19-2233 PC2
2019-02-01
16(50)
ADQ7DC Manual
16-1796 PC2 2019-02-01
16(50)
4.4 Blocking triggers for synchronization
4.4.1
Function overview
In order to synchronize the acquisition to external equipment or to other ADQ digitizers, there is a
mechanism for controlling the flow of triggers. The trigger blocking function allows the user to select
when to activate incoming triggers,
. The basic function of this block is to use the SYNC signal
to frame the trigger signals; for each period of the blocking function, a set of triggers are allowed and
and framed by the blocking event. This creates groups of triggers that belong together. The modes of
operation for trigger blocking are shown in
(j, k, l).
To avoid that the boards start to produce a large amount of records out of sync, all trigger events can
be blocked until the triggers are released by a separate shared signal,
(d). By combining the
trigger blocking and the timestamp reset, the timestamp is aligned to the start of the acquisition. The
trigger blocker source can be most available trigger sources,
Note the order of the commands for activating triggers and trigger blockers,
(e, g, h, i).
illustrates how the triggers are accepted or rejected in the window mode.
#
DESCRIPTION
USER COMMAND
REF
a
External trigger input signal on front panel connector.
b
External sync input signal on front panel connector.
c
Other available sources (see
SetTriggerMode
for a list).
d
Select source for blocking triggers.
SetupTriggerBlocking
e
Before activating the trigger blocking any selected trigger may pass.
SetupTriggerBlocking
f
This signal is ignored as the trigger blocker is not armed
g
Select trigger source
SetTriggerMode
h
Start receiving triggers. Note that triggers are still blocked.
ArmTrigger
i
The unblocking of triggers is armed and can be activated by (d).
ArmTriggerBlocking
j
Triggers are blocked until the first accepted blocker signal.
SetupTriggerBlocking
k
The trigger blocker can also be set up with a window function where
triggers are accepted or rejected during a user-defined window.
SetupTriggerBlocking
l
The trigger blocker can also be set up as a gate where triggers are
accepted during a gated time set by signal (d).
SetupTriggerBlocking
Figure 7: Blocking and gating of triggers.
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