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The PCBA test in the PCB circuit board type refers to the test of the pressure, IC burnout, voltage, current, and circuit continuity on the PCBA board. There are many uncontrollable factors in the PCBA production process. It is difficult to ensure that the production of PCBA is flawless. PCBA testing is a necessary link to strictly control the delivery quality.
PCBA Design
Inspection conditions for PCBA board
1. To prevent contamination of components or components, gloves or fingertips with EOS/ESD full protection function must be selected and static electricity rings must be worn for operation. The light source must be a white fluorescent lamp, and the light intensity must be above 100Lux, and it must be clearly visible within 10 seconds.
2. Inspection method: Place the sample to be tested at a distance of approximately 40cm from the two eyes, at a 45 º angle from top to bottom, left to right, and inspect it visually or with a triple magnifying glass.
3. Inspection criteria: (Sampling shall be conducted according to the QS9000 C=0 AQL=0.4% sampling level; if the customer has special requirements, it shall be determined according to the customer's acceptance standard)
4. Sampling plan: MIL-STD-105E LEVEL II normal single sampling
5. Judgment criteria: Severe defect (CR) AQL 0%
6. Main Disadvantages (MA) AQL 0.4%
7. Minor Disadvantages (MI) AQL 0.65%
What tests are mainly included in the PCBA test?
According to different products and different customer requirements, PCBA testing will be different. In general, PCBA testing mainly includes ICT online testing, FCT functional testing, and aging testing.
Second, the process of PCBA testing
PCBA testing generally develops a specific test process based on the customer's test plan. The basic PCBA test process is as follows: Program burning-ICT test-FCT test-aging test
1. Program burning
After the PCBA board completes the welding process of the front end, the engineer begins to program the microcontroller in the PCBA board to enable the microcontroller to achieve specific functions.
2. ICT test
The ICT test mainly uses the test probe to contact the test point of the PCBA to realize the test of the PCBA circuit open circuit, short circuit and the welding condition of the electronic components. The accuracy of the ICT test is relatively high, the instructions are clear, and the scope of use is relatively wide.
3. FCT test
FCT test can test the environment, current, voltage, pressure and other parameters of PCBA. The content of the test is relatively comprehensive, which can ensure that the various parameters of the PCBA board meet the design requirements of the designer.
4. Aging test
The aging test can ensure the stability of the product by continuously energizing the PCBA board, simulating the user's use scene, detecting some hard-to-find defects, and inspecting the service life of the product.
After PCBA has passed a series of PCBA tests, the PCBA board with no problem can be affixed with a qualified label, and finally it can be packaged and shipped. It means the related test of PCBA circuit board.
