Burst Trigger Mode

NI Signal Generators Help (NI-FGEN 18.1)

Edition Date: April 2018

Part Number: 370524V-01

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In Burst trigger mode, calling the first Start trigger begins waveform generation. The waveform then generates continually. The following table provides more information about waveform generation behavior in Arbitrary Waveform, Arbitrary Sequence, and Frequency List output modes.

Output Mode Trigger Behavior
Arbitrary Waveform Mode Burst trigger mode operates the same as Continuous trigger mode when the device is operating in Arbitrary Waveform mode.
Arbitrary Sequence Mode Each waveform you define in the sequence list generates continuously until another Start trigger occurs. A Start trigger causes the waveform generation to switch to the waveform defined by the next segment, after the current waveform finishes. After the sequence list is exhausted, the waveform generation returns to the waveform defined by the first segment and subsequent Start triggers will restart the process. Only the first Start trigger which signals a transition to the next segment is recognized, all subsequent Start triggers are ignored until the currently generating waveform finishes.  The transition of one waveform to the next can be made amplitude continuous if waveforms in all segments start and end at the same amplitude. Alternatively, this also can be accomplished by ensuring that the waveforms from one segment to the next end and start at the same amplitude. This amplitude continuous transition is shown in the previous Arbitrary Sequence Mode examples by the transitions of Segments 1 to Segment 2, and Segment 3 to Segment 4. The transition from Segment 2 to Segment 3 shows a discontinuous transition, going from a positive value on the last sample of the ramp waveform right to a midrange value of the sine waveform.

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 elapses, the waveform generates until the next Start trigger is received. When the next Start trigger is received, the next step in the frequency list generates. If a Start trigger is received within the specified duration of the step, the Start trigger is applied after the duration elapses. Any additional Start triggers received within the duration are ignored. 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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