A differential line test fixture

Abstract

The present invention discloses a differential line test fixture, and relates to the technical field of differential line test fixture production, including a test base plate, and also including a test base, the test base plate is arranged on the test base plate, a port connector and a fixing clip are arranged on the test base, the port connector is connected to the test equipment, the port connector and the fixing clip are both fixedly connected to the test base, the number of the test base is at least two, and both ends of the differential line are connected to the port connector through the fixing clip. The differential line test fixture provided by the present invention can improve the signal stability during the test process, and reduce the signal insertion loss during the test process. At the same time, the differential line is fixed in the test base by the fixing clip, which can prevent the end of the differential line from shaking during the test process, resulting in inaccurate test data. After the test base is used for testing, the test result can be made more accurate, and the test signal is more stable, so that the test data has a certain reliability, thereby improving the test efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of differential line test fixture production, and in particular to a differential line test fixture. Background Art

[0002] The differential line test fixture is a device used to connect the differential signal test system with the differential line to be tested. It can transmit the differential signal from the test system to the differential line to be tested, and receive the differential signal from the differential line to be tested, thereby realizing the test of the differential line performance.

[0003] According to the invention patent application with publication number: CN113904968A and publication date of 2022-01-07, a test tool and test equipment are disclosed, the test tool includes a PCB test board, the PCB test board is provided with multiple electrical port connectors and multiple differential strip lines, multiple differential strip lines are electrically connected to multiple electrical port connectors, and any differential strip line is used to simulate the twisted pair core wires in the network cable. Its main technical effects are: it can not only reduce the space pressure brought to the production line test workshop by the 100-meter network cable, but also save the cost of using the 100-meter network cable for testing; at the same time, the use of the PCB test board can optimize the operability of the production line testers. During the test, the test tool can be connected one-to-one with the equipment to be tested, and stacked in the corresponding test cabinet. One test cabinet can complete the test of multiple groups of equipment to be tested, thereby improving the test efficiency.

[0004] In the prior art, a PCB board is used for differential line testing, and a coaxial connector is vertically mounted and assembled for testing. When such a PCB board is used to test the differential line, strict requirements are placed on the matching of the wiring mechanism inside the PCB board and the vertically mounted coaxial connector, resulting in the data collected by the PCB board test being not accurate enough, and the signal frequency that can be detected by the PCB board test being very limited. Therefore, a differential line test fixture is proposed, aiming to solve the problems of inaccurate collected data and limited test frequency in the prior art of PCB board differential line testing. Summary of the invention

[0005] The purpose of the present invention is to provide a differential line test fixture, aiming to solve the problems of insufficient accuracy of collected data and limited test frequency in differential line testing of PCB boards in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A differential line test fixture comprises a test base plate and a test pedestal, wherein the test pedestal is arranged on the test base plate, and a port connector and a fixing clip are provided on the test pedestal, wherein the port connector is connected to a test device, and the port connector and the fixing clip are both fixedly connected to the test base, and the number of the test bases is at least two, and both ends of the differential line are connected to the port connector via the fixing clips.

[0007] Preferably, the port connector includes a fixed flange, a first center pin, a second center pin, a connecting body, a tail pipe, a positioning body and a positioning insulator, the fixed flange is fixedly connected to the test base, the first center pin is connected to the connecting body, the tail pipe is connected to the fixed flange, the positioning body is connected to the tail pipe, the second center pin is connected to the tail pipe, the first center pin and the second center pin remain plugged in, and the positioning insulator is connected to the inside of the positioning body.

[0008] Preferably, a positioning groove is provided on the test base, and the fixing clip is fixedly connected in the positioning groove. The fixing clip includes an upper clamp body and a lower clamp body, and a clamping groove is provided on the upper clamp body and the lower clamp body. The port connector passes through the test base, and one end of the port connector on the other side of the test base is located in the clamping groove.

[0009] Preferably, it also includes a guide assembly, which includes a guide seat, a fixing plate and a locking plate, the test seat is provided with a first guide groove, the guide seat is embedded in the first guide groove, the locking plate is provided with a fastening groove, the locking plate is fixedly connected to the test seat, the fixing plate is embedded in the fastening groove, and the guide seat is provided with a second guide groove.

