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专利名称：Zeroing circuit
发明人：Anthony Jenkins,Douglas Walter Isgrove申请号：US05/488650申请日：19740715公开号：US03955139A公开日：19760504
摘要：Baseline drift and noise can produce difficulties in registering signals
quantitatively without recourse to frequent rezeroing of the registering instrument. Theinvention provides a circuit in which the registering instrument only functions when arequired signal is to be noted, the instrument at all other times being at a zero reading.The characteristics of a signal to be registered will be known. The circuit includes adifferentiator which notes the rate of change of incoming signals and operates a
switching device upon detecting a required rate of change to enable the signal to pass tothe registering instrument. At all other times the registering instrument is isolated by theswitching device. A comparator circuit can also be included to measure the magnitude ofthe signals which have the required rate of change as determined by the differentiatorand to prevent the passage of signals to the registering instrument which fail to reach apredetermined magnitude, for example a magnitude of 10% of full scale deflection ofthe registering instrument.
申请人：ANALYTICAL INSTRUMENTS LIMITED
代理机构：Woodhams, Blanchard and Flynn
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