User's Manual

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Chapter 2: Probing and Selecting the Sampling Mode
Choosing the Sampling Mode
See Also “Understanding State Mode Sampling Positions” on page 256
“To automatically adjust sampling positions” on page 49
In Either Timing Mode or State Mode
“To specify the trigger position” on page 53
“To set acquisition memory depth” on page 53
“To name an analyzer” on page 54
“To turn an analyzer off or on” on page 54
To specify the trigger position
1. In the Sampling tab (or in the Settings subtab of the Trigger tab), select
the trigger position.
Specify whether you want to look at data after the trigger (Start), before
and after the trigger (Center), before the trigger (End), or use a
percentage of the logic analyzer's memory for data after the trigger (User
Defined).
In the timing sampling mode's 800 MHz / 64M Sample Conventional
configuration, when a Run is started, the analyzer will not look for a
trigger until the specified percentage of pretrigger data has been
stored. After a trigger has been detected, the specified percentage of
posttrigger data is stored before the analyzer halts. This ensures that
both pretrigger and posttrigger storage are complete.
In the state sampling mode, or in the timing sampling mode's 400 MHz
/ 32M Sample Transitional or Store Qualified configuration, when a
Run is started, the analyzer immediately looks for the trigger condition.
In other words, the trigger position setting specifies the maximum
amount of data that should be stored before the trigger.
To set acquisition memory depth
If you need less data and want measurements to run faster, you can
limit the number of samples that are stored in logic analyzer acquisition
memory.