Specific Heat Determinations by Pulse Calorimetry Utilizing a Digital Voltmeter for Data Acquisition

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Abstract
A pulse calorimeter for measuring the specific heat of electrical conductors from 25 to 900°C is described. The technique employed was unique in that a digital voltmeter, which was capable of recording 400 readings per second to a readability of 0.1% of full scale, was utilized to measure the transient temperature and power signals requisite to the method. Using this technique, a calculated determinate accuracy of 99% was achieved. Measurements of the specific heat of high‐purity iron from 25 to 900°C confirmed this calculated accuracy and were repeatable to within ±0.5%. The calorimeter was capable of measuring the specific heat rapidly at temperature intervals as small as 0.1 C°. Modifications are suggested to decrease the measurement errors to 0.5% and to increase the temperature range from −190 to 1400°C.

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