HP 33120A, User Manual

Page: 74 / 118

Burst Source
In the external gated burst 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.
•
Burst source:
Internal
or External Gate. The default is Internal.
•
When the internal burst source is selected, the external gated mode
is disabled.
•
When the external gate source is selected, the output is enabled or
disabled based on the logic level of the gate signal applied to the
Ext Trig terminal. When the gate signal is true (
TTL
high),
the function generator outputs a continuous waveform. When the
gate signal is false (
TTL
low), the output is turned off (zero volts or
the dc offset level).
•
When the external gate 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).
•
The
Ext
annunciator turns on when the function generator is waiting
for the external gate signal.
•
Front-Panel Operation :
7: BURST SRC (MOD MENU)
•
Remote Interface Operation :
BM:SOURce {INTernal|EXTernal}
3
Chapter 3 Features and Functions
Burst Modulation
83