CN113985255A - Circuit board static test system and test method - Google Patents
Circuit board static test system and test method Download PDFInfo
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- CN113985255A CN113985255A CN202111277538.3A CN202111277538A CN113985255A CN 113985255 A CN113985255 A CN 113985255A CN 202111277538 A CN202111277538 A CN 202111277538A CN 113985255 A CN113985255 A CN 113985255A
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Abstract
The invention discloses a static test system and a static test method for a circuit board, belongs to the technical field of circuit board performance detection, and solves the problems that a test needle for static test of the circuit board in the prior art cannot detect a test point of the circuit board at a certain angle and is expensive. The system comprises an attitude controller, a test unit, a controller and a mechanical arm with multiple degrees of freedom; the controller comprises a posture control module, an acquisition control module and a coordinate posture storage module, the test unit comprises a communication module and an acquisition module, the mechanical arm is in signal connection with the posture control module through the posture controller, and the acquisition module is in signal connection with the acquisition control module through the communication module; the acquisition module is arranged on the movable end of the mechanical arm. The test system and method can be used in circuit board static.
Description
Technical Field
The invention belongs to the technical field of circuit board performance detection, and particularly relates to a circuit board static test system and a test method.
Background
At present, the static test technology of the circuit board mainly comprises an online tester (ICT) test and a flying probe test.
The on-line tester mainly comprises a testing point for contacting the circuit board by pressing a needle bed designed in advance, so as to detect whether the circuit board is short-circuited or broken circuit during welding, namely static testing. However, the in-line tester needs to customize a dedicated test fixture for each circuit board, which results in expensive equipment, and the in-line tester also needs a dedicated technician to write a test program, which is a high threshold for operation.
The flying probe test is a static test in which 4, 6, and 8 test probes moving at high speed are mounted on an XYZ axis motion mechanism, and the probes are moved to test points of a circuit board by the movement of the mechanism. However, the price of the flying probe test equipment is also very expensive, and the price of the equipment in the market is not less than 50 ten thousand.
In addition, the test needles of the two test devices are both pressed down perpendicular to the circuit board, and the test points of the circuit board cannot be detected at a certain angle.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a circuit board static test system and a test method, which solve the problems that the test pin for circuit board static test in the prior art cannot detect the test point of the circuit board at a certain angle and is expensive.
The purpose of the invention is mainly realized by the following technical scheme:
the invention provides a static test system of a circuit board, which comprises an attitude controller (such as a servo controller), a test unit, a controller and a mechanical arm with multiple degrees of freedom; the testing unit comprises a communication module and an acquisition module, the mechanical arm is in signal connection with the attitude control module through the attitude controller, and the acquisition module is in signal connection with the acquisition control module through the communication module; the acquisition module is arranged on the movable end of the mechanical arm.
Further, the attitude controller is connected with the attitude control module through a network cable.
Furthermore, the communication module is connected with the acquisition control module through an RS232 serial bus, one end of the RS232 serial bus is connected with the serial port of the acquisition control module, and the other end of the RS232 serial bus is connected with the serial port of the communication module.
Further, the mechanical arm is a mechanical arm with 6 degrees of freedom, and comprises a mounting seat, a first joint, a second joint, a third joint, a fourth joint, a fifth joint and a sixth joint which are sequentially connected in a rotating mode from a fixed end to a movable end of the mechanical arm.
Further, the first joint, the fourth joint, the fifth joint and the sixth joint are straight cylindrical, the second joint is T-shaped, the third joint is L-shaped, the first joint rotates along the XY plane, the second joint, the third joint and the fourth joint rotate along the YZ plane, the fifth joint rotates along the XY plane, and the sixth joint rotates along the XZ plane.
Further, the acquisition module is the universal meter, and the universal meter has two probes: the test probe is arranged at the movable end of the mechanical arm, and during static test, the grounding probe is connected with the ground and the test probe is connected with a point to be tested.
Further, the test probe comprises a needle tube, a needle rod, a needle point and an elastic element (for example, a spring), wherein the needle point is arranged at one end of the needle rod, and the needle tube is sleeved at the other end of the needle rod and is connected with the needle rod through the elastic element.
