PCBA Tech - Why should PCBA be tested

1. In order to improve the qualified rate of products

With the improvement of product qualification rate, the through rate of products will be greatly improved. PCBA testing is a link in the whole production process of PCBA processing and an important means to control product quality.

2. For a better user experience

If conditions permit, every product needs basic tests, such as ICT, FCT, some tests, such as fatigue test, pressure test in harsh environment, aging test, sampling products that can only be tested, our heart will have a bottom. Only products that can stand the test will be liked by users. If problems are found in the testing process, we can also make timely correction and adjustment to make the whole product more complete and avoid serious consequences after the product is put on the market.

3. Inspection conditions of PCBA circuit board

1. In order to prevent parts from being polluted, you must choose EOS / ESD full protective gloves or fingertips and wear electrostatic rings. The light source is white or fluorescent. The light intensity must be above 100 lux and can be clearly analyzed and visible within 10 seconds.

2. Inspection method: place the product about 40 cm away from the eye, about 45 degrees up and down, and check it visually or with a triple magnifying glass.

3. Inspection standard: (according to the level of QS9000? Sampling = 0 and AQL = 0.4%; as the requirements of special customers, it is determined by the customer acceptance standard)

4. Sampling scheme: MIL-STD-105E class II standard single sampling

5. Criteria for judging inspection: serious defect (CR) AQL 0%

6. Main disadvantage (MA) AQL 0.4%

7. One minor defect (MI) AQL 0.65%

4. PCBA board inspection standard

1. Serious defect (expressed in CR): any defect sufficient to cause injury to people or machines or endanger life safety, such as non-compliance with safety regulations / machine burning / electric shock.

2. Main defects (expressed in MA): defects that may cause damage to the product, abnormal function or affect the service life of the product due to material reasons.

3. Minor defects (expressed in MI): it does not affect the function and service life of the product, there are defects in appearance, and there are slight defects or differences in mechanism assembly.