Determining capacitance of capacitor, by compensating for current caused by stray capacitance of measuring arrangement e.g. using second capacitor and inverting amplifier

摘要

The method involves directly or indirectly measuring the electric current caused by the capacitance, and during the measurement, compensating for the current caused by the stray capacitance of the measuring arrangement. The compensation involves using a second capacitor (7) and/or a second current-inverting amplifier (6). The first capacitor (1) is disconnected during a calibration step. An Independent claim is included for an apparatus for performing the method.