  A procedure has been developed for the charge, mass and energy calibration of
ions produced in nuclear heavy ion reactions. The charge and mass
identification are based on a $\Delta$E-E technique. A computer code determines
the conversion from ADC channels into energy values, atomic number and mass of
the detected fragments by comparing with energy loss calculations through a
minimization routine. The procedure does not need prior measurements with beams
of known energy and charge. An application of this technique to the calibration
of the MULTICS apparatus is described.
