Board card DCR test fixture

Abstract

The utility model discloses a board card DCR test fixture, which belongs to the technical field of detection devices and comprises a base, a workbench is arranged at the top of the base, a moving platform and a test module are arranged at the top of the workbench, a probe module is arranged on one side, close to the test module, of the moving platform, a control button is arranged on the base, and the control button is electrically connected with the moving platform and the probe module. The board card is fixed through the arranged test module, and the mobile platform drives the probe module to move, so that the probe module moves to the detection point of the board card, the test of the board card is completed, compared with manual test, the efficiency is higher, the precision is higher, and the practicability of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of detection devices, in particular to a board card DCR test fixture. Background Art

[0002] With the rapid development of electronic information technology, the speed of digital electronic products is getting faster and faster, electronic products are becoming more and more popular, and their functions are becoming more and more diverse. At the same time, in order to improve the performance of electronic products, the complexity of integrated circuits on the motherboard is also increasing. At the same time, before the product is released, the motherboard needs to be functionally tested, and functional testing of integrated circuits has become an urgent need.

[0003] In the prior art, the commonly used detection method is that professional operators use a multimeter to test the corresponding points, and then the operators upload the test results to the system. However, this test method requires the use of a professional multimeter for testing, which is costly; the test operation is complex and the test efficiency is low; the professional and technical requirements of the operator are high, and the test results are accidental; and when manual testing is used, for complex motherboards, the manual detection has low accuracy and efficiency, and is prone to missed detection, which has a certain impact on the quality of the product. For this reason, a board DCR (DC Resistance) test fixture is proposed. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a board DCR test fixture, which has higher accuracy and efficiency than manual detection, and is conducive to improving the practicability of the device.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a board DCR test fixture, comprising a base, a workbench is fixedly installed on the top of the base, a mobile platform is fixedly installed on one side of the top of the workbench, a test module is fixedly installed on the other side of the top of the workbench, a probe module is fixedly installed on the side of the mobile platform close to the test module, and a plurality of control buttons are provided on the base, and the control buttons are electrically connected to the mobile platform and the probe module.

[0006] Preferably, the mobile platform includes a first slide rail fixedly installed on the top of the workbench, a first slide is slidably connected to the top of the first slide rail, a vertical plate is fixedly installed on one side of the top of the first slide, a second slide rail is vertically fixedly installed on the vertical plate, an L-shaped plate is slidably connected to the second slide rail, a cylinder is fixedly installed on the L-shaped plate, a mounting plate is fixedly installed on the output end of the cylinder, a third slide rail is fixedly installed on the top of the mounting plate, a second slide is slidably connected to the third slide rail, and the probe module is fixedly installed on the second slide.

[0007] Preferably, the installation direction of the first slide rail is parallel to the length direction of the workbench, and the installation directions of the cylinder output end and the third slide rail are consistent with the installation direction of the first slide rail.

[0008] Preferably, a protective cover is fixedly mounted on the top of the base by means of buckles, and the workbench is located inside the protective cover.

[0009] The working principle of the board DCR test fixture of the utility model is as follows: placing the board to be tested on the test module, pressing the control button on the base, starting the movement of the mobile platform and the probe module, testing the board on the test module, controlling the first slide, the mounting plate, and the second slide to move toward one side of the board on the test module, so that the output end of the probe module is located above the board, and the L-shaped plate moves downward again, so that the output end of the probe module contacts the detection position on the board, the first slide cooperates with the first slide rail to cope with the movement with a larger span, the second slide cooperates with the third slide rail to fine-tune the position of the probe module, and the cylinder drives the mounting plate to move to ensure the accuracy of the movement, so as to realize the detection of the board.

[0010] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0011] 1. Fix the board by the test module set on the top of the workbench, and control the button to drive the mobile platform and the probe module to move, so that the probe module contacts the detection point on the board to detect the board. The mobile platform changes the position of the probe module so that the probe module detects multiple detection points on the board. Compared with manual detection, the detection efficiency and accuracy are higher, which is conducive to improving the practicality of the device.

