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Measurement of the Hall effect in oxide crystals of high resistivity has been made possible by the use of a very high impedance ac apparatus. The shunt capacitance of leads degrades the input impedance in such a system. However, this effect is minimized by driving the shield of the coaxial line from a low impedance source with a voltage of the same amplitude and phase as that of the input signal. The frequency is chosen sufficiently high to minimize the effects of space charge.
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Olson et al. (1970) studied this question.
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