Table Of Contents

Configure Trigger (Analog » Edge) (G Dataflow)

Last Modified: September 15, 2017

Configures common properties for edge triggering.

When you initiate an acquisition, the digitizer waits for the start trigger, which is configured through the Trigger Source property. The default is immediate. Upon receiving the start trigger, the digitizer begins sampling pre-trigger points. After the digitizer finished sampling pre-trigger points, the digitizer waits for a reference trigger. Upon receiving the reference trigger, the digitizer finishes the acquisition after completing post-trigger sampling.

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Note  
  • You can adjust the amount of pre-trigger and post-trigger samples using reference position of Configure Horizontal Timing. The default is half the record length.
  • Some features are not supported by all digitizers.
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trigger coupling

The method used to couple the trigger signal.

Name Value Description
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: DC

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trigger slope

The trigger edge on which to trigger the digitizer.

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session in

Identifies a particular instrument session.

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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

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

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trigger source

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

Name Description
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: Channel 0

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trigger level

The voltage threshold for the trigger.

Default: 0.00

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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: 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

Passes the instrument handle to the next node in the program. This parameter has the same value as session in.

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error out

error out contains error information. This output provides standard error out functionality.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application


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