Digital acquisition instrument

Abstract

The utility model discloses a digital acquisition instrument, and relates to the technical field of data acquisition. The digital acquisition instrument comprises a shell, a cover body, a printed circuit board and a plurality of connecting structures, the shell is provided with a first mounting cavity which is opened upwards, the printed circuit board is located between the cover body and the shell, the cover body is provided with a second mounting cavity which is opened downwards, the cover body covers the shell, the upper end face of the cover body is provided with at least one opening, and the connecting structures are arranged in the second mounting cavity. A groove communicated with the opening is formed in the upper end face of the cover body in a concave mode, and a sheet-shaped waterproof film is arranged in the groove and can cover the opening. The waterproof film arranged on the upper end face of the cover body can prevent water from permeating into the cover body, so that the upper end face, especially the opening, of the cover body is protected, and water vapor is prevented from entering the first mounting cavity through the opening to affect the printed circuit board; the waterproof film is accommodated in the groove, so that the waterproof film is not easy to damage, and the service life of the waterproof film is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of data acquisition, in particular to a digital acquisition instrument. Background Art

[0002] Digital data collectors usually use various communication technologies to exchange data with central control systems or monitoring centers, such as serial communication RS-485, Ethernet, wireless communication, etc. Digital data collectors need to be able to collect data from various sensors, instruments and other equipment and process and store them, which involves technologies such as analog and digital signal acquisition AD conversion. However, digital data collectors usually operate in harsh industrial environments, so how to ensure the safety and reliability of digital data collectors is an important issue. Utility Model Content

[0003] The main purpose of the utility model is to provide a digital collector, aiming to provide a handheld digital collector which can conveniently perform ring-shaped peeling of the epidermis of tobacco leaf stems.

[0004] To achieve the above object, the utility model provides a digital acquisition instrument, which includes:

[0005] The housing has a first mounting cavity that is open upward;

[0006] A cover body having a second installation cavity opened downward, the cover body is covered on the housing, the upper end surface of the cover body is provided with at least one opening, the upper end surface of the cover body is concavely provided with a groove communicating with the opening, a sheet-like waterproof membrane is arranged in the groove, and the sheet-like waterproof membrane can cover the opening;

[0007] a printed circuit board, located between the cover and the housing, the printed circuit board comprising a main body and a plurality of electronic components disposed on the main body; and

[0008] A plurality of connection structures are provided to detachably connect the housing to the cover or the printed circuit board.

[0009] In one embodiment, one of the opposite end surfaces of the shell and the cover is provided with an annular groove, and the other is provided with an annular boss, and the annular boss cooperates with the annular groove so that the shell and the cover are snap-fitted and connected.

[0010] In one embodiment, the upper end surface of the cover body is further provided with a plurality of through holes located around the opening for exposing at least a portion of the electronic components.

[0011] In one embodiment, one of the electronic components includes a light guide column and a signal light, one end of the light guide column is connected to the signal light, and the other end is connected to the main body of the printed circuit board, and the signal light can be exposed in one of the through holes.

[0012] In one embodiment, the digital data collector further includes a liquid crystal display screen installed at the opening.

[0013] In one embodiment, the lower wall surface of the first installation cavity is convexly provided to form a first column, and a threaded hole penetrating through the lower end surface of the shell is provided in the middle of the first column;

[0014] A second column is provided on the upper wall surface of the cover or the lower end surface of the printed circuit board corresponding to the first column, a threaded hole is provided in the middle of the second column, and the second column is tightly pressed against the first column;

[0015] The connection structure includes the first column and the second column, and the connection structure also includes a screw threaded through the first column and fastened on the second column.

[0016] In one embodiment, a plurality of slot holes are provided on the inner side wall of the first installation cavity for allowing one of the electronic components connected to the printed circuit board to pass through.

[0017] In one embodiment, the cross-sectional area of ​​one side of each of the slot holes close to the center of the shell is smaller than the cross-sectional area of ​​the other side.

