MTDSC Calibration: dependence of the instrumental response upon experimental conditions.

The heat capacity calibration constants of a commercial MTDSC instrument were determined in a variety of experimental conditions. For a given modulation frequency, the calibration constants are the same within a few percents for different temperatures and over a wide range of scan rates and modulation amplitudes. On the other hand, the modulation constants change substantially with the period. Rules to optimize the accuracy of the system are given.