HP 33120A, User Manual

Page: 73 / 118

Burst Trigger Source
In the triggered burst mode, the function generator outputs a waveform
with the specified number of cycles ( burst count ) each time a trigger is
received. After the specified number of cycles has been output, the
function generator waits for the next trigger while outputting no signal
(zero volts or the dc offset level).
At power-on, the internally-triggered
burst mode is enabled.
•
Trigger source:
Internal
, Single, or External. The default is Internal.
•
In the triggered burst mode, the “burst source” is Internal .
•
When the internal trigger source is selected, the frequency at which
the burst is generated is determined by the burst rate parameter.
The burst rate frequency defines the interval between bursts.
•
Pressing
Single
to enable the single trigger mode also enables the
external trigger mode. External triggering is like the front-panel
single trigger mode except that you apply a trigger signal to the
rear-panel
Ext Trig terminal. The function generator is triggered on
the rising edge of a
TTL
pulse.
•
The
Trig
annunciator turns on when the function generator is waiting
for a single or external trigger.
•
When the single or external trigger source is selected, the burst count
and burst phase remain in effect but the burst rate is ignored.
•
When the external gate source is selected (“gated” burst mode), the
specified trigger source is ignored. The external gated mode overrides
the triggered mode source.
•
Front-Panel Operation : Pressing
Single
to enable the single
trigger mode also enables the external trigger mode.
Press
Shift Internal
to enable the internal trigger mode.
•
Remote Interface Operation :
TRIGger:SOURce {IMMediate|EXTernal|BUS}
See “Triggering” on page 98 for more information.
Chapter 3 Features and Functions
Burst Modulation
82