Dry Heat Proves Hazardous to PCB Assembly

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richbuyer
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well said!
richbuyer   4/8/2016 3:55:39 PM
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Great article, thnx!

gujutras
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Consider human comfort in RH bounding
gujutras   4/8/2016 3:22:56 PM
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From an ESD perspective, low RH is acceptable if you have an ESD program in place such as ANSI S20.20.  Surface resistivity of materials evaluated by the ANSI/ESD S7.1  methodology will be conditioned at 12% RH for 72 hours before measurement.  This approach is applicable to all sorts of materials.  This emphasizes the importance of using   properly grounded dissipative materials for flooring, shoes, workstation surfaces, packaging and transport materials on the production floor.  If you cannot avoid using  materials prone to triboelectric charging effect, then a mitigating approach is to neutralise them with an ioniser.  Now from a human comfort perspective, I suspect ASHRAE recommendations will not go as low as 12%RH and this should bound your minimum RH conditions.



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