Abstract
AbstractThe electrostatic surface potentiometer has the feature that the distance compensation effect is included and the fast transient phenomenon can easily be observed. On the other hand, the noise is increased when a wideband is realized while maintaining a high input resistance. When a low potential is to be measured or the area of the measuring electrode is decreased aiming at a high resolution, a limit of performance is produced. The investigation of this point is not yet sufficient.This paper derives the formula for the bandwidth of the amplifier, which is needed in the design and construction of such a surface potentiometer. Using the angular frequency and the output noise voltage as the parameters, a formula is derived which relates the amplification A to the capacitance between the sample and the sensing electrode. Those results were verified by experiment. The operating region for A and m (which is the ratio between the capacitance between the sample and the sensing electrode, and the input capacitance of the potentiometer) is useful in the design and construction of the potentiometer.
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