[0018] In one embodiment, an antenna interface hole and two connection terminal interface holes are provided on the inner side wall of the second installation cavity; and / or,

[0019] The bottom of the shell is provided with reinforcing ribs.

[0020] In one embodiment, the lower end surface of the shell extends toward both sides of the shell to form a mounting portion, and the mounting portion is provided with a plurality of mounting holes for mounting the digital data collector to a desired installation position.

[0021] In the technical solution provided by the utility model, by arranging a waterproof film on the upper end surface of the cover body, not only can the penetration of moisture into the cover body be prevented, but also the intrusion of dust and stains on the upper end surface of the cover body can be prevented, thereby realizing the protection of the upper end surface of the cover body, especially the opening provided on the upper end surface of the cover body, under various environments. Further, it can also prevent water vapor from entering the first installation cavity through the opening and affecting the printed circuit board; by arranging the groove to accommodate the waterproof film, the waterproof film can be placed in a state that is not easily damaged, and the edge of the waterproof film can be better and more conveniently fixed or fitted with the upper end surface of the cover body, thereby preventing the waterproof film from falling off, thereby extending the life of the waterproof film. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 An exploded view of the three-dimensional structure of an embodiment of the digital acquisition device provided by the utility model;

[0024] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure of the middle cover body from one perspective;

[0025] Figure 3 for Figure 2 The structural diagram at A in the middle;

[0026] Figure 4 for Figure 1 Schematic diagram of the structure of the printed circuit board;

[0027] Figure 5 for Figure 2 A schematic structural diagram of the middle cover body from another perspective;

[0028] Figure 6 for Figure 5 The structural diagram at B in the middle;

[0029] Figure 7 for Figure 1 A schematic diagram of the three-dimensional structure of the middle shell;

[0030] Figure 8 for Figure 7 Schematic diagram of the structure at C in the middle;

[0031] Fig. 9 for Figure 7 A schematic diagram of the structure of the middle shell from another perspective.

[0032] Description of Figure Numbers:

[0033] 100. Digital data collector; 1. Shell; 11. Card slot hole; 111. Interior; 112. Exterior; 12. Reinforcement rib; 13. Mounting portion; 14. Mounting hole; 2. Cover; 21. Opening; 22. Groove; 23. Through hole; 24. Antenna interface hole; 25. Terminal interface hole; 3. Printed circuit board; 31. Main body; 32. Electronic component; 321. Signal light; 322. Control key; 323. Terminal interface; 4. Connection structure; 41. First column; 42. Second column; 51. Annular groove; 52. Annular boss.

[0034] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their 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 at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0038] Digital data collectors usually use various communication technologies to exchange data with central control systems or monitoring centers, such as serial communication RS-485, Ethernet, wireless communication, etc. Digital data collectors need to be able to collect data from various sensors, instruments and other equipment and process and store them, which involves technologies such as analog and digital signal acquisition AD conversion. However, digital data collectors usually operate in harsh industrial environments, so how to ensure the safety and reliability of digital data collectors is an important issue.

[0039] In order to solve the technical problem, the utility model provides a digital acquisition instrument which can be arranged and work in a harsh industrial environment.

[0040] See also Figures 1 to 3The digital acquisition instrument 100 includes a shell 1, a cover 2, a printed circuit board 3 and a plurality of connection structures 4. The shell 1 has a first installation cavity open upward; the cover 2 has a second installation cavity open downward, the cover 2 covers the shell 1, the upper end surface of the cover 2 is provided with at least one opening 21, the upper end surface of the cover 2 is concavely provided with a groove 22 connected to the opening 21, a sheet-like waterproof membrane is arranged in the groove 22, and the sheet-like waterproof membrane can cover the opening 21; the printed circuit board 3 is located between the cover 2 and the shell 1, and the printed circuit board 3 includes a main body 31 and a plurality of electronic components 32 arranged on the main body 31; the plurality of connection structures 4 are used to detachably connect the shell 1 with the cover 2 or the printed circuit board 3.

