RGH40 linear encoder system

The open, non-contact RGH40 readhead is designed for use with Renishaw's 40 µm RGS40-G glass scale or 40 µm RESR ring and offers resolutions to 50 nm.

RGH40 readhead features and benefits

• Compact and robust readhead with internal interpolation offers industry standard digital and analogue outputs
• High speed, reliable operation with zero friction and zero wear
• 40 µm scale pitch offers generous readhead set-up tolerances
• Integral set-up LED simplifies set-up
• Patented filtering optics guarantee excellent signal stability in conditions unsuitable for most open, optical encoders
• The reference mark provides a repeatable home position whilst limits offer end of axis travel indication.  
• The RGH40 reads 40 µm RGS40-G glass scale, 40 µm RESR rings as well as industry standard 40 µm glass scale

Compare the RGH40 with alternative optical linear readheads

RGS40-G 40 µm pitch glass scale

RGS40-G 40 µm glass scale is read by RGH34 and RGH40 readheads. RGS40-G is ideal for applications where the scale needs to move independently of the substrate. The thermal behaviour of RGS40-G can be compensated for by the host controller using temperature sensors.

• Available in a range of measuring lengths from 120 mm to 1 m
• Defined thermal behaviour; C.T.E ~8.5 µm/m/°C
• Accuracy of <±5 µm/m
• Easy to install, directly to the substrate, using datum clamp and mechanical clips or adhesive backing tape

RESR 40 µm pitch ring

•  See RESR optical angle encoder systems

Technical specifications

Additional resources

Accessories and external interpolation options

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