Circuit board signal testing device, testing system and testing method

Abstract

The invention relates to the technical field of circuit board testing, and provides a circuit board signal testing device, system and method, a circuit board is provided with a plurality of signal via holes, and the circuit board signal testing device comprises a light source and a cable connector; the light source is located below the circuit board and arranged corresponding to the signal via hole, the cable connector is located above the circuit board and comprises a center test pin and a plurality of sensors used for identifying optical signals, the sensors are located in the circumferential direction where the concentric circle of the center test pin is located, and a plurality of through holes are formed in the hole wall of the signal via hole. The plurality of through holes are located in the circumferential direction of the concentric circle of the signal via hole, the through holes are formed in the axial direction of the hole wall of the signal via hole in a penetrating mode, at least one through hole serves as a reference hole, the through holes and the sensors are arranged in an aligned mode, and the center test needle is movably connected with the signal via hole. According to the circuit board signal testing device, the positioning accuracy of the cable connector and the signal through hole in the circuit board can be improved, and then the testing efficiency and accuracy are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit board testing, in particular to a circuit board signal testing device, a testing system and a testing method. BACKGROUND

[0002] In the design verification stage of a circuit board product, for example, in the testing stage of a server mainboard, the integrity of various low-speed and high-speed signals in the server mainboard needs to be tested, and therefore, the insertion loss verification of the server mainboard is an important indicator.

[0003] The existing circuit board signal testing device electrically connects the signal via holes on the circuit board with a vector network analyzer through a cable connector, controls the cable connector to perform point measurement according to the position coordinates of the signal via holes on the circuit board, and then accurately verifies the insertion loss of the circuit board. Since the point measurement area reserved by the signal via holes on the circuit board is small, when the positioning accuracy of the circuit board deviates, the cable connector cannot accurately identify the point of the signal via hole, thereby affecting the efficiency and accuracy of the test. SUMMARY

[0004] The purpose of the present application is to solve the above technical problems, and to provide a circuit board signal testing device, a testing system and a testing method, so as to improve the accuracy of the positioning of the cable connector and the signal via hole on the circuit board, and then improve the efficiency and accuracy of the test. In order to achieve the above purpose, the technical scheme of the present application is as follows: In a first aspect, the present application provides a circuit board signal testing device for testing a circuit board, the circuit board being provided with a plurality of signal via holes, the circuit board signal testing device comprising a light source and a cable connector; the light source is located below the circuit board and corresponds to the signal via holes, and the cable connector is located above the circuit board, the cable connector comprising a center test needle and a plurality of sensors for identifying optical signals, the plurality of sensors being located on the circumferential direction of the concentric circle of the center test needle, a plurality of through holes being provided on the hole wall of the signal via hole, the plurality of through holes being located on the circumferential direction of the concentric circle of the signal via hole, the through holes being provided through the axial direction of the hole wall of the signal via hole, at least one through hole serving as a reference hole, the through holes being provided in alignment with the sensors, and the center test needle being movably connected with the signal via hole.

[0005] In a second aspect, the present application provides a test system comprising the circuit board signal test device, the test device comprising a driving module for driving the cable connector, the test system further comprising a tester and a controller, the controller being connected with the driving module, the tester and the cable connector respectively, the tester being connected with the circuit board through the cable connector; the controller is configured to acquire alignment information of the through hole on the hole wall of the signal via hole and the sensor of the cable connector, determine the coordinates of the signal via hole according to the alignment information, control the center test needle of the cable connector to be positioned to the signal via hole, and acquire test data of the tester; the tester is configured to acquire test data of the circuit board and transmit the test data to the controller.

[0006] In a third aspect, the present application provides a test method for the test system, the method comprising: acquiring coordinates of a through hole with a marking feature on the hole wall of a signal via hole on a circuit board, the through hole with the marking feature being defined as a reference hole, controlling the cable connector to move above the signal via hole so that a set sensor of the cable connector is aligned with the reference hole; controlling the cable connector to rotate and adjust with the set sensor as a fixed point until a plurality of through holes on the hole wall of the signal via hole are aligned with a plurality of sensors of the cable connector; acquiring alignment information of the plurality of through holes on the hole wall of the signal via hole and the plurality of sensors of the cable connector, controlling the center test needle of the cable connector to be positioned to the signal via hole, and acquiring test data of the circuit board.

