Impedance full-automatic measuring jig

Abstract

The utility model relates to a full-automatic impedance measuring jig, which belongs to the field of PCB (printed circuit board) impedance testing and comprises a PCB body, four testing modules are arranged on the surface of the PCB body, each testing module comprises an impedance strip testing module, a connecting wire and a plurality of welding hole groups, and the welding hole groups are connected with the impedance strip testing module through the connecting wire. Each welding hole set is composed of a plurality of independent welding holes, and a square structure is defined by the multiple independent welding holes in the periphery. The impedance strip test module comprises a plurality of rows of test holes and a plurality of rows of grounding holes which are distributed at intervals, and a row of grounding holes are correspondingly formed below each row of test holes; impedance strips to be tested are arranged on the impedance strip test modules in the four test modules, and the impedance tester is connected with the welding hole group to perform batch measurement on the impedance strips to be tested; the tool can measure a plurality of tools at the same time, the measurement efficiency is high, and the cost is reduced.

Description

Technical Field

[0001] This utility model relates to a fixture, specifically an automatic impedance measurement fixture, belonging to the field of PCB impedance testing. Background Technology

[0002] PCB, or Printed Circuit Board, is an important electronic component. It serves as the support for electronic components and the carrier for their electrical interconnection. Because it is manufactured using electronic printing technology, it is called a "printed" circuit board. Almost every electronic device, from small electronic watches and calculators to large computers, communication electronic equipment, and military weapon systems, uses printed circuit boards to enable electrical interconnection between integrated circuits and other electronic components. Due to its high sealing capability, high reliability, designability, testability, and assemblability, PCB is increasingly widely used, leading to a booming PCB manufacturing industry.

[0003] In the PCB manufacturing industry, impedance testers and automatic impedance testers are mainly used to measure the impedance of finished products during the production process. The measurement process usually relies on manual operation and alignment, and only one board or one impedance bar can be measured at a time. This results in problems such as long time consumption and high error rate. For large batches of products, the workload of testing is huge, which affects efficiency and increases costs.

[0004] Currently, patent CN202799366U describes a circuit board with a layout structure beneficial for impedance testing. The board includes a board body with several in-unit graphic circuits for connecting electronic components, several single-ended impedance lines for adjusting single-ended signal transmission, and several differential impedance lines for adjusting differential signal transmission. The single-ended and differential impedance lines are arranged in the middle of the board body. The multiple impedance lines on the circuit board address the problem of multiple sets of similar impedance lines or multiple sets of single-ended and differential impedance lines on the same circuit board being difficult to test. This allows the impedance data on the circuit board to reflect the impedance of the in-unit graphic circuits and enables testing of multiple sets of impedance lines or single-ended and differential impedance lines. However, this approach is unsuitable for mass production of the same part number, as it cannot perform simultaneous multiple measurements, nor can it perform large-scale testing based on different single-ended or differential impedance lines, resulting in low efficiency and a high risk of errors.

[0005] Therefore, in order to improve the production efficiency of impedance testing and reduce measurement error rates, it is urgent to design a fully automatic impedance measurement fixture to meet production needs and combine it with automatic impedance testing equipment to achieve high efficiency in impedance testing. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a fully automatic impedance measurement fixture that can perform multiple measurements simultaneously, resulting in high measurement efficiency and reduced costs.

[0007] To solve the above technical problems, this utility model provides a fully automatic impedance measurement fixture, including a PCB board body. The surface of the PCB board body is provided with four test modules. Each test module includes an impedance bar test module, a connecting wire, and multiple soldering hole groups. The soldering hole groups are connected to the impedance bar test module through the connecting wire.

[0008] Each group of welded holes consists of multiple individual welded holes, with multiple individual welded holes surrounding a square structure.

[0009] The impedance bar test module includes multiple rows of test holes spaced apart and multiple rows of grounding holes, with a corresponding row of grounding holes below each row of test holes;

[0010] The impedance bar test module among the four test modules is equipped with impedance bars to be tested. The impedance tester is connected to the welding hole group to perform batch measurements on the impedance bars to be tested.

[0011] The further defined technical solution of this utility model is:

[0012] Furthermore, in the aforementioned fully automated impedance measurement fixture, multiple welding hole groups are distributed in the semi-circular direction of the impedance bar testing module.

[0013] The technical effect is that multiple welding hole groups are distributed in the semi-circular direction of the impedance bar test module and connected by connecting wires. Each wire is designed as a 50Ω single-ended wire. The multiple welding hole groups are distributed on one side, the line is clear and there is no signal interference.

