By Dr. G. W. H. Höhne, Dr. W. F. Hemminger, Dr. H.-J. Flammersheim

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Heating-Iso mode This is the limiting case between the two modes above where TAW = Po: the heating rate varies periodically between TAW + Po and zero. 1O. Special temperature-modulated modes of operation: (a) step-scan, (b) sawtooth 29 5 t

1 Heat Flux DSC 43 are determined with heat flux DSCs, the sample and the reference sample should be as similar as possible (CR ::::: CS,RMR ::::: R MS )' The factor (l/R + 2IR MM ) is decisive for the sensitivity of the calorimeter; the greater the thermal resistance of the disk, the higher the peak for a given heat of transition. However, as a result the time constant T increases as well, i. , the system becomes more inert. In addition, this factor allows the conclusion to be drawn that the ratio of R to RMM plays an important role for the sensitivity.

3 DSC with Combined Heat Flux and Power Compensation Measuring System The "pure" power compensation DSC measuring system uses two thermally decoupled microfurnaces with an integrated temperature sensor and heater in each furnace (cf. Sect. 2). So called "hybrid systems" show a pair of sensorheater combinations on a disk. The temperature difference between the positions of the sample and the reference sample is measured by the temperature sensors and (almost) compensated for by means of controlling the integrated heaters.

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