[0007] Compared with the prior art, the circuit board signal test device, the test system and the test method of the present application have the following beneficial effects: By providing a plurality of sensors for identifying optical signals on the cable connector, the sensors can accurately determine the positions of the through holes on the hole wall of the signal via hole, and the position of the signal via hole is determined by the positions of the plurality of through holes. Since the plurality of through holes are concentrically arranged with the signal via hole, the center test needle of the cable connector is more accurately aligned with the signal via hole. Even if the positioning accuracy of the circuit board deviates, the cable connector can still accurately determine the position of the signal via hole, thereby improving the positioning efficiency and connection accuracy of the center test needle and the signal via hole, and effectively improving the test data accuracy, test efficiency and reliability of the insertion loss. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 FIG. 1 shows a front view of a circuit board signal test device according to an embodiment of the present application; Figure 2 FIG. 2 shows a top view of the circuit board signal test device shown in FIG. 1 according to an embodiment of the present application; Figure 1 FIG. 3 shows a top view of a circuit board according to an embodiment of the present application; Figure 3 FIG. 4 shows a top view of the circuit board shown in FIG. 3 according to an embodiment of the present application; Figure 1 Figure 4 FIG. 5 shows a top view of the circuit board shown in FIG. 3 according to an embodiment of the present application; and Figure 1 ​The cable connector shown is a structural schematic diagram of one embodiment; Figure 5 For Figure 4 The cable connector shown is a partial enlarged schematic diagram of one embodiment; Figure 6 For Figure 4 The cable connector shown is an end surface schematic diagram of one embodiment; Figure 7 For Figure 3 The signal via shown is a top view schematic diagram of one embodiment; Figure 8 For Figure 6 The cable connector shown is an end surface partial schematic diagram of one embodiment; Figure 9 For Figure 1 The cable connector shown is an assembly schematic diagram of one embodiment with the fixing seat; Figure 10 A schematic diagram of a test system provided by the embodiment of the present application.

[0009] Reference signs: Circuit board 1, signal via 11, through hole 12, differential pair signal line 13; Adjustment platform 2, fixing frame 21, lifting column 22, transverse beam 23, longitudinal beam 24; Light source 3; Cable connector 4, center test needle 41, sensor 42, connector housing 43, mounting hole 44; Mechanical arm 5, fixing seat 51; Drive module 61, controller 62, tester 63. DETAILED DESCRIPTION

[0010] In order to make the technical solutions and advantages in the embodiments of the present application clearer, the exemplary embodiments of the present application are further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0011] Embodiment 1 The embodiment provides a circuit board signal testing device for testing a circuit board 1, wherein the circuit board 1 is provided with a plurality of signal vias 11, and the signal via 11 is also called a metallized hole; in the circuit board 1 of a double-sided board and a multi-layer board, a common hole is arranged at the intersection of conductive lines of each layer which needs to be connected, and the common hole is the signal via 11. In the manufacturing process of the signal via 11, a metal layer is plated on the hole wall of the signal via 11 by a chemical deposition method, so as to connect copper foils of intermediate layers which need to be electrically connected, and the upper and lower surfaces of the via are formed in a ring-shaped pad shape. The via can be a through-hole type via and a buried type via, wherein the through-hole type via refers to a via which penetrates all copper foil layers, and the buried type via refers to a via which only penetrates part of the intermediate multiple copper foil layers. In the embodiment, the signal via 11 adopts the through-hole type via to enable a cable connector 4 to access the signal via 11 for testing.

[0012] During the design verification stage of the circuit board 1, the integrity of various low-speed and high-speed signals needs to be tested, for example, the insertion loss verification of a server mainboard is an important test index. The insertion loss refers to the signal loss of a transmission link caused by the insertion of a component in a copper cable or an optical fiber link. It is a natural phenomenon that occurs in all types of signal transmission. The insertion loss is usually measured in decibels (dB). The insertion loss is a key parameter in the wiring of the circuit board 1, and in an ideal case, it is a positive value, which represents the ratio of signal loss by comparing the input power with the output power. The insertion loss can be tested by using a tester 63, for example, a vector network analyzer (VNA), and the lower the positive dB value in the test data, the better the performance. High insertion loss can seriously affect or even prevent the correct transmission of signals from one end of the transmission line to the other end.

[0013] The insertion loss is mainly affected by the loss factor of the material of the circuit board 1, the length of the transmission line of the circuit board 1 and the roughness of the copper foil. In general, the length of the transmission line of the circuit board 1 and the roughness of the copper foil are set values and cannot be changed during the design of the circuit board 1, and the loss factor of the material of the circuit board 1, that is, the dissipation factor (Df) of the dielectric, can be changed due to the influence of the environment. For example, even in a high-temperature environment, the liquid crystal polymer material (LCP) can maintain a low dielectric loss; however, the dielectric loss of the flame-retardant glass fiber epoxy resin composite material (FR4) tends to increase under high-frequency and high-temperature conditions. Therefore, it is necessary to effectively test the insertion loss of the signal via 11 on the circuit board 1.

