets of movable plates to move, the movable plates move to push the sliding plates to move back and forth in the horizontal direction, the sliding plates move to drive the sliding feeler levers to make contact with the wires, the multiple sets of resistors are in a series connection state, and a series-parallel connection adjusting assembly is arranged on the lower bottom plate. The sliding plate moves to drive the arch-shaped elastic plates to move, the multiple sets of arch-shaped elastic plates make contact with the two ends of the wire at the same time, the arch-shaped elastic plates extrude the second springs, the multiple sets of resistors are in a parallel connection state and are connected with the parallel connection column, and the pressure measuring body is fixedly connected with an external connection column.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage detection, and in particular to a device and method for realizing voltage detection. Background Art

[0002] In scenarios such as power, electronic equipment research and development, industrial production, and daily circuit maintenance, voltage detection is a core link to ensure stable system operation. During the electronic equipment research and development stage, voltage detection is a key means to verify circuit performance and troubleshoot design defects. R&D personnel ensure that the equipment operates normally within the specified voltage range by detecting the voltage of each node, thereby improving product reliability.

[0003] Traditional voltage detection devices restrict the efficiency of actual applications. In terms of range adaptability, their fixed range design leads to the need to frequently replace instruments of different ranges when facing scenarios with large high and low voltage spans. This is not only cumbersome to operate, but may also lead to measurement errors due to untimely replacement. In terms of accuracy and stability, electronic components are prone to aging due to factors such as ambient temperature and humidity, which increases the error of measurement results and reduces stability. Equipping multiple specifications of instruments to meet the needs of multiple scenarios not only increases procurement and inventory costs, but also requires operators to master the use of different instruments, affecting the overall efficiency of detection work. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the existing technology, such as the fixed range design, which results in the need to frequently replace instruments of different ranges when facing scenarios with large high and low voltage spans. The electronic components are prone to aging due to factors such as ambient temperature and humidity. The equipment of various specifications of instruments affects the overall efficiency of the detection work. A device and method for realizing voltage detection are proposed to solve the shortcomings of the existing technology, such as the fixed range design, which results in the need to frequently replace instruments of different ranges when facing scenarios with large high and low voltage spans.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A device for realizing voltage detection comprises a pressure measuring body, wherein a lower base plate and an upper base plate are fixedly connected to the inner side of the pressure measuring body, an inner resistor series assembly is commonly provided on the lower base plate and the upper base plate, the inner resistor series assembly comprises a rotating rod and a movable disk provided on the upper base plate, a plurality of movable plates movably connected to the outer side of the movable disk, a sliding plate movably connected to the outer side of the movable plate, a sliding contact rod and a first spring provided inside the sliding plate, and a plurality of sections of wires provided on the lower base plate, the wires being provided with resistors, the rotation of the rotating rod drives the movable disk to move back and forth in the vertical direction, the movement of the movable disk drives the plurality of groups of movable plates to move, the movement of the movable plate pushes the sliding plate to move back and forth in the horizontal direction, the movement of the sliding plate drives the sliding contact rod to contact the wires, and the plurality of groups of resistors are in a series state;

[0007] A series-parallel adjustment component is provided on the lower base plate, and the series-parallel adjustment component includes a connecting rod provided on the sliding plate, a bow-shaped spring plate and a second spring provided on the outside of the connecting rod, multiple groups of flexible wires fixedly connected to the outside of the sliding plates, parallel columns fixedly connected to the outside of the flexible wires, and series columns fixedly connected to the outside of the wires. The rotation of the rotating rod will drive the multiple groups of sliding plates to move horizontally, and the movement of the sliding plates will drive the bow-shaped spring plates to move. The multiple groups of bow-shaped spring plates are in contact with both ends of the wires at the same time, and the bow-shaped spring plates will squeeze the second spring. The multiple groups of resistors are in parallel and connected to the parallel columns. An external column is fixedly connected to the pressure measuring body.

[0008] The above technical solution further includes:

[0009] Preferably, the lower base plate is fixedly connected to one side thereof close to the upper base plate with a plurality of groups of support columns, the plurality of groups of support columns are evenly distributed in a circle along the lower base plate, and the ends of the plurality of groups of support columns away from the lower base plate are fixedly connected to the upper base plate, and the support columns mainly play the role of supporting connection.

