Matrix type adjustable resistance tester

Abstract

The utility model relates to the technical field of resistance testers, in particular to a matrix type adjustable resistance tester, which comprises a box body, a box cover and a matrix type adjustable resistance device, the box cover is detachably installed on the top of the box body, the matrix type adjustable resistor device is installed inside the box body and comprises a power module, a microprocessor, a measuring circuit, a matrix switch, a standard resistor and the like, a data storage interface is formed in the side wall of the box body, a plurality of heat dissipation mesh holes are formed in the side wall of the box body, and the matrix type adjustable resistor device is connected with the data storage interface. A condensation type heat dissipation mechanism is arranged at the bottom in the box cover, after the box cover is installed at the top of the box body, heat released in operation of the matrix type adjustable resistor device is absorbed through the condensation type heat dissipation mechanism, then the heat is used for evaporation heat dissipation and cold liquefaction circulation operation, and heat in the box body is continuously released. And the influence of external environment temperature is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to resistance tester technical field, concretely is matrix type adjustable resistance tester. BACKGROUND

[0002] The matrix type adjustable resistance tester is a special device for testing and calibrating resistance values, particularly suitable for application scenarios requiring high-precision resistance measurement. This tester is commonly used in electronic manufacturing, research and development laboratories, quality control, and other fields. The matrix type adjustable resistance tester includes a power module, a microprocessor / control unit, a measurement circuit, a matrix switch, a standard resistance, a temperature compensation circuit, etc.

[0003] Due to the cooperation between internal components of the matrix type adjustable resistance tester, a large amount of heat is generated during long-term operation. If this heat is not promptly removed, it can easily damage some electronic components, which is not conducive to long-term safe and stable operation. For this problem, existing matrix type adjustable resistance testers often have some ventilation holes or install cooling fans on the walls of the box to achieve some cooling effect. However, when the external environment temperature is high, the cooling effect of a simple cooling fan is insufficient.

[0004] Therefore, in view of the above problems, the present technical solution provides a matrix type adjustable resistance tester. SUMMARY

[0005] The utility model aims at providing a matrix type adjustable resistance tester to solve the problems raised in the background.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a matrix type adjustable resistance tester, including a box body 10, a box cover 11, and a matrix type adjustable resistance device 12. The box cover 11 is detachably installed on the top of the box body 10, and the matrix type adjustable resistance device 12 is installed inside the box body 10. The matrix type adjustable resistance device 12 includes a power module, a microprocessor, a measurement circuit, a matrix switch, a standard resistance, and other devices. A data storage interface is provided on the side wall of the box body 10. A plurality of heat dissipation mesh holes 15 are provided on the side wall of the box body 10 for the flow of gas inside and outside the box body 10 to improve the discharge of heat inside the box body 10. A condensing heat dissipation mechanism is provided at the bottom of the box cover 11. After the box cover 11 is installed on the top of the box body 10, the condensing heat dissipation mechanism absorbs the heat released during operation of the matrix type adjustable resistance device 12, then uses this heat for evaporation cooling, and encounters cold liquefaction cycle operation to continuously release the heat inside the box body 10, and is not affected by the external environment temperature.

[0007] Compared with the prior art, the beneficial effects of the utility model are that: through setting the condensation heat radiation mechanism in the box cover 11 inside on the basis of the existing matrix type adjustable resistance tester box body, the heat generated inside the box body 10 is released in the mode of cold and hot gas and liquid conversion, meanwhile, it is not affected by external environment temperature, and sufficient and efficient heat radiation to the inside of the box body 10 is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 It is the three-dimensional partial structure schematic diagram of matrix type adjustable resistance tester.

[0009] Figure 2 It is the three-dimensional partial structure schematic diagram of matrix type adjustable resistance tester.

[0010] Figure 3 It is the main view structure schematic diagram of box cover in matrix type adjustable resistance tester.

[0011] Figure 4 It is the distribution structure schematic diagram of condensing pipeline and heat conduction plate layer in matrix type adjustable resistance tester.

[0012] Figure 5 It is the enlarged structure schematic diagram of A in the utility model. Figure 4

[0013] It is the enlarged structure schematic diagram of B in the utility model. Figure 6 Figure 1 It is the enlarged structure schematic diagram of C in the utility model.