[0014] The circuit board 1 is provided with a plurality of signal vias 11 arranged in pairs, for example, a plurality of pairs of signal lines exist coupling on a server mainboard, that is, a differential pair is used to transmit a differential signal; the differential signal is a signal transmission mode, which uses two signal lines (that is, a differential pair) to transmit a signal. The two signal lines carry forward signals (DP) and reverse signals (DN) respectively, and the voltage difference between the forward signals and the reverse signals determines the value of the signal. Since the signals of the two lines are opposite, the influence of electromagnetic interference (EMI) and noise can be reduced, because external noise will generate the same interference signal on the two lines, and the signal difference on the two lines will cancel out these noises. The circuit board 1 to be tested is provided with a pair of signal vias 11 at both ends of the differential pair signal line 13, and the number of the pair of signal vias 11 is two. The two pairs of cable connectors 4 are connected to the two pairs of signal vias 11 in correspondence, the tester 63 is connected to the circuit board 1 through the cable connector 4, and then the insertion loss test of the differential pair signal line 13 is effectively realized.

[0015] In the related art, the coordinates of the signal via 11 are usually determined to directly control the cable connector 4 to be inserted into the signal via 11, and then the electrical connection is realized. Since the point measurement area of the signal via 11 is small, when the positioning accuracy of the circuit board 1 deviates, the cable connector 4 is not easy to be accurately positioned to the signal via 11. Therefore, the test device is optimized in the embodiment to solve the above problems, improve the positioning accuracy of the cable connector 4 to the signal via 11, effectively apply to the insertion loss test of the differential pair on the circuit board 1, and then improve the test efficiency and reliability, which will be described in detail below.

[0016] As shown in Figures 1-3 , Figure 7 , Figure 8 , the circuit board signal test device comprises an adjusting platform 2, a fixing frame 21, a light source 3 and a plurality of cable connectors 4; the fixing frame 21 is installed on the adjusting platform 2, so that the fixing frame 21 supports the circuit board 1 to realize multi-axial movement adjustment; the light source 3 is located below the circuit board 1 and corresponds to the signal via 11; the cable connector 4 is located above the circuit board 1; the cable connector 4 comprises a center test pin 41 and a plurality of sensors 42 for identifying light signals; the plurality of sensors 42 are located on the circumferential direction of the concentric circle of the center test pin 41; a plurality of through holes 12 are provided on the hole wall of the signal via 11, and the plurality of through holes 12 are located on the circumferential direction of the concentric circle of the signal via 11; the through holes 12 are provided through the axial direction of the hole wall of the signal via 11; at least one through hole 12 serves as a reference hole; the through hole 12 is arranged in position with the sensor 42; and the center test pin 41 is movably connected with the signal via 11.

[0017] The light source 3 is located below the circuit board 1, and the light can be emitted from the signal via hole 11 to the upper part of the cable connector 4, and then the light can also be emitted from the through hole 12 to be recognized by the sensor 42. The sensor 42 can be an optical fiber sensor 42, which detects the optical signal in the through hole 12, and then determines that the optical fiber sensor 42 is accurately aligned with the through hole 12. Multiple sensors 42 can simultaneously and accurately identify the positions of multiple through holes 12.

[0018] Exemplarily, the plurality of sensors 42 are located on the circumference of the concentric circle of the center test pin 41, and the plurality of sensors 42 are located on the periphery of the center test pin 41. The plurality of sensors 42 can be arranged at equal intervals or non-equal intervals. The hole wall of the signal via hole 11 is provided with a plurality of through holes 12. It is understood that the through holes 12 are formed on the metal layer of the signal via hole 11. For example, the number of through holes 12 of a signal via hole 11 is two, and the two through holes 12 are located on the diameter of the same circle. When the coordinates of the two through holes 12 are determined, the coordinates of the signal via hole 11 can be calculated.

