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How to Choose an Encoder

Choosing an encoder by resolution, incremental/absolute, output type (HTL/TTL/SSI) and mechanical mounting.

4 min readUpdated: 2026-07-07

Encoder selection starts with the application's position accuracy and behavior on power loss needs. Is homing acceptable, or is absolute position required?

  • Resolution — required position accuracy (PPR/bit)
  • Type — incremental (homing) vs absolute (retains on power loss)
  • Output/interface — HTL/TTL, SSI, EnDat, EtherCAT
  • Mechanical — shaft/hollow-shaft, diameter, IP rating
In vibration/dirt-prone environments a magnetic encoder is more robust than optical; accuracy may drop slightly.

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