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HP E1432A Triggering.
The following is a short discussion of triggering for the HP E1432A.
Triggering is defined as the transition from the armed state to the triggered
state. This transition is caused by a low going edge on a TTL trigger line.
The function hpe1432_getTtltrgLines selects which of the eight TTL trigger
lines is to be used.
The low-going transition of the TTL trig line can be caused by any of the
following items:
trigger type enabling function
the AUTO TRIGGER circuitry hpe1432_setAutoTrigger
the hpe1432_triggerMeasure function hpe1432_triggerMeasure
a source trigger hpe1432_setTriggerChannel
a tach trigger hpe1432_setTriggerChannel
an external trigger hpe1432_setTriggerExt
an input level or bound trigger event hpe1432_setTriggerChannel
and hpe1432_setTriggerMode
Each of these trigger sources can be enabled or disabled independently, so
quite complex trigger setups are possible. In all cases, however, the first
trigger event kicks off the measurement and the following trigger events
become superfluous.
Note that for hpe1432_setAutoTrigger the setting
HPE1432_MANUAL_TRIGGER really means “don’t auto trigger” not “expect
a manual trigger”.
For single-HP E1432A systems, the TTL trigger signal is not connected to
the VXI backplane. For multiple HP E1432A systems, the
hpe1432_initMeasure function connects the HP E1432A trigger lines to the
VXI backplane, and at that point, your selection of which TTL trigger lines
through hpe1432_getTtltrgLines is relevant. Multiple mainframe systems will
need to account for the unidirectional nature of the inter-mainframe MXI
extenders which will prevent all but the “upstream” mainframe from
triggering the system.
HP E1432A User's Guide
Using the HP E1432A
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