RENISHAW: RGH25 RGS20 LINEAR ENCODER SYSTEM READHEAD RGH25F30J00A
RGH 25F READHEADS
RENISHAW - RGH25F - INCREMENTAL ENCODER SYSTEM WITH RGS LINEAR SCALE

RGH25F linear encoder system

The open, non-contact and compact RGH25F readhead uses Renishaw's unique flexible 20 µm RGS20-S tape scale and offers resolutions to 5 nm. The low profile RGH25F features external interpolation through the REF interface, which offers automatic gain control, offset control, and diagnostic capabilities.

The RoHS compliant REF interface replaces the RGB series, bringing high-end SiGNUM™ performance and resolutions to 5 nm. Please note that the RGH25 readhead and RGB interface are now obsolete and have been replaced by the RGH25F and REF.

RGH25F system features and benefits

The 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), automatic offset control (AOC) and automatic balance control (ABC) minimize cyclic error (<±50 nm)

The reference mark provides a repeatable home position whilst the limit offers end of axis travel indication

UHV compatible versions also available

DESCRIPTION

What is RGH25F? The RGH25F compact readhead offers reliable, high speed, open, non-contact performance with excellent immunity to dust, scratches and light oils on the scale. The RGH25F readhead is used with the REF interface which incorporates automatic gain control and unique self-tuning adaptive electronics. Combined with filtering optics, these ensure excellent signal integrity and low Sub-Divisional Error (SDE). The REF interfaces are available with high resolution digital outputs or with industry standard 1 Vpp analogue output. What is RGS20 scale? RGS20 is a tape scale manufactured from a thin flexible steel strip, featuring a 20 µm pitch, 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. Secured to the substrate with scale end-clamps, RGS20 is mastered to the substrate and will match the substrate's thermal expansion. The scale is supplied on a reel and can be cut to suit any axis length up to 50 m.