Printed board for cable test and cable test fixture

Abstract

The invention relates to the technical field of electrical performance testing, in particular to a printed board for cable testing and a cable testing jig, the cable testing jig comprises the printed board for cable testing, the printed board for cable testing is provided with a shielding clamping groove, the shielding clamping groove is provided with an extending section for clamping an exposed section of a shielding layer of a cable in the extending direction of the extending section, and the extending section is provided with a clamping groove. The printed board is provided with signal contact conductors which are arranged at intervals with the shielding clamping grooves and used for tightly pressing the signal line exposed sections of the cables, the groove walls of the shielding clamping grooves are provided with shielding contact conductors which are used for contacting the shielding layer exposed sections, and the shielding clamping grooves in the printed board are used for clamping the shielding layer exposed sections of the cables for fixing and conducting contact. According to the utility model, the shielding layer exposed section of the cable does not need to be pressed tightly, and only the signal line exposed section of the cable needs to be pressed tightly, so that signal conduction is not influenced, operation is convenient, poor contact caused by operation deviation is not easy to occur, and the reliability of signal conduction and shielding conduction of the cable and the printed board is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical performance testing, and in particular to a printed circuit board for cable testing and a cable testing fixture. Background Art

[0002] As data transmission rates become faster and faster, the performance of cables used to transmit data also needs to be improved accordingly. In order to grasp the transmission performance of high-speed cable products, performance testing is usually required. Currently, cable test fixtures are used in conjunction with test instruments for testing. The cable test fixtures include printed circuit boards, connectors, support seats, and wire pressing mechanisms. Signal contact conductors and shielding contact conductors are arranged at intervals on the surface of the printed circuit board. The connector is installed on the printed circuit board and is electrically connected to the signal contact conductors and shielding contact conductors through the wiring on the surface of the printed circuit board. The connector is used to connect the test instrument. The wire pressing mechanism is installed on the support seat. The wire pressing mechanism has a pressure head for pressing the cable. When testing, the cable is stripped so that the cable has a signal line exposed section and a shielding layer exposed section. The printed board is placed on the support seat, and then the cable is placed on the printed board, and the signal line exposed section and the shielding layer exposed section of the cable correspond to the signal contact conductor and the shielding contact conductor on the printed board respectively. Then, the cable is pressed onto the printed board by the pressure head of the wire pressing mechanism, so that the signal line exposed section of the cable is in conductive contact with the signal contact conductor on the printed board, and the shielding layer exposed section of the cable is in conductive contact with the shielding contact conductor on the printed board. Then, the connector on the printed board is used to connect the test instrument for testing.

[0003] In order to make the exposed signal line section and the exposed shielding layer section of the cable reliably contact the corresponding conductors on the printed circuit board, the above-mentioned cable test fixture is used by pressing the pressure head of the wire pressing mechanism on the junction of the exposed signal line section and the exposed shielding layer section of the cable, so that both the exposed signal line section and the exposed shielding layer section can be pressed by the pressure head. However, such a pressure head has to press both the exposed signal line section and the exposed shielding layer section, which is easy to affect the pressing reliability of the pressure head due to the radial size difference between the exposed signal line section and the exposed shielding layer section and the position deviation of the cable placed on the printed circuit board during human operation, and thus it is easy to have poor contact. Summary of the invention

[0004] The object of the present invention is to provide a printed circuit board for cable testing, so as to solve the problem that the contact reliability of the current cable testing method in which a pressure head is pressed on the junction of the exposed signal line section and the exposed shielding layer section of the cable to achieve signal conduction and shielding conduction between the cable and the printed circuit board is easily affected by operation deviation; the object of the present invention is also to provide a cable testing fixture to solve the above-mentioned problem.

[0005] The technical solution of the cable testing printed board of the present invention is: A printed circuit board for cable testing is provided on the printed circuit board. The shielding slot has an extension section for clamping the exposed section of the shielding layer of the cable along its extension direction. A signal contact conductor for pressing the exposed section of the signal line of the cable is provided on the printed circuit board at intervals from the shielding slot. A shielding contact conductor for contacting the exposed section of the shielding layer is provided on the slot wall of the shielding slot.

