 | | Ultra-high accuracy angle encoder systems Precision rotary axes often require very high accuracy without calibration or error-map. Renishaw's new ultra-high accuracy angle encoder solutions are perfect for such demanding applications.
DSi (Dual SiGNUM™ interface)
 DSi combines the incremental signals from two SR readheads on a RESM ring to offer total installed accuracy of typically ±2.0 arc second (Ø209 mm RESM ring).
- DSi compensates for the effect of bearing wander and odd error harmonics by blending the signals from two SR readheads
- Angularly repeatable propoZ™ reference position is unaffected by bearing wander or power cycling
- The propoZ™ reference position is customer selected by driving the axis to the desired position and simply pressing a button on the DSi
- DSi makes adding a second readhead easy - the combined outputs simply appear to the controller as a single very high accuracy encoder
- The DSi adds further performance to the dynamic advantages of the RESM ring and all of the benefits of the SR readhead and Si interface
The REXM ultra-high accuracy ring
 The DSi combined with the new ultra-high accuracy REXM ring offers new levels of angular metrology…
- When REXM is used with DSi it offers better than ±1 arc second total installed accuracy
- Non-contact system locks to the rotor to eliminate 'reversal errors' and coupling losses
- The REXM ring features a thick cross-section to minimise all installation errors except eccentricity
- Eccentricity is eliminated using the DSi which means that the only errors remaining are graduation and SDE, both of which are exceedingly small
- REXM and DSi add to dynamic performance advantages of SiGNUM™ RESM angle encoder systems
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