A signal transfer fixture box and resistance measuring instrument

Abstract

The utility model belongs to the field of resistance measurement technology, and discloses a signal transfer fixture box and a resistance measuring instrument. A signal transfer fixture box includes a box body, a plurality of connectors, leads, a plurality of fixtures and a shielding member. The plurality of connectors are connected to the box body, and one end of the same side of the plurality of connectors is arranged outside the box body for connecting to a resistance measuring instrument, and the other end of the same side is arranged inside the box body; one end of the lead is connected to one end of the connector located inside the box body, and one lead is correspondingly connected to one connector; the fixture includes a transmission end and a clamping end, and one end of the lead away from the connector is connected to the transmission end; the shielding member is connected to the connector. In this way, the box body can accommodate the leads and support the connector, and under the action of the shielding member, the interference of the external signal to the connector and the distributed capacitance effect interference between the connectors can be reduced, thereby improving the measurement accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field of resistance measurement, in particular to a signal transfer fixture box and a resistance measuring instrument. Background Art

[0002] During the manufacturing and assembly process of civil aircraft, electrical bonding between metal and metal, or metal and composite materials will be performed. The quality of the electrical bonding will affect the performance and safety of the aircraft. The resistance value of the bonding surface is one of the important indicators for judging the quality of the electrical bonding.

[0003] When measuring the resistance value of the overlapping surface, the four-wire resistance measurement technology is often used. The four-wire resistance measurement technology requires a pair of Kelvin fixtures to clamp the test piece. One Kelvin fixture is connected to two leads, and the end of the lead facing away from the Kelvin fixture is connected to a connector. The connector is plugged into the interface on the resistance measuring instrument to transmit the signal received by the Kelvin fixture to the resistance measuring instrument.

[0004] However, since the connector is easily interfered by external signals when it is plugged into the resistance meter, and in order to ensure the compactness and portability of the resistance meter, the spacing between the four interfaces is usually set to be smaller. When the four connectors are correspondingly plugged into the interfaces, the distance between the connectors is too close, which may cause a distributed capacitance effect on the leads, thereby affecting the measurement signal and further affecting the resistance measurement accuracy. Utility Model Content

[0005] The utility model aims to provide a signal transfer fixture and a resistance measuring instrument to solve the problem that the measurement accuracy of the resistance measuring instrument is easily disturbed by external signals and distributed capacitance effects.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] In one aspect, a signal transfer fixture box includes:

[0008] Box body;

[0009] A plurality of plug connectors, wherein the plurality of plug connectors are connected to the box body, one end of the plurality of plug connectors on the same side is arranged outside the box body for connecting to a resistance measuring instrument, and the other end of the plurality of plug connectors on the same side is arranged inside the box body;

[0010] A lead wire, one end of which is connected to one end of the connector located inside the box body, and one lead wire is correspondingly connected to one connector;

[0011] A plurality of clamps, each of which comprises a transmission end and a clamping end, and an end of the lead wire facing away from the connector is connected to the transmission end;

[0012] A shielding member is connected to the connector and is used for shielding external signals.

[0013] Preferably, the box body has an opening, and all the leads pass through the opening.

[0014] Preferably, the shielding member is a shielding layer, the potential of the shielding layer is the same as that of the connector, and the shielding layer is sleeved on one end of the connector located outside the box body and is coaxially arranged with the connector.

[0015] Preferably, the signal transfer fixture box further comprises a protective layer, wherein the protective layer is sleeved on the shielding layer and is coaxially arranged with the shielding layer.

[0016] Preferably, the shielding layer is made of copper braided wire; and / or the protective layer is made of plastic material.

[0017] Preferably, the length of the protective layer, the length of the shielding layer, and the length of the connector extending out of one end of the box body increase successively, and one end of the protective layer facing the box body is flush with one end of the shielding layer facing the box body.

[0018] Preferably, the signal transfer fixture box further comprises an insulating layer, wherein two insulating layers are provided, and the two insulating layers are respectively provided between the connector and the shielding layer, and between the shielding layer and the protective layer.

[0019] Preferably, the insulating layer is made of rubber material.

[0020] Preferably, the length of the insulating layer between the connector and the shielding layer is greater than or equal to the length of the shielding layer, and the length of the insulating layer between the shielding layer and the protective layer is greater than or equal to the length of the protective layer.

[0021] On the other hand, a resistance measuring instrument comprises a measuring instrument body and the signal transfer fixture box as described above, wherein the measuring instrument body is provided with interfaces whose number corresponds to the number of the connecting plugs, and the connecting plugs can be selectively plugged into the interfaces.