[0010] Preferably, the outer sides of the lower base plate and the upper base plate are rotatably connected to the rotating rod, the rotating rod and the movable disk are threadedly connected, and the outer side of the movable disk is fixedly connected to multiple groups of fixed shafts, and the multiple groups of fixed shafts are evenly distributed along the circumference of the movable disk. The movement of the movable disk in the vertical direction can drive the movement of multiple fixed shafts.

[0011] Preferably, the outer side of the fixed shaft is movably connected to the movable plate, the end of the movable plate away from the fixed shaft is movably connected to an H-shaped block, the lower part of the H-shaped block is fixedly connected to the sliding plate, and the movement of the movable plate can push the H-shaped block to move in the horizontal direction.

[0012] Preferably, the upper part of the lower base plate is fixedly connected with multiple groups of cross bars, and the multiple groups of cross bars are evenly distributed along the circumference of the lower base plate. Sliding grooves are opened inside the cross bars, and the inner side of the sliding grooves is slidably connected to the sliding plate. The movement of the H-shaped block will push the sliding plate to slide on the inner side of the sliding groove.

[0013] Preferably, the inner side of the sliding plate is slidably connected to the sliding touch rod, and the number of the sliding touch rods is two groups, and the opposite ends of the two groups of sliding touch rods are fixedly connected to the first spring. The two groups of sliding touch rods will simultaneously squeeze the first spring inward.

[0014] Preferably, the upper part of the lower base plate is fixedly connected with multiple groups of limit blocks, and the multiple groups of limit blocks are fixedly connected to the wires together, the size of the wires is adapted to the size of the sliding touch rod, the outer side of the wires is fixedly connected with a third wire, the outer side of the wires is fixedly connected to the resistor, and the end of the third wire away from the wires is fixedly connected to the series column.

[0015] Preferably, a movable groove is symmetrically provided on the outer side of the sliding plate, the inner side of the movable groove is fixedly connected to the connecting rod, the outer side of the connecting rod is movably connected to the bow-shaped spring plate, the bow-shaped spring plate and the movable groove are fixedly connected to the second spring, and the movement of the connecting rod will drive the bow-shaped spring plate to move.

[0016] Preferably, multiple groups of connecting rods are fixedly connected between a common end away from the lower base plate and a flexible wire, the outer side of the flexible wire is fixedly connected with a first wire and a second wire, and the first wire and the second wire are fixedly connected between a common end away from the flexible wire and a parallel column.

[0017] A method for implementing voltage detection includes the following steps:

[0018] Step 1: By connecting multiple resistors in series, the total resistance is the sum of the individual resistors, which can achieve the required high internal resistance. By rotating the rotating rod, the movable plate can be driven to move back and forth in the vertical direction. The movement of the movable plate can drive the movable plate to move, and the movement of the movable plate can drive the sliding plate to move in the horizontal direction.

[0019] Step 2: When the sliding plate moves, the sliding contact rods come into contact with the wires. The two sets of sliding contact rods press the first springs. The sliding contact rods, the first springs, and the wires come into contact with each other, and the multiple resistors are connected in series.

[0020] Step 3: By connecting resistors in parallel, the total internal resistance of the voltmeter can be fine-tuned to improve measurement accuracy. When the sliding plate moves in the horizontal direction, it will drive the connecting rod to move. During the movement of the sliding plate, the bow-shaped spring plate will contact the wire, and the bow-shaped spring plate will squeeze the second spring. The wire, the bow-shaped spring plate and the connecting rod will contact each other. The connecting rod is connected to the flexible wire, and multiple resistors are connected in parallel.

[0021] The present invention has the following beneficial effects:

[0022] 1. In the present invention, by providing an inner resistor series assembly, the rotating rod rotates to drive the movable plate to move in the vertical direction, thereby pushing the movable plate and the sliding plate to move in the horizontal direction, and finally making the sliding contact rod contact the resistors on the wire, thereby realizing multiple groups of resistors in series. This design allows the resistors to be dynamically connected to the circuit as needed, and flexibly adjust the voltage detection range of the device. In the series state, the total resistance increases, which can adapt to the detection requirements of higher voltages, while ensuring the accuracy and stability of the detection. In addition, the series connection of resistors through mechanical structure reduces the use of electronic components, reduces the complexity and cost of the device, and improves reliability.

