The calibrator is an object that is able to transform a RawDataObject (RDO, which contains raw data, i.e. HGPre, HGPost LGPre, LGPost, TAC) into a MixedDataObject (MDO, where pedestals might be subtracted, a selection between gains made, etc... up to the point where you have only 1 ADC and 1 TDC value per channel) and/or into a CalibratedDataObject (CDO, which is the same as MDO but in GeV and ns, i.e. it access the time-zero calibrations).