  We introduce a new experimental setup with a biasing circuit and computer
control for electrical power regulation under reversing polarity in Pt
microwires with dimensions of $1\times10$ {\mu}m$^2$. The circuit is computer
controlled via a data acquisition board. It amplifies a control signal from the
computer and drives current of alternating polarity through the sample in
question. Time-to-failure investigations under DC and AC current stress are
performed. We confirm that AC current stress can improve the life time of
microwires at least by a factor of $10^3$ compared to the corresponding
time-to-failure under DC current stress.