[0006] Furthermore, the shielding slot penetrates in the thickness direction of the printed circuit board.

[0007] Furthermore, signal contact conductors are provided on both side surfaces of the printed circuit board for contacting two signal wires of the cable respectively.

[0008] Furthermore, two signal contact conductors are provided on the same side surface of the printed circuit board for contacting two signal wires of the cable respectively.

[0009] Furthermore, the shielding slot extends to the edge of the printed circuit board to form a side opening for avoiding when the exposed section of the shielding layer of the cable is inserted into the shielding slot.

[0010] Furthermore, the signal contact conductor is arranged on a side of the printed circuit board away from the side opening of the shielding slot.

[0011] Furthermore, an extension direction of the signal contact conductor is consistent with an extension direction of the shielding slot.

[0012] Furthermore, the shielding contact conductor is a metal plating layer.

[0013] Beneficial effects of the cable testing printed circuit board of the present invention: The present invention pioneers a cable testing printed circuit board that is convenient for ensuring reliable signal conduction and shielding conduction between the cable and the printed circuit board. By arranging a shielding slot on the printed circuit board, the exposed section of the shielding layer of the cable is clamped into the shielding slot along the length direction of the cable. The exposed section of the shielding layer of the cable can be fixed by clamping in the shielding slot and contacting with the shielding contact conductor in the shielding slot to achieve shielding conduction. After the exposed section of the shielding layer of the cable is clamped in the shielding slot, the exposed section of the signal line of the cable can be pressed and contacted by the signal contact conductor arranged at the interval position of the shielding slot on the printed circuit board to achieve signal conduction. In this way, the exposed section of the shielding layer of the cable is clamped and fixed and conductively contacted by the shielding slot on the printed circuit board. There is no need to consider clamping the exposed section of the shielding layer of the cable, and only the exposed section of the signal line of the cable needs to be pressed. Signal conduction is not affected, operation is convenient, and poor contact is not likely to occur due to operation deviation, which is conducive to ensuring the reliability of signal conduction and shielding conduction between the cable and the printed circuit board.

[0014] The technical solution of the cable test fixture of the present invention is: A cable testing fixture comprises a support seat and a printed circuit board, wherein the support seat is provided with a wire pressing mechanism, the printed circuit board is provided with a shielding slot, the shielding slot has an extension section for clamping an exposed shielding layer section of the cable along its extension direction, a signal contact conductor for the exposed signal line section of the cable to be pressed by the wire pressing mechanism is provided on the printed circuit board at intervals from the shielding slot, and a shielding contact conductor for contact with the exposed shielding layer section is provided on the slot wall of the shielding slot.

[0015] Furthermore, the shielding slot penetrates in the thickness direction of the printed circuit board.

[0016] Furthermore, signal contact conductors are provided on both side surfaces of the printed circuit board for contacting two signal wires of the cable respectively, and wire pressing mechanisms are provided on both sides of the support seat in the thickness direction of the printed circuit board.

[0017] Furthermore, the support base is provided with a mounting groove for the printed circuit board to be vertically mounted on the support base.

[0018] Furthermore, the support seat includes an upper portion and a lower portion spaced apart from each other, the mounting grooves are respectively provided on opposite sides of the upper portion and the lower portion, and the mounting grooves of the upper portion are arranged opposite to the mounting grooves of the lower portion, and a loading port for vertically loading a printed circuit board is provided on one side in the extension direction of the mounting grooves, and a space for exposing a shielding slot of the printed circuit board and a signal contact conductor is formed between the upper portion and the lower portion of the support seat.

[0019] Furthermore, two signal contact conductors are provided on the same side surface of the printed circuit board for contacting two signal wires of the cable respectively.

