Let NL/H be the number of counters per revolution, T1 be the time in seconds between the two consecutive L/H transitions. What is the rotational rate of the disk in Hz?

V = ∆N/T

Explanation:

Rotational Rate is defined as the number of rotations an object moves in a period of time.

= Rotations/time = distance/time = velocity

V = ∆f

Where f = N/T1 where N is the number of cycle per time

T1 be the time in seconds between the two consecutive L/H

∆ is the distance in meters between the two consecutive L/H.

Therefore we have V = ∆N/T1