Position measurement assembly for rotational and translational position measurement has evaluation units for determining a coarse reference position, beat signals from a measurement scale and a fine reference position from the two

摘要

Position measurement assembly comprises a measurement scale (10) and a sampling unit (20) that is moved relative to it. The scale has an incremental track with defined incremental divisions. The sampling unit has a first evaluation unit (40) connected to it for determination of a coarse reference position and a second evaluation unit (50) for measuring a beat signal phase. A third evaluation unit using the coarse reference position and beat signal period and phase to determine a fine reference position.