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A thermostat at a temperature of 33.50 °C was constructed for noise measurements on electronic devices for periods of days. A stabilization factor with respect to room temperature fluctuations of over 4×104 is achieved. Upper limits are determined for stray magnetic field fluctuations as ‖Ḃ‖⩽0.3 μT/sec, and for electric fields as ‖E‖⩽8 μV/m, measured in the frequency range 10−4 Hz
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Boehm et al. (1976) studied this question.
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