Multi-resistance sampling resistor and test instrument

Abstract

The utility model discloses a multi-resistance sampling resistor which comprises a base, a resistor module, a pin module, a conduction module and an adjusting module, the resistor module, the pin module, the conduction module and the adjusting module are arranged on the base, and the resistor module comprises a first resistor and a second resistor which are different in resistance. According to the utility model, due to the adoption of the resistor module with a fixed resistance value, the problems of unstable resistance value and lower drift amount caused by poor contact and the like of the slide rheostat are avoided, so that the measurement precision is improved. A plurality of resistor modules with different resistance values do not need to be installed in the instrument, and a circuit structure of the test instrument does not need to be redesigned, so that the research and development and production cost can be effectively reduced. And a user can quickly switch to a required resistance value through simple module adjustment operation without replacing a resistance module or adjusting a complicated circuit, so that the operation is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic devices, in particular to a multi-resistance sampling resistor and a testing instrument. Background Art

[0002] In instrument measurement, it is often necessary to improve the test accuracy by changing the range. The solution of the prior art is to adjust the resistance value of the high-range sliding rheostat in the instrument according to the different use ranges. However, in high-precision sampling instruments, the original sliding rheostat is difficult to meet the accuracy requirements. If a resistor module with extremely low drift and fixed resistance is used for range switching, it will lead to the need to install multiple resistor modules with different resistance values ​​in the instrument, and the circuit structure in the instrument must be redesigned to achieve switching between different resistance values, resulting in increased R&D and production costs. Utility Model Content

[0003] The utility model aims to provide a multi-resistance sampling resistor and a testing instrument which has low drift and can realize multi-resistance switching.

[0004] In order to solve the above technical problems, the utility model provides a multi-resistance sampling resistor, comprising:

[0005] A base, wherein the base is made of insulating material;

[0006] A resistor module, comprising a first resistor and a second resistor installed at an interval on the base, wherein the first resistor and the second resistor have different resistance values;

[0007] A pin module, comprising a first load pin, a second load pin, a first test pin and a second test pin installed at intervals on the base;

[0008] a conduction module, comprising a plurality of lines respectively used to connect the first resistor, the second resistor, the first load pin, the second load pin, the first test pin and the second test pin; and

[0009] The regulating module is arranged on the base and is used for changing the conduction state of the conduction module so that the resistance module has a first state in which the first resistor is short-circuited and the second resistor is loaded, and a second state in which the second resistor is short-circuited and the first resistor is loaded.

[0010] Optionally, the resistance value of the first resistor is R, and the resistance value of the second resistor is greater than or equal to 10R.

[0011] Optionally, the plurality of circuits include a first circuit connected to the first load pin and the first test pin, and a second circuit connected to the second load pin and the second test pin, the first circuit connected to one end of the first resistor and having a first connection end located between the first test pin and the first resistor, the second circuit connected to one end of the second resistor and having a second connection end located between the first test pin and the first resistor, and the other ends of the first resistor and the second resistor are connected via a third circuit;

[0012] The regulating module includes a conductive member movably mounted on the base. In the first state, the conductive member connects the first connection end and the third circuit. In the second state, the conductive member connects the second connection end and the third circuit.

[0013] Optionally, the resistor module also has a third state in which the first resistor and the second resistor are connected in series and loaded at the same time. In the third state, the adjustment module is configured so that the first circuit and the third circuit, and the second circuit and the third circuit are not connected by the conductive member.

[0014] Optionally, the base has an installation side, the multiple circuits are respectively embedded in the base and at least partially exposed on the installation side, the first resistor, the second resistor, the first load pin, the second load pin, the first test pin and the second test pin are respectively stacked on a side of the multiple circuits facing the installation side, and the conductive member is stacked on a side of the multiple circuits facing the installation side.

[0015] Optionally, the third circuit has a third connection end exposed on the installation side, the first connection end, the third connection end and the second connection end are arranged in sequence in the first direction, and the conductive member is slidably installed on the base along the first direction. In the first state, the conductive member slides to one end contacting the first connection end and the other end contacting the third connection end. In the second state, the conductive member slides to one end contacting the third connection end and the other end contacting the second connection end.

