Low‐Temperature Adiabatic Calorimeter with Automatic Shield Control
作者:
W. J. Cooper,
R. H. Forsyth,
J. F. Masi,
R. E. Pabst,
期刊:
Review of Scientific Instruments
(AIP Available online 1959)
卷期:
Volume 30,
issue 7
页码: 557-559
ISSN:0034-6748
年代: 1959
DOI:10.1063/1.1716680
出版商: AIP
数据来源: AIP
摘要:
The design and operation of an adiabatic low‐temperature calorimeter employing a somewhat different design of automatic shield control is described. Thermocouple difference is sensed by a dc &mgr;v amplifier, which is followed in the circuit by a recorder‐controller and a Leeds & Northrup Series 60 (current adjusting type) control unit. The output of the latter is used to control the voltage across the shield heaters through a Westinghouse ``Magamp'' saturable reactor. This design has been used successfully with a conventional low‐temperature adiabatic calorimeter (50‐ml sample size). In most cases the recorder showed no variation from zero (±0.002°) during heating and equilibrating periods, while momentary disturbance at ``on'' and ``off'' was less than 0.05°.
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