RGH25 encoder system

The open, non-contact and ultra-compact RGH25 readhead uses Renishaw's unique flexible 20 µm RGS20-S tape scale and offers resolutions to 10 nm. The low profile RGH25 features external interpolation through a range of interfaces, which offer automatic gain control, offset control, and diagnostic capabilities…

• RGB interface offers resolutions from 5 µm to 50 nm
• RGF interface offers resolutions from 0.2 µm to 10 nm

RGH25 system features and benefits

• The ultra-compact, low mass readhead is ideal for space critical applications
• Non-contact design offers high speed, reliable operation with zero friction and zero wear
• Integral set-up LED on the interface enables easy readhead installation
• Filtering optics guarantee excellent signal stability in conditions unsuitable for most open, optical encoders
• Self-tuning adaptive electronics ensure high accuracy and long-term reliability
• Automatic gain control (AGC) and automatic offset control (AOC) minimize cyclic error (<±0.1 µm)
• The reference mark provides a repeatable home position whilst the limit offers end of axis travel indication
• UHV compatible versions also available

Compare the RGH25 with alternative optical linear readheads.

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RGS20-S 20 µm pitch tape scale

20 µm RGS20-S is manufactured from a thin flexible steel strip, which is gold plated to give high reflectivity and corrosion resistance. It may be mounted, using adhesive backing tape, to most engineering materials, including metals, ceramics, and composites.

• Scale is supplied on a reel and can be cut to suit any axis length up to 70 m
• RGS-S scale matches the thermal behaviour of the substrate it is affixed to, simplifying thermal compensation
• Patented applicator tool enables fast and accurate scale installation
• Lacquer coated scale is easy to clean and resistant to handling
• 'Cut-to-measure' convenience ensures minimum waste and efficient inventory management
• ±3 µm/m linearity enables high accuracy with simple compensation

Technical specifications

Additional resources

Accessories and external interpolation options

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