The second paragraph of Section 17.1 of the
TALON SRX Software Reference Manual says
The velocity units of a Quadrature Encoder is the change in Encoder Position per TvelMea
(TvelMeas=0.1sec). For example, if a US Digital Encoder (CPR=360) spins at 20 rotations per
second, this will result in a velocity of 2880 (28800 position units per second).