[0020] Furthermore, the shielding slot extends to the edge of the printed circuit board to form a side opening for avoiding when the exposed section of the shielding layer of the cable is inserted into the shielding slot.

[0021] Furthermore, the signal contact conductor is arranged on a side of the printed circuit board away from the side opening of the shielding slot.

[0022] Furthermore, an extension direction of the signal contact conductor is consistent with an extension direction of the shielding slot.

[0023] Furthermore, the shielding contact conductor is a metal plating layer.

[0024] The beneficial effects of the cable testing fixture of the present invention are as follows: the present invention is improved based on the cable testing fixture in the prior art, and provides a printed circuit board for cable testing that is convenient for ensuring reliable signal conduction and shielding conduction between the cable and the printed circuit board. By arranging a shielding slot on the printed circuit board, the exposed section of the shielding layer of the cable is inserted into the shielding slot along the length direction of the cable. The exposed section of the shielding layer of the cable can be fixed by clamping in the shielding slot and contacting with the shielding contact conductor in the shielding slot to achieve shielding conduction. After the exposed section of the shielding layer of the cable is clamped in the shielding slot, the exposed section of the signal line of the cable can be pressed and contacted by the signal contact conductor arranged at the interval position of the shielding slot on the printed circuit board to achieve signal conduction. In this way, the exposed section of the shielding layer of the cable is clamped and fixed and conductively contacted by the shielding slot on the printed circuit board. There is no need to consider pressing the exposed section of the shielding layer of the cable, and only the exposed section of the signal line of the cable needs to be pressed, which does not affect the signal conduction, is easy to operate, and is not prone to poor contact due to operation deviation, which is conducive to ensuring the reliability of signal conduction and shielding conduction between the cable and the printed circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a cable test fixture from one side perspective according to an embodiment of the present invention; Figure 2 is a schematic diagram of a cable test fixture from another side perspective according to an embodiment of the present invention; Figure 3 for Figure 1 Schematic diagram of the coordination between the cables and the printed circuit board; Figure 4 for Figure 2 Schematic diagram of the coordination between the cables and the printed circuit board; Figure 5 for Figure 3 Schematic diagram of the printed circuit board in; Figure 6 for Figure 3 Schematic diagram of the cross section of the cable.

[0026] In the figure: 10, cable; 11, exposed section of signal line; 12, exposed section of shielding layer; 13, first conductor; 14, second conductor; 20, printed circuit board; 21, first signal contact conductor; 22, shielding card slot; 23, second signal contact conductor; 30, connector; 40, support seat; 41, upper part; 42, side; 43, lower part; 50, wire pressing mechanism; 51, pressure head; 60, positioning pin. DETAILED DESCRIPTION

[0027] The cable test fixture of the present invention arranges a shielding slot on a printed circuit board so that the exposed section of the shielding layer of the cable is clamped in the shielding slot for fixing and contacting with the shielding contact conductor in the shielding slot to achieve shielding conduction, and the exposed section of the signal line of the cable is pressed and contacted with the corresponding signal contact conductor on the printed circuit board to achieve signal conduction. By fixing and contacting the exposed section of the shielding layer with the shielding slot, there is no need to consider pressing the exposed section of the shielding layer of the cable, and only needs to press the exposed section of the signal line of the cable, which does not affect the signal conduction operation and is not prone to poor contact due to operation deviation, which is beneficial to ensuring the reliability of signal conduction and shielding conduction between the cable and the printed circuit board.

[0028] Embodiment of the cable test fixture of the present invention: like Figure 1 As shown, the cable test fixture includes a printed board 20, a connector 30, a support seat 40 and a wire pressing mechanism 50, and the cable test fixture is used to cooperate with a corresponding test instrument to test the cable 10. The printed board 20 is limited by the support seat 40. When in use, the cable 10 is conductively connected to the printed board 20 and the wire pressing mechanism 50 installed on the support seat 40 presses the cable 10 on the printed board 20. The connector 30 is arranged on the printed board 20 for connecting the corresponding test instrument, so that the cable 10 is connected to the corresponding instrument through the printed board 20 and the connector 30.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, after the cable 10 is wired, a signal line exposed section 11 and a shielding layer exposed section 12 are formed. The signal line exposed section 11 extends to the front side of the shielding layer exposed section 12 along the extension direction of the cable 10. The extension direction of the cable 10 is its length direction. The printed circuit board 20 is provided with a signal contact conductor for conductively contacting the signal line exposed section 11 and a shielding contact conductor for conductively contacting the shielding layer exposed section 12.