[0019] The through hole 12 is aligned with the sensor 42, and the number of sensors 42 arranged can be greater than the number of through holes 12 arranged, thereby improving the adaptability of the cable connector 4. The cable connector 4 can be suitable for identifying different through hole 12 arrangement positions, and then according to the arrangement position characteristics of the through hole 12, the difference of the signal via hole 11 can be determined. For example, the number of through holes 12 of the above-mentioned signal via hole 11 is two, and the two through holes 12 correspond to the sensors 42 on the diameter of the 0° direction of the cable connector 4 to form a first position characteristic. The number of through holes 12 of another signal via hole 11 can also be two, and the two through holes 12 correspond to the sensors 42 on the diameter of the 90° direction of the cable connector 4 to form a second position characteristic. According to the position characteristics of the arrangement of the through holes 12 on the hole wall of the signal via hole 11, the attributes of the signal via hole 11 corresponding to the through holes 12 with the position characteristics can be defined, which are used to distinguish the different signal via holes 11 connected by the positive signal line and the reverse signal line in the differential pair. Specifically, two signal via holes 11 are arranged at both ends of the positive signal line and two signal via holes 11 are arranged at both ends of the reverse signal line. The signal via holes 11 connected by the positive signal line and the signal via holes 11 connected by the reverse signal line need to be distinguished. The signal via hole 11 where the through hole 12 with the first position characteristic is located can be defined as the signal via hole 11 of the positive signal line, and the signal via hole 11 where the through hole 12 with the second position characteristic is located can be defined as the signal via hole 11 of the reverse signal line. When the two pairs of signal via holes 11 of the positive signal line and the two pairs of signal via holes 11 of the reverse signal line are clear, the tester 63 can realize effective conduction of four test channels to obtain test data.

[0020] The working process of the circuit board signal testing device is specifically as follows: the platform 2 is adjusted to move the circuit board 1 to a designated station in a multi-axis manner, the light source 3 irradiates the lower side of the circuit board 1 to make the through hole 12 transparent, the two pairs of cable connectors 4 are respectively moved to the upper side of the two pairs of signal vias 11, the through hole 12 is aligned with the corresponding sensor 42, the sensor 42 identifies the position characteristics of the through hole 12, and then determines the specific signal line of the differential pair corresponding to the signal via 11, the center test pin 41 of the two pairs of cable connectors 4 is inserted into the two pairs of signal vias 11, the four test channels of the tester 63 are in conduction with the differential pair, the tester 63 transmits an excitation signal to the circuit board 1 and receives an output signal of the circuit board 1, and the tester 63 accurately obtains the test data of the insertion loss.

[0021] In the embodiment, the plurality of sensors 42 for identifying the optical signal are arranged on the cable connector 4, so that the sensor 42 can accurately determine the position of the through hole 12 on the hole wall of the signal via 11, and the position of the signal via 11 is determined by the positions of the plurality of through holes 12. Since the plurality of through holes 12 are concentrically arranged with the signal via 11, the center test pin 41 of the cable connector 4 is more accurately aligned with the signal via 11. Even if the positioning accuracy of the circuit board 1 deviates, the cable connector 4 can still accurately determine the position of the signal via 11, thereby improving the positioning efficiency and connection accuracy of the center test pin 41 and the signal via 11, and effectively improving the accuracy, efficiency and reliability of the test data of the insertion loss.

[0022] In some embodiments, at least three through holes 12 are arranged on the hole wall of the signal via 11, and the three through holes 12 are located at the equidistant positions on the same circumference.

[0023] Exemplarily, as Figure 7As shown, taking an adjacent pair of signal vias 11 as an example, three through holes 12 are arranged on the hole wall of one signal via 11, which are marked as numbers 1, 3, and 5, forming a first position feature; three through holes 12 are arranged on the hole wall of the other signal via 11, which are marked as numbers 2, 4, and 6, forming a second position feature; the first position feature and the second position feature on the pair of signal vias 11 are asymmetrically arranged, and in the direction in which the centers of the pair of signal vias 11 are collinear, the pair of signal vias 11 are superimposed, then the three through holes 12 with the first position feature and the three through holes 12 with the second position feature are staggered with each other and do not coincide. Understandably, the number of sensors 42 arranged on one cable connector 4 can be twice the number of through holes 12 on the hole wall of one signal via 11, and the cable connector 4 has good adaptability, so that one cable connector 4 can be adapted to both the through holes 12 with the first position feature and the through holes 12 with the second position feature; and then according to the first position feature and the second position feature on the signal via 11, the sensors 42 on the pair of cable connectors 4 can accurately align the pair of signal vias 11. The signal via 11 in which the through hole 12 with the first position feature is located can be defined as the signal via 11 of the positive signal line, and the signal via 11 in which the through hole 12 with the second position feature is located can be defined as the signal via 11 of the negative signal line. When two pairs of signal vias 11 of the positive signal line and two pairs of signal vias 11 of the negative signal line are clear, the tester 63 can realize effective conduction of four test channels and obtain test data.

