As the popularity of Digital Storage Oscilloscopes has grown, a need has arisen for understanding their operating modes and performance characteristics. This technical brief describes two of the fundamental modes of waveform acquisition utilized in Tektronix products. Knowledge of the benefits and trade-offs of Real-Time and Equivalent-Time sampling will make it easier to choose and use a Tektronix digital storage oscilloscope. Appended to this tech brief is an explanation of the Sin(x)/x interpolation method that Tektronix DSOs use to produce high resolution timing and amplitude measurements and extremely accurate displays. The performance of the DSO continues to evolve toward an analog-type performance level. Higher sample rates allow mid-range digital scopes to acquire single shot waveforms with a level of timing accuracy rivaling the capabilities of premium DSOs. The standard sampling rate for these reasonably priced scopes has grown exponentially from a 50 or 100 MS/s rate to 2 GS/s.

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