Every newly designed circuit board needs to be tested by testers before it can be officially put into production,
so a standardized testing process and standards are required. It can meet the basic testing requirements of circuit boards, making testing faster, standard, and convenient.
The following are the basic standards and procedures for circuit board testing
1. Testers need to confirm the design purpose of the “circuit board”,
understand the design needs and application scenarios of the circuit board based on the design purpose,
and plan the conditions and methods that need to be tested.
2. The tester cooperates with the developer to confirm that the PCB circuit board is consistent with the design schematic diagram to prevent meaningless testing waste because the actual test object is different from the designed one.
3. Confirm the position of the fixing holes of the circuit board, the size of the circuit board,
and the height of the components to see if the circuit board meets the requirements for normal installation.
4. Testers need to confirm whether the components are consistent with the bill of materials to prevent functional problems caused by different parameters on the components and design principles.
5. For each newly designed modified or upgraded sample test circuit board,
more than 5 identical circuit boards must be prepared to ensure the replicability of the circuit board and that the functions can be reproduced on the same circuit board.
6. The tester needs to ensure that each external port of the circuit board is reasonable,
that is, plugging and unplugging ensures that the wiring is firm,
and the operator’s operation is reasonable to prevent problems that cannot be connected.
7. Each circuit board needs to confirm the upper and lower limits of each power input to determine its input conditions and power.
8. The tester confirms all the input and output parameters of the circuit board,
the voltage of each voltage point, and the error range, and generates a test catalog to ensure that there will be no errors or missed tests during the test.
9. Confirm whether the position of each indicator light is correct and whether it is working properly.
10. Confirm the reasonableness of the location of the program writing port and ensure that the programming plug can be inserted normally to write the program.
11. Detect the temperature changes of all components on the circuit board when the circuit board is in the normal working environment to ensure that it can work normally and will not exceed the operating temperature of the components.
12. Carry out tests based on the test situation and record the problems that arise during the test. If the circuit board is upgraded on the original basis,
it must be confirmed whether its original normal functions are working properly and fed back to the designer for rectification.
13. After passing the test, the tester needs to write a test report and keep the test file for subsequent testers and technical personnel to understand.
14. After completing the test, transfer the schematic diagram, PCB, material list,
and test report to the technical department so that the technical department can prepare technical documents,
debug the process, and instructions, and arrange small batch production.
15. Arrange small batch testing and aging testing to ensure the repeatability and normal function of the circuit board,
and to ensure normal operation for a long time. Conducting high and low-temperature tests to confirm the extreme working environment of the circuit board
16. After passing batch testing, it will be put into formal production.