BNC 645 - Manual (Page 59)

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Use the following commands to configure the Trig Out signal:
OUTPut:TRIGger:SLOPe {POSitive|NEGative}
OUTPut:TRIGger {OFF|ON}
4.13 Burst Operation
Model 645 offers the burst operation to generate the selected type of
waveform with specified number of cycles, called a burst. Bursts may be
triggered internally or manually. Bursts can also be triggered or gated
externally by the signal applied to the Ext Trig / FSK / Burst connector on
the rear panel. Sine, ramp, pulse, square and arbitrary waveforms are
allowed to output in both the triggered and gated burst modes. Noise is
available only in the gated burst mode.
Triggered Burst Mode
This is the default burst mode. Model 645 outputs a waveform with a
specified number of cycles, called burst count, each time it receives a
trigger. When the specified number of cycles is outputted, the waveform
generator pauses and waits for next trigger. One may choose to trigger
the bursts using internal source, to manually press the Trigger button on
the front panel to trigger a burst, to apply an external signal at the Ext
Trig / FSK / Burst
connector on the rear panel, or to send a software
trigger through the remote interface.
External Gated Burst Mode
In gated burst mode, the length of a burst is determined by the voltage
level of the external signal applied at the Ext Trig / FSK / Burst connector
on the rear panel. During the time when the external signal is logic true,
the waveform generator outputs a continuous waveform. When the gate
signal is logic false, the output wave remains at the same voltage level as
the starting burst phase of the selected waveform. The output stops
immediately following a noise burst when the gate signal becomes logic
false.