[0024] In some embodiments, as Figure 3 , Figure 7 , Figure 8 As shown, the number of the pair of signal vias 11 is two, and a plurality of differential pair signal lines 13 are arranged in the circuit board 1, and one pair of signal vias 11 is connected to both ends of the differential pair signal line 13. The diameters of the circumferences on which the through holes 12 corresponding to the same end of the differential pair signal line 13 are arranged are the same as the diameters of the circumferences on which the corresponding plurality of sensors 42 are arranged, and the positions of the through holes 12 on one signal via 11 and the through holes 12 on the other signal via 11 are arranged in a staggered manner on the positions of the sensors 42 on the same cable connector 4.

[0025] The signal via hole 11 with the first position feature and the other signal via hole 11 with the second position feature can correspond to one cable connector 4 respectively, and the arrangement position of the sensor 42 of one cable connector 4 corresponds to the signal via hole 11 with the first position feature, and the arrangement position of the sensor 42 of the other cable connector 4 corresponds to the other signal via hole 11 with the second position feature. The two cable connectors 4 can be the same structure, specifically, one pair of cable connectors 4 corresponds to one pair of signal via holes 11, six sensors 42 are arranged on the same circle of the concentric circles of the center test needle 41, and the six sensors 42 are located at the equal division positions on the same circle.

[0026] Among them, the six sensors 42 correspond to the through holes 12 of the signal via hole 11 with the first position feature and the through holes 12 of the other signal via hole 11 with the second position feature respectively, that is, the through holes 12 numbered 1, 3, 5 and the through holes 12 numbered 2, 4, 6 are adapted to the corresponding cable connector 4, so that the cable connector 4 can be effectively adapted to the test of the differential pair, avoiding frequent replacement and debugging, and further improving the test efficiency.

[0027] Exemplarily, the plurality of through holes 12 on the signal via hole 11 form the first position feature for determining one signal line in the differential pair signal line 13, such as the positive signal line; the plurality of through holes 12 on the other signal via hole 11 form the second position feature for determining another signal line in the differential pair signal line 13, such as the negative signal line; any one of the through holes 12 with the first position feature or the second position feature as the reference hole, such as the through hole 12 numbered 1 or the through hole 12 numbered 2, since one pair of cable connectors 4 corresponds to one pair of signal via holes 11, one pair of cable connectors 4 is in a state of synchronous movement, when one through hole 12 as a reference hole is aligned with one sensor 42, one pair of cable connectors 4 only needs to adjust the angle in the horizontal direction to align the remaining sensors 42 with the remaining through holes 12, which improves the convenience and consistency of adjustment. Since the through holes 12 are arranged on the circle, the coordinates of the three through holes 12 can determine the center of the signal via hole 11, when the six through holes 12 are aligned with the sensors 42 on one pair of cable connectors 4, it indicates that the signal via hole 11 is aligned with the center test needle 41, thereby ensuring the accuracy of the subsequent movement of the center test needle 41 on the cable connector 4 to the signal via hole 11.

[0028] In order to make the reference hole more easily recognized by the sensor 42, the reference hole is filled with light-transmitting glue, so that the reference hole has a marking feature and does not affect the normal transmission of the light of the light source 3 out of the reference hole. The light-transmitting glue can have a color, which improves the efficiency and accuracy of the sensor 42 recognizing the reference hole.

[0029] In some embodiments, as Figures 4-6As shown, the cable connector 4 further comprises a connector housing 43, the center test pin 41 and the plurality of sensors 42 are arranged in the connector housing 43, the connector housing 43 is provided with mounting holes 44 for mounting the sensors 42, and the hole walls of the mounting holes 44 are provided with insulating layers.

[0030] The sensors 42 are mounted in the mounting holes 44 to effectively position the sensors 42; the insulating layers can effectively protect the sensors 42, so that the sensors 42 are insulated from the center test pin 41, preventing the introduction of other signals during testing to generate crosstalk.

[0031] In some embodiments, as shown in Figure 1 , Figure 9 As shown, the circuit board signal testing device further comprises a plurality of mechanical arms 5, the mechanical arms 5 are connected with fixing seats 51, and a pair of cable connectors 4 are arranged on the fixing seats 51, specifically, the connector housings 43 are connected with the fixing seats 51, and one mechanical arm 5 can simultaneously drive one pair of cable connectors 4 to move.

