Meaning
Physical interaction model describing the lateral movement of a probe tip as it penetrates a surface oxide layer to establish electrical contact. Understanding dynamic scrub mechanics allows engineers to predict the size of the mark left on a bond pad. This movement ensures that the metal-to-metal interface is clean and conductive.
Tip Interaction
Friction and beam angle govern the distance the probe travels across the target surface. The dynamic scrub mechanics rely on the downward force to generate a horizontal slicing action. This action removes non-conductive debris that would otherwise increase resistance.
Without this motion, the probe would simply sit on top of the insulating oxide. A controlled slide creates a fresh metallic interface for every touchdown.
Material Displacement
Soft metals like aluminum undergo plastic deformation during the testing process. Using dynamic scrub mechanics, the depth and length of the resulting trench are calculated to avoid puncturing the thin metal layer. Excessive travel can expose the underlying dielectric.
Contact Stability
Repeatable electrical performance depends on the consistency of the wipe action. The dynamic scrub mechanics of a specific probe design are verified through high-speed imaging during the initial qualification phase. Results from these tests inform the maintenance schedule for the test head.
