CAPACITANCE-MEASURING APPARATUS INCLUDING MEANS MAINTAINING THE VOLTAGE ACROSS THE UNKNOWN CAPACITANCE CONSTANT

摘要

The total voltage across a series resistance-capacitance circuit (wherein the capacitance is that of a measuring probe) supplied by an alternating current source is controlled so as to maintain the voltage across the capacitance constant as the measured capacitance varies. This provides a linear total voltage-capacitance characteristic over a wide capacitance range. The effects of temperature and aging on component values are eliminated by continuously correcting the slope of the voltage-capacitance characteristic.