[0030] In order to ensure reliable conductive contact between the printed circuit board 20 and the cable 10, a shielding slot 22 is provided on the printed circuit board 20. The shielding slot 22 is used for the exposed shielding layer section 12 of the cable 10 to be inserted. The shielding slot 22 can be used to clamp the exposed shielding layer section 12 of the cable 10. A shielding contact conductor is provided on the slot wall of the shielding slot 22. After the exposed shielding layer section 12 of the cable 10 is inserted into the shielding slot 22, it forms conductive contact with the shielding contact conductor. At the same time, the exposed shielding layer section 12 is fixed by the shielding slot 22 to keep the exposed shielding layer section 12 in contact with the shielding contact conductor. In this way, the exposed shielding layer section 12 of the cable 10 is clamped and conductively contacted by the shielding slot 22 on the printed circuit board 20. It is not necessary to consider pressing the exposed shielding layer section 12 of the cable 10. It is only necessary to press the exposed signal line section 11 of the cable 10. It is easy to operate and is not prone to poor contact due to operational deviation. It is beneficial to ensure the reliability of signal conduction and shielding conduction between the cable 10 and the printed circuit board 20.

[0031] A side opening is provided on one side of the shielding slot 22 in the extension direction. The shielding slot 22 extends to the edge of the printed circuit board so that the side opening is located at the edge of the printed circuit board 20. When the shielding layer exposed section 12 of the cable 10 is inserted into the shielding slot 22, the side opening can avoid the shielding layer exposed section 12 of the cable 10 to maintain the extension direction of the cable 10. The extension direction of the cable 10 is consistent with the extension direction of the shielding slot 22, which is convenient for cable installation operations. A signal contact conductor is provided on the printed circuit board 20 on the side of the shielding slot 22 away from the side opening. The signal contact conductor is located on the side of the shielding slot 22 away from the side opening in the extension direction, which is convenient for contact with the signal line exposed section 11 of the cable 10. The extension direction of the signal contact conductor is consistent with the extension direction of the shielding slot, which can maintain the extension direction of the signal line exposed section 11, which is convenient for wire pressing operations. The signal contact conductor and the shielding contact conductor in the shielding slot 22 are arranged at intervals along the extension direction of the shielding slot 22. When the shielding layer exposed section 12 of the cable 10 is inserted into the shielding slot 22, the signal line exposed section 11 of the cable 10 can be extended to the signal contact conductor on one side of the shielding slot 22. The signal line exposed section 11 of the cable 10 is pressed against the signal contact conductor by the wire pressing mechanism 50 to form a conductive contact. The part of the shielding slot 22 for the shielding layer exposed section 12 to be inserted constitutes an extension section for the shielding layer exposed section 12 to be inserted along its extension direction. After the shielding layer exposed section 12 is inserted into the shielding slot 22, the extension direction of the shielding layer exposed section 12 is the same as the extension direction of the extension section of the shielding slot 22 to ensure reliable fixation and contact.

[0032] The shielding slot 22 penetrates in the thickness direction of the printed circuit board 20, which is convenient for processing and manufacturing the shielding slot 22, and can fully utilize the thickness of the printed circuit board 20 to increase the contact area between the shielding slot 22 and the exposed section 12 of the shielding layer of the cable 10, which is conducive to reliable clamping and reliable conductive contact.

