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Equivalent–time sampling (ETS)
Most Digital Storage Oscilloscopes (DSOs) feature equivalent–time sampling (ETS). ETS allows a digital oscilloscope to capture high–frequency signals with a much higher effective sampling rate.
Equivalent–time sampling works by constructing a picture of the input signal by accumulating the samples over many wave cycles. Because ETS samples the waveform over a number of cycles it can only be used to measure signals that are repetitive. ETS cannot be used for single–shot or non–repetitive signals.