Sistema de encóder de alta precisión SiGNUM™ RELM

The RELM high accuracy scale offers high speed, non-contact performance, combined with advanced features including dynamic signal processing and the IN-TRAC™ auto-phase optical reference mark. RELM is extremely robust yet offers a level of performance previously available only from more delicate fine pitch encoder systems. With ±1 µm accuracy, low coefficient of thermal expansion and resolution to 5 nm, RELM satisfies the most demanding precision motion requirements.

The system comprises:

• RELM 20 µm pitch Invar spar
• SiGNUM™ SR readhead
• SiGNUM™ Si interface

RELM 20 µm pitch Invar scale

20 µm pitch RELM scale is manufactured from Invar, a low expansion nickel/iron alloy. The robustness of Invar permits a much smaller cross section than glass scale, yet allows easier handling and installation, without risk of breakage.

• Available in defined lengths up to 1130 mm with custom lengths available on request
• Accuracy is individually certified to ±1 µm, calibrated against International Standards
• Low coefficient of thermal expansion: Invar, ~0.6 µm/m/°C (0°C to 30°C)
• IN-TRAC™ auto-phase optical reference mark, bi-directionally repeatable even at maximum system speed (12.5 m/s)
• Mid-point (RELM) and end (RELE) reference mark positions available as standard
• Dual optical limits provide on-scale end of travel indication
• Easy to install, direct to the substrate, using datum clamp and clips or adhesive backing tape

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.