CN218630152U

CN218630152U - Adapter for terminal-to-terminal connection of terminal impedance standard device

Info

Publication number: CN218630152U
Application number: CN202222624387.0U
Authority: CN
Inventors: 黄璐; 杨雁; 白天; 王维; 黄晓钉
Original assignee: National Institute of Metrology
Current assignee: National Institute of Metrology
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-03-14
Anticipated expiration: 2032-09-30

Abstract

The utility model relates to the technical field of impedance standard device wiring, and provides an adapter for terminal impedance standard device wiring by turning, which aims to solve the technical problem of larger measurement error generated by terminal button wiring, and comprises a base and a coaxial contact element; the coaxial contact piece comprises a metal shell and a center contact piece arranged in the metal shell; the coaxial contact piece penetrates through the base; one end of the coaxial contact piece extending out of the bottom surface of the base serves as an inner end; the inner end of the coaxial contact element is used for connecting a terminal button of the terminal button impedance standard through a coaxial connecting wire, so that the central contact element is connected with the terminal button impedance standard through a core wire of the coaxial connecting wire, and the metal shell is connected with an outer skin of the coaxial connecting wire; the portion of the metal shell at the inner end is used to connect the shield shell of the terminal impedance standard through a ground wire. The utility model discloses the distribution parameter that can the traditional termination line of greatly reduced connects the method to introduce has improved impedance standard ware measuring accuracy and repeatability.

Description

Adapter for terminal-to-terminal connection of terminal impedance standard device

Technical Field

The utility model relates to an impedance standard ware wiring technical field, concretely relates to adapter to measuring instrument to impedance standard ware that has the terminal button.

Background

In conventional impedance (resistance) standards, a four terminal connection method is generally used. In the process of using and testing the standard device, the impedance standard device is fixedly connected with the measuring instrument equipment by a connecting wire with a U-shaped inserting sheet. In the measurement of the alternating-current impedance standard device, unfixed measurement errors can be introduced by distributed capacitance and mutual inductance among the four connecting wires, so that the accuracy of the measured impedance standard device is reduced, and the condition is more obvious under the frequency condition of more than 1 kHz.

Experiments show that the four-terminal butt joint method can not only reduce the distributed capacitance and mutual inductance in the four-wire connection method, but also reduce the influence of an external electromagnetic field. The four-terminal butt joint method is characterized in that two potential terminal buttons are used for obtaining potential, two current terminal buttons are used for obtaining current, the two current terminal buttons are connected with an impedance standard device in series through lead wires, the two potential terminal buttons are respectively connected between two ends of the impedance standard device and the lead wires of the two current terminal buttons through respective lead wires, however, the four-terminal butt joint method is based on the four-terminal butt joint method, the terminal buttons are connected with the impedance standard device through coaxial lead wires, and core currents and skin currents of four coaxial lead wires of the four-terminal impedance standard device are required to be equal in size and opposite in direction. Therefore, the four-terminal butt joint method is mostly applied to the measurement of standard devices, and how to convert the four-terminal butt joint method of some standards into the four-terminal butt joint method is an urgent problem to be solved in the measurement of ac standards.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve the difficult problem that exists among the above-mentioned prior art, provide an adapter that is used for terminal knob impedance standard ware to change butt joint line, can connect the terminal knob to connect the method conversion to the butt joint method to reduce measuring error.

The utility model discloses a realize through following technical scheme: an adapter for terminal-to-terminal connection of a terminal impedance standard is characterized by comprising a base and a coaxial contact piece; the coaxial contact element comprises a metal shell and a central contact element arranged in the metal shell; the coaxial contact penetrates through the base; one end of the coaxial contact piece extending out of the bottom surface of the base is used as an inner end; the inner end of the coaxial contact element is used for connecting a terminal button of a terminal button impedance standard device through a coaxial connecting wire, so that the central contact element is connected with the terminal button impedance standard device through a core wire of the coaxial connecting wire, and the metal shell is connected with an outer skin of the coaxial connecting wire; the part of the metal shell at the inner end is used for connecting the shielding shell of the terminal impedance standard through the ground wire.

Furthermore, the base is provided with 2 or more coaxial contact elements.

Furthermore, the sheath connecting gasket is made of a conductive material and comprises a sleeving petal and a core bridge; the number of the sleeving petals is equal to that of the coaxial contact pieces, and each sleeving petal is correspondingly sleeved on the inner end of each coaxial contact piece and is in contact with the metal shell; the sleeving petals are connected through a core bridge; the core bridge is used for connecting the shielding shell of the terminal button impedance standard through the ground wire.

