Dielectric Proof
Dielectric proof is a destructive electrical stress screening applied during printed circuit board fabrication to verify insulation integrity under high voltage. High-potential test procedures subject internal laminate layers and dielectric barriers to potentials exceeding normal operating levels to precipitate latent manufacturing defects. Breakdown occurs when voids or contaminated resin paths allow current leakage across unintended clearance gaps.
Leakage Boundary
Leakage current monitoring during high-potential testing separates acceptable capacitive charging from localized insulation failure. Current thresholds must account for circuit board geometry and conductor spacing without masking actual dielectric breakdown. Limits are established during design qualification to prevent thermal damage in healthy substrates while detecting microscopic voids.
Stress Sequence
Stress application requires ramped voltage application to avoid transient surges that falsely trigger protective circuits during routine screening. Operators discharge residual charges safely following test completion to protect downstream electronic components from cumulative dielectric fatigue. Final electrical verification confirms insulation resistance remains stable across all tested conductor networks before assembly release.
