74 CBLé System Guidebook
Miscellaneous Reference Information
(Continued)
Asynchronous/ Synchronous Triggering vs. Record Time
Actual triggering is asynchronous from the internal sampling clock for
either of the following:
¦ Trigger Type in
CMD3
is set to 1 or 6 (manual triggering).
¦ Trigger Channel in
CMD3
is set to 21 (external clocking using 1 of 7
hardware trigger values) and Sample Time is not 0.
The actual sample time for the trigger point depends on whether or not
prestore is selected in
CMD3
.
When prestore and relative record time are selected, the sample time for
the trigger point will generally not be identical to times around it. The
time recorded for the trigger point will be the actual time between the
previous sampled point on the internal sampling clock interval and the
asynchronous trigger event. The sample taken after the trigger point will
be at the specified sample time since the clock is reset each time the
trigger event occurs (pressing N or the hardware threshold trigger
event).
When Trigger Type is set to 6 (Manual and Sample Trigger) in
CMD3
, the
recorded sample times are the actual relative times when N is
pressed.
When no prestore is selected, the first sample time will be the trigger
point. Its recorded time will not be the internal sample clock time
because the CBL is always sampling on the internal clock interval that
you selected, and is storing points (if you selected prestore) until the
trigger event occurs.
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