An Improved dc Power Regulator
Temperature control of a spontaneously cooling object by means of regulated electric heating may be achieved with a low-level, dc amplifier of thermocouple or bridge signals [1,2] together with a dc power-regulating amplifier [3–6]. The use of dc heating current avoids ac pickup by low-level circuits in the cryostat. Although dc amplifier circuitry is well known [7–10] the modification of direct-coupled circuits, for purposes other than the original design, may be surprisingly difficult.
KeywordsPower Regulator Output Impedance Output Circuit Cryogenic Engineer Steady State Versus
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