Tektronix CSA7404B, User Manual

Page: 172 / 438

Triggering
3- 104
CSA7000B Series & TDS7000B Series Instruments User Manual
You can set the trigger delay time with the keypad or the multipurpose
knobs.
H
Trigger on n
th
Event: After the A trigger arms the trigger system, the
instrument triggers on the n
th
B event. You can set the number of B events
with the keypad or the multipurpose knobs.
NOTE
. The traditional delayed trigger mode called “Runs After” is served by
Horizontal Delay. You can use horizontal delay to delay acquisition from any
trigger event, whether from the A (Main) trigger alone or from a sequential
trigger that uses both the A (Main) and B (Delayed) triggers. See
Triggering
with Horizontal Delay On on page 3--106 for more information.
Read the following topics; they provide details that can help prevent false steps
in setting up to trigger on your waveforms.
Trigger Sources. In most cases, it makes sense to set separate trigger sources for
the A (Main) and B (Delayed) triggers. Line is not available as a source for the B
trigger.
Trigger Types.
When using sequential triggering, both the A trigger and B trigger
systems can be set independently to any one the following types: Edge, Glitch,
Width, Timeout, Runt, Transition, Window, Setup/Hold, Pattern, or State. Except
for Pattern and State, all of these types can be logic qualified. Comm and Serial
trigger cannot be logic qualified, nor are they available with B triggers.
Triggering with Horizontal Delay Off. Figure 3--28 compares the sequential trigger
choices A-Only, Trig After Time, and Trig on n
th
Event when horizontal delay is
off. Each illustration shows where pretrigger and posttrigger data is acquired
relative to the trigger event.
Using Sequential
Triggering