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QUANTiC™ incremental encoder system with RESM40 rotary (angle) ring


  • Operating rideheight tolerance ±0.2 mm
  • Digital or analogue output direct from the readhead
  • Readhead size: 35 x 13.5 x 10 mm
  • Resolutions to 50 nm
  • Speed up to 8 800 rpm
  • Excellent dirt immunity
  • Optical IN‑TRAC™ reference mark


  • Easy installation
  • No separate interface required
  • Compatible with the Advanced Diagnostic Tool ADTi-100 for easy fault finding, challenging installations and servicing
  • Low-profile ring with large internal diameter for easy integration
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What is QUANTiC?

The QUANTiC encoder series is Renishaw's incremental open optical encoder with digital or analogue output options, good metrology, high speed performance, and easy installation and set-up. Diagnostic information can be accessed by using the optional Advanced Diagnostic Tool ADTi‑100 and ADT View software during installation or for in‑field diagnostics and fault finding. Speeds up to 24 m/s can be achieved to meet the most demanding motion control requirements. The QUANTiC encoder offers resolutions down to 50 nm and a wide range of configurations, making optimisation easy and simple. Dynamic signal processing gives improved signal stability to achieve superior performance from your motion control system.

What is RESM40 ring?

RESM40 is a one-piece stainless steel ring with 40 µm pitch incremental graduations marked directly on the periphery, featuring the IN-TRAC optical reference mark. Two versions are available in a wide range of sizes (Ø52 mm to Ø550 mm): ‘A' section rings, which offer an impressive installed accuracy and feature a taper mount system, reducing the need for highly toleranced machined parts and eliminating eccentricity; and ‘B' section thin rings, which have low inertia and mass. Both 'A' and 'B' section rings have a large internal diameter for flexible integration. The non-contact format eliminates backlash, shaft wind-up (torsion) and other mechanical hysteresis errors that are inherent in traditional enclosed encoders.

Why choose this encoder system?

Easy installation

In OEM applications, machine build time is critical, as time saved in component installation allows shorter manufacturing lead times and ultimately higher profitability. The QUANTiC encoder series helps to fulfil this need with its wide set-up tolerances for an incremental product (yaw tolerance ±0.9° and rideheight tolerance ±0.15 mm) and integrated set-up LED on the readhead. With increased installation tolerances, production will benefit from a faster installation process, reduced overheads and an increase in throughput.

All purpose digital and analogue encoder system

The QUANTiC encoder is available with industry-standard 1 Vpp analogue output for easy integration into customers' interpolation electronics or with high speed digital interpolation built into the readhead. The digital output configurations available allow the user to optimise the speed and resolution of their system depending on their motion control requirements. Furthermore, the QUANTiC readhead works with both linear and rotary (angle) scales across a range of accuracies. It is quick and easy to install, making it particularly suitable for volume production.

Excellent dirt immunity

The QUANTiC encoder system is highly immune to dirt and contamination due to several advanced design features. QUANTiC readheads incorporate Renishaw's well established filtering optics that average the contributions from many scale periods and effectively filter out non-periodic features such as dirt. Measurement signals are further enhanced by a range of electronic signal processing algorithms such as Auto Gain Control (AGC), Auto Offset Control (AOC) and Auto Balance Control (ABC). QUANTiC encoders also feature a third layer of signal filtering from a new detector design, which helps to eliminate non-harmonic signal frequencies that can occur due to contamination on the scale. These signal conditioning features combine to ensure low Sub-Divisional Error (SDE) and minimal signal variation over contamination.

Optional Advanced Diagnostic Tool ADTi-100

Advanced Diagnostic Tool ADTi-100

The QUANTiC 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
  • Readhead pitch indication
  • Limit and reference mark indication
  • Readout of encoder position (relative to the scale)
  • Monitoring the velocity against time graph
  • Exporting and saving data

Technical specifications

Measuring standard

One-piece low profile stainless steel ring. Standard ‘A' section with tapered internal diameter or low inertia ‘B' section rings available

Readhead size (LxHxW)

35 mm x 13.5 mm x 10 mm

Scale pitch

40 μm

Coefficient of thermal expansion at 20 °C15.5 ±0.5 µm/m/°C

Ring outer diameter

52 mm to 550 mm. For larger custom sizes, contact Renishaw

Line count

4 096 to 43 200 (depending on ring size)

Reference mark

Single IN-TRAC reference mark


Graduation accuracy

System accuracy

±3.97 to ±0.38 arc seconds (depending on ring diameter)

±4.6 to ±0.44 arc seconds (depending on ring diameter)

Maximum speed



See data sheet for details

7 300 rpm (for 52 mm diameter ring)

8 800 rpm (for 52 mm diameter ring)

Sub-Divisional Error (SDE)



Typically <±120 nm for Ø <135 mm, typically <±150 nm for Ø >135 mm

Typically <±80 nm for Ø <135 mm, typically <±150 nm for Ø >135 mm

Dynamic signal control

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

Incremental signals



1 Vpp (40 µm)

RS422 (10 μm to 50 nm)

Electrical connection

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 pin) or circular in-line connector (12 pin)

0.5 m, 1 m, 3 m cable lengths with 14-way JST connector

Power supply



5 V -5%/+10%

Typically 150 mA fully terminated

Typically 200 mA fully terminated

Vibration (operating)

100 m/s2 max at 55 Hz to 2 000 Hz, 3 axes

Shock (operating)

500 m/s2, 11 ms, ½ sine, 3 axes

Operating temperature

0 °C to +70 °C



* System accuracy is graduation error plus SDE. Graduation accuracy is the maximum difference between the angle measured by a single readhead and the true rotation of the encoder as graduated. Application disturbances such as eccentricity are not included.

Refer to data sheets for full details.