What term describes the number of positions an actuator will assume when the control signal is varied?

The term that describes the number of positions an actuator will assume when the control signal is varied is resolution. This concept refers to the smallest change in input that can lead to a discernible change in the actuator's output position. In the context of control systems, a high resolution indicates that the actuator can make fine adjustments and accurately follow control signals, resulting in smoother and more precise control over the system it is managing.

Understanding resolution is important for ensuring that actuators effectively perform their intended roles, especially in applications where precision is crucial. Conversely, sensitivity generally pertains to the responsiveness of the actuator to changes in control signal rather than the number of discrete positions it can assume. Calibration involves adjusting the device to ensure accuracy within its operational parameters, but it does not define the range of positions. Output range refers to the total span of positions an actuator can achieve but does not specifically reference the granularity or precision of those positions, which is what resolution captures.