[0033] The cable 10 in this embodiment is a microstrip cable. Figure 6 As shown, the cable 10 has two signal lines, which are a first conductor 13 and a second conductor 14. The first conductor 13 and the second conductor 14 are arranged side by side so that the cable 10 is oblate. The width direction of the cable 10 is the parallel direction of the first conductor 13 and the second conductor 14, and the width direction of the cable 10 is perpendicular to the thickness direction. When installing the cable 10, the cable 10 can be inserted into the shielding slot 22 from the side opening of the shielding slot 22 located at the edge of the printed circuit board 20, and the middle part of the cable 10 in the width direction is correspondingly inserted into the shielding slot 22 until the front end of the shielding layer exposed section 12 of the cable 10 hits the side wall of the shielding slot 22 away from the side opening to limit the cable 10. At this time, the shielding layer of the cable 10 is located on the two side surfaces in the thickness direction of the shielding layer exposed section 12, which are respectively in close contact with the opposite side groove walls of the shielding slot 22, and the opposite side groove walls of the shielding slot 22 are provided with shielding contact conductors to ensure reliable shielding conduction; the first conductor 13 and the second conductor 14 of the cable 10 are located in the signal line exposed section 11, which extend to both sides of the thickness direction of the printed circuit board 20 and are on one side of the shielding slot 22 without contacting the shielding contact conductor. In order to facilitate the first wire 13 and the second wire 14 extending to both sides of the printed circuit board 20 in the thickness direction to form signal conduction with the printed circuit board 20, signal contact conductors are provided on both sides of the printed circuit board 20 to contact the two signal wires of the cable 10 respectively, that is, a first signal contact conductor 21 is provided on one side of the printed circuit board 20 to make conductive contact with the first wire 13, and a second signal contact conductor 23 is provided on the other side to make conductive contact with the second wire 14, so as to adapt to the wire position.

[0034] The support base 40 is provided with a wire pressing mechanism 50 on both sides of the printed circuit board 20 in the thickness direction, wherein the wire pressing mechanism 50 on one side is used to press the portion of the first wire 13 located in the signal wire exposed section 11 onto the first signal contact conductor 21, and the wire pressing mechanism 50 on the other side is used to press the portion of the second wire 14 located in the signal wire exposed section 11 onto the second signal contact conductor 23. The two wire pressing mechanisms 50 are symmetrically arranged on both sides of the printed circuit board 20, which is conducive to reliable signal conduction and uniform force.

[0035] The printed circuit board 20 is vertically mounted on the support seat 40, and the thickness direction of the printed circuit board 20 is perpendicular to the up-down direction. The support seat 40 is provided with a mounting groove for the printed circuit board 20 to be vertically mounted on the support seat 40, so that the printed circuit board 20 is vertically arranged, and it is convenient to observe the position where the wire pressing mechanism 50 presses the wire. The wire pressing mechanism 50 can adopt a quick clamp, which is a mature product and will not be described here. The wire pressing mechanism 50 has a pressing head 51 pressed on the wire, and the pressing head 51 is a block body, and a low-loss plastic material can be adopted.

[0036] The support seat 40 includes an upper portion 41 and a lower portion 43 and a side portion 42 which are spaced apart from each other. The same end of the upper portion 41 and the lower portion 43 are connected through the side portion 42 and the other end is spaced apart. Two wire pressing mechanisms 50 are installed on the upper portion 41 for easy operation. Mounting grooves are respectively provided on the opposite sides of the upper portion 41 and the lower portion 43 of the support seat 40, and the notches of the mounting grooves of the upper portion 41 and the mounting grooves of the lower portion 43 are arranged opposite to each other. A loading port for vertical loading of the printed board 20 is provided on the side facing away from the side portion 42 in the extending direction of the mounting grooves. The mounting grooves of the upper portion 41 and the mounting grooves of the lower portion 43 limit the upper and lower edges of the printed board 20 respectively. The space between the upper portion 41 and the lower portion 43 of the support seat 40 can expose the shielding slot 22, the signal contact conductor and the connector 30 of the printed board 20, so as to facilitate the wire pressing operation and the connector 30 plugging operation. The upper portion 41 of the support seat 40 is provided with a boss protruding downward, and the lower portion 43 is provided with a boss protruding upward. The boss of the upper portion 41 and the boss of the lower portion 43 are respectively located on both sides of the printed circuit board 20. Positioning holes are provided on the bosses, and matching holes are provided on the printed circuit board 20. After the printed circuit board 20 is inserted into the support seat 40, the positioning and fixation of the printed circuit board 20 can be achieved by respectively installing positioning pins 60 on the boss of the upper portion 41 and the boss of the lower portion 43 of the support seat 40.

