User manual

Operator's Manual
Trigger Types
These are the trigger types available for selection. If the trigger is part of a subgroup (e.g., Smart), first
choose the subgroup from among the basic types to display all the trigger options.
Basic Triggers
Edge triggers upon a achieving a certain voltage level in the positive or negative slope of the waveform.
Width triggers upon finding a positive- or negative-going pulse width when measured at the specified voltage
level.
Pattern triggers upon a user-defined pattern of concurrent high and low voltage levels on selected inputs. In
Mixed-Signal oscilloscopes, it may be a digital logic pattern relative to high and low voltage levels on analog
channels, or just a digital logic pattern omitting any analog inputs. Likewise, if your oscilloscope does not
have digital input capability, the pattern can be set using voltage levels on analog channels alone. You can
stipulate the voltage level/logic threshold for each analog or digital input independently.
TV triggers on a specified line and field in standard (PAL, SECAM, NTSC, HDTV) or custom composite video
signals.
Qualified arms the trigger on the A event, then fires on the B event. In Normal trigger mode, it automatically
resets after the B event. The A event can be an Edge, State, Pattern, or PatState (a pattern that persists over
a user-defined number of events or time). The options for the B event depend on the type of A event. If A is a
digital Pattern or PatState, B can only be an Edge.
NOTE:This functionality is identical to Teledyne LeCroy's previous Qualify and State triggers, but presented
through a different user interface.
Smart Triggers
The Smart subgroup triggers allow you to apply Boolean logic conditions to the basic signal characteristics
of level, slope, and polarity to determine when to fire the trigger.
Window triggers when a signal exits a window defined by voltage thresholds.
Interval triggers upon finding a specific interval, the time (period) between two consecutive edges of the
same polarity: positive to positive or negative to negative. Use the interval trigger to capture intervals that
fall short of, or exceed, a specified range.
Dropout triggers when a signal loss is detected. The trigger is generated at the end of the timeout period
following the last trigger source transition. It is used primarily in single-shot applications with a pre-trigger
delay.
Runt triggers when a pulse crosses a first threshold, but fails to cross a second threshold before re-crossing
the first. Other defining conditions for this trigger are the edge (triggers on the slope opposite to that
selected) and runt width.
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