Specification: The device-ground interface material should have a spring constant, k, of 7000 ± 1000 N/m.
Method: Force-deflection test was performed. Known forces were applied to the curve and the resulting deflections were measured.
Acceptance Criteria: Spring constant between 6000 and 8000 N/m.
Result: Spring constants of 7349.1 N/m and 7723.8 N/m.
Outcome: Pass