Furthermore, the surface of the needle point is provided with a gold plating layer.
Furthermore, the static test system for the circuit board further comprises a coordinate aligner, the coordinate aligner is aligned to the point to be tested, the attitude controller obtains actual coordinate data and actual attitude data of the coordinate aligner and sends the actual coordinate data and the actual attitude data to the attitude control module, and the attitude control module sends the actual coordinate data and the actual attitude data to the coordinate attitude storage module for storage.
Furthermore, the coordinate positioner is a cross laser positioner, and the cross point of cross laser generated by the cross laser positioner is aligned with the point to be tested.
Furthermore, two leads of the cross laser locator are welded to the PIN1 PIN and the PIN10 PIN of the aviation plug HR10A-10R-12P and then inserted into the plug HR10A-10R-12S of the flange at the movable end of the mechanical arm.
Furthermore, the controller further comprises a difference value deduction module, the attitude control module is connected with the coordinate attitude storage module through the difference value deduction module, the difference value deduction module acquires actual attitude data of the coordinate aligner sent by the attitude control module, deducts an attitude difference value between the coordinate aligner and the acquisition module, obtains actual attitude data of the point to be tested, and sends the actual attitude data to the coordinate attitude storage module.
Further, the controller further comprises a display unit (for example, a display) connected with the communication module, and the communication module acquires the resistance value acquired by the acquisition module and sends the resistance value to the display unit for displaying.
Further, the controller further comprises a change rate calculation module, the communication module is connected with the display unit through the change rate calculation module, the change rate calculation module acquires the resistance value sent by the communication module in real time and calculates the change rate of the two adjacent resistance values, when the change rate is smaller than a threshold value, the resistance value is determined to approach a final value, and at the moment, the change rate calculation module sends the next resistance value to the display unit for displaying.
Further, the acquisition module comprises a low gear, a medium gear and a high gear, the controller further comprises a gear judgment module, and the communication module is connected with the acquisition control module through the gear judgment module. When the test starts, the acquisition module is in a low gear, the communication module acquires the resistance value acquired by the acquisition module in real time and sends the resistance value to the gear judgment module, the gear judgment module judges whether the resistance value exceeds the current gear measurement range, if so, a gear switching instruction is sent to the acquisition control module, and the acquisition control module controls the acquisition module to be switched to the next gear through the communication module according to the gear switching instruction.
The invention also provides a static test method of the circuit board, which comprises the following steps:
step 1: the gesture control module acquires actual coordinate information of a point to be tested in a coordinate gesture table stored in the coordinate gesture storage module and actual gesture information of the mechanical arm;
step 2: according to the coordinate information and the posture information, the posture controller adjusts the posture of the mechanical arm, so that the acquisition module at the movable end of the mechanical arm is aligned to the point to be tested;
and step 3: the acquisition control module sends an acquisition signal to the communication module, and the communication module controls the acquisition module to acquire the resistance value of the point to be tested according to the acquisition signal, so that the static test of the circuit board is completed.
Further, the step 1 further comprises the following steps:
step 11: aligning a coordinate aligner to a point to be tested;
step 12: the attitude controller acquires actual coordinate data and actual attitude data of the coordinate aligner and sends the actual coordinate data and the actual attitude data to the attitude control module;
step 13: the attitude control module sends the actual coordinate data and the actual attitude data to the coordinate attitude storage module for storage;
step 14: and (4) repeating the steps 1 to 3 to obtain actual coordinate data and actual attitude data of a plurality of points to be tested, and obtaining a coordinate attitude table.
Further, the step 13 includes the steps of:
the difference deduction module obtains actual attitude data of the coordinate aligner sent by the attitude control module, deducts an attitude difference between the coordinate aligner and the acquisition module, obtains actual attitude data of the point to be tested, and sends the actual attitude data to the coordinate attitude storage module for storage.