[0037] Connectors 30 are respectively arranged on the two sides of the printed board 20 to electrically connect the two wires through the wiring metal on the printed board 20. The connectors 30 can be SMA radio frequency connectors 30. The vertically arranged printed board 20 also facilitates the connection operation between the connectors 30 on both sides and the corresponding test instruments. The connectors 30 on both sides are staggered on the printed board 20 to facilitate the arrangement of two connectors 30 on the printed board 20. The first signal contact conductor 21 and the second signal contact conductor 23 are surface wiring metals arranged on the printed board 20, and the shielding contact conductor is a metal plating layer, which is easy to manufacture.

[0038] In other embodiments, when the thickness of the printed circuit board is sufficient, the shielding slot may not be a through slot that passes through the thickness direction of the printed circuit board. The shielding slot has a slot bottom facing one side in the thickness direction of the printed circuit board. At this time, the first signal contact conductor and the second signal contact conductor are both arranged on the same side surface of the printed circuit board, and the two connectors are also arranged on the same side surface of the printed circuit board, and only one wire pressing mechanism is required.

[0039] In other embodiments, the first signal contact conductor and the second signal contact conductor may also be disposed on the same side surface of the printed circuit board. In this case, a through hole needs to be disposed on the printed circuit board so that one of the conductors passes through the through hole from one side of the printed circuit board and goes around to the other side, thereby forming a conductive contact with the other conductor on the same side surface of the printed circuit board.

[0040] In other embodiments, the support seat can also be a support seat for placing a printed circuit board flatly, and the support seat is provided with an upward supporting boss, and only one wire pressing mechanism is provided. After the printed circuit board is placed on the support seat, the supporting boss is supported on the portion of the second conductor located in the exposed section of the signal line, and the portion of the first conductor located in the exposed section of the signal line is pressed by the wire pressing mechanism.

[0041] In other implementations, the support seat may not be provided with an upper portion, and in this case the wire pressing mechanism is installed on the side portion.

[0042] In other implementations, the shielding contact conductor may also be fixed to a metal sheet on the slot wall of the shielding slot.

[0043] In other implementations, the shielding slot may also be a groove without a side opening, so that the exposed section of the shielding layer is bent and inserted into the shielding slot, and the exposed section of the shielding layer extends along the extension direction of the shielding slot.

[0044] In other implementations, the signal contact conductor is disposed on one side of the shielding slot in the slot width direction of the printed circuit board, so that the wire has a sufficient length to contact the signal contact conductor.

[0045] In other implementations, the extension direction of the signal contact conductor and the extension direction of the shielding slot may also be arranged to form an angle.

[0046] Embodiment of the cable testing printed board of the present invention: The cable test printed circuit board in this embodiment is the same as the printed circuit board in the above-mentioned cable test fixture embodiment, and will not be described in detail here.

[0047] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A printed circuit board for cable testing, characterized in that: The printed circuit board (20) is provided with a shielding slot (22), the shielding slot (22) having an extension section for clamping the shielding layer exposed section (12) of the cable (10) along its extension direction, a signal contact conductor for pressing the signal line exposed section (11) of the cable (10) is provided on the printed circuit board (20) at intervals from the shielding slot (22), and a shielding contact conductor for contacting the shielding layer exposed section (12) is provided on the slot wall of the shielding slot (22).

