7–3
On average, 104 trigger events are needed to complete an
acquisition. But sometimes many more are needed. These
segments are interleaved to provide a waveform covering a time
interval that is a multiple of the maximum single-shot sampling
rate. However, the real-time interval over which the waveform
data are collected is orders of magnitude longer and depends on
the trigger rate and the desired level of interleaving. The
oscilloscope is capable of acquiring approximately 40 000 RIS
segments per second.
Roll Single-shot acquisitions at timebase settings slower than
0.5 s/div (10 s/div for traces with more than 50 000 points) have
a sufficiently low data rate to allow the display of the incoming
points in real time. The oscilloscope shows the incoming data
continuously, “rolling” it across the screen, until a trigger event is
detected and the acquisition completed. The latest data is used
to update the trace display in the same manner as a strip-chart
recorder. Waveform Math and Parameter calculations are done
on the completed waveforms.
Sequence Sequence Mode is an alternative to single-shot acquisition that
offers many unique features. The complete waveform consists
of a number of fixed-size segments acquired in Single-Shot
Mode (see Appendix A for the limits), which are able to be
selected. .
The dead time between the trigger events for consecutive
segments can be kept to under 50 µs — in contrast to the
hundreds of milliseconds normally found between consecutive
single-shot waveforms. Complicated sequences of events
covering a large time interval can be captured in fine detail,
ignoring uninteresting periods between events. And time
measurements can be made between events on different
Note: to ensure low deadtime between segments,
button-pushing and knob-turning is to be avoided during
sequence acquisition.
Note: The behavior of , ,
and
is modified in
Roll Mode and Sequence Modes (refer to previous chapter
and pages 7–8 and 7–9).
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