Why PCBA test?
The finished products processed by PCBA must pass the test and adjustment to meet the specified technical requirements. PCBA processing is just to assemble, connect and weld hundreds of electronic components according to the requirements of the design drawings. The characteristic parameters of each component inevitably have small differences. The comprehensive results will lead to large deviations in various performances of PCBA product circuits. In addition to the influence of various distributed parameters generated in PCBA processing, it is impossible to make PCBA complete circuit work normally after assembly, Make all technical indicators meet the design requirements. Therefore, PCBA test must be carried out.
Purpose of PCBA test
PCBA testing is to adjust and test PCBA according to the testing process to make it reach the functions and technical indicators specified in the technical documents. PCBA is not only an important process to ensure and realize the function and quality of electronic products, but also an important link to discover the design, process defects and deficiencies of electronic products. To some extent, PCBA test provides a reliable basis for technical performance parameters of electronic products.
Main contents of PCBA test
PCBA test mainly includes the adjustment of circuit parameters, that is, the adjustment of adjustable components of PCBA, the tuning system and mechanical transmission parts related to electrical indicators, to make them meet the predetermined performance requirements. On the basis of adjustment theory, the technical indicators of the whole machine are systematically tested to make the technical indicators of PCBA finished products meet the specified requirements. Specifically, the contents of PCBA test are as follows.
1. Specify the purpose and requirements of PCBA test.
2. Select and use test instruments correctly and reasonably.
3. Adjust and test PCBA according to the test process.
4. Use the basic theoretical knowledge of circuits and components to analyze and eliminate the faults during debugging.
5. Analyze and process PCBA test data.
6. Compile test summary according to the test results and put forward PCBA processing improvement suggestions.
For simple small PCBA processing, such as set-top box module, semiconductor radio module, etc., the testing work is simple. Generally, the whole machine can be tested directly after the assembly is completed, while for complex complete machines, such as automobile electronic control unit, the testing work is heavy. Generally, the single board or extension is tested first, after meeting the requirements, the final assembly is carried out, and then the whole machine is tested.
PCBA testing is generally carried out in the assembly workshop in strict accordance with the testing process. For relatively complex large-scale equipment, according to the design requirements, partial testing or rough adjustment can be carried out in the manufacturer, and then the final installation and comprehensive testing can be carried out in the installation site or experimental base according to the requirements of the technical documents.