[0022] Beneficial effects of the utility model:

[0023] A signal transfer fixture box comprises: a box body; a plurality of connectors, wherein the plurality of connectors are connected to the box body, one end of the plurality of connectors on the same side is arranged outside the box body for connecting to a resistance measuring instrument, and the other end on the same side is arranged inside the box body; a lead wire, wherein one end of the lead wire is connected to one end of the connector plug located inside the box body, and one lead wire is correspondingly connected to one connector plug; a plurality of clamps, wherein the clamps comprise a transmission end and a clamping end, and one end of the lead wire facing away from the connector plug is connected to the transmission end; and a shielding member, wherein the shielding member is connected to the connector plug and is used to shield external signals.

[0024] In this way, the connector is arranged on the box body, so that the box body can accommodate the lead wires while providing stable support for the connector, thereby improving the stability during the measurement process, and the box body can block part of the external signals to avoid the interference of the external signals on the lead wires and the connector. The shielding member can shield the external signals, and since each connector is connected to the shielding member, even if the spacing between the connectors is small, the generation of the distributed capacitance effect can be reduced, thereby avoiding the effect of the connector transmitting the test signal from being reduced due to the interference of the external signals and the distributed capacitance effect, thereby improving the accuracy of the resistance measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a partial structural schematic diagram of a signal transfer fixture box in one embodiment of the utility model;

[0026] Figure 2 It is a structural schematic diagram of a signal transfer fixture box in one embodiment of the utility model;

[0027] Figure 3 It is a side view of the signal transfer fixture box in one embodiment of the utility model, which is intended to show the opening.

[0028] In the figure:

[0029] 1. Box body; 11. Opening; 2. Connector plug; 3. Lead wire; 4. Clamp; 41. Transmission end; 42. Clamping end; 5. Shielding element; 6. Protective layer; 7. Insulation layer. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] See also Figure 1 and Figure 2 The utility model provides a signal transfer fixture box, including a box body 1, a plurality of connectors 2, leads 3, a plurality of fixtures 4 and a shielding member 5, wherein the plurality of connectors 2 are connected to the box body 1, one end of the plurality of connectors 2 on the same side is arranged outside the box body 1 for connecting to a resistance measuring instrument, and the other end of the plurality of connectors 2 on the same side is arranged inside the box body 1; one end of the lead 3 is connected to one end of the connector 2 located inside the box body 1, and one lead 3 is correspondingly connected to one connector 2; the fixture 4 includes a transmission end 41 and a clamping end 42, and one end of the lead 3 away from the connector 2 is connected to the transmission end 41; the shielding member 5 is connected to the connector 2 for shielding external signals.

[0035] In this embodiment, taking the four-wire method as an example, the outer surface of the plug 2 is gold-plated, four plugs 2 are provided, and two clamps 4 are provided. Each clamp 4 includes two transmission ends 41 and two clamping ends 42, and each transmission end 41 is connected to a lead 3; the box body 1 is a rectangular structure with a hollow interior, and the plug 2 passes through the box body 1 and is fixedly connected to the box body 1; each plug 2 is connected to a shielding member 5.

[0036] It should be noted that the four leads 3 are respectively a high potential excitation line, a low potential excitation line, a high potential detection line, and a low potential detection line. The four connectors 2 are arranged side by side at equal intervals along the length direction of the box body 1. One of the two transmission ends 41 on one fixture 4 is connected to the high potential excitation line, and the other is connected to the high potential detection line. One of the two transmission ends 41 of another fixture 4 is connected to the low potential excitation line, and the other is connected to the low potential detection line. When measuring resistance, the four connectors 2 are correspondingly inserted into the four interfaces, and the fixture 4 is clamped at both ends of the device to be tested. The high potential excitation signal and the low potential excitation signal are respectively output to the high potential excitation line and the low potential excitation line through the corresponding interfaces. After the electrical signal is transmitted to the device to be tested through the fixture 4, it is transmitted to the corresponding connector 2 through the high potential detection line and the low potential detection line. The resistance measuring instrument obtains the resistance value of the device to be tested by analyzing the electrical signal transmitted by the corresponding connector 2.

[0037] In this way, the box body 1 can accommodate part of the lead wires 3 and support the plug 2, which is convenient for the staff to directly hold the box body 1 so that the plug 2 can be stably plugged into the interface on the resistance measuring instrument, and reduce the interference of external signals on the lead wires 3 and the plug 2, thereby improving the measurement accuracy; the shielding member 5 can shield external signals, avoid interference with the plug 2 and thus affect the measurement accuracy, and because each plug 2 is connected to the shielding member 5, the distributed capacitance effect between the plugs 2 can be reduced without increasing the spacing between the plugs 2, thereby improving the measurement accuracy.

[0038] It is understandable that the specifications and types of the plug 2 and the clamp 4 can be adjusted according to actual needs, and no further examples are given here. In this embodiment, the clamp 4 is a Kelvin clamp.

