A method that provides increased flexibility to measure dynamic range of a rotating
system is provided. The method includes the steps of: providing a first rotating
member; providing a second rotating member suitably engaged to the first rotating
member; providing a set of sensors disposed to sense variations in characteristics
along a circumference of the first member and the second member respectively; providing
a controller for receiving information sensed by the sensors; determining a rate
of rotation of the rotating members; selectively using the sensed information thereby
at different rate of rotation different amount of the sensed information is used.