Temperature stabilized effusion cell evaporation source for thin film deposition and molecular-beam epitaxy Rev.A very precisely regulated compact thermostat for small-angle neutron scattering Rev.This article presents a trial for deriving a thermal transfer model of a thermostat housing a heat source generating several watts and achieving high temperature stabilization. It is intended for investigating the open-loop linearity of operational amplifiers labeled as high precision or low noise and their noise characteristics. This thermostat is built up with a double-jacket constructed with a copper plate of 10 mm thickness and an approach of deriving a lumped parameter model to each jacket on the temperature control is presented. The temperature stability of the order of 3 ϫ 10 Ϫ5°C per 1°C temperature change in the air outside in 1 h is realized in the inner jacket. The linearity is measurable and it is clarified that amplifiers are classified into three groups.
Recently it seems that there are almost no multipliers using Hall elements. This fact mainly comes from the magnetic nonlinearity such as magnetic saturation and hysteresis of a magnetic core used in order to increase the gain of the magnetic flux path.This paper shows realization of a high precision multiplier using a Hall element with magnetic flux control. Moreover, the relation between the precision of the flux control and the precision of the multiplier is clarified. As a result, it is shown that the precision of the proposed multiplier is considerably higher than that of a existing IC multiplier.
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