Abstract
Some modes of operation of a digital storage oscilloscope—such as refresh—are similar to the operating modes of an analog oscilloscope, while others such as roll mode have no corresponding counterpart. There is much competition between the designers and manufacturers of digital storage oscilloscopes (DSOs) to produce an instrument which handles like, and gives a display virtually indistinguishable from, an analog oscilloscope. One of the modes of operation of a digital storage oscilloscope which has no counterpart in an analog oscilloscope is roll mode, and this is the first mode to be described in this chapter devoted to digital storage oscilloscope modes of operation. The chapter describes roll mode first not because it is the most useful mode but because it has been available on DSOs from the earliest stage, it is fundamentally different from a conventional scope display, and it leads nicely to the other operating modes of digital storage oscilloscopes.
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