| 摘要 |
<p>The invention relates to a sampling module (30), for sampling one or more analogue characteristics of a power transmission system, comprising at least one input circuit for sampling a respective analogue characteristic, the or each input circuit including: a scaling circuit (34) for reducing the magnitude of the analogue characteristic to a desired level; an isolating circuit (40) for creating an electrical barrier between respective upstream and downstream portions of the input circuit; and an analogue to digital converter (22) for digitising the analogue characteristic to produce a digital data stream, the scaling circuit (34) being electrically connected to an input of the analogue to digital converter (22) and the isolating circuit (40) being electrically connected directly to an output thereof.</p> |
