![]() ![]() Generally we talk about single input oscilloscope in which a single signal is studied at a time but it becomes insufficient when comparison between two signals is to be done because it requires simultaneous study of both signals on the same screen. Because of this unpredictability of electrical signal that makes the use of such instruments like oscilloscope. These variations can be dependent or independent of time and it is this relationship that classifies them as random and determinate signals. These variations are then distinguishable as between two wave forms. ![]() Thus, it works like a device that helps in visualizing the variations in voltage or current levels of the concerned signal. We are already familiar with the operation and circuitry of a general purpose oscilloscope having an input at its input terminal in electrical form and produces the wave form in its accord.
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