Abstract: A differential scanning microcalorimeter comprising sample and reference calorimetric chambers. The chambers are made as elongated tubes and each is fitted with heater and temperature-sensing elements connected to a power measuring system of controlled thermal processes. In addition, each chamber is provided with an additional temperature-sensing element to separate its sensitive volume which is connected to a sensitive volume separation system. The output of the sensitive volume separation system is connected to an additional heater element placed on tubes external of the chamber sensitive volumes.

Abstract: A differential microcalorimeter comprises a means for programmed heating of cells which accommodate heating and thermosensitive elements, a means for measuring power output of a thermal process under study, an a-c voltage source and a temperature measuring circuit, as well as a variable resistor for adjusting the baseline. The outputs of the means for measuring power output of a thermal process under study and of the means for programmed heating of the cells are connected, via appropriate phase-sensitive switches, to the second terminals of the series connected heating elements having their interconnected first terminals connected, via an appropriate phase-sensitive switch, to a movable terminal of the variable resistor for adjusting the baseline.