The terminal button impedance standard device further comprises a support and a lock frame, wherein the support is provided with a wiring operation window, and the lock frame is detachably connected with a wiring end of the terminal button impedance standard device and is fixed on the terminal button impedance standard device through a locking structure; the bottom surface of base is installed in the support upper end, and the lock frame is installed at the support lower extreme to can fix support and base on the terminal button impedance standard ware through the lock frame.

Furthermore, the support and the lock frame are made of insulating materials.

Furthermore, the lock frame is annular, the support is cylindrical with a stepped hole, and the end face of the large end of the stepped hole of the support serves as the lower end of the support and is connected with the lock frame; after the lock frame is sleeved with the end button impedance standard device, the step surface of the stepped hole can be clamped on the end surface of the end button impedance standard device to form the locking structure.

Furthermore, one end of the coaxial connecting wire is a plug or a socket for inserting the coaxial contact element, and the other end of the coaxial connecting wire is a U-shaped inserting sheet; one end of the ground wire is welded on the connecting gasket of the outer skin, and the other end of the ground wire is a U-shaped inserting piece.

Compared with the prior art, the beneficial effects of the utility model include:

1. the metal shell of the coaxial contact element and the center contact element arranged in the metal shell are mutually electrically insulated, and then the center contact element of the coaxial contact element is mutually connected with the impedance standard device through a core wire of a coaxial connecting wire to form an end button connection method, which is equivalent to a core of a coaxial lead wire required by the end button connection method; the metal shell of the coaxial contact element is connected with the shielding shell through the ground wire and is connected with the outer skin of the coaxial connecting wire at the same time, so that the metal shell of the coaxial contact element is electrically connected with the shielding shell of the impedance standard device through the outer skin of the coaxial connecting wire and the ground wire, and the metal shell is equivalent to the outer skin of a coaxial lead wire required by an end-to-end connection method; therefore, the utility model discloses simulate out the core and the skin of the coaxial lead wire that the required adoption of butt joint method, can realize the terminal button butt joint method.

2. The plurality of coaxial contact pieces can share the same ground wire through the sheath connecting gasket, so that the structure is simplified, the number of the ground wires is reduced, and the generation of distributed capacitance is naturally reduced.

3. The support provides the accommodation space for the coaxial connecting wire, avoids the position of coaxial connecting wire to be too in disorder, and after the support is fixed through the lock frame, coaxial connecting wire position relatively fixed reduces because of the too big great uncertainty measuring error that brings of distribution parameter variability that arouses of coaxial connecting wire position randomness.

4. The U-shaped inserting pieces on the coaxial connecting line and the ground wire are both suitable for being connected with a terminal knob impedance standard device with a bolt binding post.

5. The height range of the bracket can ensure normal wiring operation, and the length of the coaxial connecting wire can be prolonged by avoiding too high height, so that the distribution parameter is prevented from being increased due to too long coaxial connecting wire.

Drawings

FIG. 1 is a schematic configuration diagram of an adapter according to embodiment 1;

FIG. 2 is a schematic configuration diagram of an adapter according to embodiment 2;

FIG. 3 is a top view of FIG. 2;

fig. 4 is a bottom view of fig. 2.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example 1

As shown in fig. 1, an adapter for terminal-to-terminal connection of a terminal impedance standard comprises a base 10 and a coaxial contact 20; the coaxial contact 20 comprises a metal shell and a center contact arranged in the metal shell; the coaxial contact 20 penetrates through the base 10; one end of the coaxial contact piece extending out of the bottom surface of the base is used as an inner end; the inner end of the coaxial contact piece is used for connecting a terminal button of a terminal button impedance standard through a coaxial connecting wire 40, so that the center contact piece is connected with the terminal button impedance standard through a core wire of the coaxial connecting wire, and the metal shell is connected with an outer skin of the coaxial connecting wire; the portion of the metal shell at the inner end is used to connect the shield of the terminal impedance standard through a ground wire 50.

The utility model discloses an adapter is according to the quantity that the terminal button quantity on the terminal button impedance standard device confirmed coaxial contact, and is common 2 or 4, consequently, is equipped with 2 or the coaxial contact more than 2 on the base.

In this embodiment, the skin connection pad is made of a conductive material, and includes a sleeve joint flap and a core bridge; the number of the sleeving petals is equal to that of the coaxial contact elements, and each sleeving petal is correspondingly sleeved on the inner end of each coaxial contact element and is in contact with the metal shell; the sleeving petals are connected through a core bridge; the core bridge is used for connecting the shielding shell of the terminal impedance standard through the ground wire.