[0023] 2. In the present invention, further, by setting up a series-parallel adjustment component, by rotating the rotating rod, multiple sets of sliding plates can be driven to move horizontally, so that the bow-shaped spring plate contacts the two ends of the wire and squeezes the second spring, thereby realizing the parallel connection of multiple sets of resistors. At the same time, the parallel column can connect the parallel resistors to the circuit.

[0024] 3. In the present invention, further, this design enables the device to flexibly adjust the connection method of the resistors. When it is necessary to measure voltages of different ranges or accuracies, the series and parallel states of the resistors can be quickly switched to expand the measurement range and improve the measurement accuracy. When the resistors are connected in parallel, the total resistance decreases and the current increases, which is suitable for measuring smaller voltages or scenarios requiring higher sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of a device and method for realizing voltage detection proposed by the present invention;

[0026] Figure 2 Schematic diagram of the structure of the series-parallel adjustment component in the present invention;

[0027] Figure 3 Schematic diagram of the structure of the series-parallel adjustment assembly in the present invention from a bottom view;

[0028] Figure 4 It is a partial structural diagram of the series-parallel adjustment component in the present invention;

[0029] Figure 5 It is a partial cross-sectional structural schematic diagram of the series-parallel adjustment component in the present invention;

[0030] Figure 6 for Figure 4 A schematic diagram of the structure at center A;

[0031] Figure 7 for Figure 4 A magnified schematic diagram of the structure at point B in the middle;

[0032] Figure 8 for Figure 2 Enlarged schematic diagram of the structure at point C in the middle.

[0033] In the figure: 1. pressure measuring body; 2. lower base plate; 3. support column; 4. upper base plate; 5. rotating rod; 6. movable disk; 7. fixed shaft; 8. movable plate; 9. cross bar; 10. sliding groove; 11. sliding plate; 12. H-shaped block; 13. sliding contact rod; 14. first spring; 15. wire; 16. limit block; 17. movable groove; 18. connecting rod; 19. bow-shaped spring plate; 20. second spring; 21. flexible wire; 22. first wire; 23. second wire; 24. parallel column; 25. third wire; 26. series column; 27. external column; 28. resistor. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] Example 1

[0036] like Figures 1-8 As shown, the present invention proposes a device for realizing voltage detection, comprising a pressure measuring body 1, wherein a lower base plate 2 and an upper base plate 4 are fixedly connected to the inner side of the pressure measuring body 1, an inner resistance series assembly is commonly provided on the lower base plate 2 and the upper base plate 4, the inner resistance series assembly comprises a rotating rod 5 and a movable disk 6 provided on the upper base plate 4, a plurality of movable plates 8 movably connected to the outer side of the movable disk 6, a sliding plate 11 movably connected to the outer side of the movable plate 8, a sliding contact rod 13 and a first spring 14 provided inside the sliding plate 11, and a plurality of sections of wires 15 provided on the lower base plate 2, a resistor 28 is provided on the wire 15, the rotation of the rotating rod 5 drives the movable disk 6 to move back and forth in the vertical direction, the movement of the movable disk 6 drives the plurality of groups of movable plates 8 to move, the movement of the movable plate 8 pushes the sliding plate 11 to move back and forth in the horizontal direction, the movement of the sliding plate 11 drives the sliding contact rod 13 to contact the wire 15, and the plurality of groups of resistors 28 are in a series state;

[0037] A series-parallel adjustment component is provided on the lower base plate 2, and the series-parallel adjustment component includes a connecting rod 18 provided on the sliding plate 11, a bow-shaped spring plate 19 and a second spring 20 provided on the outside of the connecting rod 18, multiple groups of flexible wires 21 fixedly connected to the outside of the sliding plates 11, parallel columns 24 fixedly connected to the outside of the flexible wires 21, and series columns 26 fixedly connected to the outside of the wires 15. The rotation of the rotating rod 5 will drive the multiple groups of sliding plates 11 to move horizontally, and the movement of the sliding plates 11 will drive the bow-shaped spring plates 19 to move. The multiple groups of bow-shaped spring plates 19 are in contact with both ends of the wire 15 at the same time. The bow-shaped spring plates 19 will squeeze the second spring 20, and the multiple groups of resistors 28 are in parallel and connected to the parallel columns 24. An external column 27 is fixedly connected to the pressure measuring body 1.

