Burst Modulation - HP 33120A User Manual

Chapter 3 Features and Functions

Burst Modulation

Burst Modulation
You can configure the function generator to output a waveform with a
specified number of cycles, called a burst. You can output the burst at a
rate determined by the internal rate generator or an external signal
applied to the rear-panel connector. The function generator can produce
a burst using sine, square, triangle, ramp, and arbitrary waveforms.
For more information on the fundamentals of Burst Modulation,
refer to chapter 7, "Tutorial".
You can use burst modulation in the following two modes. The function
generator enables one burst mode at a time based on the trigger source
and burst source that you select (see the table below).
• Triggered Burst Mode: In this mode, the function generator outputs
a waveform with a 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. You can
configure the function generator to accept an internal trigger or you
can send the trigger externally by pressing the front-panel
or by applying a trigger signal to the rear-panel Ext Trig terminal.
At power-on, the internally-triggered burst mode is enabled.
• External Gated Burst Mode: In this mode, the output waveform is
either "on" or "off " based on the level of the external signal applied to
the rear-panel Ext Trig terminal. When the gate signal is true,
the function generator outputs a continuous waveform. When the
gate signal is false, the output is turned off.
External Triggered Mode
Internal Triggered Mode
External Gated Mode
Trigger Source Burst Source
(TRIG:SOUR) (BM:SOUR)
External Internal
Internal Internal
Internal External
Burst Count Burst Rate
(BM:NCYC) (BM:INT:RATE)
Available Not Used
Available Available
Not Used Not Used
3
key
Single
Burst Phase
(BM:PHAS)
Available
Available
Not Used
81