[0010] Preferably, the port connector also includes a first insulator and a second insulator, the first insulator is connected to the outside of the first center pin, the first center pin is connected to one end of the connecting body through the first insulator, and one end of the first center pin is located inside the fixing flange, the second insulator is connected to the outside of the second center pin, and the second center pin is connected to the positioning body through the second insulator.

[0011] Preferably, the test base is provided with mounting surfaces, the number of the mounting surfaces matches the port connectors, the port connectors are vertically mounted on the mounting surfaces, and the port connectors penetrate the mounting surfaces.

[0012] In the above technical solution, the differential line test fixture provided by the present invention has the following beneficial effects: In this invention, both ends of the differential line to be tested can be connected to the test base respectively, and the end of the differential line can be connected to the port connector through the fixing clip on the test base, and the port connector is connected to the test equipment, so that the differential line can be connected to the test equipment, and the differential line is connected to the test equipment through the port connector and the fixing clip arranged inside the test base, which can improve the signal stability during the test and reduce the signal insertion loss during the test. At the same time, the differential line is fixed in the test base by the fixing clip, which can prevent the end of the differential line from shaking during the test and causing inaccurate test data. After testing with the test base, the test results can be more accurate and the test signal can be more stable, so that the test data has a certain reliability, thereby improving the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0014] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2 A schematic diagram of the three-dimensional structure of a test base provided in an embodiment of the present invention; Figure 3 A schematic plan cross-sectional view of a port connector provided by an embodiment of the present invention; Figure 4 A schematic diagram of the port connector assembly structure provided by an embodiment of the present invention; Figure 5 A schematic diagram of the test base assembly structure provided by an embodiment of the present invention; Figure 6 A schematic diagram of the return loss test results using a test base provided in an embodiment of the present invention; Figure 7 A schematic diagram of impedance test results using a test base provided in an embodiment of the present invention; Figure 8 A schematic diagram of transmission loss test results using a test base provided in an embodiment of the present invention; Fig. 9 A schematic diagram of the connection relationship of the port connectors provided in an embodiment of the present invention; Fig.10 A schematic diagram of return loss test results of each channel S11, S22, S33, and S44 provided in an embodiment of the present invention; Fig.11 A schematic diagram of the connection relationship of the positioning grooves provided in an embodiment of the present invention; Fig.12 A schematic diagram of a loss test result of a differential signal from channel 1 to channel 2 provided in an embodiment of the present invention; Fig.13 A schematic diagram of a strength test result of converting a differential signal from channel 1 to channel 2 into a common mode signal provided in an embodiment of the present invention; Fig.14 A schematic diagram of a test result of the ratio of the common mode signal input to port 2 and reflected back provided in an embodiment of the present invention; Fig.15 A schematic diagram of a test result of the strength ratio of the common-mode reflection signal at port 2 relative to the differential-to-common-mode signal provided in an embodiment of the present invention; Fig.16 A schematic diagram of a test result of the ratio of the reflected differential signal input to port 1 provided in an embodiment of the present invention.

[0015] Description of reference numerals: 1. Test base plate; 2. Test base; 21. Port connector; 211. Fixed flange; 212. First center pin; 213. Second center pin; 214. Connecting body; 215. Tail pipe; 216. Positioning body; 2161. First chamfered surface; 217. Positioning insulator; 2171. Second chamfered surface; 218. First insulator; 219. Second insulator; 22. Fixing clamp; 221. Upper clamp body; 222. Lower clamp body; 223. Clamping groove; 23. Positioning groove; 24. First guide groove; 25. Mounting surface; 3. Guide assembly; 31. Guide seat; 32. Fixing plate; 33. Locking plate; 34. Fastening groove; 35. Second guide groove; 36. Fastening groove; 37. Fastening screw. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0017] See also Figure 1 — Fig.11 A differential line test fixture includes a test base plate 1 and a test base 2. The test base 2 is arranged on the test base plate 1. A port connector 21 and a fixing clip 22 are provided on the test base 2. The port connector 21 is connected to the test equipment. The port connector 21 and the fixing clip 22 are fixedly connected to the test base 2. There are at least two test bases 2. Both ends of the differential line are connected to the port connector 21 through the fixing clip 22.

