An electronic regulator is described that is capable of controlling the temperature of a liquid-helium bath within ±10 μdeg for a few minutes and reducing long-term drift to less than 40 μdeg/h. With occasional adjustment, the temperature can be indefinitely maintained within ±10 μdeg. The circuit is designed to be used with a resistance thermometer bridge previously described. The error signal from the bridge is displayed on a meter, so that the bridge can be balanced without use of an oscilloscope and the performance of the regulator can be continuously monitored.
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Blake et al. (1963) studied this question.
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