
Digital storage oscilloscopes
Refresh mode
18
to that of the single shot mode of a conventional oscilloscope with
camera or an analog (tube) storage oscilloscope, with the big
difference that with these one cannot capture pretrigger
information.
It was mentioned in the previous chapter that when the sample
rate (the equivalent of timebase speed in ordinary oscilloscope
parlance) becomes too high, the display in roll mode is no
longer useful, as the trace appears to rush across the screen
and off the left hand side too fast for the eye to be able to make
anything of it. In this case, if the waveform is a stable ...