Why should PCB be cleaned?
When troubleshooting a non-functional or poor performance circuit, engineers can usually run simulations or other analysis tools to take the circuit from a schematic level. If these methods don't solve the problem, even the best engineers may be stumped, frustrated or confused. To avoid drilling into a similar dead end, I would like to introduce you to a simple and very important tip: keep it clean!
Some materials used in PCB assembly or modification can cause serious circuit functionality problems if the PCB is not properly cleaned. One of the most common problems in this type of phenomenon is flux .
Flux is a chemical used to assist in soldering components to a PCB. (oem pcb board manufacturer china) Unfortunately, if it is not removed after soldering, the solder will degrade the surface insulation resistance of the PCB, which will cause serious degradation of circuit performance in the process!
Flux contamination has a severe impact on the output performance of the bridge sensor. In the case of uncleaned or manual cleaning, the bridge sensor voltage never reaches an expected voltage of approximately VREF/2, even after an hour of stabilization time. In addition, uncleaned boards also exhibit a large amount of external noise collection.
In summary, improper solder cleaning can cause severe performance degradation, especially in high-precision DC circuits. For all manually assembled or modified PCBs, be sure to use an ultrasonic bath for final cleaning. After air drying with an air compressor, the assembled and cleaned PCB is baked at a slightly elevated temperature to remove any residual moisture.