User manual

3390-900-01 Rev. C / January 2009 Return to Section Topics 5-21
Model 3390 Arbitrary Waveform Generator User’s Manual Section 5: Waveform Output Operations
Burst phase
Burst phase defines the starting phase of a burst. The default is 0º and the range is from -360º to
+360º. You can set the burst phase in degrees from the front panel; however, degrees and radians
are both available through remote interface operation.
For sine, square, and ramp waveforms, 0º is the point at which the waveform crosses zero volt, or
the DC offset, when ascending. For arbitrary waveform, it is the first waveform point specified.
In gated burst mode, when the gate signal turns false, the waveform generator will complete the
current waveform and then stop. At this point, the output will remain at the same voltage level as
the starting burst phase.
Burst count
The burst count represents the number of cycles in each burst and is only applicable in triggered
burst mode. The default burst count is 1 cycle, and the range is from 1 to 50,000 cycles in
single-cycle increments. You can also set an infinite burst count.
Burst Period
The burst period represents the time interval between the start times of two consecutive bursts. It
is only applicable in the internally triggered burst mode. The default burst period is 10 ms and the
range is from 1 μs to 500 seconds.
Waveform frequency
The waveform frequency defines the frequency of the output waveform when trigger signal is logic
true. In triggered mode, the specified number of cycles is delivered at the waveform frequency. In
gated mode, the waveform frequency is delivered when the external gate signal is logic true.
The default waveform frequency is 1 kHz. The range is from 1 μHz to 200 kHz for ramp; 1 μHz to
25 MHz for square; 1 μHz to 10 MHz for pulse and arbitrary; and 1 μHz to 50 MHz for sine
waveforms. The minimum frequency is 2.001 mHz for internally triggered burst mode. For sine and
square waveforms, frequencies greater than 10 MHz are permitted only when an infinite burst
count is set.
Trigger source
Trigger source can be internal, external or manual.
The trigger sources perform as follows:
•Internal trigger source: Internal trigger source delivers bursts repeatedly at a rate
determined by the specified burst period, which represents the time interval between the
start times of two consecutive bursts. The burst count must be less than the product of the
burst period and the waveform frequency:
Burst Count < Burst Period x Waveform Frequency
NOTE If a new burst count is specified when the instrument is in gated mode, the
instrument will store the new count and implement it when a triggered mode
is selected.