Abstract
A high-temperature Tian-Calvet type calorimeter has been constructed and the baseline fluctuation due to the change in the temperature at the main heater has been analysed. After applying a temperature oscillation at the main heater, temperatures at various positions in the calorimeter were measured as a function of time and were compared with those calculated according to a model. Temperature oscillations at the main heater were found to cause fluctuations of the baseline through deviations from the symmetry between the two calorimetric units, which was also simulated by the model calculation. It is suggested from these results that the presence of an air-containing region in the calorimeter is not desirable, the size of thermal insulators within the main heater should be as large as practical, and the thermal diffusivity of the thermal insulators should be as small as possible so as to decrease the fluctuations of the baseline due to the outer temperature fluctuations; it is also suggested that the baseline could be stabilized by correcting for deviations from symmetry.
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