Teledyne SP Devices ADQ7DC, Manual

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2019-02-01
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ADQ7DC Manual
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4.11.2 Frame sync output on SYNC connector
The frame sync feature enables grouping of trigger signals into frames or blocks or lines. The name for
this feature relate to the actual application. This function can, for example, be used in scanning three-
dimensional measurements where a record is the first dimension, the trigger is the second and the
frame sync is the third dimension.
The frame sync count triggers and output a signal at a certain period. The period is measured in trigger
events.
4.11.3 Trigger event indicator
The trigger output can be used for indicating that trigger event occurred in the digitizer. A trigger event
is some event that causes the digitizer to trigger. When used as a trigger event indicator all trigger
events are presented at the trigger output port,
Figure 18 (a, b) illustrates how trigger events appear at
the trigger output. The trigger events at Figure 18 (c) will generate a record. The event Figure 18 (d),
however, occurs while the recording is ongoing and will thus not generate a record.
Note that the timing of the trigger event in the capturing of a record is based on the Sample Clock but
the trigger output is based on the Data Clock.
4.11.4 Triggering external equipment with internal trigger
Triggering external equipment and the digitizer with the internal trigger may be done in two ways; inter-
nally,
Figure 19 and externally, Figure 20 .
The internal connection is preferred when the trigger is only used for triggering the digitizer. The trigger-
ing is then done inside the FPGA as a logical signal and the trigger time is guaranteed to be exact on
the expected sample.
The external connection is preferred when the trigger is used for triggering both the digitizer and the
external equipment. Then the ADQ will listen to the same physical signal as the external equipment is
using.
# DESCRIPTION USER COMMAND REF
a Level trigger generates trigger events.
b Trigger output of the the level trigger events. SetupTriggerOutput
c Accepted trigger events create records.
d This trigger event is falling within the recording and is discarded by the
acquisition control. This trigger will not create any new record.
Figure 18: Trigger event output for a level triggered system.
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