Linear scale enhances encoder accuracy

Introduced at Semicon West 2005, the RELM high-accuracy linear scale is an exciting addition to Renishaw's Signum range of intelligent encoders.

Introduced at Semicon West 2005, the RELM high-accuracy linear scale is an exciting addition to Renishaw's Signum range of intelligent encoders.

Initially available in Invar, which provides a low thermal expansion of 1.3um/m/K, the RELM scale is offered with a choice of In-Trac reference mark positions and dual optical limits.

Offering high speed, reliable, noncontact performance combined with advanced features including the In-Trac auto-phase optical reference mark, the Signum range redefines encoder performance.

The system comprises the SR readhead, Si interface and 20um RELM spar, which is offered in defined lengths.

The In-Trac optical reference mark is repeatable in both directions across the entire speed and temperature range (over 10m/s and up to 85C).

The robust, yet highly precise, 20um spars offer a level of performance previously available only from more delicate fine pitch encoder systems.

With accuracy to +/-1um/m and resolution to 20nm, RELM satisfies the most demanding precision motion requirements.

The SR readhead is sealed to IP64 and offers high speed, high temperature performance (over 10m/s and up to 85C).

Like all Renishaw encoders, it benefits from unique filtering optics, which provide excellent immunity to dirt, dust and scratches.

RELM scale is easy to install and can be mounted directly to the substrate using mechanical clips or a specially formulated adhesive backing tape.

The Si interface can be mounted remotely and a small connector on the readhead can easily be fed through machines where access is restricted.

As part of the Signum range, the RELM encoder system benefits from Signum intelligent signal processing, which ensures excellent reliability and ultra-low cyclic error (typically below +/-40nm).

In addition, comprehensive Signum software enables optimum setup and real-time system diagnostics via a PC's USB port.

As with all Renishaw products, the Signum range is backed-up by a worldwide team offering truly responsive global support.

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