On the contrary, two-sensor systems ("two-legged"), typically used by the competition, inexorably, require at least one mechanical constraint for stability. In this case, the presence of one or more mechanical constraints alters the response of the imbalance detection system, since the centrifugal force is not completely discharged through the sensors but, at least in part, also passes through the constraint. For this reason, two-sensor systems are required to "parameterize" the system, taking into account the constraint, which may be affected by temperature variations, or may simply vary due to the replacement of mechanical parts of the system, etc. In short, for two-sensor systems, a simple self-calibration of the system is not enough, but what is called "factory calibration" is needed.
In the VQI FASEP system, the centrifugal force developed by the imbalance "discharges" entirely through the sensors and there is no external mechanical constraint. The centrifugal force, i.e. the imbalance, is therefore completely known at the time of processing by the computer and this means the certainty that in any condition and with any type of wheel, small or large, the results will always be perfect.