[0039] See also Figure 2 and Figure 3 In some embodiments, the box body 1 is provided with an opening 11, and all the leads 3 pass through the opening 11. The opening 11 is provided at one end surface of the box body 1.

[0040] In this way, the leads 3 all pass through the openings 11, which can limit the positions of the leads 3 and the fixture 4 outside the box body 1, so that when the fixture 4 measures the object to be tested, the leads 3 and the fixture 4 are not easily displaced, thereby causing inaccurate measurement results.

[0041] It is understandable that the opening 11 can also be set on the top surface, bottom surface or side wall of the box body 1, and four openings 11 can also be set so that the four leads 3 pass through the corresponding openings 11 respectively and are connected to the clamp 4. The position and number of the openings 11 can be adjusted according to actual needs, as long as the leads 3 can pass through the box body 1. No more examples are given here.

[0042] See also Figure 1 In some embodiments, the shielding member 5 is a shielding layer, the potential of the shielding layer is the same as the potential of the plug connector 2, that is, the potential difference between the shielding layer and the plug connector 2 is zero, and the shielding layer is sleeved on one end of the plug connector 2 located outside the box body 1 and is coaxially arranged with the plug connector 2. Further, the shielding layer is made of copper braided wire.

[0043] In this way, the shielding layer can reflect or absorb external electrical signals to prevent the electrical signals from penetrating the shielding layer and interfering with the docking plug 2. Since the shielding layer has the same potential as the docking plug 2, it can shield external electromagnetic signals, reduce the generation of distributed capacitance effects, and increase measurement accuracy.

[0044] It can be understood that the shielding member 5 can also be a sleeve made of copper material (not shown in the figure), the sleeve is coaxially sleeved on the plug 2, and one end of the sleeve is fixedly connected to the box body 1, or it can be a baffle arranged between the plugs 2. The specific structure of the shielding member 5 can be adjusted according to actual needs, and it can achieve isolation of external signals and reduction of distributed capacitance effects. No more examples are given here.

[0045] See also Figure 1 In some embodiments, the signal transfer fixture box further includes a protective layer 6, which is sleeved on the shielding layer and coaxially arranged with the shielding layer. Further, the protective layer 6 is made of plastic material, and the protective layer 6 is grounded or floating.

[0046] In this way, the protective layer 6 made of plastic material can not only further shield external signals and reduce external signal interference on the plug 2, but also protect the shielding layer and the plug 2 so that they are not easily physically damaged. Since plastic is an insulating material, it can prevent the shielding layer from being accidentally grounded or short-circuited, thereby ensuring the stability of the shielding effect and further improving the stability and accuracy of the measurement.

[0047] It is understandable that the protective layer 6 can also be made of other insulating materials, such as mica, rubber, etc. The material of the protective layer 6 can be adjusted according to actual needs and will not be listed in detail here.

[0048] See also Figure 1In some embodiments, the length of the protective layer 6, the length of the shielding layer, and the length of the end of the connector 2 extending from the box body 1 are increased in sequence, and the end of the protective layer 6 facing the box body 1 is flush with the end of the shielding layer facing the box body 1. That is, part of the shielding layer and part of the connector 2 are exposed to the outside.

[0049] In this way, one end of the connector 2 connected to the interface is exposed, which can ensure stable and efficient transmission of electrical signals between the connector 2 and the interface, and prevent the shielding layer and the protective layer 6 from affecting the transmission of the measurement signal while shielding external signals, thereby affecting the measurement accuracy.

[0050] It is understandable that the length of the protective layer 6 , the length of the shielding layer, and the length of the connector 2 can all be adjusted according to actual parameters as long as they can be compatible with the interface of the resistance measuring instrument.

[0051] See also Figure 1 In some embodiments, the signal transfer fixture box further includes an insulating layer 7, wherein two insulating layers 7 are provided, and the two insulating layers 7 are respectively provided between the connector 2 and the shielding layer, and between the shielding layer and the protective layer 6. Furthermore, the insulating layer 7 is made of rubber material.

[0052] In this way, the insulating layer 7 can further enhance the insulation performance between the plug 2 and the outside world, prevent current conduction, prevent the plug 2 from being interfered by external signals and distributed capacitance effects, and absorb part of the mechanical stress when the plug 2 is plugged into the interface, thereby protecting the shielding layer and the plug 2, extending the service life of the plug 2, and improving the mechanical properties of the plug 2.

[0053] It is understandable that the insulating layer 7 may also be made of other insulating materials, such as resin, mica, etc., which are not listed in detail here.

[0054] See also Figure 1 In some embodiments, the length of the insulating layer 7 between the connector 2 and the shielding layer is greater than or equal to the length of the shielding layer, and the length of the insulating layer 7 between the shielding layer and the protective layer 6 is greater than or equal to the length of the protective layer 6. In this embodiment, the length of the insulating layer 7 between the connector 2 and the shielding layer is greater than the length of the shielding layer, and the length of the insulating layer 7 between the shielding layer and the protective layer 6 is greater than the length of the protective layer 6, that is, the outer surfaces of the ends of the two insulating layers 7 facing away from the box body 1 are exposed to the outside.

