HEIDENHAIN ERN rotary encoders have an integral bearing and a stator coupling. The shaft of the ERN is connected directly to the measured shaft. During angular acceleration of the shaft the stator coupling must absorb only that torque resulting from friction in the bearing. ERN rotary encoders therefore display a high dynamic performance and high natural frequencies.

Incremental signals - 1 Vpp 
Line count - 2048
Commutation signals - 1 sine and 1 cosine signal with 1 period per revilution (Z1-track)
Power supply - 5V
Operating Temperature - Max. 120C

Encoder Heidenhain ERN 1387
The encoder ERN 1387 is an incremental-type encoder. Incremental signals are sin-cos signals.
Technical
data
Line counts 2048
Power supply 5 V ± 5%
Current consumption (without load) ≤ 130mA