Agilent Technologies 54622A User Manual page 41

Auto-Single mode
In Normal trigger mode, the oscilloscope will not trigger or display a waveform
unless a trigger signal is present and trigger conditions are met. In this trigger
mode, each time Single is pressed, the oscilloscope will wait for a valid trigger.
In Auto or Auto Lvl trigger mode, the oscilloscope will generate a trigger for you
if one is not found in the predetermined time from when the trigger system is
armed. To take a single-shot acquisition, if you are not particularly interested
in triggering the acquisition (for example, if you are probing a known signal),
use this auto-trigger mode (auto-signal mode). If a trigger exists, it will be used;
if a trigger does not exist, an untriggered or auto-triggered acquisition will be
taken for later analysis.
Using Vectors (Display menu)
One of the most fundamental choices you must make about your display is
whether to draw vectors (connect the dots) between the samples, or simply let
the samples fill in the waveform. To some degree, this is a matter of personal
preference, but it also depends on the waveform.
• You will probably operate the oscilloscope most often with vectors on. Having
vectors on slows the display of the oscilloscope, thus works better for slower
sweep speeds, peak detect, or average displays, and signals with stable
triggers.
• Having vectors off works better for fast sweep speeds, normal displays, or
unstable triggers. Complex analog signals like video and eye diagrams show
more intensity information with vectors off. Turn vectors off when the
maximum display rate is required, or when highly complex or multi-valued
waveforms are displayed.
Delayed Sweep
Delayed sweep is a simultaneous display of the waveform at two different sweep
speeds. Because of the deep memory in the MegaZoom technology, it is possible
to capture the main display at 1 ms/div, and redisplay the same trigger in the
delayed display at any desired faster time base.
There is no limit imposed on the zoom ratio between the main and delayed
displays. There is, however, a useful limit when the samples are spaced so far
apart that they are of little value. See the "MegaZoom Concepts and
Oscilloscope Operation" chapter for more information about delayed sweep and
time reference.
Front-Panel Overview
Important Oscilloscope Considerations
2-5