[0038] Multiple groups of support columns 3 are fixedly connected to one side of the lower base plate 2 close to the upper base plate 4. The multiple groups of support columns 3 are evenly distributed in a circle along the lower base plate 2. The ends of the multiple groups of support columns 3 away from the lower base plate 2 are fixedly connected to the upper base plate 4. The support columns 3 mainly play a supporting and connecting role.

[0039] The outer sides of the lower base plate 2 and the upper base plate 4 are rotatably connected to the rotating rod 5, the rotating rod 5 and the movable disk 6 are threadedly connected, and the outer side of the movable disk 6 is fixedly connected to multiple groups of fixed shafts 7, which are evenly distributed along the circumference of the movable disk 6. The movement of the movable disk 6 in the vertical direction can drive the multiple fixed shafts 7 to move.

[0040] The outer side of the fixed shaft 7 is movably connected to the movable plate 8. The end of the movable plate 8 away from the fixed shaft 7 is movably connected to an H-shaped block 12. The lower part of the H-shaped block 12 is fixedly connected to the sliding plate 11. The movement of the movable plate 8 can push the H-shaped block 12 to move in the horizontal direction.

[0041] The upper part of the lower base plate 2 is fixedly connected with multiple groups of cross bars 9, which are evenly distributed along the circumference of the lower base plate 2. A sliding groove 10 is opened inside the cross bar 9, and the inner side of the sliding groove 10 is slidably connected to the sliding plate 11. The movement of the H-shaped block 12 will push the sliding plate 11 to slide on the inner side of the sliding groove 10.

[0042] The inner side of the sliding plate 11 is slidably connected to the sliding contact rod 13. There are two groups of sliding contact rods 13. The opposite ends of the two groups of sliding contact rods 13 are fixedly connected to the first spring 14. The two groups of sliding contact rods 13 will simultaneously squeeze the first spring 14 inward.

[0043] Multiple sets of limit blocks 16 are fixedly connected to the upper part of the lower base plate 2, and the multiple sets of limit blocks 16 are fixedly connected to the wire 15. The size of the wire 15 is adapted to the size of the sliding contact rod 13. A third wire 25 is fixedly connected to the outer side of the wire 15. The outer side of the wire 15 is fixedly connected to the resistor 28, and the end of the third wire 25 away from the wire 15 is fixedly connected to the series column 26.

[0044] In this embodiment, the specific implementation method is that by connecting multiple resistors in series, the total resistance is the sum of the resistors, and the required high internal resistance can be achieved. By rotating the rotating rod 5, the movable plate 6 can be driven to move back and forth in the vertical direction. The movement of the movable plate 6 in the vertical direction can drive multiple fixed shafts 7 to move, and the movement of the fixed shaft 7 can drive the movable plate 8 to move. The movement of the movable plate 8 can push the H-shaped block 12 to move in the horizontal direction. The H-shaped block 12 is in contact with the cross bar 9. Because the H-shaped block 12 and the sliding plate 11 are fixedly connected, the movement of the H-shaped block 12 will push the sliding plate 11 to slide on the inside of the sliding groove 10, and the sliding plate 11 slides on the inside of the cross bar 9. During the process, the sliding of the sliding plate 11 will simultaneously drive the sliding contact rod 13 and the first spring 14 to move. When the sliding plate 11 moves to the appropriate position, the two sets of sliding contact rods 13 will contact the two sections of wires 15 at the same time, and the two sets of sliding contact rods 13 will also squeeze the first spring 14 inward at the same time. At this time, the sliding contact rod 13, the first spring 14 and the wire 15 are in contact with each other, and the multiple resistors 28 are connected in series. The limit block 16 can fix the wire 15. The outside of the wire 15 is connected to the third wire 25, and finally realizes the connection with the series column 26. When the external series column 26 is connected, the rotating rod 5 is rotated to realize the series connection of the resistors inside the pressure measuring body 1.

