The purpose of the electrical performance test is to check whether the produced pcba product is working properly and without errors. Among the defects that affect the function of pcba products through electrical performance inspection, the contents directly related to PCB soldering include two aspects, namely, poor component and poor conduction.
Poor components in the board are damage caused by soldering. Poor conduction includes open circuit, short circuit, and intermittent conduction. In particular, there are still examples of defects that affect the performance of pcba products that are not found during visual inspection, but can be detected in electrical performance tests. For example, it is possible to detect minute cracks in the welded portion which cannot be found by the visual inspection and extremely fine solder bridging defects on the printed circuit board.
If the components inserted in the printed circuit board have tiny cracks at the root of the lead, there is no abnormality in the circuit for a short time after the power is turned on, but after several tens of minutes, the circuit will be broken, or after a while. Pass, this phenomenon repeats. In the case of this phenomenon, the "vibration test method" can be used, that is, the printed circuit board is lightly tapped with a small rubber hammer, and the presence or absence of abnormality is checked by observing the waveform on the picture tube or listening to noise.
Electrical performance test If the component is damaged, the component needs to be replaced; if the electrical conductivity test is not good, it needs to be repaired.