A digital multimeter calibration device

Abstract

The present invention belongs to nuclear power detection technology, and specifically relates to a digital multimeter calibration device. It includes a calibrator body, a mounting plate, an adjustment device and a fixing device; the adjustment device includes a bolt rod, a threaded tube and an adjustment plate; the fixing device includes two fixing plates located on both sides of the calibrator body and a support plate located below the calibrator body. In addition, the designed mounting structure can fix the mounting plate on the roof of the detection room, and the calibrator body can be placed through the support plate. By rotating the adjustment bolt, the two clamps can fix and clamp the calibrator body in the fixing device, thereby improving the stability of the calibrator body. Through the threaded fit between the bolt rod and the threaded tube, the height of the calibrator body can be adjusted by rotating the threaded tube, making the calibration more convenient, reducing the clutter of the calibration environment, reducing the impact on the calibration results, reducing the calibration limitations and reducing the calibration errors.

Description

Technical Field

[0001] The invention belongs to nuclear power detection technology, and in particular relates to a digital multimeter calibration device. Background Art

[0002] A multimeter is a magnetoelectric instrument with a rectifier that can measure multiple electrical parameters such as AC and DC current, voltage and resistance. For each electrical quantity, there are generally several ranges. It is also called a multimeter or simply a multimeter. A multimeter is composed of a magnetoelectric ammeter (meter head), a measuring circuit and a selection switch. By changing the selection switch, a variety of electrical parameters can be easily measured. The main basis for its circuit calculation is Ohm's law of closed circuit. There are many types of multimeters, and they should be selected according to different requirements when used.

[0003] Before a multimeter is used before leaving the factory, it is often necessary to calibrate it so that it has better accuracy. There are many ways to calibrate a multimeter in the prior art. The multimeter can be sent to a metrology institute for calibration, or a meter with higher accuracy can be selected to measure the same quantity as the multimeter to be tested, such as voltage, current, etc., and the readings can be compared, measured and corrected. However, the calibration efficiency of the above calibration methods is low, so a multimeter calibration instrument has appeared on the market, which can directly test the multimeters to be calibrated, has high efficiency, and can be tested in batches. However, the multimeter calibration instrument often needs to be placed on the same calibration table with the multimeter to be tested when in use. If multiple multimeters are tested at the same time, coupled with the circuits of the existing multimeter calibration instrument itself, the calibration environment on the calibration table will be messy, which can easily affect the calibration results. Therefore, there are many limitations and errors in its use. Summary of the invention

[0004] The purpose of the present invention is to provide a digital multimeter calibration device capable of reducing calibration errors.

[0005] The technical solution of the present invention is as follows:

[0006] A digital multimeter calibration device comprises a calibrator body, a mounting plate located above the calibrator body, an adjustment device installed between the mounting plate and the calibrator body, and a fixing device for fixing the calibrator body;

[0007] The adjusting device comprises a bolt rod, a threaded tube and an adjusting plate; the bottom end of the threaded tube is rotatably connected to the adjusting plate, the lower end of the bolt rod is threadedly connected to the threaded tube below, the top end of the bolt rod is fixedly connected to the center of the above-mentioned mounting plate, and when the threaded tube rotates, the relative position with the bolt rod above can be changed through the thread;

[0008] The fixing device includes two fixing plates located on both sides of the calibrator body and a supporting plate located below the calibrator body. The top of the fixing plate is connected to the adjusting plate, and the bottom is connected to the supporting plate. The calibrator body is placed on the supporting plate. The fixing plate is connected to the transverse adjusting screw through a thread. A splint is installed on the end of the adjusting screw close to the calibrator body. The splints on both sides of the calibrator body are driven to move relative to each other by rotating the adjusting screw.

[0009] The mounting plate is provided with a mounting structure through a mounting shaft hole; the mounting structure includes a mounting rod and a connecting spring, the mounting rod passes through the mounting plate through the mounting through hole, and the connecting spring is sleeved on the portion of the mounting rod located below the mounting plate, the top end of the connecting spring is connected to the bottom end of the mounting plate, the bottom end of the mounting rod is laterally connected to a push plate, the bottom end of the connecting spring is connected to the top end of the push plate, and the push plate pushes the mounting rod to compress the connecting spring.

