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An instrument for measuring the cross-spectral density of two random variables which are correlated is described. It was constructed to study the relationship between electron density fluctuations and the ambipolar diffusion coefficient in a plasma. A stability in the zero correlation level of 10−3 is achieved by use of one-bit digital electronics in the multiplier and integrator. An analysis of the design and function of the instrument is given together with a discussion of possible instrumental errors and statistical uncertainties in the measurements.
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Ray et al. (1968) studied this question.
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