sales@ipcb.com
PCBA test fixture (also known as ‘test rack’) in the PCBA manufacturing process is very common, its main function is to undergo the SMT chip and DIP plug-in process after the implementation of the PCB board test, in which ICT test occupies a dominant position. The test through the test point to check the electrical connectivity of the circuit board, and then judge the welding quality of the whole PCB board is qualified. The PCBA test fixture, is the implementation of this test task is a key tool to assist.
The working principle of the PCBA test fixture is very intuitive, it uses metal probes and PCB board pads or test points to connect, in the state of the PCB board is energised, the collection of test circuit voltage. Current and other key parameters, in order to determine whether the measured circuit is on without error.
The production of PCBA test fixtures are customised services, the design is based on the size of the PCB board to be tested. The specific location of the test point and the need to measure the value. In the production process, the main choice of acrylic. Plastic material, with metal probe. Display. Wire and simple PCB circuit board components, to complete the production of the entire fixture.
Common PCBA test fixtures
1. ICT test fixtures
ICT test mainly contains the circuit on and off. Voltage and current values and fluctuation curves. Amplitude. Noise, etc.
2. FCT test fixture
FCT test requires IC programme burning, simulation test on the function of the whole PCBA board, to find out the problems in hardware and software, and equipped with the necessary production fixtures and test racks.
3. Fatigue test fixtures
Fatigue test is mainly on the PCBA board sampling, and function of high-frequency, long-time operation, to observe whether there is failure. Prolonged operation, to observe whether there is failure, judge the probability of failure test, so as to provide feedback on the working performance of the PCBA board within the electronic product.
4. Environmental test equipment
Harsh environment test is mainly exposed to the PCBA board in the limit value of temperature. Humidity. Drop. Splash. Vibration, to obtain random sample test results, so as to infer the reliability of the whole batch of PCBA boards.
5. Aging Test Equipment
Aging test is mainly PCBA boards and electronic products for a long time to power, keep it working and observe whether there is any failure failure, after aging test electronic products can be sold in batches.
PCBA test fixture production process
Material Preparation
According to the design scheme to determine the need to prepare the hardware components (electronic devices), as well as related peripheral circuits. Equipment, and frame materials (such as acrylic board). Adhesive. Electric screwdriver. Screws. Wire and other materials to ensure that all the production of the required information is complete.
Determine and check the structure of the test frame
Determine the structure of the test rack and check it carefully.
Wiring specification
1. The wire opening should be controlled within 2mm, and tin should be added to the wire opening and test pin tin line position in advance.
2. Welded wires should be stable, without shaking or loose phenomenon.
3. Strong and weak wires in the test frame should be separated and fixed with wire ties.
4. The connectors of ammeter and voltmeter must be installed with multimeter pens, and it is forbidden to use banana plugs to test current, voltage and other functions. Voltage and other functions of the test to ensure the safety of the operator.
5. The signal line of the high-frequency product model must use shielded wire and ensure that the external network is safely grounded.
6. If the test frame contains a transformer, the transformer shell must be grounded.
7. Test racks are required to install fuses, not with wires or other wires instead. Need to remove the original plug 13A fuse, and according to the current requirements of the test model to replace the fuse, replacement principle for the product working current 8-10 times.
Selection of quality testing standards
The selection of points should follow the principle of comprehensiveness, effectiveness and economy. The principle of effectiveness and economy.
The use of PCBA test frame
PCBA test fixture is widely used in PCBA processing and production process, mainly used to complete the SMT chip and DIP plug-in after the PCBA board for testing. Among them, ICT test is its main test mode, through the test point to detect the electrical conductivity of the circuit board, so as to judge whether the welding quality of the whole PCB board is qualified.PCBA test rack is an important tool to assist in completing this test.
PCBA test fixture as an indispensable part of the electronic manufacturing process, its importance is self-evident. Through accurate design and customised production, PCBA test fixtures can efficiently complete various testing tasks on PCB boards, ensure product quality and improve production efficiency.