[0010] The left and right sides of the upper end of the mounting rod are respectively processed with steering grooves with semicircular cross-sections, and steering sleeves are rotatably arranged inside the steering grooves, and the outer sides of each steering sleeve are connected to a vertical rotating rod.

[0011] The lower end of the rotating rod is processed into an inclined surface facing inward.

[0012] The top ends of the mounting rods are all configured as pointed structures.

[0013] The adjustment device also includes a sleeve and a directional rod installed below the mounting plate. The directional rod is inserted into the lower side of the sleeve. The bottom end of the directional rod is fixedly connected to the four corners of the top of the adjustment plate.

[0014] The outside of the threaded tube is provided with a leather cover with anti-slip patterns.

[0015] The outer part of the bolt rod is threaded with a fastening nut.

[0016] The adjusting screw is provided with a hand wheel.

[0017] A transverse orientation structure is provided between the fixed plate and the clamping plate and is evenly distributed on the transverse cross-section of the calibrator body. The orientation structure includes an orientation tube and an orientation column respectively connected to the clamping plate and the fixed plate. One end of the orientation column is inserted into the interior of the orientation tube, and the orientation column and the orientation tube are slidably matched.

[0018] The remarkable effects of the present invention are as follows:

[0019] 1. The digital multimeter calibration device can fix the mounting plate on the roof of the test room through the cooperation of the mounting plate and the mounting structure, and the calibration instrument body can be placed through the support plate. By rotating the adjusting bolt, the two clamping plates can fix the calibration instrument body in the fixing device, thereby improving the stability of the calibration instrument body. Through the screw fit between the bolt rod and the threaded tube, the use height of the calibration instrument body can be adjusted by rotating the threaded tube, making the calibration more convenient and adaptable, reducing the confusion caused by placing the calibration instrument body directly on the calibration table, reducing the clutter of the calibration environment, reducing the impact on the calibration results, reducing the calibration limitations and reducing the calibration errors.

[0020] 2. When installing the mounting plate of the digital multimeter calibration device, a through hole is opened at a corresponding position on the roof wall of the detection room, aligned with the mounting through hole on the mounting plate, and the mounting rod is pushed by a push plate to compress the connecting spring, and the upper area of ​​the mounting rod passes through the through hole in the roof and extends to the upper side of the roof wall. The push plate is released, and the mounting rod slides downward under the elastic force of the connecting spring. At this time, the bottom of the rotating rod contacts the top of the roof wall, and the rotating rod is rotated to a horizontal position by rotating the rotating rod. With the elastic force of the connecting spring, the mounting plate can be fixed on the roof wall, and the installation is more convenient.

[0021] 3. The digital multimeter calibration device can place calibration tools such as the calibration probe of the calibrator body through the placement box, thereby improving the protection of the calibration probe of the calibrator body, reducing the phenomenon of damage due to random placement, making it more convenient to use and the detection environment more regular. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a digital multimeter calibration device;

[0023] Figure 2 for Figure 1 A schematic diagram of the local enlarged structure at point A in the middle;

[0024] Figure 3 It is a left view structural diagram of the connection between the rotating rod, the steering box mounting rod, etc.;

[0025] In the figure: 1. Calibrator body; 2. Mounting plate; 3. Bolt rod; 4. Threaded pipe; 5. Adjustment plate; 6. Sleeve; 7. Orientation rod; 8. Adjustment screw; 9. Clamp; 10. Placement box; 11. Mounting rod; 12. Connecting spring; 13. Push plate; 14. Steering groove; 15. Steering sleeve; 16. Rotating rod; 17. Pointed structure; 18. Inclined surface; 19. Orientation cylinder; 20. Orientation column; 21. Handwheel; 22. Leather cover; 23. Fastening nut; 24. Fixing plate; 25. Support plate. DETAILED DESCRIPTION

[0026] The present invention will be further described below through the accompanying drawings and specific implementation methods.

[0027] like Figure 1 A digital multimeter calibration device is shown, which includes a calibrator body 1, a mounting plate 2 located above the calibrator body 1, an adjustment device installed between the mounting plate 2 and the calibrator body 1, and a fixing device for installing and fixing the calibrator body 1.