The plurality of coaxial contact pieces can share the same ground wire through the sheath connecting gasket, so that the structure is simplified, the number of the ground wires is reduced, and the generation of distributed capacitance is naturally reduced.

In this embodiment, the coaxial contact is a socket or a plug, and the corresponding central contact is a socket or a pin. The convenience is pegged graft with coaxial connecting line, forms and can dismantle the connection, and it is more convenient to work a telephone switchboard.

In this embodiment, for the terminal impedance standard having the bolt terminal, one end of the coaxial connection line is a plug or a socket for plugging the coaxial contact, and the other end is a U-shaped insertion piece; one end of the ground wire is welded on the connecting gasket of the outer skin, and the other end of the ground wire is a U-shaped inserting piece.

Of course, the U-shaped insert of the coaxial connection line can be replaced by a corresponding structure according to the difference of the terminal structure of the terminal impedance standard.

The embodiment forms end-to-end connection, can obviously reduce distributed capacitance and mutual inductance, and can also reduce the influence of an external electromagnetic field, thereby greatly reducing the measurement error.

Example 2

In order to further reduce the influence of the distribution parameters, especially reduce the influence of the distribution parameters not being fixed, the present embodiment adds a bracket and lock frame structure on the basis of embodiment 1.

Specifically, referring to fig. 2 to 4, an adapter for terminal impedance standard adaptor terminal-to-terminal connection includes a base 10 and a coaxial contact 20; the coaxial contact comprises a metal shell 21 and a center contact 22 arranged in the metal shell; the coaxial contact penetrates through the base 10; one end of the coaxial contact 20 extending out of the bottom surface of the base 10 serves as an inner end; the inner end of the coaxial contact element 20 is used for connecting the terminal of the terminal impedance standard through a coaxial connecting wire, so that the central contact element 22 is connected with the terminal impedance standard through the core wire of the coaxial connecting wire, and the metal shell is connected with the outer skin of the coaxial connecting wire; the portion of the metal shell at the inner end is used to connect the shield of the terminal impedance standard through ground 50. The terminal device further comprises a support 60 and a lock frame 70, wherein the support is provided with a wiring operation window, and the lock frame is detachably connected with a wiring terminal of the terminal button impedance standard device and fixed on the terminal button impedance standard device through a locking structure; the bottom surface of base is installed in the support upper end, and the lock frame is installed at the support lower extreme to can fix support and base on the terminal button impedance standard ware through the lock frame. The upper end and the lower end of the bracket are respectively connected with the base and the lock frame through bolts.

In this embodiment, the bracket and the lock bracket are made of an insulating material, such as teflon. And distributed capacitance is prevented from being formed among the coaxial connecting wire, the bracket and the lock frame.

In this embodiment, the lock frame is annular, the bracket is cylindrical with a stepped hole, and the end surface of the large end of the stepped hole of the bracket is used as the lower end of the bracket and connected with the lock frame; after the lock frame is sleeved with the terminal impedance standard, the step surface of the stepped hole can be clamped on the end surface of the terminal impedance standard, so that the locking structure is formed.

In this embodiment, the lock frame is circular ring-shaped, and the support is cylindrical with a stepped hole. Aiming at the condition that the terminal knob impedance standard device is cylindrical, when the terminal knob impedance standard device is in other shapes, the shapes of the lock frame and the bracket can be changed adaptively.

In this embodiment, the height of the support is 70-100 mm. The height range of the support can ensure normal wiring operation, and the length of the coaxial connecting line can be prolonged due to the fact that the height of the support is too high, so that the distribution parameters are prevented from being increased due to too long coaxial connecting lines.

In this embodiment, the coaxial contacts 20 are sockets or plugs and the corresponding center contact 22 is a socket or pin. The convenience is pegged graft with coaxial connecting line, forms and can dismantle the connection, and it is more convenient to work a telephone switchboard. The pins are typically made of brass or gold plated (thickened); the jacks are typically made of tin bronze or beryllium bronze, gold plated.

The coaxial contact 20 may be a coaxial socket or plug of various standards such as SMA, BNC, TNC, BPO, etc., for example, a SMA (Sub MiniatureA) socket.

