  Detailed studies of the resolution of a EUDET-type beam telescope are carried
out using the DATURA beam telescope as an example. The EUDET-type beam
telescopes make use of CMOS MIMOSA 26 pixel detectors for particle tracking
allowing for precise characterisation of particle sensing devices. A profound
understanding of the performance of the beam telescope as a whole is obtained
by a detailed characterisation of the sensors themselves. The differential
intrinsic resolution as measured in a MIMOSA 26 sensor is extracted using an
iterative pull method and various quantities that depend on the size of the
cluster are discussed: the residual distribution, the intra-pixel
residual-width distribution and the intra-pixel density distribution of track
incident positions.