[0028] In this embodiment, the four corners of the mounting plate 2 are all provided with mounting through holes that penetrate from top to bottom, and each mounting through hole is used to install a mounting structure for fixing the mounting plate 2;

[0029] like Figure 2 and Figure 3 As shown, the mounting structure includes a mounting rod 11 and a connecting spring 12. The mounting rod 11 passes through the above-mentioned mounting plate 2 through a mounting through hole, and the connecting spring 12 is sleeved on the portion of the mounting rod 11 located below the mounting plate 2. The top end of the connecting spring 12 is connected to the bottom end of the mounting plate 2. The bottom end of the mounting rod 11 is laterally connected to a push plate 13. The bottom end of the connecting spring 12 is connected to the top end of the push plate 13. The push plate 13 pushes the mounting rod 11 to compress the connecting spring 12.

[0030] Semicircular turning grooves 14 are processed on both sides of the upper end of the mounting rod 11, and turning sleeves 15 are rotatably arranged inside the turning grooves 14. The outer sides of the turning sleeves 15 are connected to the vertical rotating rods 16. When the rotating rods 16 are in a static state without rotation, the inner sides of the rotating rods 16 are in contact with the outer wall of the mounting rod 11. The lower ends of the rotating rods 16 are processed into inclined surfaces 18 facing inward, which reduce the contact area between the bottom ends of the rotating rods 16 and the roof wall, so as to facilitate the rotating rods 16 to be better rotated and opened for use.

[0031] It should also be noted that the top end of the mounting rod 11 is configured as a pointed structure 17 , and the pointed structure 17 makes it easier for the mounting rod 11 to be inserted upward into the through hole of the roof wall.

[0032] When installing the mounting plate 2, a through hole is opened at a corresponding position on the roof wall of the detection room, aligned with the mounting through hole on the mounting plate 2, and the mounting rod 11 is pushed by the push plate 13 to compress the connecting spring 12, and the upper area of ​​the mounting rod 11 passes through the through hole in the roof and extends to the upper side of the roof wall, and the push plate 13 is released. The mounting rod 11 slides downward under the elastic force of the connecting spring 12. At this time, the bottom of the rotating rod 16 contacts the top of the roof wall. The rotating rod 16 is rotated to a horizontal position, and the elastic force of the connecting spring 12 is cooperated, so that the mounting plate 2 can be fixed on the roof wall, and the installation is more convenient.

[0033] The number of the mounting structures can be multiple, 4, 6 or more, and they can be evenly distributed on the mounting plate 2.

[0034] like Figure 1 As shown, the adjusting device is located between the mounting plate 2 and the calibrator body 1 , and the adjusting device includes a bolt rod 3 , a threaded tube 4 and an adjusting plate 5 .

[0035] The bottom end of the threaded tube 4 is rotatably connected to the adjusting plate 5 (i.e., the adjusting plate 5 is processed with a mounting hole, and the lower end of the threaded tube 4 is located in the mounting hole and can rotate but the up and down movement is limited). The lower end of the bolt rod 3 is threadedly connected to the threaded tube 4 below, and the top end of the bolt rod 3 is fixedly connected to the center of the above-mentioned mounting plate 2. When the threaded tube 4 rotates, the relative position of the threaded tube 4 and the upper bolt rod 3 can change through the thread.

[0036] A sleeve 6 is installed below the mounting plate 2, and a directional rod 7 is inserted into the lower side of each sleeve 6, and the bottom end of the directional rod 7 is fixedly connected to the four corners of the top of the adjustment plate 5 respectively;

[0037] When the threaded tube 4 rotates, the adjusting plate 5 below is driven to move up and down, and the directional rods 7 and sleeves 6 at both ends change position, so that the calibration instrument body 1 and the adjusting plate 5 move up and down together.

[0038] The outer fixing sleeve of the threaded tube 4 is provided with a leather cover 22 with anti-skid patterns, so that the user can adjust the use height of the calibration instrument body 1 by rotating the threaded tube 4 to increase friction and reduce slipping.