[0014] Figure 7 Figure 3

[0015] Wherein: box body 10, box cover 11, matrix type adjustable resistance device 12, connecting snap pin 13, connecting snap hole 14, heat radiation mesh hole 15, condensing pipeline 16, heat radiation fan 17, air vent 18, heat conduction plate layer 19, cooling medium buffer cavity 20, cooling medium evaporation pipe 21, communication end pipe 23, backflow pipe 24. DETAILED DESCRIPTION

[0016] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0017] ​​​In the description of the utility model, it is necessary to understand that the orientation or positional relation indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relation shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0018] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0019] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0020] Please refer to Figures 1-4 , matrix adjustable resistance tester, including box 10, box cover 11, matrix adjustable resistance device 12;Box cover 11 is detachably mounted on the top of box 10, and matrix adjustable resistance device 12 is installed in the inside of box 10, and matrix adjustable resistance device 12 includes power module, microprocessor, measuring circuit, matrix switch, standard resistance and the like, and at the same time, a data storage interface is arranged on the side wall of box 10, a plurality of heat dissipation mesh holes 15 are formed on the side wall of box 10, for the gas flow inside and outside box 10, so as to improve the discharge of heat in the inside of box 10, and at the same time, a condensing heat dissipation mechanism is arranged in the bottom of box cover 11, after box cover 11 is installed on the top of box 10, the heat dissipation mechanism is used to absorb the heat released by the operation of matrix adjustable resistance device 12, then the heat is used for evaporation heat dissipation, liquidification circulation operation by cooling, the heat in the inside of box 10 is continuously released, and is not affected by the external environment temperature.

[0021] In the embodiment of the present application, four groups of connecting bayonets 13 are fixedly installed at the bottom of the box cover 11, and the box body 10 is provided with connecting bayonet holes 14 corresponding to the connecting bayonets 13, the connecting bayonets 13 are connected with the connecting bayonet holes 14 through bayonet connection, so as to quickly assemble and disassemble the box cover 11 and the box body 10, and pull rings are installed on two side walls of the box cover 11, so that the pull rings are used to control the connection or separation of the box cover 11 and the box body 10;

[0022] The devices inside the matrix adjustable resistor device 12 cooperate with each other to perform resistance measurement, and the specific working principle is as follows: resistance measurement principle: the matrix adjustable resistor tester adopts four-wire measurement method (Kelvin measurement method) to eliminate the influence of lead resistance and contact resistance, calculates the resistance value by applying a known current and measuring the voltage drop generated;

[0023] Matrix structure: the matrix structure allows the tester to simultaneously connect multiple measured resistors, switches different resistors for measurement through a matrix switch, improves the test efficiency, and reduces the test time;

[0024] Automatic calibration: the tester is provided with a standard resistor for automatically calibrating the measurement circuit, so as to ensure the measurement accuracy, and the calibration process is usually automatically performed before each test, or is regularly performed according to the user setting;

[0025] Data processing: the measurement data are processed by the built-in microprocessor to calculate the accurate resistance value, and the processed data can be displayed on the display screen or exported to a computer or other equipment through an interface.

[0026] In one example of the present application, refer to Figures 1-7The condensing heat dissipation mechanism comprises a heat conduction plate layer 19 installed on the inner wall of the box cover 11, which separates the inside of the box cover 11 from the lower side. The box cover 11 is installed on the top of the box body 10. When the heat in the box body 10 flows upwards, it directly passes through the heat conduction plate layer 19 for transmission. A plurality of cooling medium evaporation pipes 21 are arranged in the heat conduction plate layer 19 in a contact manner at equal intervals on the upper side. The cooling medium evaporation pipes 21 are filled with cooling medium in a flowing manner. The cooling medium evaporation pipes 21 at the same end are commonly connected to a group of cooling medium buffer cavities 20. The cooling medium buffer cavities 20 are connected to the inclinedly distributed condensing pipelines 16 on one side at the top. The other end of the condensing pipelines 16 is commonly connected to the connecting end pipe 23. The connecting end pipe 23 is connected to the end of one group of cooling medium evaporation pipes 21 through the return pipe 24 at the bottom. The end of the condensing pipeline 16 towards the cooling medium buffer cavity 20 is higher than the end towards the connecting end pipe 23. That is, the gas evaporated in the cooling medium evaporation pipe 21 is transmitted to the condensing pipeline 16 through the cooling medium buffer cavity 20, is liquefied in the condensing pipeline 16, and then flows into the connecting end pipe 23 under the action of gravity, and then flows back to the cooling medium evaporation pipe 21 through the return pipe 24 for reuse.

[0027] It should be noted that, since the liquid in the return pipe 24 flows downwards, the gas formed in the cooling medium evaporation pipe 21 is more likely to transfer towards the cooling medium buffer cavity 20.