In this embodiment, a skin connection pad 30 made of conductive material (such as brass) is also included, and the skin connection pad includes a socket flap and a core bridge; the number of the sleeving lobes is equal to that of the coaxial contact elements, and each sleeving lobe is sleeved on the inner end of each coaxial contact element correspondingly and is in contact with the metal shell 21: the nut of the coaxial contact 20 itself connects the sheath connection pad 30 and the metal shell of the coaxial contact 20 together. The sleeving petals are connected through a core bridge; the core bridge is used for connecting the shielding shell of the terminal button impedance standard through the ground wire.

The adapter of the embodiment is used for the four-terminal impedance standard device, the lock frame 70 is sleeved on the four-terminal impedance standard device, the lock frame 70 and the support 60 are fixed by screws, and the step surface of the stepped hole of the support 60 is clamped on the end surface of the four-terminal impedance standard device, so that the adapter is prevented from sliding downwards, and through connection of the lock frame 70 and the support 60, the adapter is ensured to be stably fixed on the impedance standard device to be measured, so that the distribution parameters of the adapter are determined, and the accuracy and the repeatability of measurement are ensured.

The utility model discloses the distribution parameter that can the traditional termination line of greatly reduced connects the method to introduce has improved impedance standard ware measuring accuracy and repeatability.

In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

The above technical solution is only an implementation manner of the present invention, and for those skilled in the art, on the basis of the disclosed principle, various modifications or variations can be easily made, and the present invention is not limited to the technical solution described in the above specific embodiments of the present invention, so that the foregoing description is only preferred, and has no restrictive meaning.

Claims

1. An adapter for terminal-to-terminal connection of a terminal impedance standard is characterized by comprising a base and a coaxial contact piece; the coaxial contact element comprises a metal shell and a central contact element arranged in the metal shell; the coaxial contact penetrates through the base; one end of the coaxial contact piece extending out of the bottom surface of the base is used as an inner end; the inner end of the coaxial contact element is used for connecting a terminal button of a terminal button impedance standard device through a coaxial connecting wire, so that the central contact element is connected with the terminal button impedance standard device through a core wire of the coaxial connecting wire, and the metal shell is connected with an outer skin of the coaxial connecting wire; the part of the metal shell at the inner end is used for connecting the shielding shell of the terminal impedance standard through the ground wire.

2. The adapter for terminal-to-terminal connection of a terminal impedance standard according to claim 1, wherein the base is provided with 2 or more than 2 coaxial contacts.

3. The adapter for terminal-to-terminal connection of a terminal impedance standard according to claim 2, wherein: the sheath connecting gasket is made of a conductive material and comprises a sleeving petal and a core bridge; the number of the sleeving petals is equal to that of the coaxial contact pieces, and each sleeving petal is correspondingly sleeved on the inner end of each coaxial contact piece and is in contact with the metal shell; the sleeving petals are connected through a core bridge; the core bridge is used for connecting the shielding shell of the terminal impedance standard through the ground wire.

4. The adapter for terminal-to-terminal connection of the terminal impedance standard according to claim 1, further comprising a support and a lock frame, wherein the support is provided with a connection operation window, and the lock frame is detachably connected with the connection terminal of the terminal impedance standard and fixed on the terminal impedance standard through a locking structure; the bottom surface of base is installed in the support upper end, and the lock frame is installed at the support lower extreme to can fix support and base on the terminal button impedance standard through the lock frame.

5. The adapter for terminal-to-terminal connection of a terminal impedance standard according to claim 4, wherein the bracket and the lock bracket are made of an insulating material.

6. The adapter for terminal-to-terminal connection of a terminal impedance standard according to claim 4, wherein the lock frame is annular, the support is cylindrical with a stepped hole, and the end face of the large end of the stepped hole of the support is used as the lower end of the support and connected with the lock frame; after the lock frame is sleeved with the terminal impedance standard, the step surface of the stepped hole can be clamped on the end surface of the terminal impedance standard, so that the locking structure is formed.

7. The adapter of claim 6, wherein the lock bracket is circular and the bracket is cylindrical with a stepped bore.

8. The adapter of claim 1, wherein the coaxial contact is a socket or a plug and the corresponding center contact is a socket or a pin.

9. The adapter for terminal-to-terminal connection of a terminal impedance standard according to claim 1, wherein one end of the coaxial connection line is a plug or a socket for plugging the coaxial contact, and the other end is a U-shaped insert; one end of the ground wire is welded on the connecting gasket of the outer skin, and the other end of the ground wire is a U-shaped inserting piece.

10. The adapter for terminal-to-terminal connection of a terminal impedance standard according to claim 4, wherein the height of the bracket is 70-100 mm.