Capacitance test fixture
By designing a capacitor test fixture based on the STM32 microcontroller, semi-automatic operation is achieved, which solves the problems of complex operation and low efficiency of existing capacitor test fixtures, improves test accuracy and reduces costs.
Patent Information
- Application Number
- CN202422532461.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-10-21
AI Technical Summary
Existing capacitance test fixtures are complex to operate, inefficient, and require high operator skills, and the test results are accidental.
A capacitance test fixture based on the STM32 single-chip microcomputer was designed. A semi-automatic solution was adopted to control the machine movement through the control board, cylinder and cylinder, and automatic testing was performed in combination with high-precision probes and a computer terminal to achieve modular design.
It reduces design costs, improves test efficiency and accuracy, simplifies operating procedures, reduces professional requirements for operators, and provides stable test results.
Smart Images
Figure CN223308281U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of capacitance testing, and in particular relates to a capacitance testing jig. Background Art
[0002] With the rapid development of electronic information technology, the replacement 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 ensure the quality of electronic products, it is necessary to perform functional testing on the motherboard and functional testing on the integrated circuit, which has become an urgent need.
[0003] When using existing capacitance test fixtures, professional operators are required to use LCR meters to test at corresponding points, and then upload the test results to the system and use professional multimeters for testing. This not only increases the cost and makes the test operation complicated, but also results in low test efficiency, high requirements for operators, and the test results are accidental. Utility Model Content
[0004] The purpose of the present invention is to provide a capacitance test fixture to solve the problems in the above background technology, such as complex test operation, low test efficiency, high requirements on operators, and random test results.
[0005] To achieve the above objectives, the present invention provides the following technical solutions: a capacitance test fixture, comprising: a test substrate, a shell cover mounted on the test substrate, a control board mounted on the test substrate, the control board being designed based on an STM32 single-chip microcomputer, providing general input and output ports, and controlling the machine operation by connecting sensors and solenoid valves, the control board being provided with a product placement area, and a steering column and a pressure rod being mounted on the product placement area;
[0006] A supporting assembly is provided below the test substrate.
[0007] Preferably, a computer terminal is installed on the test substrate, and the computer terminal test program controls the machine test and uploads the test results to the system. A power supply is provided on one side of the computer terminal.
[0008] Preferably, the computer end is connected to a switch, and the switch is connected to the test substrate.
[0009] Preferably, upper and lower cylinders and front and rear cylinders are installed on the control panel, and the upper and lower cylinders and front and rear cylinders can act on the product to be inspected.
[0010] Preferably, a gas spring is connected between the test substrate and the shell cover, and the gas spring is installed obliquely between the test substrate and the shell cover.
[0011] Preferably, the support assembly includes a bracket, a support plate and a heat dissipation plate, the bracket is located below the test substrate, the support plate is mounted on the bracket, and the heat dissipation plate is mounted on a side wall of the bracket.
[0012] Compared with the prior art, the beneficial effects of the present invention are:
[0013] (1) The present invention 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. The product will then start testing and upload the test results to the system.
[0014] (2) The utility model adopts a modular design, which effectively reduces the design cost.
[0015] (3) This utility model tests the basic parameters of capacitors on boards and cards. It has a professional design, a more competitive price, and stable testing performance, providing customers with a better choice. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural diagram of the utility model;
[0017] Figure 2 This is a schematic diagram of the structure of the utility model;
[0018] Figure 3 This is a schematic diagram of the structure of the test substrate of the utility model;
[0019] In the figure: 1. Test substrate; 2. Shell cover; 3. Control panel; 4. Product placement area; 5. Computer terminal; 6. Power supply; 7. Switch; 8. Upper and lower cylinders; 9. Front and rear cylinders; 10. Gas spring; 11. Bracket; 12. Support plate; 13. Heat sink. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0021] See also Figure 1-Figure 3As shown, the utility model provides the following technical solutions: a capacitance test fixture, comprising: a test substrate 1, a shell cover 2 is installed on the test substrate 1, a control board 3 is installed on the test substrate 1, the control board 3 is designed based on the STM32 single-chip microcomputer, provides a general input and output port, and controls the machine action by connecting sensors and solenoid valves, a product placement area 4 is provided on the control board 3, a steering column and a pressure rod are installed on the product placement area 4, a start button is provided on the test substrate 1, a code scanning gun is provided in the product placement area 4, and the code scanning gun is controlled by a program to realize automatic code scanning of the product during testing, the test substrate 1 uses multiple integrated circuit boards and a high-precision probe measuring instrument, with complete functions and high test accuracy;
[0022] A supporting assembly is provided below the test substrate 1 .
