What is the difference between cpr and ppr?

With incremental outputs it is important to know the difference between PPR (pulses per revolution) and CPR (counts per revolution = 4 x PPR)

Pulses per revolution is the number of pulses in one revolution.

Counts per revolution is the number of changes of state on both channels in one revolution. CPR is achieved by electronically multiplying by four, using both the rising and the falling edges on both channels.

1 Pulse = 4 Counts