[0014] In the aforementioned fully automatic impedance measuring fixture, each welding hole group consists of five individual welding holes. Four evenly distributed welding holes form a square structure, and a welding hole is set in the middle of the four welding holes.

[0015] Technically, this design is well-suited for impedance measurement setups and facilitates connection to impedance measurement equipment. In the aforementioned fully automated impedance measurement fixture, the impedance bar test module has three rows of test holes and three rows of grounding holes, with 10 holes in each row.

[0016] Technical advantages: This utility model features a 3-row design in the vertical Y direction, with each row capable of measuring 5 sets of differential impedance or 10 sets of single-ended impedance, effectively improving efficiency, saving time, and reducing costs.

[0017] In the aforementioned fully automatic impedance measuring fixture, the connecting wire is a 50Ω wire.

[0018] In the aforementioned fully automated impedance measurement fixture, the distance between any two adjacent modules is 5.47 inches, and the distance between the edge of the module and the edge of the PCB board body in the vertical direction is 0.11 inches.

[0019] The technical advantage is that by leaving a distance between the two modules and also keeping the edge of the module away from the edge of the PCB, this design allows for the measurement of more impedance bars at once, resulting in higher efficiency.

[0020] In the aforementioned fully automatic impedance measurement fixture, the impedance bars to be measured include single-ended impedance bars and coupled differential impedance bars. In the single-ended impedance bars, the upper row is provided with test holes for connecting signal lines, and the lower row is provided with grounding holes for grounding. In the coupled differential impedance bars, the upper row is provided with test holes for routing lines, and the lower row is provided with grounding holes for grounding.

[0021] In the aforementioned fully automatic impedance measurement fixture, the impedance bar has NPTH positioning holes at both ends, and the center distance between the two NPTH positioning holes is 5.47 inches.

[0022] In the aforementioned fully automated impedance measurement fixture, the impedance bar has a fixed length of 5.6 inches and a width of 0.21 inches, and the signal line on the impedance bar has a length of 4.2 inches.

[0023] The beneficial effects of this utility model are:

[0024] Because the test holes and grounding holes on impedance bars of different PCB models vary greatly and cannot be standardized, this utility model designs the test holes and grounding holes to be arranged vertically, with the test holes on top and the grounding holes on the bottom, to match the impedance bars of the same type and facilitate measurement.

[0025] This invention features four test modules on the PCB board body, with each test module containing an impedance bar test module. Each module has three rows of test holes corresponding to three rows of grounding holes, allowing for the simultaneous installation of multiple impedance bars. This design offers high measurement efficiency and is suitable for mass production. For single-ended impedance bars, each test module can test 1-3 bars; for differential impedance bars, each module can test 1-3 bars.

[0026] The test time for impedance testing using this invention is reduced by 70% compared to conventional testing, while production capacity is increased by approximately 80%. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the fully automatic impedance measuring fixture according to an embodiment of the present invention;

[0028] Figure 2 for Figure 1 Schematic diagram of the impedance bar test module;

[0029] Figure 3 for Figure 1 Enlarged view of the middle section;

[0030] Figure 4 This is a schematic diagram of the structure of the coupled differential impedance bar in the impedance bar to be tested;

[0031] Figure 5 This is a schematic diagram of the impedance bar layout in an embodiment of this utility model;

[0032] In the diagram: 1-PCB board body, 2-impedance bar test module, 21-test hole, 22-grounding hole, 3-connecting wire, 4-soldering hole group. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them; the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0034] This embodiment provides a fully automatic impedance measurement fixture, the structure of which is as follows: Figure 1 As shown, the PCB board body 1 is provided with four test modules on its surface. Each test module includes an impedance bar test module 2, a connecting line 3, and multiple solder hole groups 4. The solder hole groups 4 are connected to the impedance bar test module 2 through the 50Ω connecting line 3. The multiple solder hole groups 4 are distributed in the semi-circular direction of the impedance bar test module 2.

[0035] like Figure 3 As shown, each welding hole group 4 consists of five individual welding holes. The four evenly distributed welding holes form a square structure, and a welding hole is set in the middle of the four welding holes.

[0036] like Figure 2 As shown, the impedance bar test module 2 includes three rows of test holes 21 and three rows of grounding holes 22 spaced apart. A row of grounding holes 22 is set below each row of test holes 21. Each row has 10 holes. Each row can measure 5 sets of differential impedance or 10 sets of single-ended impedance, which effectively improves efficiency, saves time and reduces costs.

[0037] In this embodiment, as Figure 1As shown, the distance between any two adjacent modules in the four modules is 5.47 inches, and the distance between the edge of the module and the edge of the PCB body 1 in the vertical direction is 0.11 inches.

