BNC 645 - Manual (Page 129)

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the waveform generator stops while remaining at the voltage level
corresponding to the starting burst phase of the selected waveform. And the
output stops immediately in a noise waveform when the gate signal is false .
-- The burst count, burst period and trigger source are for triggered burst mode
only.
BURSt:MODE?
“TRIG” or “GAT” will be returned.
BURSt:NCYCles {<# cycles>|INFinity|MINimum|MAXimum}
Specify the number of cycles to be output in each burst (triggered burst mode
only). The range is from 1 to 50,000 cycles in 1 cycle increments and the default
is 1 cycle. The maximum value depends on the burst period and frequency as
shown below. Specify Infinite to generate a continuous burst waveform When
using the Immediate(Internal) trigger source
(TRIG:SOUR IMM command), the
burst count must be less than the product of the maximum burst period and the
waveform frequency:
Burst Count < Maximum period x Frequency.
--
The waveform generator will automatically increase the burst period up to its
maximum value to accommodate the specified burst count, but it won’t change
the waveform frequency.
-- The burst count does not apply in the gated mode. However, if you specify a
new burst count while in the gated mode, the waveform generator will
remember it and use it when the triggered mode is selected.
BURSt:NCYCles?
The burst count will be returned. The range is from 1 to 50,000, and 9.9E+37 is
returned if Infinite is specified.
BURSt:INTernal:PERiod {<seconds>|MINimum|MAXimum}
Specify the burst period for bursts with internal (immediate) trigger source. The
burst period is ignored when external or manual trigger source is enabled (or
when the gated burst mode is chosen). The range is from 1 µs to 500 seconds
and the default is 10 ms. The maximum value is 500 s, but the minimum value
depends on the burst count and frequency as shown below: