Misunderstanding 7. Maintainability has nothing to do with me
The purpose of electronic product reliability work is to make profits, and the best way to make profits is to increase revenue and reduce expenditure. In terms of implementation difficulty, open source is relatively difficult, so we can change our thinking and take measures from reducing expenditure. The best way is to pay attention to maintainability. Saving this part of the cost can make your electronic products have a good reputation and profit. Why not do it?
Misunderstanding 8. If the process control is not good, there are no good craftsmen
Poor process control is not only a problem for technicians, but also a problem during the construction of the value chain. The requirements of the design project for the device, the manufacturer selection of the procurement engineer, and the control content of the inspection link should be designed according to the key indicators of the device. The failure mechanism and damage of components should not be introduced in the detection method, and the damage should not be introduced in the assembly process (wave soldering furnace temperature control, manual soldering station anti-static treatment, etc.). The factory inspection link should check some content that may cause product failure due to equipment parameter drift, and the maintenance link should not introduce faults. As can be seen from the above, only two process engineers can guarantee the solution of the problem. Therefore, it can be concluded that the specific method is to establish consistency. A prerequisite for consistency is that the designer provide sufficient primary and secondary technical information. The process is based only on design drawings and design documents to ensure manufacturing reliability, which is infinitely close to design reliability.
Misunderstanding 9. The relationship between the MTBF value and the failure rate of a single specific machine
MTBF is a macroscopic and statistical concept, while a single machine failure is a microscopic and specific concept.
Misunderstanding 10. Reliability problems can be solved by adding enhanced testing
Since this problem can be listed as one of the top ten misunderstandings, its definition is naturally wrong. There are three conclusions:
1. Some problems cannot be detected through simulation tests.
2. Test method = engineering calculation + specification review + simulation test + electronic simulation
3. The corresponding low temperature working time cannot be calculated through the results of the temperature strengthening test;
