Importance of Polarized Light for PWB/PCB Inspection

M

Mgoul

#1
I have recently begun inspecting PWBS and PCBs. I find that polarized light is very helpful in finding/evaluating a variety of issues. However, I have been told that some facilities are not allowed to use polarized light for inspection purposes. This seems crazy to me since I believe there are defects we cannot detect without it.

I would like to hear your opinions regarding this topic.
 
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B

bazzle - 2012

#2
Not too sure of why , never seen anything saying not.

BUT.... to keep things equal and at a certain quality level inspection often stipulates a method.
ie. 5x magnification standard.
Now you can inspect at 10x but then you would be inspecting to a diff level.

Normal light source may be stipulated for GP inspection.
Polarized for a tighter level etc.

Bazzle
 
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