[0038] In this embodiment, as Figure 4 As shown, the impedance bar to be tested includes a single-ended impedance bar and a coupled differential impedance bar. In the single-ended impedance bar, the upper row is provided with test holes 21 to connect the signal line, and the lower row is provided with grounding holes 22 for grounding. In the coupled differential impedance bar, the upper row is provided with test holes 21 for routing the signal line, and the lower row is provided with grounding holes 22 for grounding.

[0039] The impedance strip has NPTH positioning holes at both ends, and the center distance between the two NPTH positioning holes is 5.47 inches.

[0040] The impedance bar has a fixed length of 5.6 inches and a width of 0.21 inches, and the signal line on the impedance bar is 4.2 inches long.

[0041] In practice, the impedance bars to be tested are installed on impedance bar test module 2 of the four test modules. The impedance tester is connected to the solder hole group to perform batch measurements on the impedance bars to be tested. When installing the impedance bars, pay attention to the layout requirements: when the impedance bars cannot be arranged in an x*y (x≥1, y≥1) array, arrange the excess impedance bars in another row, filling the blank spaces with copper foil. For example, when 7 impedance bars are automatically generated based on the board's internal impedance, arranging them in a 2*3 array will result in one extra bar (impedance bar 7). In this case, another row needs to be arranged, filling the blank spaces with copper foil. Figure 5 As shown;

[0042] The impedance strips can be arranged in a maximum of 3 rows in the y direction and a maximum of 3 or 4 groups in the x direction depending on the actual PNL length. If there are 3 groups in the x direction and the total number of impedance strips is greater than 9, or 4 groups in the x direction and the total number of impedance strips is greater than 12, the extra parts will be arranged in another group. The arrangement is restricted to facilitate the accommodation of multiple modules on the PCB board and ensure normal use.

[0043] The test time for impedance testing using this invention is reduced by 70% compared to conventional testing, while production capacity is increased by 80%.

[0044] In addition to the embodiments described above, this utility model may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by this utility model.

Claims

1. An automatic impedance measuring fixture, characterized in that: The PCB board body (1) is provided with four test modules on its surface. Each test module includes an impedance bar test module (2), a connecting line (3), and multiple solder hole groups (4). The solder hole groups (4) are connected to the impedance bar test module (2) through the connecting line (3). Each solder hole group (4) is composed of multiple individual solder holes, and the multiple individual solder holes form a square structure on the periphery. The impedance bar test module (2) includes multiple rows of test holes (21) and multiple rows of grounding holes (22) distributed at intervals, with a row of grounding holes (22) correspondingly arranged below each row of test holes (21). The impedance bar test module (2) of the four test modules is equipped with an impedance bar to be tested. The impedance tester is connected to the welding hole group (4) to perform batch measurement of the impedance bar to be tested.

2. The fully automatic impedance measuring fixture according to claim 1, characterized in that: The plurality of welding hole groups (4) are distributed in the semi-circular direction of the impedance bar test module (2).

3. The fully automatic impedance measuring fixture according to claim 1, characterized in that: Each of the weld hole groups (4) consists of five individual weld holes, with four evenly distributed weld holes forming a square structure, and a weld hole located in the middle of the four weld holes.

4. The fully automatic impedance measuring fixture according to claim 1, characterized in that: The impedance bar test module (2) is provided with three rows of test holes (21) and three rows of grounding holes (22), with 10 holes in each row.

5. The fully automatic impedance measuring fixture according to claim 1, characterized in that: The connecting wire (3) is a 50Ω wire.

6. The fully automatic impedance measuring fixture according to claim 1, characterized in that: The distance between any two adjacent modules in the four modules is 5.47 inches, and the distance between the edge of the module and the edge of the PCB body (1) in the vertical direction is 0.11 inches.

7. The fully automatic impedance measuring fixture according to claim 1, characterized in that: The impedance bar to be tested includes a single-ended impedance bar and a coupled differential impedance bar. In the single-ended impedance bar, the upper row is provided with test holes (21) to connect signal lines, and the lower row is provided with grounding holes (22) for grounding. In the coupled differential impedance bar, the upper row is provided with test holes (21) for wiring, and the lower row is provided with grounding holes (22) for grounding.

8. The fully automatic impedance measuring fixture according to claim 7, characterized in that: The impedance strip has NPTH positioning holes at both ends, and the center distance between the two NPTH positioning holes is 5.47 inches.

9. The fully automatic impedance measuring fixture according to claim 7, characterized in that: The impedance bar has a fixed length of 5.6 inches and a width of 0.21 inches, and the signal line on the impedance bar is 4.2 inches long.

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