Window

Configures common properties for window triggering.

A window trigger occurs when a signal enters or leaves a window you specify with high level or low level.

1378

Inputs/Outputs

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trigger coupling

The method used to couple the trigger signal.

AC 0 Couples the trigger signal with an AC current.
DC 1 Couples the trigger signal with a DC current.
HF Reject 3 Couples the trigger signal with a high frequency reject filter.
LF Reject 4 Couples the trigger signal with a low frequency reject filter.
AC Plus HF Reject 1001 Couples the trigger signal with an AC current and a high frequency reject filter.

Default value: DC

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trigger window mode

Specifies whether the trigger should occur when the signal is entering or leaving a window.

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session in

Handle that identifies the NI-SCOPE instrument session as previously allocated by Initialize With Options .

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error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Default value: No error

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trigger source

The source you want the digitizer to monitor for a trigger.

Channel 0 Monitors Channel 0 for a trigger signal.
Channel 1 Monitors Channel 1 for a trigger signal.
Channel 2 Monitors Channel 2 for a trigger signal.
Channel 3 Monitors Channel 3 for a trigger signal.
Channel 4 Monitors Channel 4 for a trigger signal.
Channel 5 Monitors Channel 5 for a trigger signal.
Channel 6 Monitors Channel 6 for a trigger signal.
Channel 7 Monitors Channel 7 for a trigger signal.
External TRIG Monitors an external trigger input for a trigger signal.

Default value: Channel 0

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low level

The voltage threshold for the digitizer to use for low triggering.

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high level

The voltage threshold for the digitizer to use for high triggering.

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trigger holdoff

The length of time the digitizer waits after detecting a trigger before enabling NI-SCOPE to detect another trigger.

Default value: 0.00

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trigger delay

The length of time the digitizer waits after it receives the trigger to start acquiring data.

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session out

Reference to the NI-SCOPE instrument session to pass to the next node in the program.

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Time-Qualified Window Triggering

Window Time Condition Window Time Limit

Trigger System Operation

When you initiate an acquisition, the trigger system operates in the following manner:

  • The digitizer waits for the start trigger, which is configured through the Start Trigger Source property. The default value is immediate.
  • Upon receiving the start trigger, the digitizer begins sampling pretrigger points.
  • After the digitizer finishes sampling pretrigger points, the digitizer waits for a reference (stop) trigger that you specify with an instance of Configure Trigger.
  • Upon receiving the reference trigger and then after completing posttrigger sampling, the digitizer finishes the acquisition.

You specify configuration parameters such as the trigger source and trigger delay with each Configure Trigger instance. Additionally, you can adjust the amount of pretrigger and posttrigger samples using reference position in Configure Horizontal Timing. The default is half the record length.

For multirecord acquisitions, all records after the first record are started based on the setting of the Advance Trigger Source property. The default value is immediate.

Note Some features are not supported by all digitizers.