Grating period 4 µm System accuracy ± 1 µm Incremental signals 11 µASS Signal Period 2 µm Reference Mark Approx. 1.7 mm below upper stop Required Moving Force 0.1 N to 0.6 N (depending on operating attitude) Permissible radial force = 0,5 N Measuring Velocity = 24 m/min (depending on the subsequent electronics) = 12 m/min with the ND 281B display unit