Abstract
The data-acquisition and data-reduction procedures of an existing system designed for precise adiabatic calorimetry at cryogenic temperatures in strong magnetic fields were automated with a microprocessor (μp) based controller. A M6800 μp is used for handling the logic control functions, and the numerical calculations are handled by a MM57109 number processor (♯P, a calculator-type integrated circuit). This combination of μp and ♯P provides a very cost-effective design for an instrument controller with minimal hardware and software requirements. With on-line data processing capability, the heat capacity results are readily available to the operator during the experiment. A generalized algorithm was developed to handle multiple-order curve fitting without the need for double-precision arithmetic. The basic electronic system and the data-reduction procedures are described.
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