[0018] Specifically, the test base plate 1 is a plate structure, the test base 2 is fixedly connected to the test base plate 1 by screws, and the number of the test bases 2 is at least two. As an embodiment provided by the present invention, the number of the test bases 2 is two, and the two test bases 2 are fixedly connected to the test base plate 1 by screws, and the two test bases 2 are symmetrically arranged on the test base plate 1.

[0019] A port connector 21 and a fixing clamp 22 are provided on the test base 2. One end of the port connector 21 can be connected to the test equipment, and the differential line can be connected inside the fixing clamp 22 to fix the differential line in the test base 2 to prevent the differential line from shaking. At the same time, the end of the port connector 21 away from the test equipment can be connected to the differential line, thereby connecting the differential line to the test equipment. While ensuring the connection, the signal can be transmitted stably, the volatility of the test data can be reduced, and the accuracy of the test data can be improved.

[0020] In this invention, both ends of the differential line to be tested can be connected to the test base 2 respectively, and the end of the differential line is connected to the port connector 21 through the fixing clip 22 on the test base 2, and the port connector 21 is connected to the test equipment, so that the differential line can be connected to the test equipment. The differential line is connected to the test equipment through the port connector 21 and the fixing clip 22 arranged inside the test base 2, which can improve the signal stability during the test and reduce the signal insertion loss during the test. At the same time, the differential line is fixed in the test base 2 by the fixing clip 22, which can prevent the end of the differential line from shaking during the test and causing inaccurate test data. After testing with the test base 2, the test result can be more accurate and the test signal can be more stable, so that the test data has a certain reliability, thereby improving the test efficiency.

[0021] As an embodiment provided by the present invention, Figure 4As shown, the port connector 21 includes a fixing flange 211, a first center pin 212, a second center pin 213, a connecting body 214, a tail pipe 215, a positioning body 216 and a positioning insulator 217. Specifically, a thread is provided at the end of the tail pipe 215, and the tail pipe 215 is fixedly connected to the connecting body 214 through the thread provided at the end. A limiting step is provided on the circumferential outer wall of the connecting body 214, and the connecting body 214 is connected between the fixing flange 211 and the tail pipe 215 through the limiting step on the outer wall, and one end of the connecting body 214 passes through the tail pipe 215, the first center pin 212 is connected to the end of the connecting body 214, and a limiting step is also provided on the circumferential outer wall of the positioning body 216. A bayonet is provided at the end of the connecting body 214, and one end of the positioning body 216 can be plugged with the bayonet provided at the end of the connecting body 214. The second center pin 213 is connected to the end of the positioning body 216, and one end of the second center pin 213 is plugged into one end of the first center pin 212. The positioning insulator 217 is fixedly connected to one end of the positioning body 216 located outside the tail pipe 215 , and the positioning insulator 217 is plugged with the end of the second center needle 213 .

[0022] As a further embodiment provided by the present invention, Figure 3 As shown, the port connector 21 also includes a first insulator 218 and a second insulator 219. Specifically, the first insulator 218 is fixedly installed on the outer wall of the first center needle 212, and the second insulator 219 is fixedly connected to the outer wall of the second center needle 213. A first groove is fixedly opened on one end of the connecting body 214, and the first insulator 218 is embedded in the first groove. One end of the first center needle 212 passes through and extends to the end of the fixing flange 211 away from the tail tube 215, so as to maintain connection with the signal line through the fixing flange 211. A second groove is provided at the end of the positioning body 216, and the second insulator 219 is embedded in the second groove. One end of the second center needle 213 is plugged with the first center needle 212, and the other end of the second center needle 213 is plugged with the positioning insulator 217.

[0023] Preferably, the diameters of the first center needle 212 and the second center needle 213 are smaller than the diameters of the fixing flange 211, the connecting body 214, the positioning body 216 and the tail tube 215, so that the first center needle 212 and the second center needle 213 are only installed inside the fixing flange 211, the connecting body 214, the positioning body 216 and the tail tube 215 through the first insulator 218 and the second insulator 219, thereby ensuring the stability of signal transmission.

