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Sustained Sample Rate in Digital Oscilloscopes

One of the most basic specifications in digital oscilloscopes is the maximum sample rate. Oscilloscope users often understand the theory of signal sampling and signal reproduction, but often mistakenly assume that the oscilloscope always samples at its maximum sample rate. In reality, two specifications need to be considered: the maximum sample rate and the acquisition memory behind the signal sampler. At all but a few of the fastest sweep speeds, the acquisition memory depth and not the maximum sample rate determines the oscilloscope’s actual sample rate and consequently how accurately the input signal is represented on the oscilloscope display. The deeper the acquisition memory, the longer the oscilloscope can sustain a high sampling frequency on slow time-per-division settings, thus increasing the actual sample rate of the oscilloscope and improving how the input signal looks on the oscilloscope screen.