Teledyne LeCroy ArbStudio - Manual (Page 106)

ArbStudio
98 922244-00 Rev A
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ONDITIONS ON LOGIC LEVELS
You can indicate whether the trigger condition must be detected on a high
or low logic level for each signal. When trigger conditions are set on logic
levels of several signals, the trigger event is determined by the occurrence
of all conditions simultaneously.
If no trigger conditions on logic levels are set for any signal, the trigger
conditions on logic levels are always considered verified.
The trigger condition set on logic levels is useful when the trigger event
must be detected for a specific pattern.
Use the Level Condition drop-down field to select among the following
conditions for trigger events on logic levels:

Trigger when EQUAL - The trigger event occurs when the state of
the evaluated signals is equal to the specified pattern.

Trigger when NOT EQUAL - The trigger event occurs when the state
of the evaluated signals is different from the specified pattern.

Trigger when CHANGED - The signals selected for a trigger event on
logic levels are examined when data acquisition starts. These
sampled values constitute the reference pattern. The trigger event
occurs when the state of the selected signals is different from the
reference pattern.
The conditions chosen by the user on logic levels are ignored.
ArbStudio uses the information related to channels for trigger
detection.
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ELATIONSHIP BETWEEN TRIGGER CONDITIONS
Relationships between trigger conditions on edges and trigger conditions
on logic levels can be set using the Trigger condition drop-down field. The
following options are available:

Edge OR Level - A trigger condition occurs when one between an
edge condition or a logic level condition is detected.

Edge AND Level - A trigger condition occurs when an edge condition
and a logic level condition are simultaneously satisfied.

Edge BEFORE Level - A trigger condition occurs when an edge
condition is detected at least once before one is detected on logic
levels.