8588A/8558A
Operators Manual
108
Note
The Arm1 and Arm2 layer “Auto” delays are always zero. The
Trigger layer “Auto” delay can be a finite value, based on the signal-
path configuration, but no delay may actually be experienced. For
example, the Auto delay begins when a signal path configuration is
changed and expires before the Trigger subsystem reaches that
point in the cycle. In that case zero delay will occur.
Trigger Setup Menu
The initial Trigger Setup menu is organized for easy access to the Trigger layer,
which is the layer prior to the actual signal acquisition. Push to set the
parameters found in Details of the Triggering Subsystem. A wide variety of
triggering operations can be performed by controlling the Trigger layer alone,
leaving the other layers in their default state. Access to the complete triggering
subsystem (Initiate, Arm2, Arm1 and Triggering layers) is through the
(Extended Settings) softkey.
Note
Given the complex nature of the triggering subsystem, when a specific triggering
setup is desired, pushing the Reset to Defaults softkey first is recommended
before any parameters are set.
iei031.png
The first row of the Trigger Setup screen, Trigger Event, determines which of the
settable events are used to affect triggering in the Trigger layer. The default
event setting is Immediate which gives continuous, automatic triggering.
The second row of the Trigger Setup is context sensitive, and may or may not
have information, see the screen below:
The event settings that have additional information, and settable parameters are:
External: Triggering is based on the signal that appears at the Product’s rear
panel TRIG IN BNC connector. The available settings are made with , and
are TTL Negative, TTL Positive, Bipolar Negative, and Bipolar Positive. The
External Trigger Edge default is TTL Negative.
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