HP 54620A, User'S And Service Manual

Page: 75 / 243

To define an advanced trigger
1
Press
Adv
.
2
Press the
Overview
softkey to turn on the trigger overview, if desired.
The trigger overview display simplifies the trigger setup by allowing you to
see the current source and operator selections and source definitions
(pattern and edge definitions).
3
Choose the trigger operator by pressing the
Operator
softkey until
the desired operator is shown.
Table 3 lists the trigger operators and the sources with which they can be
used. Notice that the sources specified (in step 5) can limit your choice of
trigger operators, and your choice of trigger operators can limit which
sources are available.
4
Set the parameters for the trigger operator, if necessary.
For the Duration > and Duration < operators, press the duration value
softkey or turn the Entry knob to set the duration. You can set the minimum
duration available by pressing the
Minimum Duration
softkey.
For the Occurrence operator, press the
Occurrence
softkey or turn the
Entry knob to set the number of occurrences. You can reset the number of
occurrences to 1 by pressing the
Minimum Occurrence
softkey.
5
Choose the source(s) for the trigger operator by pressing the leftmost
softkey under each “Source” heading until the desired source is
highlighted.
Table 3 lists the sources and the operators with which they can be used. Note
that the analyzer will allow you to choose combinations of sources that are
redundant, such as “Pat_1 AND Pat_1,” or that will create a null trigger
condition, such as “Pat_1 AND Not = Pat_1.”
6
Set up the source(s) by pressing the
Define
softkey under the
“Source” heading for the desired source.
If you have combined patterns and edges in the same source term, you will
need to separately select each as the source (step 5), set up the source
(step 6), then re-select the combined pattern and edge.
To set up an edge source:
a
Select a channel using the Select knob or the Entry knob.
•
To choose whether the trigger will occur on the rising edge, falling
edge, or both edges of the input signal, press one of the
Edge
softkeys.
Making Analyzer Measurements
To define an advanced trigger
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