HP 54520 Series - Delay Trigger Mode

Figure 5-10
Trigger
Delay Trigger Mode
Delay Trigger Mode
The delay trigger mode qualifies on an edge, pattern, or state from one
trigger source, waits for a selected period of time or events, then triggers on
the nth edge from any of the other trigger sources. Basically you can think of
delay as two edge triggers that are separated by a selectable time or event
counter.
The traditional method to view events that happen after the trigger event is
to use time base position to pan through the data. The problem with this is
that the further the point of interest is from the trigger event, the greater the
possibility that signal jitter makes it difficult to analyze the point of interest.
Delay by time or events eliminates this problem because it moves the trigger
event closer to the point of interest, which reduces any jitter on long delay
measurements.
For example, a disk drive motor does not spin at a constant speed all the
time. If you use time base delay to look at a pulse separated from the trigger
event by a long time period, the jitter on the pulse caused by variations in the
motor’s speed can make it almost impossible to see the desired pulse. Delay
by time allows you to delay out to the pulse of interest, then trigger on that
pulse. Because you are triggering on the pulse of interest, signal jitter is not
a factor in viewing the pulse.
DELAY TRIGGER
‘ig
[eage patt state
| CEREMD ty glitch
- Qualify on
(GRRE pattern |
L state
eaals
i423
4]