Further, in step 3, after the communication module controls the acquisition module to acquire the resistance value of the point to be tested according to the acquisition signal, the method further includes the following steps:
the change rate calculation module acquires the resistance value sent by the communication module in real time and calculates the change rate of two adjacent resistance values, when the change rate is smaller than a threshold value, the resistance value is determined to be close to a final value, and the change rate calculation module sends the latter resistance value to the display unit for displaying.
Further, the communication module controls the acquisition module to acquire the resistance value of the point to be tested according to the acquisition signal, and the method comprises the following steps:
the acquisition module is in low gear, and communication module acquires the resistance value of acquisition module collection in real time and sends to gear judgment module, and gear judgment module judges whether the resistance value exceeds current gear measuring range, if exceed, then sends gear switching instruction to acquisition control module, and acquisition control module switches to next gear through communication module control acquisition module according to gear switching instruction.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
a) according to the static test system for the circuit board, the free motion attribute of the mechanical arm is applied to the static test of the circuit board, and the acquisition module can be adjusted to be at any angle by controlling the posture of the mechanical arm with multiple degrees of freedom, so that the static test of the test points on the circuit board can be performed at any angle, and the problem that the test points of the circuit board cannot be detected at a certain angle by a test needle is solved.
b) The static test system of the circuit board provided by the invention does not need to customize a special test fixture for the circuit board, does not need to be programmed before testing, can carry out static test on the circuit board of a certain type only by positioning according to the coordinate table of the test point, and has low cost and price only about one tenth of that of the existing static test equipment.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a first prior art scenario of probing test points of a circuit board at an angle;
FIG. 2 is a second prior art case of probing test points of a circuit board at an angle;
FIG. 3 illustrates a third prior art situation in which test points of a circuit board are probed at an angle;
FIG. 4 is a schematic structural diagram of a static test system for circuit boards according to the present invention, without showing an acquisition module;
FIG. 5 is a schematic diagram of the connection between the acquisition module and the controller in the circuit board static test system according to the present invention;
FIG. 6 is a schematic structural diagram of a probe in a static test system for a circuit board according to the present invention;
FIG. 7 is a schematic diagram of the positions of a robot arm, a coordinate positioner and an acquisition module in the static test system for circuit boards according to the present invention;
fig. 8 is a flowchart of a static test method for a circuit board according to the present invention.
Reference numerals:
1-test point; 2-leaving no test point pad; 3-structural heat sink; 4-a mechanical arm; 41-a mounting seat; 42-a first joint; 43-second joint; 44-third joint; 45-fourth joint; 46-fifth joint; 47-sixth joint; 5-attitude controller; 6-an acquisition module; 61-needle tube; 62-needle bar; 63-needle tip; 64-an elastic member; 7-a controller; 8-coordinate aligner.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention.
In practical applications, there are cases where the test needle needs to probe the test point of the circuit board at a certain angle (not 90 °), which are as follows:
in the first case, as shown in fig. 1, a part of the circuit board is provided with a structural heat sink 3, which causes spatial interference with the test point 1 and cannot be tested vertically.
In the second case, referring to fig. 2, after two circuit boards are vertically welded, a test point 1 on the vertically arranged circuit board needs to be statically tested, and then a test probe needs to be horizontally detected.
In the third case, referring to fig. 3, the test points of all pads are not reserved during the design of the network pad to be tested, so that the probe cannot be tested vertically when testing the pad 2 without the test point, and can only be probed at a certain angle.
For the situation that the test needle cannot perform vertical detection, the circuit board static test system provided by the invention, referring to fig. 4 to 7, includes an attitude controller 5 (e.g., a servo controller), a test unit, a controller 7, and a robot arm 4 with multiple degrees of freedom; the controller 7 comprises an attitude control module, an acquisition control module and a coordinate attitude storage module, the test unit comprises a communication module and an acquisition module 6, the mechanical arm 4 is in signal connection with the attitude control module through an attitude controller 5, the attitude controller 5 is connected with the attitude control module through a network cable, the acquisition module 6 is in signal connection with the acquisition control module through the communication module, the communication module is connected with the acquisition control module through an RS232 serial bus, one end of the RS232 serial bus is connected with a serial port of the acquisition control module, and the other end of the RS232 serial bus is connected with a serial port of the communication module; the acquisition module 6 is arranged on a flange at the movable end of the mechanical arm 4.
