Tektronix TDS520A User Manual

2Ć5

The triggering system supports a varied set of features for triggering the
signal-acquisition system. Trigger signals recognized include:

H

Edge (main- and delayed-trigger systems): This familiar type of triggering
is fully configurable for source, slope, coupling, mode (auto or normal),
and holdoff.

H

Logic (main-trigger system): This type of triggering can be based on
pattern (asynchronous) or state (synchronous). In either case, logic
triggering is configurable for sources, for boolean operators to apply to
those sources, for logic pattern or state on which to trigger, for mode
(auto or normal), and for holdoff. Time-qualified logic triggering can also
be specified.

H

Pulse (main-trigger system): Pulse triggering is configurable for triggering
on runt or glitch pulses, or on pulse widths or periods inside or outside
limits that you specify. It is also configurable for source, polarity, mode,
and holdoff.

H

Video (with option 05: Video Trigger): Video triggering is compatible with
standard NTSC, PAL, SECAM, and HDTV formats. An additional feature
called FlexFormat

TM 

(flexible format) allows the user to define the video

format on which to trigger.

You can choose where the trigger point is located within the acquired wave-
form record by selecting the amount of pretrigger data displayed. Select
presets of 10%, 50%, and 90% of pretrigger data in the horizontal menu, or
assign the general purpose knob to set pretrigger data to any value within the
limits of trigger position resolution.