A switched-battery digital capacitance meter
Andrzej Rusek, Syed Masud Mahmud · IEEE Transactions on Instrumentation and Measurement · 1986
A digital capacitance meter based on the RC discharge with battery voltage polarity switching is described. The meter parameters — resolution, linearity, and accuracy — have very low sensitivity to variations in internal meter circuits and to changes of internal switch parameters. Automatic control of changing phase timing reduces the initial condition error of the measurements. The proposed meter is intended for use in applications where precise measurements of small capacitance changes are required.