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ATOM DX™ incremental encoder system with CENTRUM™ CSF40 rotary (angle) disc


  • Digital output direct from the readhead
  • Readhead size: 20.5 x 12.7 x 10.85 mm (20.5 x 12.7 x 7.85 mm for top exit variant)
  • Resolutions down to 5 nm
  • Speed up to 20 m/s
  • Stainless steel self-centring disc


  • Miniature package
  • No separate interface required
  • Filtering optics design enabling high dirt immunity
  • Advanced Diagnostic Tool for easy fault finding
  • Robust metal scale disc with innovative alignment flexures
  • Fixing options: bolts or clamp
  • Quick and easy to install
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What is ATOM DX?

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

Detailed diagnostic information can be accessed by using the optional Advanced Diagnostic Tool ADTi‑100 and ADT View software for in‑field diagnostics, fault finding and to aid optimisation of encoder set-up in even the most demanding applications.

ATOM DX for CENTRUM is supplied in cabled and top exit variants with a 40 µm scale option, and offers resolutions down to 5 nm.

What is CENTRUM™ CSF40?

CENTRUM CSF40 is a stainless steel encoder scale disc. It includes innovative alignment flexures that automatically centre the scale when pushed onto a shaft, providing improved metrology performance.

CENTRUM self-centring scale discs are quick and easy to install 'right first time': no additional gauges or set-up devices are required.

The discs are made from robust stainless steel, which is resilient and easy to clean.

With 40 µm pitch incremental graduations, CENTRUM discs are available in a range of sizes and fixing options. For custom disc sizes, please contact your local Renishaw representative.

Why choose this encoder system?

Miniature encoder for space critical applications

ATOM DX, available in sizes as small as 20.5 mm x 12.7 mm x 7.85 mm, allows for integration in the tightest of spaces. There are a number of options to choose from, including both cabled and top exit versions.

Easy fault finding and servicing

The Advanced Diagnostic Tool acquires comprehensive real-time data from ATOM DX encoder readheads. The information is displayed via the user-friendly ADT View software interface. Whilst in most cases the integral set-up LED on the encoder is sufficient for setting up the system, the ADT can be used to aid more challenging installations. The ADT can also report on encoder performance and assist system fault finding to avoid lengthy machine downtime.

Self-centring robust scale disc

Self-centring CENTRUM scale discs feature excellent part-to-part reproducibility and are easy to install 'right first time', every time.

The built-in alignment flexures are used to locate the scale disc both during scale manufacture and subsequent disc mounting, ensuring that the scale marks are concentrically located about the mounting shaft.

Optional Advanced Diagnostic Tool ADTi-100

Advanced Diagnostic Tool ADTi-100

The ATOM DX encoder system is compatible with the Advanced Diagnostic Tool ADTi-100 and ADT View software. They provide comprehensive real-time encoder data feedback to aid more challenging installations and diagnostics. The intuitive software interface can be used for:

  • Remote calibration
  • Signal optimisation over the entire axis length
  • Reference mark indication
  • Digital readout of encoder position (relative to the scale)
  • Monitoring the velocity against time graph
  • Exporting and saving data

Technical specifications

Measuring standard

Stainless steel disc

Readhead size (LxWxH)

Cabled variant: 20.5 mm x 12.7 mm x 10.85 mm

Top exit variant: 20.5 mm x 12.7 mm x 7.85 mm

Scale pitch

40 µm

Thermal expansion coefficient

15.5 ±0.5 µm/m/°C

Disc outer diameter

Fixing options:

Bolts: 38.4 mm to 120 mm

Clamp: 31 mm to 120 mm

For other sizes, contact Renishaw

Line count

Fixing options:

Bolts : 2 482 to 9 142

Clamp: 1 900 to 9 142

Reference mark

Single reference mark

Graduation accuracy

±0.5 µm

Installed accuracy< ±10 µm (when following recommended mounting)
Installed eccentricityTypically < ±5 µm
Shaft diameter

Fixing options:

Bolts: 7 mm to 88.6 mm

Clamp: 7 mm to 95 mm

Maximum speed

Up to 20 m/s

(See data sheet for details)

Sub-Divisional Error (SDE)

< ±120 nm

Dynamic signal control

Real time signal conditioning including Auto Gain Control (AGC) and Auto Offset Control (AOC) for optimised performance across a range of operating conditions

Incremental signals

10 µm to 5 nm resolution

(See data sheet for details)

Electrical connection

Cabled variant: 0.2 m, 0.5 m, 1 m, 1.5 m, 2 m and 3 m cable lengths with D-type connectors (9 and 15 way)
0.5 m, 1 m, 3 m cable lengths with 10-way JST connector
Top exit variant: readhead with 10-way JST connector

Power supply

5 V -5/+10% typically < 200 mA fully terminated

Vibration (operating)

100 m/s² max @ 55 Hz to 2000 Hz, 3 axes

Shock (operating)

500 m/s², 11 ms, ½ sine, 3 axes

Operating temperature

0 °C to +70 °C



Refer to data sheets for full details.