 | | RESR圆光栅系统
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 Renishaw's RESR angle encoder offers impressive performance. With graduation accuracy to ±0.5 arc second and resolution to 0.004 arc second, the RESR suits the most demanding precision applications.
RESR rings
 The RESR ring is a one-piece stainless steel ring with graduations marked axially on the periphery. The 20 µm pitch RESR is compatible with the RGH20 and RGH35 readheads, while the 40 µm pitch RESR is compatible with the RGH34 and RGH40 readheads.
- Graduation accuracy to ±0.5 arc second and system repeatability to 0.004 arc second
- A wide range of diameters and line counts provide compatibility with industry standard controllers (Ø52 mm to Ø550 mm with line counts from 4,096 to 86,400)
- Patented taper mount minimizes installation errors and simplifies integration
- 10 mm x 10 mm small cross section ring
- Low mass, low inertia design enhances dynamic performance
- One piece stainless steel ring withstands vibration, mechanical and thermal shock, and thermal overload
- For even higher acceleration and deceleration, and faster settling times, extra-low inertia 'B' section rings are also available
- The reference mark, which offers a repeatable home position, is provided by a separate magnetic actuator
- 20 µm pitch rings are compatible with the UHV compatible RGH20F readhead
Upgrade to TONiC™ - see more details RGH20 readhead features and benefits
 Compact readhead offers industry standard digital and analogue outputs- Non-contact design offers high speed, reliable operation with zero friction and zero wear
- Readhead set-up LED simplifies installation
- Patented filtering optics guarantee excellent signal stability in conditions unsuitable for most open, optical encoders
- The REF interface offers automatic gain control (AGC), automatic balance control (ABC) and automatic offset control (AOC) to minimize cyclic error (<±50 nm)
- The reference mark provides a repeatable home position whilst the limit offers end of axis travel indication
- Ultra-high vacuum compatible RGH20F versions available
Compare the RGH20 with alternative optical angle readheads. RGH34 readhead features and benefits RGH40 readhead features and benefits Technical specifications
| Readhead dimensions |
14.8 mm x 36.0 mm x 13.5 mm (RGH20) (H x L x W)
10.5 mm x 36.0 mm x 13.5 mm (RGH20F)
9.5 mm x 15.0 mm x 15.0 mm (RGH35) |
| Outputs (resolution) |
RS422: 5 µm, 1 µm, 0.5 µm, 0.2 µm, 0.1 µm, 50 nm, 20 nm (RGH20F only), 10 nm (RGH20F only), 5 nm (RGH20F only).
Analogue: 1Vpp |
| Interpolation |
RGH20 - internal interpolation to 50 nm
RGH20F - REF interface (x4 to x4000) (Binary interpolation factors from x4 to x4096 available)
RGH35 - RGI34 interface (x4 to x400) |
| Reference mark |
Bolt on magnetic actuator |
| Limit switches |
Single limit (dual limits available with RGH40 and 40 µm pitch RESR) |
| Maximum speed |
2,938 rev/min (20 µm at Ø52 mm) |
| Ride height tolerance |
0.8 ±0.08 mm |
| Scale types |
20 µm pitch (compatible with RGH20 and RGH35) and 40 µm pitch (compatible with RGH34 and RGH40) RESR rings |
| Vacuum compatible |
Yes – RGH20F and 20 µm pitch RESR | System accuracy - 20 µm pitch RESR and RGH20 | Nominal outside diameter (mm) | System accuracy (arc second) | | 52 | 5.6 | | 57 | 5.1 | | 75 | 3.9 | | 100 | 2.9 | | 101 | 2.9 | | 103 | 2.8 | | 104 | 2.8 | | 115 | 2.5 | | 150 | 1.9 | | 200 | 1.4 | | | Nominal outside diameter (mm) | System accuracy (arc second) | | 206 | 1.4 | | 209 | 1.4 | | 229 | 1.3 | | 255 | 1.1 | | 300 | 1.0 | | 350 | 0.8 | | 413 | 0.7 | | 417 | 0.7 | | 489 | 0.6 | | 550 | 0.5 | | Note: system error is graduation error plus sub-divisional error (SDE). Effects such as eccentricity influence installed performance; for application advice please contact Renishaw.
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