β Scribed by P. Van Hecke; L. Van Gerven
No coin nor oath required. For personal study only.
A description is given of an electronic system for temperature regulation purposes, which continuously regulates and stabilizes the heater current as a function of the error signal delivered by a Wheatstone bridge and amplified by a d c null amplifier. D C amplification also allows the use of a thermocouple sensing element (put in opposition with an adjustable voltage reference source).
The current stability obtained is better than lOO p p m. In consequence, power fluctuations in the heater, due to the electronic system, are negligible.
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