How do I measure conformal coating thickness on a circuit board when it is dry?
There are several techniques that can be adopted including micro section, using a micrometer screw gauge or measuring using an eddy current system like a positector.
Sectioning is clearly a destructive test and can be difficult, time-consuming and costly. The reality is that if you want a quick indication of the coating thickness on a circuit board then using a micrometer or an eddy current system is easier.
The key to both been successful is having enough flat surface to make the measurement. This isn’t automatic but for both techniques you need enough space to allow the points of contact to sit correctly. Then, the measurement is fairly straightforward.
If this space is not available then standard practice is to use a test coupon and coat that at the same time as the PCB. This will then give an indication of the coating thickness relative to the circuit board.
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