[0055] In this way, the contact portion between the shielding layer and the connector 2, and the contact portion between the protective layer 6 and the shielding layer are all covered by the insulating layer 7, which can enhance the insulation performance of the connector 2, prevent external electromagnetic wave signals from contacting the connector 2 and affecting the signal transmission of the connector 2, and improve the accuracy of resistance measurement.

[0056] It is understandable that the length of the insulating layer 7 can be flexibly adjusted according to the length of the connector 2 , the length of the shielding layer and the length of the protective layer 6 , and it only needs to cover the inner wall of the shielding layer and the inner wall of the protective layer 6 .

[0057] The utility model provides a resistance measuring instrument, comprising a measuring instrument body (not shown in the figure) and a signal transfer fixture box. The measuring instrument body is provided with interfaces corresponding to the number of connecting plugs 2, and the connecting plugs 2 can be selectively plugged with the interfaces.

[0058] In this way, the connectors 2 are respectively inserted into the corresponding interfaces, and the clamping ends 42 of the fixture 4 are respectively connected to the two ends of the device to be tested, and the resistance measuring instrument is started so that the high potential excitation signal and the low potential excitation signal are transmitted to the device to be tested through the clamping ends 42 of the fixture 4, and the electrical signal output by the device to be tested is transmitted to the resistance measuring instrument through the lead 3 for analysis, so as to measure the resistance value of the device to be tested. Since the shielding layer, the insulating layer 7 and the protective layer 6 can shield external interference signals and reduce the distributed capacitance effect between the connectors 2, the measurement result can be more accurate after eliminating the interference.

[0059] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A signal transfer fixture box, characterized in that: include: Box body (1); A plurality of connectors (2), wherein the plurality of connectors (2) are connected to the box body (1), one end of the plurality of connectors (2) on the same side is arranged outside the box body (1) for connecting to a resistance measuring instrument, and the other end of the plurality of connectors (2) on the same side is arranged inside the box body (1); A lead wire (3), one end of the lead wire (3) being connected to one end of the connector (2) located inside the box body (1), and one lead wire (3) is correspondingly connected to one connector (2); A plurality of clamps (4), each of the clamps (4) comprising a transmission end (41) and a clamping end (42), and an end of the lead wire (3) facing away from the connector (2) is connected to the transmission end (41); A shielding member (5), the shielding member (5) is connected to the connector (2) and is used to shield external signals.

2. The signal transfer fixture box according to claim 1, characterized in that: The box body (1) is provided with an opening (11), and all the leads (3) pass through the opening (11).

3. The signal transfer fixture box according to claim 1, characterized in that: The shielding member (5) is a shielding layer, the potential of the shielding layer is the same as the potential of the connector (2), and the shielding layer is sleeved on one end of the connector (2) located outside the box body (1) and is coaxially arranged with the connector (2).

4. The signal transfer fixture box according to claim 3, characterized in that: The signal switching fixture box further comprises a protective layer (6), wherein the protective layer (6) is sleeved on the shielding layer and is coaxially arranged with the shielding layer.

5. The signal transfer fixture box according to claim 4, characterized in that: The shielding layer is made of copper braided wire; and / or the protective layer (6) is made of plastic material.

6. The signal transfer fixture box according to claim 4, characterized in that: The length of the protective layer (6), the length of the shielding layer, and the length of the connector (2) extending out of one end of the box body (1) increase in sequence, and the end of the protective layer (6) facing the box body (1) is flush with the end of the shielding layer facing the box body (1).

7. The signal transfer fixture box according to claim 4, characterized in that: The signal switching fixture box further comprises an insulating layer (7), wherein two insulating layers (7) are provided, and the two insulating layers (7) are respectively provided between the connector (2) and the shielding layer, and between the shielding layer and the protective layer (6).

8. The signal transfer fixture box according to claim 7, characterized in that: The insulating layer (7) is made of rubber material.

9. The signal transfer fixture box according to claim 7, characterized in that: The length of the insulating layer (7) between the connector (2) and the shielding layer is greater than or equal to the length of the shielding layer, and the length of the insulating layer (7) between the shielding layer and the protective layer (6) is greater than or equal to the length of the protective layer (6).

10. A resistance measuring instrument, characterized in that: It comprises a measuring instrument body and a signal transfer fixture box as claimed in any one of claims 1 to 9, wherein the measuring instrument body is provided with interfaces whose number corresponds to the number of the connecting plugs (2), and the connecting plugs (2) can be selectively plugged into the interfaces.

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