Angles can be measured using analogue or digital methods.
- Analogue methods include rotating condensators, the capacity of which is a measure of the angle of rotation or a rotating potentiometer. Tacho generators also issue a voltage depending on the angle of rotation.
- The digital angle measurement uses angle encoders or incremental angle of rotation sensors, but also Selsyn rotary position encodersresolvers, Synchro rotary position encoders) are rotatory digital measurement systems.