PCB News - What are the test methods for PCBA boards

What are the test methods for PCBA boards
All electronic components must be tested and inspected after they are made into finished products before they can be delivered to the buyer. The PCBA board is no exception. The current test methods mainly include the following five:

1, function test

Functional test is the earliest automatic test principle. It is a basic test method for a specific PCBA board or a specific unit, which can be completed by various test equipment. Functional testing mainly includes final product testing and the latest physical model.

2, flying probe test machine

Flying probe tester, also called probe tester, is also a commonly used test method. Due to the requirements of a test system with fast conversion and no fixture capability required for low-volume manufacturing with mechanical accuracy, speed and reliability, flying probe testing has become the best choice. The main advantages of the flying probe tester are that it is the fastest time to market tool, automatically generates tests, no fixture costs, good diagnosis and easy programming.

3, manufacturing defect analyzer

MDA is a good tool for diagnosing only manufacturing defects in a high-volume/low-mix environment. The main advantages of this test method are low initial cost, high output, easy follow-up diagnosis and fast and complete short-circuit and open-circuit tests; the main disadvantage is that functional tests cannot be performed, usually there is no test coverage indication, fixtures must be used, and the test cost is high. .

4, manual visual test

Manual visual test is to confirm the component placement of PCBA board through human vision and comparison. This technology is one of the most widely used online test methods. But with the increase in output and the shrinking of circuit boards and components, this method is becoming less and less applicable. Low upfront cost and no test fixture are its main advantages; at the same time, high long-term cost, discontinuous defect detection, difficulty in data collection, no electrical testing and visual limitations are also the main disadvantages of this method.

5. Automatic optical inspection

This kind of test method is also called automatic visual test. It is usually used before and after reflow. It is a newer method of confirming manufacturing defects. It has a better effect on the polarity of components and the existence of components. It is a non-electrical, fixture-free online technology. Its main advantages are easy follow-up diagnosis, easy program development and no fixtures; the main disadvantages are poor short-circuit recognition, and it is not an electrical test. The Internet era has broken the traditional marketing model, and a large number of resources have been gathered together to the greatest extent through the Internet, which has also accelerated the development speed of FPC flexible circuit boards, and then as the development speed accelerates, environmental problems will continue to appear in PCB factories. In front of him. However, with the development of the Internet, environmental protection and environmental informatization have also been developed by leaps and bounds. Environmental information data centers and green electronic procurement are gradually being applied to the actual production and operation fields.