PPR(Pulses Per Revolution) describes the number of high pulses an encoder will have on either of its square wave outputs A or B over a single revolution. While CUI Devices does not use PPR to represent Periods per Revolution, it would still technically be accurate as the duty cycle of our standard offering of incremental encoders is 50%. Once resolution is known it can be used to calculate how many mechanical degrees each pulse and period is equal to. 根据PPR确定角位移

术语“ PPR”在整个运动控制行业中并不普遍。

CPR通常代表每转计数，指的是两个输出A和B之间存在的正交解码状态的数量。由于输出A和B在高低之间切换，因此存在2位信息，表示为4个不同的状态。正交解码一词描述了同时使用输出A和B来计数每个状态变化的方法。这导致每个脉冲或每个周期存在的计数数量的4倍。因此，编码器的CPR是编码器的PPR乘以4。还应注意，一些编码器制造商使用CPR的首字母缩写来表示每转循环数。每转周期指的是编码器输出中任一输出的完整电周期或周期，等效于每转脉冲数。由于“每转计数”和“每转循环数”均使用相同的CPR首字母缩写，但相差4倍，这可以理解为会引起一些混乱，因此必须谨慎了解脉冲计数的定义方式。

LPR或每转线数是另一个与PPR等效的术语。 该线是指蚀刻或打印到光学编码器磁盘上的条。 光学编码器盘上的每一条线都具有一对一的关系，因此它们表示输出端的低脉冲。 Because resolution is defined differently across the industry, it is important to get the numbers into the same format when comparing products from different encoder manufacturers. This is best done by viewing waveforms or timing diagrams on the datasheet and if possible calculating the pulse width in degrees or arcminutes.

https://www.cuidevices.com/blog/what-is-encoder-ppr-cpr-and-lpr