Quality Assurance | A-tech Printed Circuit Board Fabrication China

QUALITY ASSURANCE

Quality is the life of an enterprise, and technology is the source of strength. "Pursue customer satisfaction" is the service tenet of A-TECH. A-TECH has a perfect quality certification system and a high-quality technical service team. The high quality of the PCB products has won good reputation not only in China but also in the world. What determines all this is A-TECH's long-term accumulation of high-precision technology, the most cutting-edge production system with stable supply, strict quality management at every link of the production line, and strict quality at each pcb manufacturing process by relying on high-precision design Inspection, as well as many professionally trained outstanding talents and cutting-edge production equipment.

How can we guarantee the quality of printed circuit board(PCB) we manufactured? Basically we use following treasures and processes to ensure that we always deliver high quality circuit board products to our customers. We are eager to the best pcb manufacturer in China.

Incoming Material Quality Control

All materials have to be inspected before warehousing. We established a series of strict inspection procedure and instruction to control the incoming materials. Furthermore, we own various precise inspecting instruments and apparatus to guarantee the capability to judge the material good or not. We issue material with first in first out principle and give out “alarm” for the material that will reach the shelf life to ensure the materials are used up before expiry.

Design Rules Check(DRC)

The DRC is a quite important step and in-depth review of your production data in PCB manufacturing, which is carried out by our experienced CAM engineers with GENESIS software before production of your printed circuit board. A comprehensive Design Rule Check helps to identify many errors in advance, thus avoiding problems and complaints. We also do the PCB manufacturing rule check to make sure the PCB design is manufacturable. If we find any errors we will get in contact with the customers.

Electrical Testing

The electrical testing(E-Test) for printed circuit boards is performed after manufacture. We use flying probe test for small volume and prototype PCB orders, but use E-Test fixtures to test production batch PCB orders. The tester will check for short circuits, open circuits and make sure the nets of the PCB we manufactured is the same as the nets in your design. PCB boards that are identified as defective are eliminated; defective PCB boards in panels are specially marked.

Automated Optical Inspection(AOI)

We use AOI to check both of inner layers of multilayer PCB and outer layers of various PCBs. This inspection is much more reliable and repeatable than manual visual inspection and it will guarantees the high reliability of multilayer circuit boards. AOI visually scans the surface of the PCB. The circuit board is lit by several light sources and observed by a scanner or by a number of high definition cameras. This enables the monitoring of all areas of the printed circuit board. AOI for a bare PCB board inspection will detect the features include:
•Line width violations
•Spacing violations
•Excess copper
•Missing pads
•Short circuits
•Cut traces or pads
•Hole breakage.

X-Ray

Testing the layer offset with X-ray technology is very important in the manufacture of multilayer PCB. X-ray images are the best (and only) way to identify and correct layer displacements in the pressing process.
Drill holes in multilayer PCB are also optimized using X-ray images. Any minor deviations in the geometry of the circuit board image compared to the geometry of the drill hole coordinates will be identified. By changing a correction factor within a clearly defined tolerance range, it can be ensured that the optimum drill reference point will be determined for each axis, with an optimal interpolation for all layers. These corrections take place in the µm range!

ISO9001:2015 and UL certified(UL No: E357001)

We’re ISO 9001:2015 certified PCB manufacturer. Our quality control system records the customer requirements and creates a system for communicating with customers about product information, inquiries, contracts, orders, feedback and complaints. Moreover, our quality control system is regularly audited and evaluated for conformance and effectiveness.
All our electronic board products comply with UL safety certification 94V-0. Our UL number is E357001. All our PCBs meet a flame rating 94V-0 and satisfy all UL requirements.
The other Reliability Testings before shipment as below, 1. Plating thickness testing
2. Thermal stress testing
3. Surface peelable testing
4. Impedance testing
5. 100% Visual inspection
6. Solderability testing
7. Ionic contamination testing
8. Metallographic microscopic analysis