During implementation, the attitude control module acquires coordinate information of a point to be tested in a coordinate attitude table stored in the coordinate attitude storage module and attitude information of the mechanical arm 4, and adjusts the attitude of the mechanical arm 4 through the attitude controller 5 according to the coordinate information and the attitude information, so that the acquisition module 6 at the movable end of the mechanical arm 4 is aligned with the point to be tested; then, the acquisition control module sends an acquisition signal to the communication module, and the communication module controls the acquisition module 6 to acquire the resistance value of the point to be tested according to the acquisition signal, so that the static test of the circuit board is completed.
Compared with the prior art, the static test system for the circuit board, provided by the invention, applies the free motion attribute of the mechanical arm 4 to the static test of the circuit board, and can adjust the acquisition module to be at any angle by controlling the posture of the mechanical arm 4 with multiple degrees of freedom, so that the static test of the test point on the circuit board can be performed at any angle, and the problem that the test point of the circuit board cannot be detected at a certain angle by a test needle is solved.
Meanwhile, the static test system of the circuit board does not need to customize a special test fixture for the circuit board, does not need to be programmed before testing, can carry out static test on the circuit board of a certain type only by positioning according to a coordinate table of the test point, and has low cost and price of about one tenth of that of the existing static test equipment.
For the structure of the robot arm 4 having multiple degrees of freedom, the robot arm 4 may exemplarily be a robot arm 4 having 6 degrees of freedom including a mount 41, a first joint 42, a second joint 43, a third joint 44, a fourth joint 45, a fifth joint 46, and a sixth joint 47 rotatably connected in this order along a fixed end to a movable end of the robot arm 4, the first joint 42, the fourth joint 45, the fifth joint 46, and the sixth joint 47 having a straight cylindrical shape, the second joint 43 having a T-shape, the third joint 44 having an L-shape, the first joint 42 being rotatable along an XY plane, the second joint 43, the third joint 44, and the fourth joint 45 being rotatable along a YZ plane, the fifth joint 46 being rotatable along an XY plane, the sixth joint 46 being rotatable along an XZ plane, therefore, the acquisition module can be contacted with the point to be tested at any angle, and the point to be tested is subjected to static test.
The selection of the acquisition module 6 can be a universal meter, the universal meter comprises a grounding probe and a test probe which are respectively connected with the communication module, the test probe is arranged at the movable end of the mechanical arm 4, during static test, the grounding probe is connected with the ground, and the test probe is connected with a point to be tested.
Considering that there is a certain error in the control precision of the robot arm 4, once the test probe is in rigid contact with the point to be tested, it is likely to damage the point to be tested, and thus to discard the circuit board, the structure of the test probe, specifically, it includes a needle tube 61, a needle rod 62, a needle tip 63 and an elastic member 64 (e.g., a spring), the needle tip 63 is disposed at one end of the needle rod 62, and the needle tube 61 is sleeved at the other end of the needle rod 62 and connected with the needle rod 62 through the elastic member 64. Thus, the contact between the needle tip 63 and the point to be tested can be changed into elastic contact through the arrangement of the elastic member 64, when the needle tip 63 contacts the point to be tested, the point to be tested applies pressure to the needle tip 63, so that the elastic member 64 is compressed, and the needle tip 63 and the needle rod 62 are integrally retracted into the needle tube 61, thereby preventing the needle tip 63 from damaging the point to be tested.
In order to ensure the test accuracy of the test probe, the gold plating layer is arranged on the surface of the needle tip 63, so that the metal gold has good conductivity and oxidation resistance, and the gold plating on the surface of the needle tip 63 can effectively improve the test accuracy and prolong the service life of the needle tip 63.
