Optical incremental encoder
Renishaw ATOM optical incremental encoder
Miniature incremental optical encoder with filtering optics, aimed at space-constrained axes. Available with cable or flexible printed circuit readheads and a range of interpolation interfaces.
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Need Renishaw parts, a replacement or another suitable option? Send your part number or describe what the machine needs to do. We connect your requirement with experienced UK engineering and procurement support to help you get the right products, pricing and supply options. Your matched provider can take the enquiry through quotation and ordering to delivery and after-sales support.
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What are you specifying?
Select everything you need. A motor, drive and gearbox can be specified together as one axis.
Key specifications
| Outer diameter | 17–108 mm |
|---|---|
| Ingress protection | IP40 |
| Linear speed (max) | 20 m/s |
| Resolution (finest) | 1 nm |
| Accuracy | RTLF20/RKLF20 ±5 µm/m; RTLF40/RKLF40 ±15 µm/m; RCLC glass ±3 µm; disc ±19.7 to ±3.1 arc sec system |
| Interface | RS422 digital, 1 Vpp analogue |
Summarised in our own words from Renishaw plc's published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1 · Source 2 · Source 3
Notes on this data
Readhead 20.5 x 12.7 x 8.35 mm (FPC 7.3 mm high). IP40 cable readhead, IP20 FPC readhead. Operating 0 to +70 °C. 40 µm readhead 20 m/s, 20 µm readhead 10 m/s. Rotary up to 29,300 rpm. od_mm = RCDM disc OD.
Specify Motion is not affiliated with Renishaw plc. Renishaw and ATOM are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Engineer support
Speak to our engineers about your project
Our experienced engineers are on hand, ready to help with your project. Whether you need the Renishaw ATOM itself, help sourcing it, or a modified or custom design built around your load, speed and space, tell us what the machine has to do and we'll come back with the right option.
- Help sourcing ATOM and spares for installed machines
- Modified and custom designs when a catalogue part doesn't fit
- Complete axis: motor, drive, gearing and feedback matched together
Renishaw ATOM model codes
Published model codes in the ATOM range. Search this page for your part number, or send it to us for availability or an equivalent.
| Model code | Description | Pricing / replacement |
|---|---|---|
| RTLF | Linear stainless steel tape scale | Quote or replacement for RTLF → |
| RCLC | Linear glass spar scale | Quote or replacement for RCLC → |
| RKLF-S | Narrow stainless steel tape scale (linear or partial arc) | Quote or replacement for RKLF-S → |
| RCDM | Rotary glass disc scale | Quote or replacement for RCDM → |
Typical applications
What an optical incremental encoder is
An optical incremental encoder measures motion by shining light through or reflecting it from a disc or scale with fine graduations onto photodetectors. As the disc or scale moves, the encoder outputs two square-wave or sine-wave channels in quadrature, called A and B, plus an index pulse once per revolution or at reference marks. The counter in the drive or controller tracks position by counting edges from a home point. Optical encoders achieve very high resolution and accuracy.
When engineers choose an optical incremental encoder
Choose an optical incremental encoder for precise speed and position feedback where homing at power-up is acceptable, such as servo motors, stages and machine tools. They are widely compatible and cost effective. The trade-offs are contamination and power loss: dust, oil and condensation can obscure the optical path, and position is lost when power is removed. For harsh environments, magnetic or inductive encoders may suit better.
How to specify the Renishaw ATOM
Send these with your enquiry and an engineer can confirm the right ATOM variant or an equivalent:
- Resolution (lines per revolution or µm)
- Output type: TTL, HTL or sin/cos
- Index or reference marks
- Shaft or hollow shaft size (mm)
- Maximum speed (rpm or m/s)
- Supply voltage (V)
- Environment and IP code
Common mistakes to avoid
- Choosing resolution above what the drive input can count
- Running long cables with TTL signals without line drivers
- Ignoring contamination in open optical designs
- Forgetting homing routines after power-up
Renishaw ATOM: frequently asked questions
Can you help replace Renishaw ATOM or source the original?
Send the full model code, quantity and required date. Our engineers can check original-part availability and assess suitable alternatives, including supply-network options where appropriate. We confirm compatibility and any changes needed before recommending a replacement.
What is the Renishaw ATOM?
Miniature incremental optical encoder with filtering optics, aimed at space-constrained axes. Available with cable or flexible printed circuit readheads and a range of interpolation interfaces. Published series figures include outer diameter 17 mm, outer diameter 108 mm, linear speed 20 m/s, resolution (finest) 1 nm. It is made by Renishaw plc; Specify Motion can help source it or propose an equivalent.
What model codes are in the Renishaw ATOM range?
The ATOM range includes RTLF, RCLC, RKLF-S, RCDM. The table on this page lists each published model code with its key figures. Send us the code you use, or the one you need to replace, and our engineers will confirm availability, lead time or the closest equivalent.
Who makes the Renishaw ATOM?
The Renishaw ATOM is made by Renishaw (Renishaw plc) and is listed here for engineers comparing options. Specify Motion is not affiliated with Renishaw plc; brand names are used only to identify the product.
What is the outer diameter of the Renishaw ATOM?
The published series minimum outer diameter is 17 mm. Individual models and sizes in the ATOM range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the Renishaw ATOM?
We can assess suitable replacement options. Our engineers can review the original model and propose options for your load, speed and environment. An engineer confirms the fit against your application before recommending anything.
What is quadrature output on an incremental encoder?
Quadrature output provides two channels, A and B, offset by 90 electrical degrees. Comparing which leads gives direction, and counting edges on both gives four times the line count in resolution. An index pulse marks a reference position for homing.
What is the difference between TTL and HTL outputs?
TTL outputs use a 5 V differential signal, which suits high frequencies and is commonly used with line drivers. HTL outputs use a higher voltage swing, typically matched to a 10 to 30 V supply, which improves noise immunity on long cables. Match the output type to the drive or controller input.
Further reading: Absolute vs incremental encoders · How to select an encoder · Encoders and feedback
Other optical incremental encoder series
Engineer support
Our engineers are ready to help with your project
Tell us about your project and how you use the Renishaw ATOM: the load, speed, duty and environment. An experienced engineer will review it and reply, normally within one working day.
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