[0016] Optionally, the end face of the third connection end is flush with the mounting side, and the first connection end is recessed into the base relative to the mounting side. In the first state, one end of the first test pin is clamped between the first connection end and the conductive member, and the other end extends out of the base. In the second state, one end of the second test pin is clamped between the second connection end and the conductive member, and the other end extends out of the base, and the third connection end is flush with the mounting side.

[0017] Optionally, the multi-resistance sampling resistor also includes a cover body covering the installation side of the base, the cover body is provided with a slide groove extending along the first direction, the conduction module also includes a protrusion arranged on the side of the conductive member away from the installation side, the conductive member is arranged between the installation side and the cover body, and is arranged corresponding to the slide groove, the protrusion is passed through the slide groove, and extends from the side of the cover body facing away from the base.

[0018] Optionally, the first resistor and the second resistor respectively include a resistor part and mounting parts respectively arranged at two opposite ends of the resistor part, the mounting parts are made of brass or copper, the first resistor and the second resistor are respectively embedded in the base and flush with the mounting side, and each mounting part is respectively in contact with the multiple circuits recessed in the mounting side and corresponding to the first resistor and the second resistor.

[0019] In order to solve the above technical problems, the utility model provides a testing instrument, including the multi-resistance sampling resistor as described above.

[0020] The technical solution provided by the utility model has the following advantages:

[0021] The multi-resistance sampling resistor provided by the utility model comprises a base and a resistor module, a pin module, a conduction module and an adjustment module arranged on the base, wherein the resistor module comprises a first resistor and a second resistor with different resistance values, and the multi-resistance adopting resistor provided by the utility model realizes diversified selection and switching of resistance values ​​through the cooperation of its adjustment module and the conduction module. The conduction device of the adjustment module is used to change the conduction module, so that the resistor module can switch between the first state in which the second resistor is loaded when the first resistor is short-circuited, and the second state in which the first resistor is loaded when the second resistor is short-circuited, thereby achieving the purpose of changing the resistance value. The multi-resistance sampling provided by the utility model adopts a fixed resistance adjustable resistor module, which avoids the unstable resistance value caused by the poor contact of the sliding rheostat, and the drift amount is lower, thereby improving the measurement accuracy. Since there is no need to install multiple resistor modules with different resistance values ​​in the instrument, and there is no need to redesign the circuit structure of the test instrument itself, the research and development and production costs can be effectively reduced. And the user can quickly switch to the required resistance value through a simple adjustment module operation, without replacing the resistance module or adjusting the complex circuit, and the operation is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 1 A front view of an embodiment of a multi-resistance sampling resistor provided by the utility model, wherein the resistor module is in a first state;

[0024] Figure 2 for Figure 1 Side view of a medium-value sampling resistor;

[0025] Figure 3 for Figure 1 Sectional view at AA in the middle;

[0026] Figure 4 for Figure 1 A front view of a medium-value sampling resistor, wherein the cover is not shown;

[0027] Figure 5 for Figure 1 Circuit diagram of multi-resistance sampling resistor;

[0028] Figure 6 for Figure 1 A front view of the medium multi-resistance sampling resistor, wherein the resistor module is in a second state;

[0029] Figure 7 for Figure 6 Side view of a medium-value sampling resistor;

[0030] Figure 8 for Figure 6 Sectional view at the middle BB;

[0031] Fig. 9 for Figure 6 A front view of a medium-value sampling resistor, wherein the cover is not shown;

[0032] Fig.10 for Figure 6 Circuit diagram of multi-resistance sampling resistor;

[0033] Fig.11 for Figure 1 A front view of the multi-resistance sampling resistor, wherein the resistor module is in a third state;

[0034] Fig.12 for Fig.11 Side view of a medium-value sampling resistor;

[0035] Fig.13 for Fig.11 Sectional view at CC;

[0036] Fig.14 for Fig.11 A front view of a medium-value sampling resistor, wherein the cover is not shown;

[0037] Fig.15 for Fig.11 Circuit schematic of a medium and multi-value sampling resistor.

