Design and development of a programmable laboratory interface system with an illustrative use in resisitivity-temperature experiment.
Owade, Michael Odongo
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The need for microprocessor systems in conduction laboratory experiments is elaborately elaborately exemplified and the transducers needed to achieve resistivity and temperature measurements are described. The 8085 Microprocessor has been used as the CPU of the system. The theory which dictates how this CPU and its support ICs work (support ICs include memory and I /O ICs) are dealt with. Resistivity theory in semiconductors is also outlined. Design steps involved when designing the interface system is presented among with the necessary microprocessor development system (MDS) based on the IBM-Compatible RM Nimbus VX PC (80386) used as a server or user PC stations, which have RM Nimbus (80186) PC. Hardware design of the system is presented with special emphasis put on the designing of support chips in a way as to meet the 8085 microprocessor timing and electrical compatibility. The transducers for temperature and resistivity measurements are presented The software component for the system is designed to meet the requirement s of computation of resistivity values after a user defined temperature interval until a used defined final temperature is reached. The procedure of using the software/hardware mix (the microprocessor-based system) in performing the resistivity versus temperature experiment in outlined. Results of resistivity versus temperature measurement s and those of control thermometer's versus system’s temperature reading are presented and their analysis undertaken.