[0041] In the technical solution provided by the utility model, by arranging a waterproof film on the upper end surface of the cover body 2, it is possible to prevent not only the penetration of moisture into the cover body 2, but also the intrusion of dust and stains on the upper end surface of the cover body 2, thereby realizing the protection of the upper end surface of the cover body 2, especially the opening 21 provided on the upper end surface of the cover body 2, under various environments. Furthermore, it is also possible to prevent water vapor from entering the first installation cavity through the opening 21 to affect the printed circuit board 3.

[0042] If the waterproof membrane is directly attached to the upper end surface of the cover body 2, the waterproof membrane will protrude from the upper end surface of the cover body 2. After a period of time or in a harsh environment, it will be easily damaged, causing its function to be weakened or falling off. By providing the groove 22 to accommodate the waterproof membrane, the waterproof membrane can be placed in a state that is not easily damaged, and the edge of the waterproof membrane can be better and more conveniently fixed or fitted to the upper end surface of the cover body 2, preventing the waterproof membrane from falling off, thereby extending the life of the waterproof membrane.

[0043] It should be noted that the waterproof film is not limited to a film with a waterproof function, but can also be a film with a dustproof function, or a film that can resist acid, alkali and other corrosive environments under certain special conditions, etc. The above films all belong to the category of the waterproof film of this application. In some embodiments, the waterproof film can adopt a PEI (polyetherimide) waterproof film. PEI is not only water-resistant and moisture-proof, but also has excellent chemical resistance. It can resist the erosion of a variety of chemical substances, including some strong acids, strong alkalis and organic solvents. PEI material has good heat resistance, wear resistance and high strength, can withstand certain mechanical stress and wear, and can maintain stable performance in high temperature environments. In addition, the depth of the groove 22 can be 0.4mm~0.6mm.

[0044] Furthermore, the upper end surface of the cover body 2 is also provided with a plurality of through holes 23 located around the opening 21, for exposing at least part of the electronic components 32. The printed circuit board 3 has electronic components 32 that need to be exposed from the housing 1, so the upper end surface of the cover body 2 is provided with a plurality of through holes 23 located around the opening 21 to expose the above-mentioned electronic components 32, such as indicator lights and control buttons. In some other embodiments, the through holes 23 can also be provided on the circumference of the cover body 2 or the housing 1, but such a setting cannot provide good protection for the above-mentioned opening 21. Therefore, the plurality of through holes 23 are provided on the upper end surface of the cover body 2, and the waterproof film covering the upper end surface of the cover body 2 can provide good protection for these components exposed from the cover body 2.

[0045] In some embodiments, see Figure 4 , wherein one of the electronic components 32 includes a light guide column and a signal light 321, one end of the light guide column is connected to the signal light 321, and the other end is connected to the main body 31 of the printed circuit board 3, and the signal light 321 can be exposed in one of the through holes 23. The light guide column is made of optical materials, such as acrylic resin, polycarbonate, epoxy resin and glass. The light is transmitted from the printed circuit board 3 to the signal light 321 with minimal loss through the light guide column, which can provide obvious light prompts for the status of the device. Therefore, the light needs to be exposed on the outside 112 of the digital collector 100. Therefore, the through hole 23 provided on the upper end surface of the cover body 2 allows the signal light 321 to be exposed from the cover body 2. Because the upper end surface of the cover body 2 is provided with the waterproof film, the signal light 321 can be well protected.

[0046] It should be noted that the through hole 23 is not only used to expose the signal light 321, but also can be used to expose other components connected to the printed circuit board 3, such as the control key 322, or the alarm, etc., and the present invention does not limit this. In one embodiment of the present invention, the plurality of through holes 23 are arranged on both sides of the opening 21, one side has three through holes 23 to expose the three signal lights 321, and the other side has five through holes 23 to expose the five control keys 322.

