Surface Insulation Resistance Testing

Surface insulation reistance testing

Surface Insulation Resistance (SIR) is defined as the resistance, across the surface of the base material, between adjacent conductors of a Printed Circuit Board (PCB). On a typical PCB surface there are primarily four paths for current leakage between adjacent conductors; Through the air, Through surface Contamination, Along the surface, and Through the substrate. The …

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