SiGNUM™ RSLM linear encoder system

The new RSLM stainless steel spar scale offers performance to rival fine pitch glass scales yet offering a total accuracy (including slope and linearity) better than ±4 μm over a 5 m length – an industry first! With ±30 nm cyclic error, unique filtering optics, resolution to 5 nm and simple installation, SiGNUM™ RSLM retains all of the benefits of a 20 μm encoder yet provides the performance of a fine pitch system. For lengths up to 10 m, please contact your local Renishaw representative.

RSLM 20 µm pitch stainless steel scale

20 µm RSLM stainless steel scale is perfect for long travel applications where metrology can not be compromised.

• The robust spar scale is available in defined lengths up to 10 m, please contact your local Renishaw representative
• Total accuracy better than ±4 µm over a 5 m length
• Thermal expansion: 10.8 µm/m/°C
• RSLM can be coiled for simple storage and handling, yet once uncoiled behaves as a spar scale
• Mounted using specially formulated adhesive tape or mechanical clips
• IN-TRAC™ auto-phase optical reference mark, bi-directionally repeatable even at maximum speed (12.5 m/s)
• Multiple IN-TRAC™ reference mark positions: scale mid-point (RSLM), scale end-point (RSLE), distance coded for short travel indexing (RSLD) or regularly spaced for customer selection (RSLC)
• Dual optical limits provide on-scale end-of-travel indication

SR readhead and Si interface features and benefits

• Cyclic error of ±30 nm, offering 'fine pitch' encoder performance
• Capable of operation up to 12.5 m/s and 85 °C
• Excellent signal stability in conditions unsuitable for most open optical encoders
• Si interface offers industry standard analogue and digital outputs
• User selectable gain control (AGC) maintains 1 Vpp analogue signal amplitude
• Integral LEDs on readhead and interface for optimum set-up and system diagnosis
• High flex UL approved cable – up to 10 m between readhead and interface
• Optional IP68 in-line connector available

Compare the SR with alternative optical linear readheads.

SiGNUM™ software

SiGNUM™ software is PC based and provides comprehensive calibration, set-up optimisation and real-time diagnostics to simplify installation and system maintenance. The Si interface is connected to the PC via a mini USB connector.

• "Real time", remote monitoring of signal level and system performance, including signal strength meter, Lissajous plot and IRED feedback meter (AGC drive), to assist with system optimisation
• Pitch adjustment indicator enables fine adjustment of the readhead pitch
• Quick and simple remote calibration of the reference mark and incremental signals
• System alerts warn the user of conditions that are less than optimum (warning function) and of any errors that occur (alarm function)
• Technical "info" guide provides contextual help and a detailed explanation of system functions and fault-finding
• System configuration page displays Si interface configuration detailing resolution, clock frequency, etc.
• Multilingual user interface allows the user to select from English, German, Italian and Japanese

Download SiGNUM software now.

Technical specifications

Additional resources

Accessories and external interpolation options

For further information and product options, visit the encoder product configurator.