| 摘要 |
<p>A fault detection apparatus (230), for use in the alphanumeric display of e.g. a glycometer, comprises a signal translation stage (232) having an input arranged to receive an input waveform (500) derived from a signal for a capacitive load (210). The signal translation stage (232) is arranged to generate a translated output signal, e.g. a bit having a state of either logic 1,0 or an intermediate state, representative of at least an aspect of the input waveform. The apparatus also comprises a detection stage (234) arranged to receive the translated output signal from the signal translation stage (232) and analyse a first part and a second part of the translated output signal respectively corresponding to a first step function and a second step function, the first and second step functions being opposite in direction of transition. The analysis performed by the detection stage (234) is a comparison of the first and second parts of the translated output signal respectively with an expected first part and an expected second part of the translated output signal.</p> |