[0024] When the port connector 21 is assembled, the first insulator 218 is sleeved onto the first center pin 212, and the second insulator 219 is sleeved onto the second center pin 213. Then, the first center pin 212 is inserted into the connection body 214, so that the first insulator 218 is embedded in the first groove. The connection body 214 is inserted into the fixing flange 211, so that one end of the first center pin 212 is located inside the fixing flange 211, which is convenient for connection with the test equipment. The tail pipe 215 is threadedly connected to one end of the fixing flange 211. Pass one end of the connecting body 214 through the tail tube 215, then insert the second center needle 213 into the positioning body 216, so that the second insulator 219 outside the second center needle 213 is embedded in the second groove of the positioning body 216, then insert one end of the positioning body 216 into the connecting body 214, so that the second center needle 213 and the first center needle 212 remain plugged in, and finally insert the positioning insulator 217 into the positioning body 216, so that the first beveled surface 2161 and the second beveled surface 2171 remain aligned to complete the assembly.

[0025] like Fig. 9 As shown, a connector mounting hole is opened on the outer wall of the test base 2, and the port connector 21 is fixedly mounted on the test base 2 through a fixing flange 211 and bolts, and one end of the port connector 21 passes through and extends to the outside of the connector mounting hole.

[0026] As a further embodiment provided by the present invention, the test base 2 is in an "L"-shaped structure as a whole, and a positioning groove 23 is provided on the outer wall of one side of the test base 2, and a fixing clip 22 is fixedly connected inside the positioning groove 23. The fixing clip 22 specifically includes an upper clamp body 221 and a lower clamp body 222. Specifically, countersunk holes are provided on the upper clamp body 221 and the lower clamp body 222, and the upper clamp body 221 and the lower clamp body 222 are fixed to the test base 2 by bolts. A clamping groove 223 is provided on the outer wall of one side of the upper clamp body 221 and the lower clamp body 222, and one end of the port connector 21 located outside the connector mounting hole is located inside the clamping groove 223, that is, the one end of the port connector 21 located outside the connector mounting hole is auxiliaryly fixed by the clamping groove 223 on the upper clamp body 221 and the lower clamp body 222, ensuring that during the test process, the one end of the port connector 21 located outside the connector mounting hole will not shake, so as to improve the stability of signal transmission.

[0027] As a further embodiment provided by the present invention, it also includes a guide component 3, which specifically includes a guide seat 31, a fixing plate 32 and a locking plate 33. A first guide groove 24 is opened on the outer wall of the "L"-shaped structure of the test base 2, and the width of the guide seat 31 is adapted to the width of the first guide groove 24, so that the guide seat 31 can be embedded in the first guide groove 24. A second guide groove 35 is opened on the outer wall at the top of the guide seat 31, and a fastening groove 34 is opened on the outer wall at the bottom of the locking plate 33. The width of the fastening groove 34 is adapted to the width of the fixing plate 32, so that after the locking plate 33 is installed on the test base 2, the top of the fixing plate 32 can be embedded in the fastening groove 34.

[0028] As a further embodiment provided by the present invention, a fixing groove 36 is opened on the outer wall of the locking plate 33. Specifically, the fixing groove 36 is a U-shaped groove with a step. A fastening screw 37 is threadedly connected to the test base 2. The screw portion of the fastening screw 37 is located inside the fixing groove 36, so that the locking plate 33 can be fixed or movable by tightening or loosening the fastening screw 37.

[0029] As another embodiment provided by the present invention, Figure 2 As shown, a mounting surface 25 is provided on the outer wall of the test base 2, and the number of the mounting surfaces 25 matches the number of the port connectors 21. Specifically, the number of the mounting surfaces 25 is two, and the two mounting surfaces 25 are symmetrically arranged. Preferably, the angle between the two mounting surfaces 25 is 15°-60°. Furthermore, the port connector 21 installed on the mounting surface 25 is installed perpendicular to the mounting surface 25.

[0030] A first bevel 2161 is provided at the end of the positioning body 216, and a second bevel 2171 is provided at the end of the positioning insulator 217. The first bevel 2161 is matched with the second bevel 2171. Since there is a certain angle between the two mounting surfaces 25 and the port connector 21 is installed perpendicular to the mounting surface, the second bevel 2171 and the first bevel 2161 are respectively provided on the positioning insulator 217 and the positioning body 216, so that one end of the differential line can be connected to the two port connectors 21 respectively.

