CN220019849U

CN220019849U - Line impedance stabilization network calibration fixture

Info

Publication number: CN220019849U
Application number: CN202223485450.3U
Authority: CN
Inventors: 林宏
Original assignee: Guizhou Aerospace Institute of Measuring and Testing Technology
Current assignee: Guizhou Aerospace Institute of Measuring and Testing Technology
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-11-14
Anticipated expiration: 2032-12-26

Abstract

The utility model discloses a line impedance stabilization network calibration fixture which comprises an insulating plate, a live wire metal grounding plate, a grounding metal wiring plate and an N-type female flange. The live wire metal grounding plate is provided with a first connecting part which is used for being connected with a preset equipment end; the grounding metal wiring board is provided with a second connecting part which is used for being connected with a preset grounding end; the N-type female flange comprises a chassis and a signal inner core; the chassis is fixed on the insulating plate, the chassis is fixedly connected with the grounding metal wiring board, and the signal inner core penetrates through the insulating plate to be fixedly connected with the live wire metal grounding board. The utility model can convert the grounding end and the equipment end of the line impedance stabilizing network into N-type coaxial interfaces, thereby meeting the calibration factors and the calibration of impedance parameters of the line impedance stabilizing network of the network analyzer.

Description

Line impedance stabilization network calibration fixture

Technical Field

The utility model belongs to the technical field of radio metering, and particularly relates to a line impedance stabilizing network calibration clamp.

Background

The line impedance stabilizing network is an important electromagnetic compatibility testing device and is mainly used for measuring continuous disturbance voltage emitted by a tested switching power supply along a power line to a power grid. The line impedance stabilizing network provides a stable impedance to the switch power supply under test in the radio frequency range, isolates the switch power supply under test from high frequency interference on the power grid, and then couples the interference voltage to the receiver. In the measurement of conduction and radiation emission, the tested equipment and the power supply are directly connected into the line impedance stabilizing network, so that the test can be implemented according to the uniform power supply impedance, and the test can be compared with each other even if the test is carried out in different laboratories. The line impedance stabilizing network is equipped with three terminals: the device comprises a power end connected with a power supply, a device end connected with tested equipment and a harassment output end connected with test equipment.

To ensure the accuracy of the conductive disturbance test results, the performance of the line impedance stabilization network must first meet the specifications. The stable network of circuit impedance is as an electronic measuring instrument, and in the use, inside components and parts can take place ageing, and the time has been prolonged and can lead to self performance to drop, produces great deviation with the nominal value, if the index of stable network of circuit impedance is inconsistent, can make the test result inaccurate, influences product performance.

A comprehensive microwave measuring instrument for network analyzer can scan and measure in wide frequency band to determine network parameters. Is known as a microwave network analyzer. The network analyzer is a new instrument for measuring network parameters, can directly measure complex scattering parameters of active or passive, reversible or irreversible double-port and single-port networks, and gives out the amplitude and phase frequency characteristics of each scattering parameter in a sweep frequency mode. The automatic network analyzer can correct the error of the measured result point by point and convert the measured result into tens of other network parameters, such as transmission parameters of impedance (or admittance), input reflection coefficient, output reflection coefficient, isolation, orientation, etc. The using method of the network analyzer is as follows: the output end of the tested equipment is connected with the receiving end of the network analyzer.

When the working frequency of the line impedance stabilizing network is 9 kHz-108 MHz, the output end and the receiving end of the network analyzer are connected by adopting an N-type interface, and the input end of the line impedance stabilizing network is in a terminal form of a binding post, so that the calibration factors and the calibration parameters of the line impedance stabilizing network of the network analyzer cannot be satisfied.

Disclosure of Invention

The utility model aims to provide a line impedance stabilizing network calibration fixture, which is applicable to the type that a line impedance stabilizing network power interface is a binding post, and can convert the grounding end and the equipment end of a line impedance stabilizing network into N-type coaxial interfaces so as to further meet the calibration factors and the calibration impedance parameters of the line impedance stabilizing network of a network analyzer.