[0032] As shown in Figure 1 , Figure 2 The adjusting platform 2 comprises a lifting column 22, a transverse beam 23 and a longitudinal beam 24, the lifting column 22 is arranged in a lifting manner, the longitudinal beams 24 are arranged at intervals on the lifting column 22, the transverse beams 23 are arranged at intervals between the opposite longitudinal beams 24, the transverse beams 23 are arranged in a sliding manner along the longitudinal direction relative to the longitudinal beams 24, the fixing frame 21 is arranged in a sliding manner along the transverse direction relative to the transverse beams 23, and the fixing frame 21 is connected with the circuit board 1 in correspondence. The lifting column 22, the transverse beam 23 and the fixing frame 21 can be respectively driven by driving modules 61, the driving modules 61 can be electrically driven, hydraulically driven or pneumatically driven, for example, the transverse beam 23 or the fixing frame 21 can be moved by a linear motor.

[0033] The fixing frame 21 is arranged in a sliding manner along the transverse beam 23, and the fixing frame 21 and the transverse beam 23 can be fixed by bolts, so that when the fixing frame 21 moves to a specified position, the fixing frame 21 is positioned by being connected with the transverse beam 23 by the bolts. The positioning method is relatively simple and fast.

[0034] The fixing frame 21 is used for supporting and positioning the circuit board 1, and moving the circuit board 1 to a specified station, so that the mechanical arm 5 drives the cable connector 4 to perform alignment operation on the circuit board 1.

[0035] Embodiment 2 The embodiment provides a test system, including the circuit board signal test device in the above embodiment, the test device including a driving module 61 for driving the cable connector 4, the test system further including a tester 63 and a controller 62, the controller 62 being connected with the driving module 61, the tester 63 and the cable connector 4 respectively, the tester 63 being connected with the circuit board 1 through the cable connector 4; the controller 62 is used for acquiring alignment information of the through hole 12 of the hole wall of the signal via hole 11 and the sensor 42 of the cable connector 4, determining the coordinates of the signal via hole 11 according to the alignment information, controlling the central test needle 41 of the cable connector 4 to be positioned to the signal via hole 11, and acquiring test data of the tester 63; and the tester 63 is used for collecting the test data of the circuit board 1 and transmitting the test data to the controller 62.

[0036] The driving module 61 can also be used to drive the adjusting platform 2, so that the circuit board 1 is positioned to a specified station.

[0037] The controller 62 controls the driving module 61 to drive the cable connector 4 to move, so that a sensor 42 on the cable connector 4 is aligned with the reference hole, and the controller 62 controls the driving module 61 to drive the cable connector 4 to rotate and adjust with the sensor 42 corresponding to the reference hole as a fixed point, until all the through holes 12 are aligned with the corresponding sensors 42; wherein the alignment information includes the coordinates of the through holes 12 and the coordinates of the sensors 42, and the coordinates of the central test needle 41 are calculated, and when the alignment information is determined, the coordinates of the signal via hole 11 can be determined. According to the coordinates of the signal via hole 11, the controller 62 controls the driving module 61 to drive the central test needle 41 of the cable connector 4 to be inserted into the signal via hole 11. When the two pairs of signal via holes 11 of the differential pair are connected with the corresponding central test needles 41, the tester 63 transmits an excitation signal to the differential pair and receives an output signal of the differential pair, so that the test data is acquired. The test data is transmitted to the controller 62, the controller 62 analyzes the test data, and generates a test report.

[0038] Embodiment 3 The embodiment provides a test method, which is used for the test system in the above embodiment, and the method includes the following steps. S1, acquiring the coordinates of the through hole 12 with a marked feature on the hole wall of the signal via hole 11 on the circuit board 1, defining the through hole 12 with the marked feature as a reference hole, and controlling the cable connector 4 to move above the signal via hole 11, so that a set sensor of the cable connector 4 is aligned with the reference hole.

[0039] The marking feature refers to the filling of the through hole 12 with light-transmitting glue, and the light passing through the light-transmitting glue changes in intensity, which can be effectively and quickly recognized by the setting sensor, thereby improving the initial positioning efficiency of the cable connector 4. The setting sensor refers to the sensor 42 corresponding to the position feature on the hole wall of the signal via hole 11. For example, the reference hole is the through hole 12 numbered 1, and the sensor 42 on the cable connector 4 corresponding to the position of the through hole 12 numbered 1 in the height direction is the setting sensor.

[0040] Specifically, the controller 62 obtains the coordinates of the through hole 12 with the marking feature, and the controller 62 controls the driving module 61 to drive the cable connector 4 to move above the signal via hole 11, so that the setting sensor can effectively recognize the light signal of the reference hole, and then determine the alignment of the setting sensor and the reference hole.

