In a Micro Electro-Mechanical System switch, a common switch failure is a short between the upper and the lower electrostatic actuation plates. It defines a first direction parallel to a longitudinal axis of the shaft, a second direction perpendicular to the first direction and parallel to a plane in which strings extend mounted in the frame, and a third direction perpendicular to the first and second directions and the plane of the strings. A calibration current is conducted through a transistor connected in series with a variable value resistance in the integrated circuit at the circuit node. A snapshot of the table is obtained after the last DML transaction commits.