[0039] In addition, a fastening nut 23 can be screwed on the outside of the bolt rod 3. The fastening nut 23 can be turned downward to make the fastening nut 23 and the top end of the threaded tube 4 in a locking contact, thereby ensuring the screwing and fastening ability between the bolt rod 3 and the threaded tube 4, and tightening the adjusted position between the bolt rod 3 and the threaded tube 4, thereby improving the reliability of use.

[0040] like Figure 3 As shown, the function of the fixing device is to fix the calibration instrument body 1 and the adjustment plate 5.

[0041] The fixing device includes two fixing plates 24 located on both sides of the calibrator body 1 and a support plate 25 located below the calibrator body. The top of the fixing plate 24 is connected to the adjustment plate 5, and the bottom is connected to the support plate 25. The calibrator body 1 is placed on the support plate 25.

[0042] A threaded through hole is processed in the center of the fixing plate 24, and an adjusting screw 8 is installed through the threaded through hole. A clamping plate 9 is installed on the end of the adjusting screw 8 close to the calibration instrument body 1. The rotation of the adjusting screw 8 drives the clamping plates 9 on both sides of the calibration instrument body 1 to move relative to each other, so that the clamping plates 9 on the left and right sides of the calibration instrument body 1 are respectively pressed against the two ends of the calibration instrument body 1, which plays a positioning role for the calibration instrument body 1. In order to facilitate the rotation of the adjusting screw 8, a handwheel 21 is installed on the adjusting screw 8. At the same time, the handwheel 21 also facilitates the clamping and disassembly of the calibration instrument body 1.

[0043] Several directional structures (4, 6 or other) are installed between the fixed plate 24 and the clamping plate 9 on each side and are evenly distributed on the transverse section of the calibration instrument body. The two ends of the directional structure are respectively connected to the clamping plate 9 and the fixed plate 24 on the side. The directional structure includes an directional cylinder 19 and an directional column 20 respectively connected to the clamping plate 9 and the fixed plate 24. One end of the directional column 20 is inserted into the directional cylinder 19, and the directional column 20 is slidably matched with the directional cylinder 19. The slidably matched between the directional cylinder 19 and the directional column 20 ensures the stability of the clamping plate 9 during the left and right movement adjustment process.

[0044] In summary, the mounting plate 2 can be fixedly installed on the roof of the inspection room through the cooperation between the mounting plate 2 and the mounting structure, the calibrator body 1 can be placed through the support plate 25, and the two clamps 9 can fix the calibrator body 1 in the fixing device by rotating the adjusting screw 8, thereby improving the stability of the use of the calibrator body 1, and the threaded cooperation between the bolt rod 3 and the threaded tube 4 can be used to adjust the use height of the calibrator body 1 by rotating the threaded tube 4, making the calibration more convenient and adaptable, reducing the confusion caused by placing the calibrator body 1 directly on the calibration table, reducing the clutter of the calibration environment, reducing the impact on the calibration results, reducing the calibration limitations and reducing the calibration errors.

[0045] In addition, the left and right areas of the bottom end of the support plate are fixedly connected with a placement box 10, and the front end of each placement box 10 is provided with a placement opening, through which the calibration probe and other calibration tools of the calibrator body 1 can be placed, thereby improving the protection of the calibration probe of the calibrator body 1, reducing the phenomenon of damage due to random placement, making it more convenient to use and providing a more regular detection environment.

[0046] When in use, first open four through holes in the top roof area of ​​the multimeter calibration platform according to the positions of the four mounting through holes on the mounting plate 2, then align the mounting plate 2 with the roof, use the push plate 13 to push the mounting rod 11 upwards, and after the rotating rod 16 is inserted into the through hole, release the push plate 13, and the mounting rod 11 extends downward under the elastic force of the connecting spring 12, so that the rotating rod 16 on the mounting rod 11 rotates and spreads out flat, and after the rotating rods 16 on the four mounting rods 11 are spread out flat and stable, the roof wall is clamped by the elastic force of the connecting spring 12, in cooperation with the rotating rod 16 and the mounting plate 2. If the roof wall is made of a softer material, a reinforcement structure can be selected to reinforce the roof wall according to actual conditions to ensure installation stability, and then according to the use height of the calibrator body 1, the holster 22 is used to rotate the threaded tube 4 to adjust the calibrator body 1 to a suitable use height for calibration. After the calibration is completed, the detection probe on the calibrator body 1 can be placed inside the placement box 10.