[0038] Description of reference numerals:

[0039] 100-multi-resistance sampling resistor; 10-base; 11-installation side; 20-resistance module; 21-first resistor; 22-second resistor; 201-resistance part; 202-installation part; 31-first load pin; 32-second load pin; 33-first test pin; 34-second test pin; 41-first circuit; 411-first connection end; 42-second circuit; 421-second connection end; 43-third circuit; 431-third connection end; 50-adjustment module; 51-conductive member; 52-bump; 60-cover; 61-slide groove. DETAILED DESCRIPTION

[0040] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments. The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0042] The utility model provides a multi-resistance sampling resistor 100, please refer to Figures 1 to 15, the resistance module includes a base 10 / resistance module 20, a pin module, a conduction module and an adjustment module 50. The base 10 is made of an insulating material, such as wood or engineering plastic. The resistance module 20, the pin module, the conduction module and the adjustment module 50 are installed on the base 10. Specifically, the resistance module 20 includes a first resistor 21 and a second resistor 22 installed at intervals on the base 10, and the resistance values ​​of the first resistor 21 and the second resistor 22 are different to adapt to different measurement ranges. The pin module includes a first load pin 31, a second load pin 32, a first test pin 33 and a second test pin 34 installed at intervals on the base 10, the first load pin 31 and the second load pin 32 are connected to the power supply to realize the pressure supply to the resistance module, and the first test pin 33 and the second test pin 34 are connected to the current measuring device so that the test instrument can obtain the power flowing through the resistance module.

[0043] The conduction module includes a plurality of circuits, which are respectively used to connect the first resistor 21, the second resistor 22, the first load pin 31, the second load pin 32, the first test pin 33 and the second test pin 34. The adjustment module 50 is disposed on the base 10, and is used to change the conduction state of the conduction module to switch the resistance module 20 between different states, and to switch the range of the test instrument, thereby improving the test accuracy. For details, please refer to Figures 1 to 5 The resistor module has a first state in which the first resistor 21 is short-circuited and the second resistor 22 is loaded. Figures 6 to 10 The resistance module also has a second state in which the second resistance 22 is short-circuited and the first resistance 21 is loaded. It should be noted that being loaded means that when the resistance module is supplied with voltage from the first load pin 31 and the second load pin 32, a corresponding voltage drop is generated at both ends of the loaded resistance, and the first test pin 33 and the second test pin 34 are connected in series with the loaded resistance. This design allows the user to select different resistance values ​​as needed, thereby improving measurement accuracy.

[0044] Since the present embodiment adopts a resistor module with a fixed resistance value and an adjustable resistance value, the unstable resistance value caused by the poor contact and other problems of the sliding rheostat is avoided, and the drift amount is lower, thereby improving the measurement accuracy. Since it is not necessary to install multiple resistor modules with different resistance values ​​in the instrument, and it is not necessary to redesign the circuit structure of the test instrument itself, the research and development and production costs can be effectively reduced. In addition, the user can quickly switch to the desired resistance value by simply adjusting the module 50, without replacing the resistance module or adjusting the complex circuit, and the operation is more convenient.

[0045] On the basis of the previous embodiment, in this embodiment, the resistance value of the first resistor 21 is set to R, and the resistance value of the second resistor 22 is set to be greater than or equal to 10R. This setting of the resistance value makes the two ranges of the instrument under test have a sufficiently large difference, ensuring the accuracy requirements of the test instrument, and further enhancing the applicability of the resistor module 20, so that it can adapt to a wider measurement range and accuracy requirements.

[0046] In another embodiment, please refer to Figure 4 , Fig. 9 and Fig.14 , the plurality of lines include a first line 41, a second line 42 and a third line 43, the first line 41 is connected to the first load pin 31 and the first test pin 33, the second line 42 is connected to the second load pin 32 and the second test pin 34. The first line 41 is also connected to one end of the first resistor 21 and has a first connection end 411 located between the first test pin 33 and the first resistor 21, the second line 42 is connected to one end of the second resistor 22 and has a second connection end 421 located between the first test pin 33 and the first resistor 21, and the other end of the first resistor 21 and the second resistor 22 are connected through the third line 43.

[0047] The adjustment module 50 also includes a conductive member 51 movably mounted on the base 10. The conductive member 51 has good electrical conductivity and can be made of brass. The movable mode of the conductive member 51 relative to the base 10 is not limited. For example, it can be slidably mounted, rotated, etc. In the first state, the conductive member 51 can be driven to move to the first position connecting the first connection end 411 and the third circuit 43. In the second state, the conductive member 51 can be driven to move to the second position connecting the second connection end 421 and the third circuit 43. In this embodiment, the switching of the resistance module between the first state and the second state is realized by the movably arranged conductive member 51, and the structure is simple, reliable, and easy to implement.