[0047] For further information, see Figures 5 to 8, one of the opposite end faces of the shell 1 and the cover body 2 is provided with an annular groove 51, and the other is provided with an annular boss 52, and the annular boss 52 cooperates with the annular groove 51 so that the shell 1 and the cover body 2 are snap-fitted and connected. Through the snap-fitting of the annular boss 52 and the annular groove, the shell 1 and the cover body 2 can be limited, so that when the shell 1 and the cover body 2 are connected through the connecting structure 4, they can be pre-positioned, which is convenient for the connection of the connecting structure 4. It should be noted that the annular groove 51 and the annular boss 52 can be arranged in the middle of the end faces of the cover body 2 and the shell 1, or at the edge of the end faces, and the utility model does not limit this. When the annular groove 51 and the annular boss 52 are arranged at the edge of the end faces of the cover body 2 and the shell 1, since the boss and the groove 22 of the shell 1 and the cover body 2 have only one annular mounting side, it is more convenient and easy to operate when snapping.

[0048] The digital collector 100 also includes a liquid crystal display (LCD screen) installed at the opening 21. The LCD screen (not shown in the figure) is electrically connected to the printed circuit board 3. A customized LCD screen can be selected so that the screen can clearly display data even in a strong light environment outdoors, which can greatly improve the viewing experience.

[0049] In some embodiments of the present application, in the selection of the electronic component 32:

[0050] The max485 chip can be used as the RS485 communication signal transceiver. By using the TVS tube, the error probability can be reduced and the accuracy of the received data can be improved.

[0051] Imported ST series chips can also be used, and up to 128KB of flash ensures that the program runs smoothly and in real time.

[0052] At the same time, it can be built-in with a large-capacity 16MB Flash, which can save system data for more than one month. In addition to the built-in Flash, we have also thoughtfully designed an SD card interface for users. If you feel that the built-in capacity cannot meet the requirements, you can use an external TF card with a maximum capacity of 1GB to store or export data.

[0053] Furthermore, optical coupler isolation can be used to receive the signal quantity, which effectively protects the safety of the equipment. Even if the worker connects the sensor interface incorrectly during wiring, the equipment can be guaranteed not to be damaged. The optical coupler isolation module converts the external 112 electrical signal into an internal 111 electrical signal through an optical signal, ensuring that the electrical connection inside and outside the equipment is not conductive, and avoiding the equipment from being broken down due to strong electricity, lightning, and lightning.

[0054] In the design of the power interface, a redundant protection design of MOS tube anti-reverse connection and adding fuses and TVS tubes can be used. While saving energy (diode anti-reverse connection will increase power consumption), it can not only prevent the power supply from being connected in reverse (MOS tube anti-reverse connection), but also ensure that the power supply short circuit caused by accidental touch will not burn the equipment (short circuit of the positive and negative poles of the battery will cause excessive current to burn the equipment. After adding the fuse, the current is automatically disconnected due to excessive current to protect the equipment).

[0055] In addition, the device has low power supply requirements, so no dedicated adapter is required (12V and above are acceptable), and a wide range of voltage power supply (12-36V) can be used to ensure normal operation of the device regardless of whether a large lead-acid battery or a lithium battery is used.

[0056] When configuring device parameters, you can not only use the device control key 322 to configure, but also take out your mobile phone and use the device's accompanying mini program to configure the device information with one click, which is simple, convenient and fast.

[0057] For further information, see Figures 5 to 8 , the lower wall of the first installation cavity is convexly provided with a first column 41, and the middle part of the first column 41 is provided with a threaded hole penetrating the lower end face of the housing 1; the upper wall of the cover 2 or the lower end face of the printed circuit board 3 is provided with a second column 42 (the second column 42 provided on the lower end face of the printed circuit board 3 is not shown) corresponding to the first column 41, and the middle part of the second column 42 is provided with a threaded hole, and the second column 42 is tightly pressed against the first column 41; the connecting structure 4 includes the first column 41 and the second column 42, and the connecting structure 4 also includes a screw for threading through the first column 41 and fastening on the second column 42. By screwing the screw into the threaded holes of the first column 41 and the second column 42, the technical effect of compact structure and firm installation is achieved. In some other embodiments, bolts can also be passed through the holes on the housing 1 and the cover 2 to lock with nuts for assembly, but this method not only requires more spare parts, but also the degree of fastening after assembly is not easy to grasp, and the nut and stud parts will be exposed outside the housing 1, and the risk of rust is higher. Therefore, screwing screws into the threaded holes of the first column 41 and the second column 42 not only has the technical effect of compact structure and firm installation, but also can reduce the risk of screw rust. Furthermore, a reinforcing plate can be connected between the first column 41 and the side wall of the housing 1, and a reinforcing plate can also be connected between the second column 42 arranged on the upper wall of the cover 2 and the side wall of the cover 2, thereby increasing the support force of the connecting structure 4 in the horizontal direction.