[0012] 2. By setting the mobile platform to three sections of lateral movement and one section of up and down movement, large-range movement, position fine-tuning and precise position control can be achieved, making the position control of the probe module more precise and flexible, further improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of a board DCR test fixture in the embodiment;

[0014] Figure 2 This is a schematic diagram of the workbench structure of a board DCR test fixture in the embodiment;

[0015] Figure 3 A board DCR test fixture in the embodiment Figure 2 A schematic diagram of the structure shown;

[0016] Figure 4 This is the test schematic diagram of the board DCR test fixture;

[0017] Figure 5 This is the test block diagram for the board DCR test.

[0018] Among them: 1. Base; 2. Protective cover; 3. Workbench; 4. Mobile platform; 41. First slide rail; 42. First slide table; 43. Vertical plate; 44. Second slide rail; 45. L-shaped plate; 46. Cylinder; 47. Mounting plate; 48. Third slide rail; 49. Second slide table; 5. Test module; 6. Probe module. DETAILED DESCRIPTION

[0019] The following is attached to the instruction manual Figure 1-5 , the technical solution of the utility model is explained through specific embodiments.

[0020] Embodiment:

[0021] like Figure 1-3 As shown, it is a schematic diagram of the overall and specific structure of the board DCR test fixture of the utility model. The board DCR test fixture includes a base 1, a protective cover 2 is fixedly installed on the top of the base 1 through a buckle, a workbench 3 is fixedly installed on the top of the base 1, the workbench 3 is located in the protective cover 2, a moving platform 4 is fixedly installed on one side of the top of the workbench 3, a test module 5 is fixedly installed on the other side of the top of the workbench 3, and a probe module 6 is fixedly installed on the side of the moving platform 4 close to the test module 5.

[0022] like Figure 3 As shown, the mobile platform 4 includes a first slide rail 41 fixedly installed on the top of the workbench 3, a first slide 42 is slidably connected to the top of the first slide rail 41, a vertical plate 43 is fixedly installed on one side of the top of the first slide 42, a second slide rail 44 is vertically fixedly installed on the surface of the vertical plate 43, an L-shaped plate 45 is slidably connected to the second slide rail 44, a cylinder 46 is fixedly installed on the top of the L-shaped plate 45, a mounting plate 47 is fixedly installed on the output end of the cylinder 46, a third slide rail 48 is fixedly installed on the top of the mounting plate 47, a second slide 49 is slidably connected to the third slide rail 48, and the probe module 6 is fixedly installed on the second slide 49 close to the test module 5.

[0023] It should be noted that the installation direction of the first slide rail 41 is parallel to the length direction of the workbench 3 , and the installation directions of the output end of the cylinder 46 and the third slide rail 48 are consistent with the installation direction of the first slide rail 41 .

[0024] The base 1 is provided with a plurality of control buttons, which are electrically connected to the mobile platform 4 and the probe module 6 .

[0025] Working steps: First, place the board to be tested on the test module 5, and press the control button on the base 1 through the test program of the corresponding board preset in the base 1 to control the movement of the mobile platform 4, and transport the probe module 6 to the top of the board to be tested, and test the board. The mobile platform 4 can move in a large range. When the probe module 6 is sent to the side of the test module 5 and reaches the top of the board, the first slide 42 moves on the first slide rail 41, and the structure on the top of the first slide 42 is moved to the side of the test module 5. The second slide 49 is on the third slide rail 48. The probe module 6 moves upward to make the probe module 6 reach above the detection position of the board on the test module 5, and the L-shaped plate 45 slides up and down on the second slide rail 44 to make the output end of the probe module 6 contact with the detection position of the board to detect the board. When changing the detection position, the L-shaped plate 45 is first reset, and the cylinder 46 drives the probe module 6 to move, and after driving the output end of the probe module 6 to another detection position on the board, the L-shaped plate 45 slides on the second slide rail 44 again, driving the output end of the probe module 6 to contact with the detection position of the board, and repeating the above steps until all the detection of the board is completed.

[0026] like Figure 4 As shown in the figure, it is the test principle diagram of the board DCR test fixture. The DCR test uses the four-wire method to measure resistance. The four-wire method is also called the four-terminal Kelvin detection or the four-point probe method. It is a precision impedance measurement technology. A pair of test wires are connected to the current source, and another pair of test wires (sensing wires) introduce the voltage drop on the measured resistor into the multimeter for measurement. The current source and the measured resistor R, the test wire resistors R1 and R4 form a loop, but the voltage sent to the two ends of the multimeter includes the voltage at both ends of the measured resistor R, and the voltage at both ends of the sensing wire resistors R2 and R3. However, R2 and R3 have little effect on the measured voltage, so the measurement accuracy is improved.

