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2. Introduction
Congratulations on purchasing the XRT-A rotation stage. The XRT-A is designed for the rotation of small
loads (max. 100 gram) with a high accuracy and repeatability. The XRT-A is comprised of piezoelectric
actuators and an accurate optical encoder. This allows a closed loop control of small samples with high
accuracy and a long term stability.
The XRT-A, shown in Fig. 1, is a high-precision piezo-driven rotation table which can be used in a wide
range of applications. It provides unlimited bidirectional rotation. The integrated bearing function and
active error motion compensation guarantees submicron radial error motion in the longitudinal
direction of the stage. The integrated optical encoder provides 6.25 millidegrees angular resolution
(57600 positions/turn).
The XRT-A-NM is made from non-magnetic materials such as aluminium alloys, copper alloys, stainless
steel 316L and ceramics. As a result, it is not influenced by strong static or low-frequency magnetic
fields and also does not produce magnetic fields in itself.
The XRT-A can operate in 2 different modes: stick slip and direct mode. The XRT-A
’s primary operating
principle is stick-slip (i.e. for rotating the rotor). The direct mode, on the other hand, can be used to
reduce the radial error motion of the stage in the direction of compensation (i.e. the longitudinal
direction of the stage).
Remark: do not load the rotor with a mass or force higher than 1 N. This will damage the stage and
lead to a bigger error motion. The rotor can carefully be rotated manually without harming the
device.
Figure 1: XRT-A.
