Events Page

Use this page of the Recording Options tab to configure actions that LabVIEW SignalExpress recognizes as events during a data logging operation. You can configure LabVIEW SignalExpress to recognize keystroke or signal-based events.

This page includes the following components:

• Event list—Lists the source and type of events you configure.
• Add—Adds a new event to the Event list.
• Remove—Removes the selected event from the Event list.
• Condition type—Specifies the type of the selected event. You must add an event to the Events list to display this pull-down menu. You can select from the following options:
  • Signal trigger—Triggers an event when a trigger occurs on the Signal you specify. Use the Trigger type field to configure a trigger.
  • Keystroke—Triggers an event when the user presses the key or combination of keys you specify.
• Signal—[Condition type: Signal trigger] Specifies the signal to use to trigger the event.
• Trigger type—[Condition type: Signal trigger] Specifies the behavior of the Signal that triggers an event. You can select from the following options:
  • Rising slope—Triggers an event when the signal crosses the value you specify in the Trigger value field with a positive slope.
  • Falling slope—Triggers an event when the signal crosses the value you specify in the Trigger value field with a negative slope.
  • Entering window—Triggers an event when the signal enters the window between the values you specify in the Higher value and Lower value fields.
  • Leaving window—Triggers an event when the signal leaves the window between the values you specify in the Higher value and Lower value fields.
• Trigger value—[Trigger type: Rising slope, Falling slope] Specifies the value the signal must cross to trigger an event.
• Hysteresis—[Trigger type: Rising slope, Falling slope] Specifies the amount above or below the Trigger value through which the signal must pass before LabVIEW SignalExpress detects the event. You can use Hysteresis to prevent noise from causing a false event trigger. For a Rising slope condition, the signal must pass below Trigger value – Hysteresis before LabVIEW SignalExpress detects the event. For a Falling slope condition, the signal must pass above Trigger value + Hysteresis before LabVIEW SignalExpress detects the event.
• Higher value—[Trigger type: Entering window, Leaving window] Specifies the high limit of the range in which the signal must enter or leave the window to trigger an event.
• Lower value—[Trigger type: Entering window, Leaving window] Specifies the low limit of the range in which the signal must enter or leave the window to trigger an event.
• Key—[Condition type: Keystroke] Specifies the key the user must press to trigger the event.
• Modifier keys—[Condition type: Keystroke] Specifies a key or keys that the user must press in conjunction with Key to trigger the event. You can select any or all of the following options:
  • Alt—Specifies the <Alt> key as a modifier.
  • Ctrl—Specifies the <Ctrl> key as a modifier.
  • Shift—Specifies the <Shift> key as a modifier.
  • Windows—Specifies the <Windows> key as a modifier.
• Annotation—Specifies an annotation to associate with the event. The annotation appears on the graph of the signal on the Data View tab.
• Prompt for annotation text—[Condition type: Keystroke] Specifies to prompt the user to enter an annotation at the time an event occurs.