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ATOM DX™ encoder series

The ATOM DX encoder series is Renishaw's smallest incremental optical encoder with digital output direct from the readhead, providing positional feedback, onboard interpolation, and filtering optics all in a miniature package.

ATOM DX builds on the market proven optical system of the ATOM™ encoder platform and integrates Renishaw's high-performance interpolation technology, reducing system size and removing the need for additional adaptors and interfaces. ATOM DX is suitable for the most space constrained applications where performance cannot be compromised.

Constructed with Renishaw's integrated set-up LED, for an intuitive and simple installation process based on the well established auto-calibration routine, ATOM DX is ready to install straight from the box. ATOM DX is compatible with the optional ADTi-100 Advanced Diagnostic Tool and ADT View software: they provide in-depth advanced diagnostic information to aid optimisation of encoder installation and in-field fault finding to satisfy the most demanding motion control applications.

ATOM DX readheads can be used with a wide range of linear and rotary scales to meet most application requirements, and comes in two formats: cabled and top exit variants with either 20 µm or 40 µm scale options.

Key features

Performance in a miniature head

ATOM DX fits into the smallest applications with heights as low as 7.85 mm. The top exit variant offers all the benefits and features of the cabled ATOM DX encoder, but in an even smaller package. The top exit variant is a component encoder with the cable assembly integrated separately to the readhead, making the ATOM DX top exit suitable for the smallest spaces.  

Performance in speed

ATOM DX encoders offer maximum speeds up to 20 m/s and a range of high-speed interpolation options.

Performance in velocity control

ATOM DX incorporates Renishaw's latest interpolation technology, with updated signal processing algorithms to reduce Sub-Divisional Error (SDE). This helps to reduce velocity ripple and improve closed loop feedback in motion control systems.

Scale options

  • Linear scales are used where straight-line position information is needed - usually X, Y or Z axes.
  • Rotary scales are used for angular position information and the motion control of rotating elements.

Glass spar 

Scale nameAccuracyScale pitch

Coefficient of thermal expansion

Supplied lengthReadhead compatibility
RCLCRCLC scale±3 µm20 µm/40 µm~8 µm/m/°C Up to 130 mmATOM DX

Stainless steel tape

Scale name


Scale pitch

Coefficient of thermal expansion

Supplied length

Readhead compatibility


RTLF20 scale

20 μm: ±5 μm/m

40 µm (high accuracy): ±5 µm/m
40 μm: ±15 μm/m

20 µm/40 µm

~10.1 ±0.2 µm/m/°C

Up to 10 m (>10 m on request)



Glass disc

Scale name

Graduation accuracy

(depending on ring


Scale pitch

Coefficient of thermal expansion

Disc diameter

Readhead compatibility


RCDM scale (scale page)

±0.5 µm

20 µm/40 µm

~8 µm/m/°C

17 to 108 mm