[0028] The content of the cooling medium in the cooling medium evaporation pipe 21 accounts for less than 2 / 3 of the volume of the cooling medium evaporation pipe 21, so that the cooling medium in the cooling medium evaporation pipe 21 can be evaporated to form gas and transfer towards the cooling medium buffer cavity 20 after being heated by the heat in the heat conduction plate layer 19.

[0029] As a preferred embodiment of the present application, a plurality of groups of air permeable holes 18 are uniformly arranged in the box cover 11 on the upper side of the condensing pipeline 16 to keep the condensing pipeline 16 in a lower temperature state. The air permeable holes 18 are provided with heat dissipation fans 17 distributed outward from the output end. The heat dissipation fans 17 are started to discharge gas outward, so that the heat in the box cover 11 and around the condensing pipeline 16 is quickly transferred outward, and a low temperature environment is provided for the condensing pipeline 16, that is, the input hot gas can be quickly liquefied.

[0030] The cooling medium is generally selected to be ethanol, acetone, toluene, etc., which have different boiling points and evaporation rates, and is used according to actual conditions.

[0031] The working principle of the utility model is: in the device idle, all the drive mentioned above, its power element, electrical components and the power supply through the wire connection, the electrical components between the working order complete electrical connection, its detailed connection means, for the art known technology, the following mainly introduces the working principle and process, not to the electrical control do the explanation, when running, matrix adjustable resistor 12 in the box 10 inside positive operation carries out each resistance test, at the same time, the heat generated by the matrix adjustable resistor 12 internal device when running is partially discharged directly to the outside through the heat dissipation mesh 15, then the rest is absorbed by the heat conduction plate layer 19, the heat entering the heat conduction plate layer 19 heats the cooling medium evaporation pipe 21 inside the cooling medium, at this time, the cooling medium is heated to form a gas, then along the cooling medium buffer cavity 20 into the different condensing pipe 16 inside, at this time, the condensing pipe 16 upper side heat dissipation fan 17 operation, keep condensing pipe 16 around low temperature, the hot gas entering the condensing pipe 16 is liquefied by cold, then under the action of gravity is transferred to the communication end pipe 23, then through the backflow pipe 24 again back to the cooling medium evaporation pipe 21, so repeatedly keep the sustained cooling treatment to the heat of the box 10 inside.

[0032] The preferred embodiments of the application are described in detail above, but the application is not limited to the above embodiments, within the knowledge of those skilled in the art, various changes can be made without departing from the spirit of the application.

Claims

1. A matrix adjustable resistance tester characterized by, Including box (10), box cover (11), matrix adjustable resistor device (12); The box cover (11) is detachably mounted on the top of the box (10), and the matrix adjustable resistor device (12) is installed in the box (10) and is internally provided with a power module, a microprocessor, a measurement circuit, a matrix switch and a standard resistor, and a data storage interface is arranged on the side wall of the box (10), a plurality of heat dissipation mesh holes (15) are formed in the side wall of the box (10), and a condensation heat dissipation mechanism is arranged in the inner bottom of the box cover (11).

2. The matrix resistance tester of claim 1, wherein, The condensation heat dissipation mechanism comprises a heat conduction plate layer (19) mounted on the inner wall of the box cover (11), the heat conduction plate layer (19) seals and separates the inside of the box cover (11) from the lower side, a plurality of cooling medium evaporation pipes (21) are arranged on the upper side of the heat conduction plate layer (19) in a contact type and at equal intervals, the cooling medium evaporation pipes (21) are internally filled with cooling medium, the cooling medium evaporation pipes (21) are commonly communicated with a group of cooling medium buffer cavities (20) at the same end, the cooling medium buffer cavities (20) are respectively communicated with the condensation pipelines (16) distributed in a slope manner at one side of the top, the condensation pipelines (16) are commonly communicated with the communication end pipes (23) at the other end, the communication end pipes (23) are respectively communicated with the end portions of one group of cooling medium evaporation pipes (21) through the backflow pipes (24) at the bottom, and the end of the condensation pipeline (16) towards the cooling medium buffer cavity (20) is higher than the end of the condensation pipeline (16) towards the communication end pipe (23).

3. The matrix resistance tester of claim 2, wherein, The content of the cooling medium in the cooling medium evaporation pipe (21) is less than 2 / 3 of the volume of the cooling medium evaporation pipe (21).

4. The matrix resistance tester of claim 3, wherein, A plurality of groups of air permeable holes (18) are uniformly arranged in the inside of the box cover (11) on the upper side of the condensation pipeline (16), and the air permeable holes (18) are internally provided with heat dissipation fans (17) distributed in an output direction.

5. The matrix resistance tester of claim 4, wherein, The cooling medium is ethanol, acetone or toluene.

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