2. The cable testing printed circuit board according to claim 1, characterized in that: The shielding slot (22) penetrates the printed circuit board (20) in the thickness direction.

3. The cable testing printed circuit board according to claim 2, characterized in that: Signal contact conductors are provided on both side surfaces of the printed circuit board (20) for contacting two signal lines of the cable (10) respectively.

4. The cable testing printed circuit board according to claim 1, characterized in that: Two signal contact conductors are provided on the same side surface of the printed circuit board (20) for contacting two signal lines of the cable (10) respectively.

5. The cable testing printed circuit board according to any one of claims 1 to 4, characterized in that: The shielding slot (22) extends to the edge of the printed circuit board to form a side opening for avoiding when the shielding layer exposed section (12) of the cable (10) is inserted into the shielding slot (22).

6. The cable testing printed circuit board according to claim 5, characterized in that: The signal contact conductor is arranged on a side of the printed circuit board (20) away from the side opening of the shielding slot (22).

7. The cable testing printed circuit board according to any one of claims 1 to 4, characterized in that: The extension direction of the signal contact conductor is consistent with the extension direction of the shielding card slot (22).

8. The cable testing printed circuit board according to any one of claims 1 to 4, characterized in that: The shield contact conductor is metal-plated.

9. A cable testing fixture, comprising a support base (40) and a printed circuit board (20), wherein a wire pressing mechanism (50) is provided on the support base (40), wherein: A shielding slot (22) is provided on the printed circuit board (20), the shielding slot (22) having an extension section for clamping the shielding layer exposed section (12) of the cable (10) along its extension direction, a signal contact conductor for pressing the signal line exposed section (11) of the cable (10) through a wire pressing mechanism (50) is provided on the printed circuit board (20) at intervals from the shielding slot (22), and a shielding contact conductor for contact with the shielding layer exposed section (12) is provided on the slot wall of the shielding slot (22).

10. The cable testing fixture according to claim 9, characterized in that: The shielding slot (22) penetrates the printed circuit board (20) in the thickness direction.

11. The cable testing fixture according to claim 10, characterized in that: Signal contact conductors are provided on both side surfaces of the printed circuit board (20) for contacting two signal wires of the cable (10) respectively, and a wire pressing mechanism (50) is provided on both sides of the support seat (40) in the thickness direction of the printed circuit board (20).

12. The cable testing fixture according to claim 11, characterized in that: The support seat (40) is provided with a mounting groove for the printed circuit board (20) to be vertically mounted on the support seat (40).

13. The cable testing fixture according to claim 12, characterized in that: The support seat (40) comprises an upper portion (41) and a lower portion (43) spaced apart from each other, the upper portion (41) and the lower portion (43) are provided with the mounting grooves on opposite sides thereof, and the mounting groove of the upper portion (41) and the mounting groove of the lower portion (43) are arranged opposite to each other, and a loading port for vertically loading a printed circuit board (20) is provided on one side in the extension direction of the mounting groove, and a space for exposing a shielding slot (22) of the printed circuit board (20) and a signal contact conductor is formed between the upper portion (41) and the lower portion (43) of the support seat (40).

14. The cable testing fixture according to claim 9, characterized in that: Two signal contact conductors are provided on the same side surface of the printed circuit board (20) for contacting two signal lines of the cable (10) respectively.

15. The cable testing fixture according to any one of claims 9 to 14, characterized in that: The shielding slot (22) extends to the edge of the printed circuit board to form a side opening for avoiding when the shielding layer exposed section (12) of the cable (10) is inserted into the shielding slot (22).

16. The cable testing fixture according to claim 15, characterized in that: The signal contact conductor is arranged on a side of the printed circuit board (20) away from the side opening of the shielding slot (22).

17. The cable testing fixture according to any one of claims 9 to 14, characterized in that: The extension direction of the signal contact conductor is consistent with the extension direction of the shielding card slot (22).

18. The cable testing fixture according to any one of claims 9 to 14, characterized in that: The shield contact conductor is metal-plated.

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