IPC-JEDEC-9704A

Testing Protocol

Technicians bond foil strain gauges directly onto the printed circuit board near high-risk components using specialized adhesives and cure the bond line under strict thermal controls. DAQ systems sample voltage changes across the Wheatstone bridge circuit at high frequencies during physical stress events, capturing transient peak deformations that occur in milliseconds. Software filters remove high-frequency noise from the raw waveforms before engineers analyze the maximum principal strain and strain rate values against established pass criteria.

Equipment operators calibrate every sensor channel prior to testing and verify bridge balance to ensure repeatability across multiple production runs and different manufacturing facilities.

Production Threshold

Production engineers adjust mechanical separation tools and pneumatic clamps when strain readings approach the allowable boundary defined for specific package types and board thicknesses. Ceramic column grid arrays and large ball grid array packages present higher fracture risks under dynamic loading than smaller discrete components, requiring tighter operational margins during final assembly handling. Process adjustments reduce mechanical shock transmitted through the assembly fixture, preventing structural damage to internal traces and solder interconnections without slowing down throughput rates.