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5
To make the most of this list mode,
comprehensive triggering is available
for executing the list entries in the
most useful way for the test program.
Input triggering can be from the front
panel SMB connector, over the VXI
TTL backplane triggers, VXI0-VXI7,
or manually via the SFP. Any one
of the backplane triggers can be
assigned to Trigger In. The Trigger
Out, or settled marker, is a synchro-
nization signal that can be used as a
data-ready flag, a trigger to a meas-
uring receiver, or a timing signal for
the host controller. It is always avail-
able at the front panel. Any one of
the VXI backplane triggers can be
assigned to Trigger Out.
Sync In is a reset trigger. It may be
set to abort a list and reset the list
pointer to the beginning of list mem-
ory. It may be used to run a list. It
may be disabled. Any one of the VXI
backplane triggers may be assigned
to Sync In. Sync Out is the program-
mable marker. Any entry in the list
mode may enable the Sync Out mark-
er. If enabled, it will coincide with
the Trigger Out, or settled marker,
for that list entry. Any one of the VXI
backplane triggers may be assigned
to Sync Out.
Table 2 summarizes the trigger,
marker, and blanking modes.
An example function call to down-
load an array of list entry points is:
ViSTATUS HPE6432_WriteListPoints
(ViSession instrumentHandle,
ViUInt32 startingPoint ViReal64
Frequency[], ViReal64 ALC_value[],
ViInt16 Attenuator[], ViInt16
featureBits[], ViInt16 alcOffset[],
ViUInt32 numberOfPoints);
Once downloaded, the list is execut-
ed by calling Hpe6432_run_list().
Depending on the trigger mode set,
the list is run all the way through,
repeated until aborted, or executed
one entry per input trigger.
Table 2
Trigger In Automatic (default) Trigger In disabled
trigger once wait for trigger, then run list once
triggered wait for trigger to advance to next list entry
Trigger Out settled marker - always enabled
Sync In auto (default) Sync In disabled
wait wait for sync to start list
restart abort list and restart from beginning
wait for start/restart combines wait for start and abort/restart
Sync Out disabled (default) list entry does not generate sync marker on
settled (Trigger Out still enabled)
enabled list entry generates sync marker on settled
(and Trigger Out marker)
Repeat run list continuously until aborted
Blanking enabled (default) blank RF while tuning (minimum 270 µs
settling time on frequency changes)
disabled do not blank RF while tuning
Long blanking disabled (default) frequency settled to within 50 kHz when
Trigger Out edge occurs
enabled RF blanking extended to 350 µs. Frequency
settled to noise level when Trigger Out edge
occurs.
Attenuator switch blanking always extended to 20 ms