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SiGNUM™ encoder series

What is SiGNUM?

SiGNUM is Renishaw's high accuracy, non-contact 20 µm incremental encoder system comprising of an Sr readhead and Si interface. It is sealed to IP64 and offers speeds up to 12.5 m/s and resolutions down to 5 nm, and reads a variety of linear and rotary scales with IN-TRAC auto-phase optical reference marks. SiGNUM is extremely easy to use with calibration at the push of a button and free diagnostic software, yet it offers a level of performance previously available only from more delicate fine pitch encoders with an SDE of typically <±30 nm at temperatures up to +85 °C.

Website cameo: Signum readhead

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.

ZeroMet™ spar 

RELM linear scale with IN-TRAC reference mark

Scale name

Accuracy

Scale pitch

Thermal expansion

coefficient

Max length of scale

Encoder systems

RELM/RELE

±1 µm for up to 1 m, then ±1 µm/m

20 µm

~0.6 µm/m/°C (0 °C to 30 °C)
<1.4 μm/m/°C (30 °C to 100 °C)

1.13 m

SiGNUM with RELM

Stainless steel spar

RELM Invar scale

Scale name

Accuracy

Scale pitch

Thermal expansion

coefficient

Max length of scale

Encoder systems

RSLM/RSLE/RSLC

±1.5 µm up to 1 m, ±2.25 µm up to 2 m, ±3 µm up to 3 m, ±4 µm up to 5 m

20 µm

~10.8 µm/m/°C

5 m

SiGNUM with RSLM

Stainless steel ring

RESR 3 rings

Scale name

Graduation accuracy (depending on ring diameter)

Scale pitch

Thermal expansion

coefficient

Ring diameter

Encoder systems

RESM/REST/RESD

 ±3.97 to ±0.38 arc seconds

20 µm

17 µm/m/°C

52 to 550 mm

SiGNUM with RESM 

 

Ultra-high accuracy stainless steel ring 

REXM rings

Scale name

Installed accuracy (depending on ring diameter)

Scale pitch

Thermal expansion

coefficient

Ring diameter

Encoder systems

REXM/REXT

(≥100 mm diameter) ±1 arc second
(75 mm diameter) ±1.5 arc seconds
(≤57 mm diameter) ±2 arc seconds

20 µm

17 µm/m/°C

 

52 to 417 mm

SiGNUM with REXM