What are the PCBA test Fixture
PCBA test fixture is a very important equipment in PCBA processing plant, generally placed at the end of the production link, used to detect whether the product is in good condition. When making and testing PCBA test fixture, it is necessary to meet the specified requirements in order to improve the accuracy of the test and improve the quality of shipment.
PCBA test fixture is a kind of fixture which is used to test and test the function, power calibration, life and performance of the product. Because it is mainly used in the PCBA production line for the test of various indicators of the product, so it is called the PCBA test fixture.
PCBA test fixture classification
1.ICT test mainly includes circuit on-off, voltage and current values, fluctuation curves, amplitude, noise, etc.
2, FCT test needs to carry out IC program firing, the function of the whole PCBA board simulation test, find the problems existing in the hardware and software, and equipped with the necessary production fixture and test rack.
3, fatigue test is mainly to sample PCBA board, and carry out high frequency and long time operation of the function, observe whether there is failure, judge the probability of failure in the test, so as to feedback the working performance of PCBA board in electronic products.
4. Test in bad environment is mainly to expose PCBA board to the temperature, humidity, falling, splashing and vibration of the limit value, and obtain the test results of random samples, so as to infer the reliability of the whole batch of PCBA board products.
5. Aging test is mainly to energiize PCBA board and electronic products for a long time, keep them working and observe whether there is any failure fault. After aging test, electronic products can be mass-produced for sale
PCBA test fixture important item
1, according to the test requirements and test board, after choosing a good control mode, you can carry out the structure design of the fixture, you can design the loadboard, press plate, connector module, etc., the loadboard/press plate of the fixture is reasonable, and the corresponding protective measures are taken to avoid damaging the test board when testing the product.
2. The positioning of the jigs is accurate, and the docking of the connector should be smooth.
3. The layout of the fixture box is reasonable, and the space for wiring and installation of the control system is sufficient.
4, the optical fiber /MIC/SPK/SIM card analog insert position should be reserved, and the location of the accurate area.
5, fixture reserved interface position should be correct, sufficient, reasonable layout.
6. The locking of the fixture box should adopt the way of box buckle or pressure buckle to facilitate the replacement of parts and maintenance.
7, correct zero correction. The zero drift of test fixtures will change with the change of test conditions or different test fixtures, so the zero correction of open circuit and short circuit is very necessary. Therefore, the FCT test fixtures have open circuit and short circuit correction Settings.
8. When the fixture are broken and aging, they can be replaced for maintenance and continued use. If the fixture is damaged and cannot be repaired, and the customer changes it and does not use it anymore, it needs to be remastered.
PCBA test fixtures are generally customized for a particular product, which can effectively improve productivity and delivery quality.
PCBA test fixture production process
The production process of the test fixture is as follows:
1. According to the test requirements of the tested products and customers, the final fixture control mode should be selected to design, and the modules such as the pressure plate and the load plate should be designed.
2. The position of the pressure plate or the load plate of the fixture must be accurate in the design, so that the test plate can not be crushed when the product is tested.
3, the positioning of the test fixture should be accurate, and the connector should be smoothly connected.
4, the test fixture will have a certain design of a box, put the test products in the box, in the fixture design must keep enough space in the box, the layout of the box must be reasonable.
5. The reserved interface position of the test fixture should be correct, sufficient and reasonable.
After the completion of PCBA test fixture production, only need to put the PCBA board into the test fixture, can realize the positioning of the PCBA board and test fixture, the accuracy of the positioning and the production process of the test fixture has a great relationship.