Graduate Thesis Or Dissertation
 

Automation of a low-temperature calorimeter

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/vt150m817

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  • An adiabatic calorimeter operating over the range 5 to 300 K has been automated. Instrumentation includes computer controlled data acquisition, a low-thermal emf multiplexer for switching low-level dc signals, and automatic analog shield controls. Temperature measurements are made with platinum and germanium resistance thermometers, and the thermometer resistances are determined with a programmable dc voltage source and a digital nanovoltmeter. Heat capacity measurements of benzoic acid agree to within ±0.1 per cent at 300 K with accepted values. Accuracy is equal to the manual method from 5 to 50 K, and greater than the manual method from 50 to 300 K.
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