To achieve the above object, according to one aspect of the present utility model, there is provided a line impedance stabilization network calibration jig comprising:

an insulating plate;

the fire wire metal grounding plate is provided with a first connecting part which is used for being connected with a preset equipment end;

the grounding metal wiring board is provided with a second connecting part which is used for being connected with a preset grounding end;

the N-type female flange comprises a chassis and a signal inner core;

the chassis is fixed on the insulating plate, the chassis is fixedly connected with the grounding metal wiring board, and the signal inner core penetrates through the insulating plate to be fixedly connected with the live wire metal grounding board.

Further, the first connection portion and the second connection portion are respectively provided at the live wire metal ground plate and the ground metal wiring plate at a position 25 mm-45 mm away from the signal inner core.

Further, the first connecting portion is a first connecting U-shaped groove.

Further, the width of the notch of the first connecting U-shaped groove is not smaller than 3mm.

Further, the second connecting part is a second connecting U-shaped groove.

Further, the width of the notch of the second connecting U-shaped groove is not smaller than 50mm.

Further, the live wire metal grounding plate and the grounding metal wiring plate are both made of copper-zinc alloy.

Further, the insulating plate is made of polyethylene.

Further, the signal inner core is fixedly connected with the live wire metal grounding plate through welding.

Further, the chassis is fixedly connected with the insulating plate and the grounding metal wiring board through screws, buckles or locking pieces.

By applying the technical scheme of the utility model, the chassis of the N-type female flange plate is fixed on the insulating plate, the signal inner core penetrates through the insulating plate to be fixedly connected with the live wire metal grounding plate, and then the grounding metal wiring plate is fixedly connected with the chassis; therefore, the line impedance stabilizing network calibration fixture can be successfully assembled, and is simple in structure and convenient to assemble.

In addition, a first connecting part is arranged on the live wire metal grounding plate, and a second connecting part is arranged on the grounding metal wiring plate. By arranging the first connecting part and the second connecting part, in the actual calibration process, the grounding end of the line impedance stabilizing network is connected with the second connecting part, and the equipment end of the line impedance stabilizing network is connected with the first connecting part; and finally, connecting the N-type female flange with a test port of the network analyzer, so that the ground end and the equipment end of the line impedance stabilizing network can be converted into N-type coaxial interfaces, and the calibration factors and the calibration of impedance parameters of the line impedance stabilizing network of the network analyzer are further satisfied.

That is, the utility model converts the grounding end and the equipment end of the line impedance stabilization network into N-type coaxial interfaces, the signal inner core is fully contacted with the equipment end of the line impedance stabilization network, the live wire metal grounding plate is fully isolated from the grounding metal wiring plate through the insulating plate, the influence of parasitic parameters on port mismatch is reduced, and the accuracy of the calibration of the line impedance stabilization network instrument is provided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

FIG. 1 is a front view of a line impedance stabilization network calibration jig according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a calibration fixture for a line impedance stabilization network according to an embodiment of the present utility model;

FIG. 3 is a dimensional design of a line impedance stabilization network calibration jig according to an embodiment of the present utility model;

fig. 4 is a diagram of interface types between a device end and a ground end of a line impedance stabilizing network according to an embodiment of the present utility model;

fig. 5 is a schematic diagram of a calibration of a line impedance stabilization network using a line impedance stabilization network calibration jig disclosed in an embodiment of the present utility model.

Reference numerals illustrate:

10. an insulating plate; 20. a live wire metal grounding plate; 21. a first connection portion; 30. a grounded metal wiring board; 31. a second connecting portion; 40. an N-type female flange plate; 41. a chassis; 42. a signal inner core.

Detailed Description

The advantages and features of the present utility model will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings and detailed description. It should be noted that the drawings are in a very simplified form and are adapted to non-precise proportions, merely for the purpose of facilitating and clearly aiding in the description of embodiments of the utility model.

It should be noted that, in order to clearly illustrate the present utility model, various embodiments of the present utility model are specifically illustrated by the present embodiments to further illustrate different implementations of the present utility model, where the various embodiments are listed and not exhaustive. Furthermore, for simplicity of explanation, what has been mentioned in the previous embodiment is often omitted in the latter embodiment, and therefore, what has not been mentioned in the latter embodiment can be referred to the previous embodiment accordingly.