[0048] On the basis of the previous embodiment, the resistor module 20 further has a third state in which the first resistor 21 and the second resistor 22 are connected in series and loaded at the same time. In this state, the first line 41 and the third line 43, and the second line 42 and the third line 43 are not connected by the conductive member 51, thereby providing an additional resistance value selection and increasing the flexibility of the resistor module 20.

[0049] For further information, please refer to Figure 3 , Figure 8 ,and Fig.11The base 10 has a mounting side 11, and the plurality of circuits are embedded in the base 10 and at least partially exposed from the mounting side 11. The first resistor 21, the second resistor 22, the first load pin 31, the second load pin 32, the first test pin 33, and the second test pin 34 are respectively stacked on the side of the plurality of circuits facing the mounting side 11, and the conductive member 51 is also stacked on the side of the plurality of circuits facing the mounting side 11. This structural design makes the resistor module 20 more compact and convenient for installation and maintenance.

[0050] For further information, please refer to Figure 4 , Fig. 9 and Fig.14 , the third circuit 43 has a third connection end 431 exposed at the mounting side 11. The first connection end 411, the third connection end 431 and the second connection end 421 are arranged in sequence in a first direction, and the conductive member 51 is slidably mounted on the base 10 along the first direction. In the first state, the conductive member 51 slides until one end contacts the first connection end 411 and the other end contacts the third connection end 431; in the second state, the conductive member 51 slides until one end contacts the third connection end 431 and the other end contacts the second connection end 421. This sliding design makes the switching operation faster and more convenient, and the structure is simple and reliable.

[0051] Preferably, the end surface of the third connection end 431 in this embodiment is flush with the mounting side 11, and the first connection end 411 is recessed relative to the mounting side 11 and the base 10. In the first state, one end of the first test pin 33 is clamped between the first connection end 411 and the conductive member 51, and the other end extends out of the base 10; in the second state, one end of the second test pin 34 is clamped between the second connection end 421 and the conductive member 51, and the other end extends out of the base 10. This design ensures the stability and reliability of the test pins, and at the same time, the overall structure of the multi-resistance sampling resistor 100 is simple and reliable, and the conduction module is basically wrapped in the base 10, which is not easily damaged and affected by the external environment.

[0052] In the preferred implementation, please continue to refer to Figures 1 to 15 The multi-resistance sampling resistor 100 further includes a cover body 60 covering the mounting side 11 of the base 10, and a slide groove 61 extending along the first direction is provided on the cover body 60. The conduction module further includes a protrusion 52 provided on the side of the conductive member 51 away from the mounting side 11, the conductive member 51 is provided between the mounting side 11 and the cover body 60, and is provided corresponding to the slide groove 61, the protrusion 52 is provided in the slide groove 61, and extends from the side of the cover body 60 facing away from the base 10. In this embodiment, the cover body 60 not only protects the components of the multi-resistance sampling resistor 100, but also limits the sliding stroke of the conductive member 51 through the cooperation of the protrusion 52 and the slide groove 61, so that the sliding position of the conductive member 51 is accurately limited, thereby ensuring the accuracy of the resistance value switching.

[0053] Optionally, the first resistor 21 and the second resistor 22 respectively include a resistor portion 201 and mounting portions 202 disposed at opposite ends of the resistor portion 201, the mounting portions 202 are made of brass or copper, the first resistor 21 and the second resistor 22 are respectively embedded in the base 10 and flush with the mounting side 11, and each mounting portion 202 is respectively in contact with the plurality of lines recessed into the mounting side 11 and correspondingly located at the first resistor 21 and the second resistor 22. In this embodiment, the structure and material selection of the first resistor 21 and the second resistor 22 increase the durability and stability of the resistor module 20, and the resistance values ​​of the first resistor 21 and the second resistor 22 are correspondingly stable.

[0054] This embodiment also provides a test instrument, which includes the multi-resistance sampling resistor 100 as described in any of the above embodiments. This test instrument can take advantage of the multi-resistance sampling resistor 100, and switch the state of the resistance module by using the multi-resistance resistor to achieve the switching of its range, thereby providing higher measurement accuracy and lower production cost, while being easy to operate.

