The digital signal differs from the analog signal in several ways, which will be discussed in this chapter. Because of the differences between these two signals, the appearance of a digital scope is quite different from that of an analog scope.
While the digital signal, as with analog, is 1 volt peak-to-peak, some of the components and measurements within that 1 volt are displayed and measured differently on a digital scope. One volt is divided into a thousand units, each referred to as a millivolt, expressed as mV (Figure 14.1). On the graticule, 1 volt of digital video is displayed from –.3 volts (or –300mV) to a peak of .7 volts (or 700mV) for a total of 1 volt. Active digital video is displayed between ...