Referring to fig. 1 to 5, according to an embodiment of the present utility model, there is provided a line impedance stabilization network calibration jig mainly for connecting a line impedance stabilization network with a network analyzer or an impedance analyzer, thereby calibrating performance of the line impedance stabilization network using the network analyzer or the impedance analyzer; the utility model is mainly described by taking a network analyzer as an example. As shown in fig. 5, a calibration schematic of the line impedance stabilization network is provided using a line impedance stabilization network calibration jig. In the actual calibration process, the predetermined equipment end is connected with the first connecting portion 21, the predetermined grounding end is connected with the second connecting portion 31, and the N-type female flange 40 is connected with the test port of the network analyzer, so that the calibration of the line impedance stabilizing network can be performed. The predetermined equipment end in the utility model refers to the equipment end of the line impedance stabilizing network, and the predetermined grounding end refers to the grounding end of the line impedance stabilizing network.

Referring to fig. 1 to 3, the line impedance stabilizing network calibration jig in this embodiment includes an insulating plate 10, a live metal ground plate 20, a ground metal wiring plate 30, and an N-type female flange 40. The live wire grounding plate 20 is provided with a first connecting part 21, and the first connecting part 21 is used for being connected with a preset equipment end; the ground metal wiring board 30 is provided with a second connection portion 31, and the second connection portion 31 is for connection with a predetermined ground terminal. The N-type female flange 40 includes a chassis 41 and a signal core 42, where the chassis 41 is fixed on the insulating board 10, and the chassis 41 is fixedly connected with the grounding metal wiring board 30, and the signal core 42 passes through the insulating board 10 and is fixedly connected with the live wire metal grounding board 20.

When the line impedance stabilizing network calibration fixture is actually used, the chassis 41 of the N-type female flange 40 is fixed on the insulating plate 10, the signal inner core 42 penetrates through the insulating plate 10 to be fixedly connected with the live wire metal grounding plate 20, and then the grounding metal wiring plate 30 is fixedly connected with the chassis 41; therefore, the line impedance stabilizing network calibration fixture can be successfully assembled, and is simple in structure and convenient to assemble.

The first connection portion 21 is provided on the live metal ground plate 20, and the second connection portion 31 is provided on the ground metal wiring plate 30. By providing the first connection part 21 and the second connection part 31, in the actual calibration process, the ground end of the line impedance stabilization network is connected with the second connection part 31, and the equipment end of the line impedance stabilization network is connected with the first connection part 21; finally, the N-type female flange 40 is connected with a test port of the network analyzer, so that the ground end and the equipment end of the line impedance stabilization network can be converted into N-type coaxial interfaces, and the calibration factors and the calibration parameters of the line impedance stabilization network of the network analyzer are further satisfied.

That is, according to the present utility model, the first connection portion 21 provided on the N-type female flange 40 and the live wire grounding plate 20, the second connection portion 31 provided on the grounding metal wiring plate 30 can connect the grounding end of the line impedance stabilization network with the second connection portion 31, and the equipment end of the line impedance stabilization network is connected with the first connection portion 21; finally, the N-type female flange 40 is connected to a test port of a network analyzer. Therefore, the grounding end and the equipment end of the line impedance stabilizing network can be converted into N-type coaxial interfaces, and further the calibration factors and the calibration of impedance parameters of the line impedance stabilizing network of the network analyzer are met, and the device is simple in structure and convenient to operate.

Specifically, at a distance of 25mm to 45mm, for example 25mm, 30mm, 45mm, from the signal core 42, a first connection portion 21 and a second connection portion 31 are provided at the live metal ground plate 20 and the ground metal wiring plate 30, respectively. Referring to fig. 4, the interface types between the equipment end and the ground end of the line impedance stabilizing network are shown; when the first connection portion 21 and the second connection portion 31 are provided less than 25mm from the signal core 42, when the EUD live wire end is connected with the first connection portion 21, the EUD live wire end is connected with the second connection portion 31, and the EUD live wire end are caught at the upper end at the time of connection. When the first connection portion 21 and the second connection portion 31 are provided more than 45mm from the signal core 42, the EUD live wire end and the EUD ground wire end are increased in cost on the premise that they are not caught at the time of connection.