[0047] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A digital multimeter calibration device, characterized in that: It comprises a calibration instrument body (1), a mounting plate (2) located above the calibration instrument body (1), an adjustment device mounted between the mounting plate (2) and the calibration instrument body (1), and a fixing device for fixing the calibration instrument body (1); The adjusting device comprises a bolt rod (3), a threaded tube (4) and an adjusting plate (5); the bottom end of the threaded tube (4) is rotatably connected to the adjusting plate (5), the lower end of the bolt rod (3) is threadedly connected to the threaded tube (4) below, the top end of the bolt rod (3) is fixedly connected to the center of the mounting plate (2), and when the threaded tube (4) rotates, the relative position of the threaded tube (4) and the bolt rod (3) above can be changed through the thread. The fixing device comprises two fixing plates (24) located on both sides of the calibration instrument body (1) and a support plate (25) located below the calibration instrument body, the top of the fixing plate (24) is connected to the adjustment plate (5), and the bottom is connected to the support plate (25), and the calibration instrument body (1) is placed on the support plate (25); the fixing plate (24) is connected to a transverse adjustment screw (8) through a thread, and a clamping plate (9) is installed on one end of the adjustment screw (8) close to the calibration instrument body (1), and the clamping plates (9) on both sides of the calibration instrument body (1) are driven to move relative to each other by the rotation of the adjustment screw (8); The mounting plate (2) is provided with a mounting structure through a mounting shaft hole; the mounting structure comprises a mounting rod (11) and a connecting spring (12); the mounting rod (11) passes through the mounting plate (2) through the mounting through hole, and the connecting spring (12) is sleeved on a portion of the mounting rod (11) located below the mounting plate (2); the top end of the connecting spring (12) is connected to the bottom end of the mounting plate (2); the bottom end of the mounting rod (11) is laterally connected to a push plate (13); the bottom end of the connecting spring (12) is connected to the top end of the push plate (13); the push plate (13) pushes the mounting rod (11) to compress the connecting spring (12); The left and right sides of the upper end of the mounting rod (11) are respectively processed with a steering groove (14) with a semicircular cross section, a steering sleeve (15) is rotatably arranged inside the steering groove (14), and the outer side of each steering sleeve (15) is connected to a vertical rotating rod (16); The lower end of the rotating rod (16) is processed into an inclined surface (18) facing inward; The top end of the mounting rod (11) is configured as a pointed structure (17); The mounting plate (2) can be fixedly mounted on the roof of the detection room by the cooperation between the mounting plate (2) and the mounting structure, and the use height of the calibration instrument body (1) can be adjusted by rotating the threaded tube (4) through the threaded cooperation between the bolt rod (3) and the threaded tube (4).

2. A digital multimeter calibration device as claimed in claim 1, characterized in that: The adjustment device further comprises a sleeve (6) and an orientation rod (7) installed below the mounting plate (2), the orientation rod (7) being inserted into the lower inner side of the sleeve (6), and the bottom ends of the orientation rod (7) being fixedly connected to the four corners of the top end of the adjustment plate (5).

3. A digital multimeter calibration device as claimed in claim 1, characterized in that: The outside of the threaded tube (4) is provided with a leather cover (22) with anti-slip patterns.

4. A digital multimeter calibration device as claimed in claim 1, characterized in that: The outer portion of the bolt rod (3) is threaded with a fastening nut (23).

5. A digital multimeter calibration device as claimed in claim 1, characterized in that: The adjusting screw (8) is provided with a hand wheel (21).

6. A digital multimeter calibration device as claimed in claim 1, characterized in that: A transverse orientation structure is provided between the fixing plate (24) and the clamping plate (9) and is evenly distributed on the transverse cross-section of the calibration instrument body. The orientation structure comprises an orientation tube (19) and an orientation column (20) respectively connected to the clamping plate (9) and the fixing plate (24). One end of the orientation column (20) is inserted into the interior of the orientation tube (19), and the orientation column (20) and the orientation tube (19) are slidably matched.

Images