Don’t take the temperatures as gospel as emissivity is not adjusted to the material. The exposed metal plates are of different material and shows lower temperature.
Temperatures are about 5 degs higher on the image than my Fluke K-Type probe says - so real temperatures is somewhere in between
But temperatures in general are very even all over. There a much less difference compared to what I expected. So well designed!
Is it normal that he exposed metal plates are not shown as the same temperature ?
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yes - measured temperature depends on material you measure. Shiny/reflective surfaces have a different reflection of heat vs matte surfaces. That is why you can change settings for emissivity on all IR temperature measurement devices.
[quote name=The6uest]Hmm, I guess that’s why sometimes the raft sticks well to the white part of the PCB but not as good to the exposed metal part.
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Temperature is not different on the shiny surfaces - just looks different due to the way IR measurements work.
[quote name=pilou74]Oooohhhh… Now I know why my IR temperature gun gives weird info when I point at reflective materials !!
Thanks
It says 85degC on the white surface and 75degC on the reflective metal.
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Yes - on any IR measurement device you need to adjust for the material you measure. Most IR “guns” can be adjusted in a " Material" menu. Here is a list of common values for different materials: Material table for IR measurements
Images are made with my Flir E4 - that has been hacked to 320x240 resolution. (A $995 device - “hacked” to a $6000 device) - Hack so far only works on Firmware < 1.21 - so if you go and buy one - check firmware FIRST or get full rights of return…) - hack takes about 3 minutes and is non intrusive Check EEVBlog forum for more info.
