Precision and widefield polarimetry with the Australia Telescope Compact Array

This paper describes some of the polarimetry done with the Australia Telescope Compact Array (ATCA). Comparatively low and stable instrumental polarization allows high quality polarimetric images to be formed. The instrument has proven particularly successful in studying low level circular polarization. The instrument has also proven itself excellent for widefield imaging of galactic polarization. We consider some of the techniques used in widefield polarimetry of an interferometer.