It should be noted that, in practical application, due to the processing error of the circuit board and the influence of thermal expansion and cold contraction, the actual coordinate of the actual point to be tested may have an error with the design coordinate of the point to be tested, at this time, if the posture of the mechanical arm 4 is controlled according to the design coordinate of the point to be tested, a situation that the acquisition module 6 cannot align with the point to be tested may occur, therefore, the static test system for circuit board further includes a coordinate aligner 8, so that the coordinate aligner 8 aligns with the point to be tested, the posture controller 5 acquires the actual coordinate data and the actual posture data of the coordinate aligner 8 and sends the data to the posture control module, the posture control module sends the actual coordinate data and the actual posture data to the coordinate posture storage module for storage, it should be noted that the processing error and the thermal expansion and cold contraction are basically consistent under the normal condition of the circuit boards of the same batch, therefore, static test can be performed on a plurality of circuit boards in the same batch by acquiring the actual coordinates of a plurality of test points to obtain the actual coordinate attitude table only by acquiring the actual coordinates of the plurality of test points for one circuit board in the same batch.
The coordinate positioner can be a cross laser positioner, and the cross point of cross laser generated by the cross laser positioner is aligned to the point to be tested to perform coordinate positioning.
Illustratively, the two leads of the cross laser locator are welded to the PINs of PIN1 and PIN10 of the aviation plugs HR10A-10R-12P and then inserted into the PINs HR10A-10R-12S of the flange at the free end of the robot arm 4.
It should be noted that, because the coordinate positioner and the acquisition module 6 are both disposed at the movable end of the mechanical arm 4, and the two cannot be completely overlapped, the attitude control module can only obtain the actual attitude data of the mechanical arm 4 corresponding to the actual coordinate data of the coordinate positioner, the actual posture of the mechanical arm 4 corresponding to the actual coordinate data of the coordinate positioner has a certain difference with the actual posture of the mechanical arm 4 corresponding to the actual coordinate data of the coordinate positioner when the acquisition module 6 acquires the actual posture, therefore, the controller 7 further comprises a difference value deduction module, the attitude control module is connected with the coordinate attitude storage module through the difference value deduction module, the difference value deduction module obtains the actual attitude data of the coordinate aligner 8 sent by the attitude control module, and deducing the attitude difference between the coordinate aligner 8 and the acquisition module 6 to obtain the actual attitude data of the point to be tested and sending the actual attitude data to the coordinate attitude storage module.
It is understood that, in order to make the static test result known to the operator, the controller 7 further includes a display unit (e.g., a display) connected to the communication module, and the communication module obtains the resistance value collected by the collection module 6 and sends the resistance value to the display unit for displaying.
Considering that the acquisition module 6 has parasitic capacitance in the resistor acquisition process, the resistance value is constantly changed and gradually approaches to the final value, in order to determine when the resistance value is the final resistance value and display the final resistance value, the controller 7 further includes a change rate calculation module, the communication module is connected with the display unit through the change rate calculation module, the change rate calculation module obtains the resistance value sent by the communication module in real time and calculates the change rate of two adjacent resistance values, when the change rate is smaller than a threshold value, the resistance value can be determined to approach to the final value, and at this time, the change rate calculation module sends the next resistance value to the display unit for display.
It should be noted that, when the acquisition module 6 adopts a universal meter, the universal meter has a corresponding test gear, for example, when the resistance value is 5 Ω, a 0-10 Ω gear should be selected correspondingly, when the resistance value is 500 Ω, a 10-1000 Ω gear should be selected correspondingly, when the resistance value is 25k Ω, a 1-50 k Ω gear should be selected correspondingly, in order to be able to select a corresponding gear, for example, the acquisition module 6 includes a low gear (for example, a 0-10 Ω gear), a medium gear (for example, a 10-1000 Ω gear), and a high gear (for example, a 1-50 k Ω gear), and the controller 7 further includes a gear determination module, and the communication module is connected to the acquisition control module through the gear determination module. When the test starts, the acquisition module 6 is in a low gear, the communication module acquires the resistance value acquired by the acquisition module 6 in real time and sends the resistance value to the gear judgment module, the gear judgment module judges whether the resistance value exceeds the current gear measurement range, if so, a gear switching instruction is sent to the acquisition control module, and the acquisition control module controls the acquisition module 6 to switch to the next gear through the communication module according to the gear switching instruction, so that the proper gear can be adjusted according to the resistance value, and the self-adaptability of the static test system of the circuit board is improved.
