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设计和制作精密恒温系统是“频率源”研制者普遍关心的问题。本文利用电和热闭合循环的概念阐述了精密恒温系统的工作原理,提出了恒温槽设计的一般原则,并对直流桥式控温电路进行了较为详细的分析,指出了槽内温漂与元器件噪声特性的某些规律,特别着重说明了在制作技术上如何实现高控温精度的措施,最后给出了实验结果。整个恒温系统能保证工作在(-10℃-+20℃)、(+20℃-+45℃)条件下其温度缩减因子(预热4小时)分别为1/5102、1/3472,控温精度优于千分之一。
Design and production of precision thermostat system is “frequency source” developers generally concerned about the problem. In this paper, the working principle of the precision thermostat system is expounded by the concept of electrical and thermal closed cycle. The general principle of thermostatic bath design is put forward. The direct current bridge temperature control circuit is analyzed in detail. Some characteristics of the noise characteristics of the device, with particular emphasis on how to achieve high temperature control precision in the production of measures, and finally give the experimental results. The whole temperature control system can guarantee the working temperature (-10 ℃ - +20 ℃), (+20 ℃ - +45 ℃) under the conditions of its temperature reduction factor (preheating 4 hours) were 1 / 5102,1 / 3472, temperature control Accuracy better than one thousandth.