| 摘要 |
A method of measuring the capacitance of a capacitive component (21), whereby a digital bridge with two measuring branches generates a first signal (B 1 ) defined by a train of measuring pulses (M) having a frequency (f 1 ) related to the unknown capacitance being measured, and a second signal (B 2 ) defined by a train of reference pulses (L) having a frequency (f 2 ) related to a reference capacitance (C REF ) of known value; the time difference (”T) between the times (T1, T2) taken by the two measuring branches of the digital bridge to generate an equal number of pulses (Th 1 , Th 2 ) is calculated; the capacitance difference (”C) between the unknown capacitance and the reference capacitance (C REF ) is S determined as a function of the time difference (”T); and the unknown capacitance of the capacitive component (21) is calculated on the basis of the reference capacitance (C REF ) and the capacitance difference (”C). |
