Teledyne LeCroy HDO 4000 Operators Manual - Manual (Page 48)

HDO4000 High Definition Oscilloscope
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 wave.
Width triggers upon finding a positive- or negative-going pulse width when measured at the specified
voltage level.
Qualified A-B arms the trigger on the A event, then triggers on the B event. If the arming event (A) is a
pattern that occurs once (Pattern) or that occurs and remains satisfied (PatState), then the triggering
event (B) can be an Edge, Width, Glitch, or Interval condition.
NOTE: This functionality is identical to Teledyne LeCroy's previous Qualify and State triggers, but
presented through a different user interface.
Available as a sub-type of Qualified triggers, PatState triggers when the qualifying signal goes above or
below a specified voltage level. You can specify the number of these events that must occur to trigger.
Pattern triggers on a logical combination of analog or digital inputs: CH1, CH2, CH3, CH4, EXT, and D0-
D15. You have a choice of four Boolean operators (AND, NAND, OR, NOR) and can stipulate the high or low
voltage logic level for each input independently.
NOTE: Only the AND Boolean operator is available when combining analog and digital inputs.
TV triggers on standard (PAL, SECAM, NTSC, HDTV) or custom composite video signals.
Smart Triggers
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.
Glitch triggers upon finding a fixed pulse-width time or time 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.
SlewRate triggers when the rising or falling edge of a pulse crosses an upper and a lower level. The pulse
edge must cross the thresholds faster or slower than a selected period of time.
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