The LArg calorimeter calibration board

In order to fulfil its physics requirements, the ATLASLiquid Argon calorimeter needs a very accurate calibration system. Some calibration boards for module 0 calorimeter have been designed and built.These boards have been characterised and the measurements have demonstrated a good linearity over the 16 bits dynamic range and a small non-uniformity ( < 0.2 %). Small systematic effects have also been observed. Finally some tests of the behaviour of theboard against radiation and magnetic field have been performed.