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The frequency spectrum of the noise associated with prebreakdown currents in insulators has been investigated in the audio-frequency range. Most of the noise is due to surface discharges which can be eliminated by special types of electrodes and careful experimentation. The remaining noise has a frequency spectrum with the highest amplitudes at very low frequencies; it falls rapidly to the Johnson noise level in the measuring resistor at about 104 cps. This noise apparently originates from fluctuations in the field-emission current.
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Powers et al. (1955) studied this question.
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