Specifically, the first connection portion 21 is a first connection U-shaped groove, and the first connection portion 21 is set to be the first connection U-shaped groove, so that the first connection U-shaped groove can be better connected with the equipment end of the line impedance stabilizing network, as shown in fig. 2, the first connection U-shaped groove has an arc, and through the effect of the arc, hands cannot be cut when the first connection U-shaped groove is connected with the equipment end.

Further, the width of the notch of the first connecting U-shaped groove is not less than 3mm, such as 3mm, 3.5mm, 4mm. The device end that is provided with the size that is less than 3mm, 3.5mm, or 4mm can all be connected with first connection U type groove so as to set up, can adapt to the device end of multiple size to the stable network of multiple circuit impedance of adaptation improves calibration efficiency.

Specifically, the second connection portion 31 is a second connection U-shaped groove. The first connecting portion 21 is set to be a first connecting U-shaped groove, and can be better connected with the grounding end of the line impedance stabilizing network, as shown in fig. 2, the second connecting U-shaped groove is also provided with an arc, and hands cannot be cut when the second connecting U-shaped groove is connected with the grounding end through the action of the arc, so that the effect of protecting the user is achieved. If the first connecting portion 21 and/or the second connecting portion 31 are provided as other shaped grooves, such as square grooves or rectangular grooves, there is no arc, and it is easy to scratch the hand.

Further, the width of the notch of the second connecting U-shaped groove is not less than 50mm, such as 50mm, 55mm, 60mm. The arrangement is that the grounding end with the size smaller than 50mm, 55mm or 60mm can be connected with the second connecting U-shaped groove, the grounding end with various sizes can be adapted, the impedance stabilizing network of various lines can be adapted, and the calibration efficiency is improved.

Specifically, the live metal ground plate 20 and the ground metal terminal plate 30 are both made of a copper-zinc alloy. The copper-zinc alloy has the advantages of oxidation resistance, wear resistance and the like, and when the live wire metal grounding plate 20 and the grounding metal wiring plate 30 are both made of the copper-zinc alloy, the service life can be greatly prolonged.

Further, the insulating plate 10 is made of polyethylene. Polyethylene has excellent electrical insulation property, good chemical stability, resistance to most of acid and alkali corrosion, insolubility in common solvents at normal temperature, low water absorption and corrosion resistance. An insulating plate 10 made of polyethylene, which sufficiently isolates the live wire grounding plate 20 from the grounding metal wiring plate 30 by virtue of excellent electrical insulation properties of polyethylene; the service life of the insulating plate 10 can be greatly prolonged by the performances of corrosion resistance, heat resistance and the like of polyethylene, so that the service life of the line impedance stabilizing network calibration fixture is prolonged.

Specifically, the signal core 42 is fixedly connected to the live metal ground plate 20 by welding. Optionally, the signal core 42 is connected to the live metal ground plate 20 by soldering, so that the signal core 42 is guaranteed to be fully contacted with the live metal ground plate 20, and other problems caused by poor contact are avoided.

Specifically, the chassis 41 and the insulating plate 10, and the chassis 41 and the grounding metal wiring board 30 are fixedly connected by screws, snaps, or locking members. Thus, the chassis 41 and the insulating plate 10 and the chassis 41 and the grounding metal wiring board 30 can be fixed, so that the whole line impedance stabilizing network calibration fixture is assembled, and the structure is simple and the operation is convenient.

As shown in fig. 3, the specific dimensions of one line impedance stabilizing network calibration fixture according to the present utility model are as follows:

wherein, the height of the N-type female flange 40 is 30mm; the thickness of the chassis 41 is 2mm and the side length is 30mm.

The thickness of the insulating plate 10 was 2mm, the length was 45mm, and the width was 30mm.

The length of the grounding metal wiring board is 100mm, the thickness is 2mm, the width is 30mm, the second connecting portion 31 is arranged at the position 30mm away from the signal inner core 42, and the notch width of the second connecting portion 31 is 50mm.

