RG2/RG4 encoder series

Not recommended for new designs

What are RG2 and RG4 ?

RG2 and RG4 are the names given to the range of incremental encoder products that read 20 µm and 40 µm pitch scale types, as detailed in the links below:

Gold plated tape

Scale name

Accuracy

Scale pitch

Coefficient of thermal expansion

Supplied length

Readhead compatibility

RGS

±15 µm/m

20 µm/40 µm

Thermally mastered to substrate by use of end clamps

Up to 50 m (>50 m contact Renishaw)

RGH22, RGH24, RGH25F, RGH25F UHV, RGH34, RGH41

Glass spar

Scale name

Accuracy

Scale pitch

Coefficient of thermal expansion

Supplied length

Readhead compatibility

RGS40-G

±4.2 µm/m

40 µm

~8 µm/m/°C

Up to 1.01 m

RGH40

Stainless steel tape with track option

Scale name

Accuracy

Scale pitch

Coefficient of thermal expansion at 20 °C

Supplied length

Readhead compatibility

RTLR40 with optional FASTRACK™

±15 µm/m

40 µm

10.1 ±0.2 µm/m/°C

Up to 10 m

RGH45

Stainless steel spar

Scale name	Accuracy	Scale pitch	Coefficient of thermal expansion at 20 °C	Supplied length	Readhead compatibility
RSLR20	±1.5 µm up to 1 m, ±2.25 µm up to 2 m, ±3 µm up to 3 m, ±4 µm up to 5 m	20 µm	10.1 ±0.2 µm/m/°C	Up to 5 m	RGH20, RGH20F