[0058] In addition, a plurality of card slot holes 11 are provided on the inner side wall of the first installation cavity for passing one of the electronic components 32 connected to the printed circuit board 3. Specifically, since a TF card slot and a SIM card slot may be provided on the PCB board, a TF card slot hole 11 and a SIM card slot hole 11 may be provided on the digital acquisition instrument 100 to accommodate the TF card slot and the SIM card slot connected to the PCB board body 31.

[0059] Since function cards such as TF cards and SIM cards may need to be plugged in and out more frequently, in some embodiments of the present application, the cross-sectional area of ​​the side of each of the card slot holes 11 close to the center of the housing 1 is smaller than the cross-sectional area of ​​the other side. That is, a chamfer is set at the card slot hole 11. In one embodiment, please refer to the figure, the card slot hole 11 can be divided into an inner 111 and an outer 112 along the direction from the center of the housing 1 to the outer 112 of the housing 1, and the cross-sectional area of ​​the inner 111 hole remains unchanged to limit the card slots connected to the printed circuit board 3, and the cross-sectional area of ​​the outer 112 hole gradually increases along the direction from the center of the housing 1 to the outer 112 of the housing 1, that is, the outer 112 hole gradually expands from the inside to the outside, providing space for the insertion of each corresponding card, making plugging and unplugging more convenient. In some other embodiments, the entire card slot hole 11 can also be set to have a cross-sectional area that gradually increases along the direction from the center of the housing 1 to the outer 112 of the housing 1, but such a setting is not convenient for limiting the card slots connected to the printed circuit board 3, and the card slot has a larger activity space in the card slot hole 11.

[0060] Furthermore, in order to realize the connection between the digital acquisition instrument 100 and the external circuit 112, when the PCB board is provided with an antenna interface and a corresponding number and width of terminal interfaces, an antenna interface hole 24 and a terminal interface hole 25 can be correspondingly provided on the inner side wall of the second installation cavity. In one embodiment, an antenna interface and two terminal interfaces are provided on the inner side wall of the second installation cavity to realize the connection between the digital acquisition instrument 100 and the external circuit 112.

[0061] See also Fig. 9 In one embodiment, the bottom of the shell 1 is provided with reinforcing ribs 12. The reinforcing ribs 12 can optimize the stress distribution of the shell 1, dispersing the high stress area that may be concentrated in a local area to a wider area, thereby reducing the risk of material failure. In addition, it can also increase the moment of inertia of the shell 1, improve the ability to resist bending deformation, and ensure that the shell 1 can still maintain its original shape and dimensional accuracy when subjected to external forces. Therefore, providing the reinforcing ribs 12 at the bottom of the shell 1 can effectively improve the strength and rigidity of the shell 1.

[0062] The lower end of the housing 1 extends toward both sides of the housing 1 to form a mounting portion 13, and a plurality of mounting holes 14 are provided on the mounting portion 13 for mounting the digital acquisition instrument 100 to a desired location. The mounting holes 14 can be threaded holes, and the housing 1 is fixed to the object to be installed by screws, or they can be ordinary holes, and the object to be installed is fixed by a cable tie.

[0063] In addition, arc chamfers are provided at the corners of the housing 1, the cover 2 and the printed circuit board 3. The arc chamfers can remove the sharp edges of the housing 1 caused by processing or design, which not only improves the safety of the housing 1 and prevents scratches or cuts caused by sharp edges, but also avoids stress concentration, which helps to extend the service life of the housing 1. The arc chamfers play a guiding role in the assembly process, making the assembly of the housing 1 and other components smoother, reducing the difficulty and cost of assembly. At the same time, it can also ensure that the appearance of the assembled product is more neat and beautiful, and improve the overall texture of the product.

