Evaluation pattern

For tests aiming only to evaluate the reliability of basic functions, a test sample composed of just the targeted function should be evaluated, rather than evaluating the product itself. Limiting functions enables characteristic changes to be investigated with high-precision measurement, and enables detailed investigation of the effects of design parameters. Continuous measurement during environmental testing has therefore become common as a reliability test method. It is often used for purposes of R&D or design evaluations. Some typical examples presented in standards are given here for the purpose of mounting reliability.

Flexible board for surface insulation resistance (ion migration) evaluation

Evaluating the CAF(conductive anodic filament)
(Refer to IPC TM650 2.6.25)
   *What is CAF?

For through hole evaluation

For solder joint reliability evaluation
(Chip parts)

For solder joint reliability evaluation
(Upper: QFP
Lower: BGA)

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