User manual

Acquisition

Trigger Types

The Trigger Type sets the triggering conditions. Special MultiStage types allow one set of conditions for

arming and another (same or different) set for triggering.

If a type is part of a subgroup (e.g., Smart), first choose the subgroup to display all the trigger options.

Basic Types

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 voltage levels on analog channels,

or just a digital logic pattern omitting any analog inputs. Likewise, if your oscilloscope does not have Mixed-

Signal capability, the pattern can be set using analog channels alone.

TV triggers on a specified line and field in standard (PAL, SECAM, NTSC, HDTV) or custom composite

video signals.

Serial triggers on the occurrence of user-defined serial data events. This type will only appear if you have

installed protocol-specific serial data trigger and decode options.

Qualified arms on the A event, then triggers on the B event. In Normal trigger mode, it automatically resets

after the B event, and re-arms upon the next matching A event.

Note: This functionality is identical to Teledyne LeCroy's previous Qualify and State triggers, but

presented through a different user interface.

Smart Triggers

Smart triggers allow you to apply Boolean logic conditions to the basic signal characteristics of level, slope,

and polarity to determine when to 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 acquisitions with 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.