Control Resolution
It is the speed change corresponding to the smallest meaningful movement of the control element. When the potentiometer's whole turn is spread over a wide range, every degree means a large jump in speed; when the range is narrowed, the same movement corresponds to smaller steps and the adjustment becomes finer. This is the real gain of calibration.
Let us look at an example. Say the usable angle of the potentiometer is about 270 degrees. If this turn is spread between 800 and 2400 rpm, each degree amounts to roughly 6 rpm. If the same turn is spread between 1200 and 1800 rpm, it comes down to about 2.2 rpm per degree. Even if the operator's hand is equally steady, in the second case they can adjust about three times more finely.
That is why, after teaching the upper limit on the GS740-3P, users feel that the potentiometer has become finer; the system has not become more precise, the range has been narrowed.
The limit of resolution is set by other factors. Noise in the control signal, friction hysteresis in the cable and free play in the throttle lever joint prevent you from going below the theoretical resolution. The GS740-3P's AS5600 encoder divides 360 degrees into 4096 steps; that is, on the actuator side the position resolution is in practice far below the uncertainty coming from the mechanics.
Context in which this term is used: Electronic speed and throttle control on a diesel engine