[0041] S2, control the cable connector 4 to rotate and adjust with the setting sensor as the fixed point, until the hole wall of the signal via hole 11 is aligned with the multiple through holes 12 and the multiple sensors 42 of the cable connector 4.

[0042] The reference hole and the corresponding sensor 42 are aligned in the height direction, and the multiple sensors 42 are arranged on the same horizontal end face of the cable connector 4, and then the cable controller 62 is rotated and adjusted in the horizontal direction to align the remaining other through holes 12 with the corresponding sensors 42. For example, after a pair of cable connectors 4 are aligned with the through hole 12 numbered 1 with the setting sensor, the cable connectors 4 are rotated and adjusted until the other sensors 42 are aligned with the through holes 12 numbered 3, 5, 2, 4, and 6. All sensors 42 on a pair of cable connectors 4 are aligned with the through holes 12 on the hole wall of a pair of signal via holes 11. Since the adjacent spacing of a pair of signal via holes 11 corresponding to the differential signal line 13 is small, a pair of cable connectors 4 can be synchronously adjusted; when the spacing of multiple signal via holes 11 to be tested is large, the arrangement mode of the sensors 42 on the cable connector 4 corresponds to the position feature of the signal via hole 11 to be tested.

[0043] Specifically, the controller 62 controls the driving module 61 to drive the cable connector 4 to rotate in the RZ direction with the setting sensor as the fixed point, and the Z direction is the height direction of the circuit board. The multiple sensors 42 of the cable connector 4 recognize the light signals of the multiple through holes 12 on the hole wall of the signal via hole 11, and determine the alignment of the multiple through holes 12 and the multiple sensors 42.

[0044] S3, obtain the alignment information of the multiple through holes 12 on the hole wall of the signal via hole 11 and the multiple sensors 42 of the cable connector 4, control the center test pin 41 of the cable connector 4 to be positioned to the signal via hole 11, and obtain the test data of the circuit board 1.

[0045] The alignment information includes coordinates of the plurality of through holes 12 and coordinates of the plurality of sensors 42, and the arrangement positions of the sensors 42 and the arrangement position of the center test pin 41 on the cable connector 4 have set parameters, so that the coordinates of the center test pin 41 can be determined; the arrangement positions of the through holes 12 on the signal via 11 and the arrangement position of the signal via 11 have set parameters, so that the coordinates of the signal via 11 can be determined; when the cable connector 4 is preliminarily positioned by the mechanical arm 5, the set sensor detects the light signal of the reference hole, the relative position of the center test pin 41 and the signal via 11 is determined according to the alignment of the set sensor and the reference hole, and then the controller 62 controls the center test pin 41 of the cable connector 4 to move and position to the signal via 11, so that the center test pin 41 and the signal via 11 are kept in plug-in position, and the four test channels of the tester 63 are respectively communicated with two pairs of signal vias 11.

[0046] The tester 63 transmits excitation signals to the differential pairs and receives output signals of the differential pairs, so as to realize acquisition of test data. The test data is transmitted to the controller 62, the controller 62 analyzes the test data, and generates a test report.

[0047] In the description of the present application: Unless otherwise defined, the orientation words such as "upper", "lower" generally refer to the "upper", "lower" of the corresponding components in the use state in the direction of gravity. "Inner", "outer" is relative to the "inner", "outer" of the corresponding component itself.

[0048] The terms "first", "second", "third", etc. are only used for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. The meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0049] Unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] Although the preferred embodiments of the present application have been described, they are not as a limitation to the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the inventive concept and scope of the present application.

Claims

1. A circuit board signal testing device for testing a circuit board (1), wherein the circuit board (1) is provided with a plurality of signal vias (11), characterized in that: The circuit board signal testing device includes a light source (3) and a cable connector (4); the light source (3) is located below the circuit board (1) and is set corresponding to the signal via (11); the cable connector (4) is located above the circuit board (1); the cable connector (4) includes a central test pin (41) and multiple sensors (42) for identifying light signals; the multiple sensors (42) are located in the circumferential direction of the concentric circle of the central test pin (41); multiple through holes (12) are provided on the hole wall of the signal via (11); the multiple through holes (12) are located in the circumferential direction of the concentric circle of the signal via (11); the through holes (12) are axially connected along the hole wall of the signal via (11); at least one through hole (12) serves as a reference hole; the through hole (12) is aligned with the sensor (42); and the central test pin (41) is movably connected to the signal via (11).

