Trigger Types - HP 54645A User's And Service Manual

Triggering HP 54645A/D Oscilloscopes

Trigger types

Trigger types
These trigger types are available:
Edge trigger
Pattern trigger
Advanced trigger
Changes to the trigger specification are applied when you make them. If the
oscilloscope is stopped when you change a trigger specification, the scope
will use the new specification when you press Run/Stop, Single, or Autostore.
If the oscilloscope is running when you change a triggering specification, it
uses the new trigger definition when it starts the next acquisition. You select
the trigger type by pressing the key associated with the desired trigger type.
Edge Trigger
In edge trigger, you define a single rising or falling edge that must be
recognized on any input channel to satisfy the trigger condition.
Edge trigger is best when there is a unique waveform edge that defines the
events you want to capture. For example, a pulse that defines the beginning
of a pulse train on another channel will often make a good edge trigger.
Edge triggering is the simplest trigger mode, and the easiest to use. However,
its simplicity can lead to situations where more triggering power is needed.
Often the device under test needs more than a single rising or falling edge to
locate a specific point in its operation.
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