Device for setting an electric command variable

Communications: electrical – Audible indication – Percussion-type sound producer

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235 92EV, H03K 1304

Patent

active

039952665

ABSTRACT:
A device for setting an electric command variable comprising parallel circuit branches for the coarse and fine adjustment of the variable is disclosed. In particular, the fine and coarse adjustment branches each include a digital bi-directional counter and a digital-analog converter. Upon exceeding the limits of the conversion range of the digital-to-analog converter of the fine branch, the counter therein is adjusted to a value which corresponds to a middle setting of its associated converter. To prevent the latter adjustment from causing a variation of the analog command variable, a corresponding correction of the counter in the coarse branch is then made. The present device has particular application in the setting of the energizing currents in magnetic lenses of an electron microscope.

REFERENCES:
patent: 2928033 (1960-03-01), Abbott
patent: 3763414 (1973-10-01), Clarke

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