2. The circuit board signal testing device according to claim 1, characterized in that: The signal via (11) has at least three through holes (12) on its wall, and the three through holes (12) are located at equal intervals on the same circumference.

3. The circuit board signal testing device according to claim 2, characterized in that: The number of signal vias (11) is two. The circuit board (1) is provided with multiple differential pair signal lines (13). Each end of the differential pair signal line (13) is connected to a pair of signal vias (11).

4. The circuit board signal testing device according to claim 3, characterized in that: The diameter of the circumference of the through holes (12) on the two signal vias (11) corresponding to the same end of the differential pair signal line (13) is the same as the diameter of the circumference of the sensors (42) on the pair of cable connectors (4). The through holes (12) on one signal via (11) and the through holes (12) on the other signal via (11) are arranged in a staggered manner on the position of the sensor (42) on the same cable connector (4).

5. The circuit board signal testing device according to claim 4, characterized in that: A pair of cable connectors (4) are provided corresponding to a pair of signal vias (11). Six sensors (42) are arranged around the concentric circle of the central test pin (41), and the six sensors (42) are located at equal intervals on the same circumference.

6. The circuit board signal testing device according to claim 5, characterized in that: A plurality of through holes (12) on one of the signal vias (11) form a first position feature for determining one signal line in the differential pair signal lines (13); a plurality of through holes (12) on another of the signal vias (11) form a second position feature for determining another signal line in the differential pair signal lines (13); one of the through holes (12) having the first position feature or the second position feature serves as a reference hole, and the reference hole is used to fill with light-transmitting adhesive so that the reference hole has a marking feature.

7. The circuit board signal testing device according to claim 1, characterized in that: The cable connector (4) also includes a connector housing (43), the center test pin (41) and a plurality of sensors (42) are disposed inside the connector housing (43), and the connector housing (43) has mounting holes (44) for mounting the sensors (42), and the wall of the mounting holes (44) is provided with an insulating layer.

8. The circuit board signal testing device according to claim 1, characterized in that: The circuit board signal testing device also includes an adjustment platform (2), a fixing frame (21), and multiple robotic arms (5). The fixing frame (21) is installed on the adjustment platform (2) so that the fixing frame (21) supports the circuit board (1) to achieve multi-axial movement and adjustment. The robotic arm (5) is connected to a fixed seat (51), and a pair of cable connectors (4) are provided on the fixed seat (51). The adjustment platform (2) includes a lifting column (22), a transverse beam (23), and a longitudinal beam (24). The lifting column (22) can be lifted and lowered. The lifting column (22) is provided with longitudinal beams (24) arranged at intervals. Transverse beams (23) are arranged at intervals between the longitudinal beams (24). The transverse beams (23) are slidably arranged longitudinally relative to the longitudinal beams (24). The fixing frame (21) is slidably arranged transversely relative to the transverse beams (23). The fixing frame (21) is correspondingly connected to the circuit board (1).

9. A testing system, comprising the circuit board signal testing device as described in any one of claims 1-8, characterized in that: The testing device includes a drive module (61) for driving the cable connector (4), and the testing system also includes a tester (63) and a controller (62). The controller (62) is connected to the drive module (61), the tester (63) and the cable connector (4) respectively. The tester (63) is connected to the circuit board (1) through the cable connector (4). The controller (62) is used to acquire the alignment information between the through hole (12) on the wall of the signal via (11) and the sensor (42) of the cable connector (4), determine the coordinates of the signal via (11) based on the alignment information, control the center test pin (41) of the cable connector (4) to be positioned to the signal via (11), and acquire the test data of the tester (63). The tester (63) is used to collect test data of the circuit board (1) and transmit the test data to the controller (62).

10. A testing method for the testing system as described in claim 9, characterized in that the method... include: The coordinates of the through hole (12) with marking features on the hole wall of the signal via (11) on the circuit board (1) are obtained. The through hole (12) with marking features is defined as the reference hole. The control cable connector (4) is moved above the signal via (11) so that the setting sensor of the cable connector (4) is aligned with the reference hole. Control the cable connector (4) to rotate and adjust around the set sensor until the multiple through holes (12) on the hole wall of the signal through hole (11) are aligned with the multiple sensors (42) of the cable connector (4); The alignment information of multiple through holes (12) on the wall of the signal via (11) and multiple sensors (42) of the cable connector (4) is obtained, and the center test pin (41) of the cable connector (4) is positioned to the signal via (11) to obtain the test data of the circuit board (1).

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