An Automatic Data Acquisition System for Calorimetry: The Specific Heat of &agr;‐Al2O3between 300 and 470 K
作者:
Douglas L. Martin,
Robert L. Snowdon,
期刊:
Review of Scientific Instruments
(AIP Available online 1970)
卷期:
Volume 41,
issue 12
页码: 1869-1876
ISSN:0034-6748
年代: 1970
DOI:10.1063/1.1684432
出版商: AIP
数据来源: AIP
摘要:
The data acquisition system, using a commercially available automatic ac bridge, digital voltmeter, and transistorized digital logic modules, is suitable for both discrete and continuous heating calorimetry. The output, via a Teletype, is a printed record and punched paper tape. The total cost of parts was less than $25 000. The computer program to handle the output is described. As an illustration of the operation of the system the results of measurements in the range 300–470 K on the calorimetric standard sample &agr;‐Al2O3are given. The measurements, having a precision of ±0.1%, were made in an improved form of the calorimeter described by Martin and Snowdon [Can. J. Phys.44, 1449 (1966)]. Agreement with the latest National Bureau of Standards results (Ditmars and Douglas) is around 0.1% when they are corrected to the same temperature scale. The effect of heater lead resistance on the results has been experimentally determined.
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