[0045] Example 2

[0046] like Figures 1-8 As shown, based on the first embodiment, a movable groove 17 is symmetrically opened on the outer side of the sliding plate 11, the inner side of the movable groove 17 is fixedly connected to the connecting rod 18, the outer side of the connecting rod 18 is movably connected to the bow-shaped spring plate 19, the bow-shaped spring plate 19 and the movable groove 17 are fixedly connected to the second spring 20, and the movement of the connecting rod 18 will drive the bow-shaped spring plate 19 to move.

[0047] The ends of the multiple groups of connecting rods 18 away from the lower base plate 2 are fixedly connected to the flexible wire 21, the outer side of the flexible wire 21 is fixedly connected to the first wire 22 and the second wire 23, and the ends of the first wire 22 and the second wire 23 away from the flexible wire 21 are fixedly connected to the parallel column 24.

[0048] In this embodiment, further, by connecting resistors in parallel, the total internal resistance of the voltmeter can be fine-tuned to improve the measurement accuracy. The specific implementation method is that when the series connection is adjusted to the parallel connection, the rotating rod 5 needs to be rotated further. At this time, when the sliding plate 11 moves in the horizontal direction, the connecting rod 18 is driven to move. The movement of the connecting rod 18 drives the bow spring plate 19 to move. The bow spring plate 19 contacts the wire 15 during the movement. It is worth noting that at this time, the bow spring plates 19 on both sides of the sliding plate 11 are in contact with the wire 15 respectively. When the bow spring plate 19 contacts the wire 15 The bow-shaped spring plate 19 will squeeze the second spring 20, and the end of the second spring 20 away from the bow-shaped spring plate 19 is fixedly connected to the movable groove 17. When the bow-shaped spring plate 19 is not in contact with the wire 15, the second spring 20 can return the bow-shaped spring plate 19 to its initial position. Multiple groups of connecting rods 18 are connected to the flexible wire 21. The outside of the flexible wire 21 is connected to the first wire 22 and the second wire 23. The first wire 22 and the second wire 23 are connected to the parallel column 24. When the external parallel column 24 is connected, the rotating rod 5 is rotated to realize the parallel connection of the resistors inside the pressure measuring body 1.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for realizing voltage detection, comprising a pressure measuring body (1), characterized in that: The inner side of the pressure measuring body (1) is fixedly connected to a lower base plate (2) and an upper base plate (4); an inner resistance series assembly is commonly provided on the lower base plate (2) and the upper base plate (4); the inner resistance series assembly comprises a rotating rod (5) and a movable disk (6) provided on the upper base plate (4); a plurality of movable plates (8) movably connected to the outer side of the movable disk (6); a sliding plate (11) movably connected to the outer side of the movable plate (8); a sliding contact rod (13) and a first spring (14) provided inside the sliding plate (11); and a plurality of wires (15) arranged on the lower base plate (2), wherein the wires (15) are provided with resistors (28), wherein the rotation of the rotating rod (5) drives the movable disk (6) to move back and forth in the vertical direction, the movement of the movable disk (6) drives the plurality of movable plates (8) to move, the movement of the movable plates (8) drives the sliding plates (11) to move back and forth in the horizontal direction, the movement of the sliding plates (11) drives the sliding contact rods (13) to contact the wires (15), and the plurality of resistors (28) are in a series state; The lower base plate (2) is provided with a series-parallel adjustment component, which includes a connecting rod (18) provided on the sliding plate (11), a bow-shaped spring plate (19) and a second spring (20) provided on the outer side of the connecting rod (18), a plurality of flexible wires (21) fixedly connected to the outer sides of the sliding plates (11), a parallel column (24) fixedly connected to the outer sides of the flexible wires (21), and a series column (26) fixedly connected to the outer sides of the wires (15). The rotation of the rotating rod (5) drives the plurality of sliding plates (11) to move in a horizontal direction. The movement of the sliding plates (11) drives the bow-shaped spring plates (19) to move. The plurality of bow-shaped spring plates (19) are in contact with both ends of the wires (15) at the same time. The bow-shaped spring plates (19) squeeze the second spring (20). The plurality of resistors (28) are in a parallel state and connected to the parallel column (24). An external column (27) is fixedly connected to the pressure measuring body (1).

2. The device for realizing voltage detection according to claim 1, characterized in that: A plurality of groups of support columns (3) are fixedly connected to one side of the lower base plate (2) close to the upper base plate (4), the plurality of groups of support columns (3) are evenly distributed along the circumference of the lower base plate (2), and the ends of the plurality of groups of support columns (3) away from the lower base plate (2) are fixedly connected to the upper base plate (4).

