Hitachi High-Tech Science has launched the new temperature modulated DSC software. The linear cooling or heating rate is overlaid with a sinusoidal temperature profile. Amplitude and frequency can be chosen by the operator. After the measurement the data are converted in three different DSC signals. The conventional DSC signal, the reversible and the no reversible component. By using this technique, quite often overlapping effects can be separated. Especially analysing glass transitions the advantages are evident. While the reversible component shows the glass transition without thermal history, while the non reversible component just shows the enthalpy relaxation.