[0027] like Figure 5 As shown in the figure, it is a test block diagram. In the present utility model, the test board system consists of 7 parts:

[0028] The first part is Base_Board, which is a board customized according to test requirements. MCU, CC_Source_Board, Power, PC, Probe and El cetronic ControlBoard are connected through Base_Board to form a unified test system, which implements DCR tests on different parts by switching test paths;

[0029] The second part is the El cetronic Control Board, which is designed based on the STM32 microcontroller and provides general input and output ports. It controls the machine movements by connecting sensors and solenoid valves.

[0030] The third part is the Probe, which is used to connect the product to be tested to the test fixture of the utility model;

[0031] The fourth part is CC_Source_Board, which can provide 6 constant current sources: 1uA, 10uA, 100uA, 1mA, 10mA, 100mA. Its function is to provide constant current source when performing DCR test.

[0032] The fifth part is MCU, which is designed based on STM32 single-chip microcomputer. By adding its peripheral circuit, it can realize the voltage test. At the same time, it can realize the control of Base_Board through IIC communication.

[0033] The sixth part is Power, which provides a constant voltage source to power the test fixture. To ensure safety, the power supply supports emergency stop and cuts off the power supply in an emergency.

[0034] The seventh part is PC, i.e. the computer side. The computer side test program controls the machine test and uploads the test results to the system.

[0035] During the test, the El cetronic Control Board controls the machine to start moving and connects the probe to the product. After the machine moves in place, the test starts. The test program sends instructions to the MCU, and the MCU controls CC_Source_Board to provide a constant current source. At the same time, the MCU measures the voltage value. According to Ohm's law, the current I and voltage V are known, R = V / I, and the resistance value is calculated, thus completing the test process.

[0036] Compared with traditional testing technology, the testing fixture of the utility model has the advantages of small size, low cost and high precision.

[0037] The original technology is based on manual testing, and there are differences in measurements made by different people. The data obtained is not accurate enough, and its testing efficiency is low, making it unsuitable for industrial applications. This product uses a semi-automatic testing solution. The tester only needs to place the product to be tested in the designated location and press the start button with both hands. This product will start testing and upload the test results to the system.

[0038] Aiming at the shortcomings of the original technology, which is high cost and poor effect, the utility model adopts customized boards and modular design, which effectively reduces the design cost.

[0039] All the shortcomings of the original technology have been improved, and the advantages of the new technology in continuous product testing are more obvious. The utility model performs DCR testing on boards and cards, has a small size, a more competitive price, and stable testing performance to provide customers with a better choice.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A board DCR test fixture, comprising a base, characterized in that: A workbench is fixedly installed on the top of the base, a mobile platform is fixedly installed on one side of the top of the workbench, a test module is fixedly installed on the other side of the top of the workbench, a probe module is fixedly installed on the side of the mobile platform close to the test module, and a plurality of control buttons are provided on the base, which are electrically connected to the mobile platform and the probe module.

2. The board DCR test fixture according to claim 1, characterized in that: The mobile platform includes a first slide rail fixedly installed on the top of the workbench, a first slide table is slidably connected to the top of the first slide rail, a vertical plate is fixedly installed on one side of the top of the first slide table, a second slide rail is vertically fixedly installed on the vertical plate, an L-shaped plate is slidably connected to the second slide rail, a cylinder is fixedly installed on the L-shaped plate, a mounting plate is fixedly installed on the output end of the cylinder, a third slide rail is fixedly installed on the top of the mounting plate, a second slide table is slidably connected to the third slide rail, and the probe module is fixedly installed on the second slide table.

3. A board DCR test fixture according to claim 2, characterized in that: The installation direction of the first slide rail is parallel to the length direction of the workbench, and the installation directions of the cylinder output end and the third slide rail are consistent with the installation direction of the first slide rail.

4. The board DCR test fixture according to claim 1, characterized in that: A protective cover is fixedly mounted on the top of the base through buckles, and the workbench is located inside the protective cover.

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