oscillographic recording system

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oscillograph — oscillographic, /euh sil euh graf ik/, adj. oscillography /os euh log reuh fee/, n. /euh sil euh graf , grahf /, n. Elect. a device for recording the wave forms of changing currents, voltages, or any other quantity that can be translated into… … Universalium
Digital protective relay — In electrical engineering of power systems, a digital protective relay uses a microcontroller with software based protection algorithms for the detection of electrical faults. Such relays are also termed as microprocessor type protective relays.… … Wikipedia

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