  We study the extent to which the outcomes of a quantum measurement can be
manipulated by changing the state of the measurement apparatus. The measurement
process is modeled as decoherence induced by the experimenter, to gain
knowledge about a particular system. The measurement apparatus is assumed to
contain a large number of degrees of freedom, and the measurement outcomes are
obtained by looking at the long interaction time limit. We study two cases
which show contrasting behaviour. With a fixed axis coupling, the measurement
is performed along the pointer basis with a high degree of robustness, for a
wide variety of bath states. In a second model with Heisenberg interactions,
the measurement outcomes can be altered considerably by changing the state of
the bath.
