Stepped Trigger Mode

NI Signal Generators Help (NI-FGEN 18.1)

Edition Date: April 2018

Part Number: 370524V-01

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The waveform you downloaded generates each time a Start trigger occurs. After a waveform finishes generating, the last sample of the waveform repeats continuously until the next Start trigger is received. When the next Start trigger is received, the waveform generates again. If a Start trigger is received while a waveform is generating, the Start trigger is ignored and another Start trigger is required to regenerate the waveform after the last sample generates. The following table provides more information about waveform generation behavior in Frequency List output mode.

Output Mode Trigger Behavior
Frequency List Mode The device generates the next step in the active frequency list every time a Start trigger occurs. After the duration for a step has elapsed, the signal generation stops and remains at the configured DC offset level until the next Start trigger is received. When the next Start trigger is received, the next step in the frequency list is generated. After the final step, the frequency list repeats until generation is aborted. If the Trigger Source property or the NIFGEN_ATTR_TRIGGER_SOURCE attribute is set to NIFGEN_VAL_IMMEDIATE, the only way to advance to the next step in the frequency list is to call the niFgen Send Software Edge Trigger VI or the niFgen_SendSoftwareEdgeTrigger function.

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