[0055] Obviously, the above described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, ordinary technicians in this field can make other different forms of changes or modifications without creative work, which should fall within the scope of protection of the utility model.

Claims

1. A multi-resistance sampling resistor, characterized in that: include: A base, wherein the base is made of insulating material; A resistor module, comprising a first resistor and a second resistor installed at an interval on the base, wherein the first resistor and the second resistor have different resistance values; A pin module, comprising a first load pin, a second load pin, a first test pin and a second test pin installed at intervals on the base; A conduction module, comprising a plurality of lines respectively used to connect the first resistor, the second resistor, the first load pin, the second load pin, the first test pin and the second test pin; as well as, The regulating module is arranged on the base and is used for changing the conduction state of the conduction module so that the resistance module has a first state in which the first resistor is short-circuited and the second resistor is loaded, and a second state in which the second resistor is short-circuited and the first resistor is loaded.

2. The multi-resistance sampling resistor according to claim 1, characterized in that: The resistance value of the first resistor is R, and the resistance value of the second resistor is greater than or equal to 10R.

3. The multi-resistance sampling resistor according to claim 1, characterized in that: The plurality of circuits include a first circuit connected to the first load pin and the first test pin, and a second circuit connected to the second load pin and the second test pin, the first circuit connected to one end of the first resistor and having a first connection end located between the first test pin and the first resistor, the second circuit connected to one end of the second resistor and having a second connection end located between the first test pin and the first resistor, and the other ends of the first resistor and the second resistor are connected via a third circuit; The regulating module includes a conductive member movably mounted on the base. In the first state, the conductive member connects the first connection end and the third circuit. In the second state, the conductive member connects the second connection end and the third circuit.

4. The multi-resistance sampling resistor according to claim 3, characterized in that: The resistor module also has a third state in which the first resistor and the second resistor are connected in series and loaded at the same time. In the third state, the adjustment module is configured so that the first circuit and the third circuit, and the second circuit and the third circuit are not connected by the conductive member.

5. The multi-resistance sampling resistor according to claim 3 or 4, characterized in that: The base has a mounting side, the multiple circuits are respectively embedded in the base and at least partially exposed from the mounting side, the first resistor, the second resistor, the first load pin, the second load pin, the first test pin and the second test pin are respectively stacked on a side of the multiple circuits facing the mounting side, and the conductive member is stacked on a side of the multiple circuits facing the mounting side.

6. The multi-resistance sampling resistor according to claim 5, characterized in that: The third circuit has a third connection end exposed at the installation side, the first connection end, the third connection end and the second connection end are arranged in sequence in the first direction, and the conductive member is slidably installed on the base along the first direction. In the first state, the conductive member slides until one end contacts the first connection end and the other end contacts the third connection end. In the second state, the conductive member slides until one end contacts the third connection end and the other end contacts the second connection end.

7. The multi-resistance sampling resistor according to claim 6, characterized in that: The end surface of the third connection end is flush with the installation side, and the first connection end is recessed into the base relative to the installation side. In the first state, one end of the first test pin is clamped between the first connection end and the conductive member, and the other end extends out of the base. In the second state, one end of the second test pin is clamped between the second connection end and the conductive member, and the other end extends out of the base, and the third connection end is flush with the installation side.

8. The multi-resistance sampling resistor according to claim 6, characterized in that: The multi-resistance sampling resistor also includes a cover body covering the installation side of the base, the cover body is penetrated by a slide groove extending along a first direction, the conduction module also includes a protrusion arranged on a side of the conductive member away from the installation side, the conductive member is arranged between the installation side and the cover body, and is arranged corresponding to the slide groove, the protrusion is penetrated by the slide groove, and extends from a side of the cover body facing away from the base.

9. The multi-resistance sampling resistor according to claim 5, characterized in that: The first resistor and the second resistor respectively include a resistor part and mounting parts respectively arranged at two opposite ends of the resistor part, the mounting parts are made of brass or copper, the first resistor and the second resistor are respectively embedded in the base and flush with the mounting side, and each mounting part is respectively in contact with the multiple circuits recessed in the mounting side and correspondingly located at the first resistor and the second resistor.

10. A testing instrument, characterized in that: It comprises the multi-resistance sampling resistor as claimed in any one of claims 1 to 9.

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