The invention also provides a static test method of the circuit board, referring to fig. 8, the static test system of the circuit board is adopted, and the test method comprises the following steps:
step 1: the gesture control module acquires actual coordinate information of a point to be tested in a coordinate gesture table stored in the coordinate gesture storage module and actual gesture information of the mechanical arm;
step 2: according to the coordinate information and the posture information, the posture controller adjusts the posture of the mechanical arm, so that the acquisition module at the movable end of the mechanical arm is aligned to the point to be tested;
and step 3: the acquisition control module sends an acquisition signal to the communication module, and the communication module controls the acquisition module to acquire the resistance value of the point to be tested according to the acquisition signal, so that the static test of the circuit board is completed.
Compared with the prior art, the beneficial effects of the circuit board static test method provided by the invention are basically the same as those of the circuit board static test system provided by the invention, and are not repeated herein.
When the static test system for the circuit board further comprises a coordinate aligner in order to obtain a coordinate posture table, the step 1 further comprises the following steps:
step 11: aligning a coordinate aligner to a point to be tested;
step 12: the attitude controller acquires actual coordinate data and actual attitude data of the coordinate aligner and sends the actual coordinate data and the actual attitude data to the attitude control module;
step 13: the attitude control module sends the actual coordinate data and the actual attitude data to the coordinate attitude storage module for storage;
step 14: and (4) repeating the steps 1 to 3 to obtain actual coordinate data and actual attitude data of a plurality of points to be tested, and obtaining a coordinate attitude table.
Because the coordinate locator and the acquisition module are both arranged at the movable end of the mechanical arm and cannot be completely superposed, the attitude control module can only acquire the actual attitude data of the mechanical arm corresponding to the actual coordinate data of the coordinate locator, and the actual attitude of the mechanical arm corresponding to the actual coordinate data of the coordinate locator has a certain difference with the actual attitude of the mechanical arm corresponding to the acquisition module during acquisition, when the controller further comprises a difference deduction module, the step 13 comprises the following steps:
the difference deduction module obtains actual attitude data of the coordinate aligner sent by the attitude control module, deducts an attitude difference between the coordinate aligner and the acquisition module, obtains actual attitude data of the point to be tested, and sends the actual attitude data to the coordinate attitude storage module for storage.
In order to determine when the resistance value is the final resistance value and display the final resistance value, when the controller further includes a display unit and a change rate calculation module, in step 3, the communication module further includes the following steps after controlling the acquisition module to acquire the resistance value of the point to be tested according to the acquired signal:
the change rate calculation module acquires the resistance value sent by the communication module in real time and calculates the change rate of two adjacent resistance values, when the change rate is smaller than a threshold value, the resistance value is determined to be close to a final value, and the change rate calculation module sends the latter resistance value to the display unit for displaying.
In order to select corresponding gears, the acquisition module comprises a low gear, a medium gear and a high gear, and when the controller further comprises a gear judgment module, the communication module controls the acquisition module to acquire the resistance value of the point to be tested according to the acquisition signal, and the method comprises the following steps: the acquisition module is in low gear, and communication module acquires the resistance value of acquisition module collection in real time and sends to gear judgment module, and gear judgment module judges whether the resistance value exceeds current gear measuring range, if surpass, then sends gear switching instruction to acquisition control module, and acquisition control module passes through communication module control acquisition module according to gear switching instruction and switches to next gear to can adjust to suitable gear according to the resistance value, improve above-mentioned circuit board static test system's adaptability.