The length of live wire metal wiring board is 50mm, and thickness is 2mm, and the width is 30mm, sets up first connecting portion 21 in the department from signal inner core 42 30mm, and the notch width of first connecting portion 21 is 3mm.

From the above description, it can be known that:

with the line impedance stabilizing network calibration fixture of the present utility model, the chassis 41 of the N-type female flange 40 is fixed on the insulating board 10 by screws, buckles or locking members, the signal inner core 42 passes through the insulating board 10 and is fixedly connected with the live wire metal grounding board 20 by welding, and then the grounding metal wiring board 30 is fixedly connected with the chassis 41 by screws, buckles or locking members. Insulating plate 10 may substantially isolate live metal ground plate 20 from ground metal terminal plate 30; the grounded metal wiring board 30 is connected with the chassis 41, and ensures that the ground end of the network analyzer is connected with the ground end of the impedance matching stabilization network, so that the ground potentials of the two are the same.

The first connection portion 21 is provided on the live metal ground plate 20, and the second connection portion 31 is provided on the ground metal wiring plate 30. By providing the first connection part 21 and the second connection part 31, in the actual calibration process, the ground end of the line impedance stabilization network is connected with the second connection part 31, and the equipment end of the line impedance stabilization network is connected with the first connection part 21; finally, the N-type female flange 40 is connected with a test port of the network analyzer, so as to meet the calibration factor and the calibration of the impedance parameters of the network analyzer on the line impedance stabilization network.

That is, the utility model converts the ground terminal and the equipment terminal of the line impedance stabilization network into N-type coaxial interfaces, the signal inner core 42 is fully contacted with the equipment terminal of the line impedance stabilization network, the live wire metal grounding plate 20 is fully isolated from the ground metal wiring plate 30 by the insulating plate 10, the influence of parasitic parameters on port mismatch is reduced, and the accuracy of the calibration of the line impedance stabilization network instrument is provided.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A line impedance stabilization network calibration jig, comprising:

an insulating plate (10);

a live wire metal grounding plate (20), wherein the live wire metal grounding plate (20) is provided with a first connecting part (21), and the first connecting part (21) is used for being connected with a preset equipment end;

the grounding metal wiring board (30), the grounding metal wiring board (30) is provided with a second connecting part (31), the second connecting part (31) is used for being connected with a preset grounding end, the second connecting part (31) is a second connecting U-shaped groove, and the width of a notch of the second connecting U-shaped groove is not smaller than 50mm;

an N-type female flange (40), wherein the N-type female flange (40) comprises a chassis (41) and a signal inner core (42);

the chassis (41) is fixed on the insulating plate (10), the chassis (41) is fixedly connected with the grounding metal wiring board (30), and the signal inner core (42) penetrates through the insulating plate (10) to be fixedly connected with the live wire metal grounding board (20).

2. Line impedance stabilizing network calibration jig according to claim 1, characterized in that said first connection portion (21) and said second connection portion (31) are provided at said live metal ground plate (20) and said ground metal wiring plate (30) at a distance of 25-45 mm from said signal core (42), respectively.

3. Line impedance stabilizing network calibration jig according to claim 1, characterized in that said first connection portion (21) is a first connection U-shaped groove.

4. A line impedance stabilizing network calibration fixture according to claim 3 wherein the width of the notch of said first connection U-shaped slot is no less than 3mm.

5. The line impedance stabilizing network calibration fixture of claim 1, wherein said live metal ground plate (20) and said ground metal terminal plate (30) are each made of a copper zinc alloy.

6. Line impedance stabilizing network calibration jig according to claim 1, characterized in that said insulating plate (10) is made of polyethylene.

7. The line impedance stabilizing network calibration fixture of claim 1, wherein said signal core (42) is fixedly connected to said live metal ground plate (20) by welding.

8. Line impedance stabilizing network calibration jig according to claim 1, characterized in that the chassis (41) and the insulating plate (10) and the chassis (41) and the grounded metal wiring board (30) are fixedly connected by screws, snaps or locks.