
Chapter 4
Software Reference
© National Instruments Corp.
4-11
GPIB-410 User Manual
•
You type <Alt-T> again.
•
The last pattern in the pattern sequence is matched.
If the entire pattern sequence is satisfied before triggering is disabled,
the selected trigger action is taken. While the GPIB-410 waits for a
particular pattern to occur the pattern label is highlighted.
Keep the following points in mind when defining the Trigger Spec.
•
The GPIB-410 hardware can detect only one trigger pattern at a
time without reprogramming.
•
The multi-pattern, repeating trigger capability of the GPIB-410 is
implemented in software. If two events matching consecutive
patterns occur within a sufficiently small time interval, it is possible
the second event will be missed.
•
If the selected trigger action is
TRIGGER
with
position:
TTTTT
, background capturing may be started when the trigger is
armed. If so, following satisfaction of the pattern sequence there is
a brief capture adjustment period, during which time it is possible
that some capture entries may be missed or lost.
•
The likelihood of losing trigger or capture events can be reduced or
eliminated by configuring the GPIB-410 to participate in the
acceptor handshake while capturing (see Capture Settings screen)
or by enabling the "dummy" ACP handshaker <Alt-A>.
•
For triggering a capture operation, the following Trigger Spec is the
least dependent on software intervention and the most efficient.
1 WAIT FOR
<single trigger pattern>
0001 time
then
TRIGGER with position:
T
The Trigger Specification screen contains the following fields.
•
Data/Control Specification
•
Trigger Repeat Factor