[0023] Furthermore, a computer terminal 5 is installed on the test substrate 1 . The test program of the computer terminal 5 controls the machine test and uploads the test results to the system. A power supply 6 is provided on one side of the computer terminal 5 .
[0024] Furthermore, the computer terminal 5 is connected to a switch 7 , which is connected to the test substrate 1 .
[0025] Furthermore, upper and lower cylinders 8 and front and rear cylinders 9 are installed on the control panel 3, and the upper and lower cylinders 8 and front and rear cylinders 9 can act on the product being inspected.
[0026] Furthermore, a gas spring 10 is connected between the test substrate 1 and the shell cover 2 , and the gas spring 10 is installed obliquely between the test substrate 1 and the shell cover 2 .
[0027] Through the above technical solution:
[0028] When in use, start the gas spring 10, open the shell cover 2, then place the product to be tested in the product placement area 4, press the start button with both hands, the control panel 3 controls the machine to start moving, the upper and lower cylinders 8 and the front and rear cylinders 9 work together to control the product to be sent to the machine test substrate 1, the steering column is used to provide precise positioning and guiding functions to ensure that the product to be tested maintains the correct direction and position during the test process, the pressure rod is usually used to apply vertical or specific direction pressure to the product to be tested, the probe on the test substrate 1 is connected to the product, and the test starts after the machine moves in place. The test substrate 1 can test current measurement and capacitance measurement, leakage current measurement: leakage current is a constant current that appears at a certain stage after the capacitor is charged. The fixture first charges the capacitor with a constant voltage and keeps After a period of time, the current flowing through the digital multimeter is measured to obtain the capacitor leakage current; Capacitance measurement: According to the characteristics of capacitance, when the capacitor is loaded with a constant current, the capacitor voltage changes linearly. The formula is as follows: I = C*(dU / dt), where I is the current, C is the capacitance value, and dU / dt is the change in voltage per unit time. After the capacitor is fully charged, an electronic load can be used for constant current loading, and then a digital multimeter can be used to measure the change in voltage per unit time on the capacitor to calculate the capacitance value. The computer terminal 5 and the switch 7 are convenient for converting and transmitting the detection data. A special test circuit is designed according to needs, with high test accuracy, which can realize high-precision testing of resistance, current and voltage, and test the capacitance value, leakage current and impedance of the corresponding point of the product.
[0029] For further information, see Figure 1-Figure 2 As shown, the support assembly includes a bracket 11 , a support plate 12 and a heat dissipation plate 13 . The bracket 11 is located below the test substrate 1 , the support plate 12 is mounted on the bracket 11 , and the heat dissipation plate 13 is mounted on the side wall of the bracket 11 .
[0030] Specifically, the bracket 11 provides physical support for the entire test fixture, ensuring that the fixture remains stable during the test and will not move or tilt due to external vibration or improper operation. The support plate 12 provides a stable platform for the capacitor, ensuring that the capacitor is fixed in position during the test and reducing test errors caused by movement. The heat sink 13 helps maintain the temperature stability of the test environment, especially in situations where precise control of the test temperature is required.
[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A capacitance test fixture, characterized in that: include: A test substrate (1), a shell cover (2) is mounted on the test substrate (1), a control board (3) is mounted on the test substrate (1), the control board (3) is designed based on an STM32 single-chip microcomputer, provides a general input and output port, and controls the machine movement by connecting a sensor and a solenoid valve, a product placement area (4) is provided on the control board (3), and a steering column and a pressure rod are mounted on the product placement area (4); A supporting assembly is provided below the test substrate (1).
2. The capacitance test fixture according to claim 1, characterized in that: A computer terminal (5) is installed on the test substrate (1). The computer terminal (5) controls the machine test through a test program and uploads the test results to the system. A power supply (6) is provided on one side of the computer terminal (5).
3. The capacitance test fixture according to claim 2, characterized in that: The computer terminal (5) is connected to a switch (7), and the switch (7) is connected to a test substrate (1).
4. The capacitance test fixture according to claim 3, characterized in that: The control panel (3) is provided with upper and lower cylinders (8) and front and rear cylinders (9), and the upper and lower cylinders (8) and front and rear cylinders (9) can act on the product to be detected.
5. The capacitance test fixture according to claim 4, characterized in that: A gas spring (10) is connected between the test substrate (1) and the shell cover (2), and the gas spring (10) is installed obliquely between the test substrate (1) and the shell cover (2).
6. The capacitance test fixture according to claim 1, characterized in that: The support assembly comprises a bracket (11), a support plate (12) and a heat dissipation plate (13); the bracket (11) is located below the test substrate (1); the support plate (12) is mounted on the bracket (11); and the heat dissipation plate (13) is mounted on a side wall of the bracket (11).