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The Trigger Menu
Trigger Position Field
Trigger Position Field
The Trigger Position field accesses a selection menu with the options of
Start, Center, End, User Defined, or Delay. When an option is selected, that
point of the available memory is positioned relative to the trigger. A
representation of this is shown by the blue graphic bar with the "Trig"
indicator line. The Trigger Position field determines how much data is stored
before and after the trigger occurs for
all
subsequent acquisitions.
I
When a Run is started, the analyzer
will
not look for a trigger until at least the
proper percent of pretrigger data has been stored. After a trigger has been
detected, the proper percent of posttrigger data is stored before the analyzer
halts.
Even when the trigger position is set to Start or End, there
will
always be a
small portion of pretrigger and posttrigger data stored.
--....----1
Start
- - -
1
Center
- - -
1
End
___ , User-defined
Delay
Start When the trigger position is set to Start, the starting point of
available memory is positioned relative to the trigger point. This results
in maximum posttrigger data and minimum pretrigger data.
Center When the trigger position is set to Center, the center point of
available memory is positioned relative to the trigger point. This results
in half pretrigger data and half posttrigger data.
5-37
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