[0064] In some embodiments, the housing 1 and the cover 2 may be manufactured using an ABS injection molding process, in which case the arc chamfer helps release stress and prevents the housing 1 from cracking or deforming due to stress concentration, thereby improving the stability and reliability of the product.

[0065] In the technical solution provided by the utility model, during assembly, the printed circuit board 3 is first installed on the housing 1 through multiple connection structures 4, and the components on the printed circuit board 3 are adjusted to be in respective positions corresponding to the housing 1 or the cover 2, and then the annular grooves 51 and annular bosses 52 respectively arranged on the opposite end surfaces of the housing 1 and the cover 2 are buckled, at which time the first column 41 and the second column 42 are pressed tightly, and the screws are screwed into the threaded holes on the lower end surface of the housing 1 until the first column 41 and the second column 42 are fastened, thereby obtaining the digital acquisition instrument 100.

[0066] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A digital data acquisition instrument, characterized in that: The digital acquisition instrument comprises: The housing has a first mounting cavity that is open upward; A cover body having a second installation cavity opened downward, the cover body is covered on the housing, the upper end surface of the cover body is provided with at least one opening, the upper end surface of the cover body is concavely provided with a groove communicating with the opening, a sheet-like waterproof membrane is arranged in the groove, and the sheet-like waterproof membrane can cover the opening; a printed circuit board, located between the cover and the housing, the printed circuit board comprising a main body and a plurality of electronic components disposed on the main body; and A plurality of connection structures are provided to detachably connect the housing to the cover or the printed circuit board.

2. The digital acquisition instrument according to claim 1, characterized in that: One of the opposite end faces of the shell and the cover is provided with an annular groove, and the other is provided with an annular boss, and the annular boss cooperates with the annular groove so that the shell and the cover are snap-fitted and connected.

3. The digital acquisition instrument according to claim 1, characterized in that: The upper end surface of the cover body is also provided with a plurality of through holes located around the opening for exposing at least a portion of the electronic components.

4. The digital acquisition instrument as claimed in claim 3, characterized in that: One of the electronic components includes a light guide column and a signal light, one end of the light guide column is connected to the signal light, and the other end is connected to the main body of the printed circuit board, and the signal light can be exposed in one of the through holes.

5. The digital acquisition instrument according to claim 1, characterized in that: The digital acquisition instrument also includes a liquid crystal display screen installed at the opening.

6. The digital acquisition instrument as claimed in claim 1, characterized in that: The lower wall surface of the first installation cavity is convexly provided to form a first column, and the middle part of the first column is provided with a threaded hole penetrating through the lower end surface of the shell; A second column is provided on the upper wall surface of the cover or the lower end surface of the printed circuit board corresponding to the first column, a threaded hole is provided in the middle of the second column, and the second column is tightly pressed against the first column; The connection structure includes the first column and the second column, and the connection structure also includes a screw threaded through the first column and fastened on the second column.

7. The digital acquisition instrument according to claim 1, characterized in that: A plurality of slot holes are arranged on the inner side wall of the first installation cavity for one of the electronic components connected to the printed circuit board to pass through.

8. The digital acquisition instrument as claimed in claim 7, characterized in that: The cross-sectional area of ​​one side of each of the slot holes close to the center of the shell is smaller than the cross-sectional area of ​​the other side.

9. The digital acquisition instrument according to claim 1, characterized in that: An antenna interface hole and two connection terminal interface holes are provided on the inner side wall of the second installation cavity; and / or, The bottom of the shell is provided with reinforcing ribs.

10. The digital acquisition instrument according to claim 1, characterized in that: The lower end surface of the shell extends toward both sides of the shell to form a mounting portion, and the mounting portion is provided with a plurality of mounting holes for mounting the digital acquisition instrument to a desired installation position.

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