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Chapter 3 Features and Functions
Burst Modulation
Burst Count
The burst count defines the number of cycles to be output per burst.
Used only in the triggered burst mode (internal or external source).
Certain combinations of burst count and carrier frequency are not
allowed. If you attempt to specify a burst count that is not valid,
the function generator will automatically adjust the count to
the maximum value allowed with the present carrier frequency.
Make sure you note the restrictions in "Burst Carrier Frequency" starting
on page 85 before setting the burst count.
• Burst count: 1 to 50,000 cycles, in 1 cycle increments. You can also
select an infinite burst count. The default is 1 cycle.
• When the internal trigger source is selected, the specified number of
cycles is output continuously at a rate determined by the burst rate
setting. The burst rate frequency defines the interval between bursts.
• When the single or external trigger source is selected, the burst count
and burst phase remain in effect but the burst rate is ignored. The
specified number of cycles is output each time
when a trigger signal is applied to the Ext Trig terminal. The function
generator is triggered on the rising edge of a
• When the external gate burst source is selected, the burst count,
burst rate, burst phase, and burst trigger source are ignored
(these parameters are used for the triggered burst mode only).
• Front-Panel Operation:
4: BURST CNT
(MOD MENU)
• Remote Interface Operation:
BM:NCYCles {<
# cycles
Single
pulse.
TTL
>|INFinity|MINimum|MAXimum}
3
is pressed or
87
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