[0031] During assembly, firstly place the lower clamp body 222 into the positioning groove 23, then install the two port connectors 21, and finally fix the upper clamp body 221 into the positioning groove 23 together with the lower clamp body 222 by bolts.

[0032] Working principle: Before testing the differential line, both ends of the differential line need to be stripped; Then, the locking plate 33 and the fixing plate 32 of the guide assembly 3 on the test base 2 are removed, and one end of the stripped differential line is embedded into the second guide groove 35, and the two wires at one end of the stripped differential line are respectively inserted into the two port connectors 21, that is, they are kept connected with the second center pin 213; After insertion, re-fix the locking plate 33 and the fixing plate 32, and fix the locking plate 33 and the fixing plate 32 by rotating the fastening screws 37 to fix the differential line in the test base 2 to prevent shaking during the test; Then repeat the operation on the other end of the differential line, and connect the two ends of the differential line to the two test bases 2 respectively. After completion, the port connector 21 can be connected to the test equipment through the connecting line to complete the test.

[0033] During the differential line test, the indicators for evaluating the performance of the differential line include return loss, impedance matching, signal reflection loss, signal attenuation during transmission, common mode signal suppression capability and conversion characteristics. Among them, the S11, S22, S33, and S44 parameters are used to evaluate return loss, the Sdd11 and Sdd22 parameters are used to evaluate impedance matching and signal reflection loss, the Sdd21 parameter is used to evaluate signal attenuation during transmission, the Scd21 parameter is used to evaluate common mode signal suppression capability and conversion characteristics, the TDD11 and TDD12 parameters are used to evaluate impedance matching, and the SDD12 is used to evaluate signal attenuation during transmission.

[0034] like Fig.10 As shown in the figure, the meaning of Scd21 / Sdd21 is: this ratio can reflect the relative relationship between the common-mode signal generated and the differential signal actually transmitted during the differential signal transmission process. If the value of Scd21 / Sdd21 is large, it means that there are relatively more conversions from differential signals to common-mode signals, which may mean that the symmetry and balance of the transmission line are poor, there are large electromagnetic coupling problems or line pair delay differences, etc., which will lead to the amplitude attenuation of the differential signal, the reflection of the common-mode signal converted back to the differential signal causing distortion, etc.; if the ratio is small, it means that there are fewer conversions from differential signals to common-mode signals, the differential transmission performance of the transmission line is relatively good, and the signal integrity and stability are higher. Scc22 represents the reflection or transmission characteristics of the common-mode signal at port 2.

[0035] See also Figure 6 — Figure 7 , are some test results after the differential lines are tested using the test base 2 provided by the present invention.

[0036] Figure 7This is a result diagram of the impedance test of the test base 2 provided by the present invention. It is difficult to accurately control the impedance value during the transition from 100Ω to 90Ω in the traditional PCB test tooling in the prior art. After adopting the fixture provided in the embodiment, the process of impedance transition from 100Ω to 90Ω can be accurately controlled.

[0037] Figure 8 The result diagram of the transmission loss test of the test base 2 provided by the present invention shows that the traditional PCB test fixture in the prior art has very large loss fluctuations during transmission and poor signal stability, which makes the test results of high-speed differential lines less accurate, and the test repeatability is very poor during large-scale testing, resulting in large deviations in each test result and inaccurate test data. After using the test fixture provided by this embodiment, the loss fluctuation during transmission is smaller and the signal is more stable, which improves the accuracy of the transmission loss test of the differential line test results. When conducting large-scale testing, the test repeatability is good and the data is more accurate.

[0038] Figure 6 The result diagram of the return loss test of the test base 2 provided by the present invention shows that when the PCB test fixture of the prior art is used, the return loss value is large, the signal reflection is large, and the matching of the surface test fixture port is poor, which has a great impact on the integrity and stability of signal transmission. However, after using the fixture provided by the embodiment of the present invention, when testing, the return loss value is small, the signal reflection is small, and the port matching of the test fixture is good, which will not have a great impact on the integrity and stability of signal transmission.