3. The device for realizing voltage detection according to claim 1, characterized in that: The outer sides of the lower base plate (2) and the upper base plate (4) are rotatably connected to a rotating rod (5), the rotating rod (5) and the movable disk (6) are threadedly connected, and the outer side of the movable disk (6) is fixedly connected to multiple groups of fixed shafts (7), and the multiple groups of fixed shafts (7) are evenly distributed along the circumference of the movable disk (6).

4. The device for realizing voltage detection according to claim 3, characterized in that: The outer side of the fixed shaft (7) is movably connected to the movable plate (8), and the end of the movable plate (8) away from the fixed shaft (7) is movably connected to an H-shaped block (12), and the lower part of the H-shaped block (12) is fixedly connected to the sliding plate (11).

5. The device for realizing voltage detection according to claim 1, characterized in that: The upper portion of the lower base plate (2) is fixedly connected to a plurality of groups of cross bars (9), which are evenly distributed along the circumference of the lower base plate (2). Sliding grooves (10) are provided inside the cross bars (9), and the inner sides of the sliding grooves (10) are slidably connected to the sliding plates (11).

6. The device for realizing voltage detection according to claim 1, characterized in that: The inner side of the sliding plate (11) is slidably connected to the sliding contact rod (13). The sliding contact rod (13) is provided in two groups. The opposite ends of the two groups of sliding contact rods (13) are fixedly connected to the first spring (14).

7. The device for realizing voltage detection according to claim 1, characterized in that: The upper portion of the lower base plate (2) is fixedly connected to a plurality of groups of limit blocks (16), the plurality of groups of limit blocks (16) are fixedly connected to the wire (15), the size of the wire (15) is adapted to the size of the sliding contact rod (13), a third wire (25) is fixedly connected to the outer side of the wire (15), the outer side of the wire (15) is fixedly connected to the resistor (28), and an end of the third wire (25) away from the wire (15) is fixedly connected to the series column (26).

8. The device for realizing voltage detection according to claim 1, characterized in that: A movable groove (17) is symmetrically provided on the outer side of the sliding plate (11); the inner side of the movable groove (17) is fixedly connected to a connecting rod (18); the outer side of the connecting rod (18) is movably connected to a bow-shaped spring plate (19); and the bow-shaped spring plate (19) and the movable groove (17) are fixedly connected to a second spring (20).

9. The device for realizing voltage detection according to claim 1, characterized in that: The ends of the multiple groups of connecting rods (18) away from the lower base plate (2) are fixedly connected to the flexible wire (21); the outer side of the flexible wire (21) is fixedly connected to the first wire (22) and the second wire (23); the ends of the first wire (22) and the second wire (23) away from the flexible wire (21) are fixedly connected to the parallel column (24).

10. A method for realizing voltage detection, using the device for realizing voltage detection according to claim 1, characterized in that: The steps include: Step 1: By connecting multiple resistors in series, the total resistance is the sum of the resistors, and the required high internal resistance can be achieved. By rotating the rotating rod (5), the movable plate (6) can be driven to move back and forth in the vertical direction. The movement of the movable plate (6) can drive the movable plate (8) to move, and the movement of the movable plate (8) can drive the sliding plate (11) to move in the horizontal direction. Step 2: When the sliding plate (11) moves, the sliding contact rod (13) contacts the wire (15) during the movement of the sliding plate (11), and the two sets of sliding contact rods (13) press the first spring (14). The sliding contact rods (13), the first spring (14) and the wire (15) contact each other, and the multiple resistors (28) are connected in series. Step 3: By connecting resistors in parallel, the total internal resistance of the voltmeter can be fine-tuned to improve measurement accuracy. When the sliding plate (11) moves in the horizontal direction, it drives the connecting rod (18) to move. During the movement of the sliding plate (11), the bow-shaped spring plate (19) contacts the wire (15). The bow-shaped spring plate (19) squeezes the second spring (20). The wire (15), the bow-shaped spring plate (19) and the connecting rod (18) contact each other. The connecting rod (18) is connected to the flexible wire (21). Multiple resistors (28) are connected in parallel.

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