Example one
The circuit board static test method provided by the embodiment comprises the following steps:
step a: the controller checks whether the mechanical arm is normally connected or not, if not, the controller prompts abnormal connection, and an operator checks the connection condition of the mechanical arm, and if so, the step b is carried out;
step b: the controller checks whether the acquisition module is normally connected, if not, the controller prompts that the connection is abnormal, and an operator checks the connection condition of the acquisition module, and if so, the step c is carried out;
step c: reading the category and the bar code of the sample circuit board, loading corresponding to-be-tested point information (such as the number, the coordinates and the like), checking whether the to-be-tested point information is complete, if not, adding the to-be-tested point information of the sample circuit board, and if so, performing the step d;
step d: positioning a certain point to be tested of the sample circuit board by adopting a cross laser positioner, and acquiring coordinate data of the point to be tested and attitude data of the mechanical arm;
step e: deducting a posture data difference value of the mechanical arm generated by the distance between the cross laser and the acquisition module to obtain actual posture data of the mechanical arm during testing;
step f: repeating the steps d to e to obtain actual coordinate data of all points to be tested of the sample circuit board and corresponding actual gesture data of the mechanical arm;
step g: installing another circuit board in the same batch as the sample circuit board in the test system;
step h: controlling the posture of the mechanical arm to enable the acquisition module to be aligned to the point to be tested, checking whether the acquisition module moves in place, if not, further adjusting the posture of the mechanical arm, and if so, performing the step i;
step i: and the needle point is contacted with a point to be tested, the universal meter is adjusted to a proper gear, and when the tested resistance value approaches to a true value, the resistance value is displayed and recorded, so that the static test of the circuit board is completed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. A static test system of a circuit board is characterized by comprising an attitude controller, a test unit, a controller and a mechanical arm with multiple degrees of freedom;
the controller comprises an attitude control module, an acquisition control module and a coordinate attitude storage module;
the test unit comprises a communication module and an acquisition module;
the mechanical arm is in signal connection with the attitude control module through an attitude controller;
the acquisition module is in signal connection with the acquisition control module through the communication module;
the acquisition module is arranged on the movable end of the mechanical arm.
2. The circuit board static test system of claim 1, wherein the robotic arm comprises a mounting base, a first joint, a second joint, a third joint, a fourth joint, a fifth joint, and a sixth joint, all of which are rotatably connected in sequence, along a fixed end to a movable end of the robotic arm.
3. The circuit board static test system of claim 1, wherein the collection module is a multimeter.
4. The circuit board static test system of claim 3, wherein the multimeter comprises a ground probe and a test probe respectively connected to the communication module, the test probe being disposed at a movable end of the robotic arm;
the grounding probe is connected with the ground, and the testing probe is connected with a point to be tested.
5. The circuit board static test system of claim 1, wherein the test probe comprises a needle, a shank, a tip, and a resilient member;
the needle point is arranged at one end of the needle rod, and the needle tube is sleeved at the other end of the needle rod and is connected with the needle rod through an elastic piece.
6. The circuit board static test system of claims 1-5, further comprising a coordinate aligner;
the coordinate aligner aligns to the point to be tested, the attitude controller acquires actual coordinate data and actual attitude data of the coordinate aligner and sends the actual coordinate data and the actual attitude data to the attitude control module, and the attitude control module sends the actual coordinate data and the actual attitude data to the coordinate attitude storage module for storage.
7. The static circuit board testing system according to any one of claims 1 to 5, wherein the coordinate positioner is a cross laser positioner, and the cross point of the cross laser generated by the cross laser positioner is aligned with the point to be tested.
8. The circuit board static test system of any one of claims 1 to 5, wherein the controller further comprises a difference subtraction module, and the posture control module is connected with the coordinate posture storage module through the difference subtraction module.
9. The circuit board static test system of any one of claims 1 to 5, wherein the controller further comprises a display unit connected with the communication module, and the communication module acquires the resistance value acquired by the acquisition module and sends the resistance value to the display unit for display.
10. A static test method of a circuit board is characterized by comprising the following steps:
step 1: the gesture control module acquires actual coordinate information of a point to be tested in a coordinate gesture table stored in the coordinate gesture storage module and actual gesture information of the mechanical arm;
step 2: according to the coordinate information and the posture information, the posture controller adjusts the posture of the mechanical arm, so that the acquisition module at the movable end of the mechanical arm is aligned to the point to be tested;
and step 3: the acquisition control module sends an acquisition signal to the communication module, and the communication module controls the acquisition module to acquire the resistance value of the point to be tested according to the acquisition signal, so that the static test of the circuit board is completed.
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