Mechanically compatible with its predecessor, the encoder comes in outer diameters ranging from 104 to 560 mm (4 to 22 inches)so cabling and other items can pass through the center of the ring. Each ring has the three-point centering method, which allows the installer to locate the center of the drum to the center of the machine bearing within just a couple of minutes. Each ring size has a unique line count on the outer diameter and an associated accuracy. For the largest ring diameter, an accuracy of ±1.5 arc seconds is specified for the graduation, and each ring is capable of resolutions to sub 0.01 arc seconds, all with high RPM potential. The two-track graduation design is also highly resistant to contamination like dust, fingerprints and scratches. In addition to the ENDAT 2.2 high speed pure serial interface, the scanning units on the encoders also come in Fanuc 05 and Mitsubishi 03-4 serial interfaces.
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