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数字系统中A/D和D/A转换器的基准电压随温度而变化会对系统的精度产生严重的影响,因此应把数字系统置于恒温环境之中。然而,如果将整个数字系统都置于恒温环境之中则耗费昂贵,也没有必要,有时在技术上也不易实现,所以有必要采用一个有着局部恒温环境的装置——恒温楷,把数字系统中的关键元件置于恒温槽内,从而提高了整个系统的温度稳定性。本文结合笔者在恒温槽及其控制系统的设计和研制中的体会,介绍了一种恒温技术,并阐述了这种技术应用的可行性。最后本文用实验数据证明了这种恒温槽技术有效地保证了关键元件处于接近于恒温的局部环境之中,从而改善了数字系统温度稳定性。本文的附录给出了笔者采用实验方法得出的恒温槽数学模型,以供进一步研究这类恒温槽及其控制系统时参考。
Digital system A / D and D / A converter reference voltage with temperature changes will have a serious impact on the accuracy of the system, the digital system should be placed in a constant temperature environment. However, if the entire digital system is placed in a constant temperature environment, it is expensive, unnecessary, and sometimes technically difficult to implement. Therefore, it is necessary to use a device with a constant temperature environment - a constant temperature, digital system The key components are placed in a thermostatic bath, thereby increasing the overall temperature stability of the system. Based on the author’s experience in the design and development of the thermostatic bath and its control system, this paper introduces a constant temperature technology and expounds the feasibility of this technology. Finally, the experimental data prove that this kind of thermostatic bath technology can effectively ensure that the key components are close to the local environment of constant temperature, so as to improve the temperature stability of the digital system. The appendix of this article gives the mathematical model of the thermostatic bath which the author adopts the experimental method for reference when further studying such thermostat bath and its control system.