[0039] like Fig.10 As shown, after the return loss test is performed using the test base 2 provided by the present invention, the return loss is 10.58dB, which is significantly lower than the PCB test tooling used in the prior art, indicating that after adopting the test base provided by the present invention, the reflection loss in the signal transmission process is smaller, thereby improving the accuracy of the test.

[0040] After using the test base 2 provided by the present invention to perform an insertion loss test, it is found that the insertion loss curve is smooth and has no obvious resonance point. The test results of the present invention obtain 0Ghz-110Ghz, such as Figure 6 , Figure 7 and Figure 8 As shown, some data tests were close to 110Ghz, such as Fig.10 As shown, the test obtained 50Ghz data. It shows that within a wide frequency range. The test base 2 provided by the present invention can maintain stable test performance and avoid test errors caused by resonance. In addition, except for the absence of resonance points, the insertion loss value is lower than that of the PCB test fixture used in the prior art, which further proves that the present invention is more efficient in the signal transmission process than the PCB test fixture used in the prior art, and can improve the accuracy of the test results.

[0041] Those skilled in the art will appreciate that other similar connection methods may also be used to implement the present invention, such as welding, bonding or screwing.

[0042] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A differential line test fixture, comprising a test base plate (1), characterized in that: The test base (2) is also included. The test base (2) is arranged on the test base plate (1). A port connector (21) and a fixing clamp (22) are provided on the test base (2). The port connector (21) is connected to the test equipment. Both the port connector (21) and the fixing clamp (22) are fixedly connected to the test base (2). The number of the test bases (2) is at least two. Both ends of the differential line are connected to the port connector (21) via the fixing clamp (22).

2. A differential line test fixture according to claim 1, characterized in that: The port connector (21) comprises a fixing flange (211), a first center pin (212), a second center pin (213), a connecting body (214), a tail pipe (215), a positioning body (216) and a positioning insulator (217); the fixing flange (211) is fixedly connected to the test base (2); the first center pin (212) is connected to the connecting body (214); the tail pipe (215) is connected to the fixing flange (211); the positioning body (216) is connected to the tail pipe (215); the second center pin (213) is connected to the tail pipe (215); the first center pin (212) and the second center pin (213) are kept plugged together; and the positioning insulator (217) is connected to the inside of the positioning body (216).

3. A differential line test fixture according to claim 1, characterized in that: The test base (2) is provided with a positioning groove (23), the fixing clamp (22) is fixedly connected in the positioning groove (23), the fixing clamp (22) comprises an upper clamp body (221) and a lower clamp body (222), the upper clamp body (221) and the lower clamp body (222) are both provided with a clamping groove (223), the port connector (21) passes through the test base (2), and one end of the port connector (21) located on the other side of the test base (2) is located in the clamping groove (223).

4. A differential line test fixture according to claim 1, characterized in that: The test base (2) further comprises a guide assembly (3), the guide assembly (3) comprising a guide seat (31), a fixing plate (32) and a locking plate (33); a first guide groove (24) is provided on the test base (2); the guide seat (31) is embedded in the first guide groove (24); a fastening groove (34) is provided on the locking plate (33); the locking plate (33) is fixedly connected to the test base (2); the fixing plate (32) is embedded in the fastening groove (34); and a second guide groove (35) is provided on the guide base (31).

5. The differential line test fixture according to claim 2, characterized in that: The port connector (21) also includes a first insulator (218) and a second insulator (219), wherein the first insulator (218) is connected to the outside of the first center needle (212), the first center needle (212) is connected to one end of the connecting body (214) through the first insulator (218), and one end of the first center needle (212) is located inside the fixing flange (211), the second insulator (219) is connected to the outside of the second center needle (213), and the second center needle (213) is connected to the positioning body (216) through the second insulator (219).

6. The differential line test fixture according to claim 1, characterized in that: The test base (2) is provided with a mounting surface (25), the number of the mounting surfaces (25) matches the number of the port connectors (21), the port connectors (21) are vertically mounted on the mounting surface (25), and the port connectors (21) penetrate the mounting surface (25).

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