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Chapter 15 Menus and Dialog Boxes 343
Control Buttons:
OK:
Saves the specified parameter values and closes the dialog box, returning you to
the PTG window.
Cancel:
Closes the dialog box without saving any of the specified values.
Help:
Accesses context-sensitive help for this window.
PTG Triggers tab page
The PTG Triggers tab page allows selection of the Input Trigger mode, Input or
External. It additionally allows the Frequency (Internal Trigger mode) and Trigger
Selection parameters (External Trigger mode) to be set. See Chapter 13 for additional
information on pulser/timing generator operation.
Parameters
Trigger Frequency:
The trigger frequency is used with internal triggering.
Trigger Mode radio buttons:
The trigger mode determines whether the PTG will
create its own trigger signals (
Internal
), or will itself be triggered by trigger
signals that originate in an external piece of equipment (
External
).
Threshold:
In the External trigger mode,
Threshold
sets the required height the
applied trigger must be to trigger the PTG.
Coupling:
Allows you to select whether the trigger will be ac or dc coupled.
Slope:
In the External trigger mode, the
Slope
radio buttons allow you to choose
whether the PTG will be triggered on the positive-going or negative-going edge
of the applied trigger.
Figure 303.
Triggers tab
page (PTG).